25 080 Drawing Set 9 3.pdf

A

FE

100 EAST JACKSON STREET

SPRINGFIELD, ILLINOIS 62756

ARCHITECT:

GENERAL NOTES

1. CONTRACTOR SHALL VERIFY ALL DIMENSIONS IN THE FIELD

AND SHALL NOTIFY THE ARCHITECT OF ANY DISCREPANCIES.

ALL WORK REQUIRING MEASURING SHALL BE DONE

ACCORDING TO FIGURES ON THE DRAWINGS AND NOT

SCALED FROM DRAWINGS. THE ARCHITECT WILL FURNISH

ANY ADDITIONAL DIMENSIONS UPON REQUEST.

2. ALL WORK SHALL CONFORM TO PREVAILING CODE,

ORDINANCES, AND REQUIREMENTS.

3. CONTRACTOR SHALL BE RESPONSIBLE TO OBTAIN ALL

PERMITS AND INSPECTIONS REQUIRED FOR THEIR WORK AND

SHALL PAY ALL APPLICABLE FEES.

4. CONTRACTOR SHALL PROVIDE OWNER WITH WRITTEN ONE (1)

YEAR GUARANTEE COVERING ALL LABOR AND MATERIALS

FURNISHED AND INSTALLED AS PART OF THIS PROJECT.

GUARANTEE SHALL COMMENCE FROM THE DATE OF

SUBSTANTIAL COMPLETION.

5. CONTRACTOR SHALL COMPLY WITH ALL PREVAILING O.S.H.A.

REQUIREMENTS.

6. FOR BIDDING PURPOSES, CONTRACTOR SHALL ASSUME THAT

ACCESS TO THE PENTHOUSE IS THROUGH THE 7'x12' TRAP

DOOR IN THE FLOOR AT THE NORTH END OF THE PENTHOUSE

SERVED BY THE FREIGHT ELEVATOR RATED AT 2500# WITH

DIMENSIONS OF 4'x7'x8', THE ROOFTOP MAN DOOR, THE

EXISTING OPENING ADJACENT TO THE MAN DOOR, THE

INTERIOR MAN DOOR AT THE FOOT OF EXISTING STAIRWELL,

OR THROUGH REMOVAL OF A 7'x12' LOUVERED PANEL AND

INSULATION ON THE NORTH END OF THE PENTHOUSE WALL.

INDEX OF DRAWINGS

SYMBOL LEGEND

G-1 COVER SHEET

S-1 STRUCTURAL PLAN & NOTES

DHV-1 HVAC DEMOLITION PLAN

HV-1 HVAC PLAN

HV-2 STEAM PLAN

HV-3 CHILLED WATER PLAN

E-1 ELECTRICAL PLAN

E-2 DHU CONTROL SCHEMATIC

E-3 DHU CONTROL SCHEMATIC

ROOM NAME AND NUMBER

DOOR NUMBER

BUILDING SECTION

DETAIL TAG

WALL TYPE

SEMI-RECESSED

FIRE EXTINGUISHER

ARROW INDICATES DIRECTION

SECTION IS DRAWN

DETAIL NUMBER

SHEET NUMBER WHERE DRAWN

DETAIL NUMBER

SHEET NUMBER WHERE DRAWN

INDICATES DIRECTION

DETAIL IS DRAWN

HVAC UPGRADES 26.10

ARCHIVE BUILDING

BUILDING DESIGN CRITERIA

ALL WORK SHALL BE CONSTRUCTED IN ACCORD WITH:

2018 INTERNATIONAL BUILDING CODE

2018 INTERNATIONAL MECHANICAL CODE

2018 INTERNATIONAL FUEL GAS CODE

2018 INTERNATIONAL FIRE CODE

2021 INTERNATIONAL ENERGY CONSERVATION CODE

2018 ILLINOIS ACCESSIBILITY CODE

2015 NFPA 101 LIFE SAFETY CODE

2014 ILLINOIS STATE PLUMBING CODE

2017 NATIONAL ELECTRICAL CODE

ABBREVIATIONS

A.D.A.

A.F.F.

ALUM.

CLG.

CONC.

CONT.

CPT.

DIA.

DN.

EA.

EL.

ELEC.

FL.

FIN.

GA.

G.B. or GYP. BD.

HT.

MANUF.

MAT'L

AT

AMERICANS WITH DISABILITIES ACT

ABOVE FINISH FLOOR

ALUMINUM

CEILING

CONCRETE

CONTINUOUS

CARPET

DIAMETER

DOWN

EACH

ELEVATION

ELECTRICAL

FLOOR

FINISH

GALVANIZED

GYPSUM BOARD

HEIGHT

MANUFACTURER or MANUFACTURED

MATERIAL

MAX.

MIN.

N.I.C.

O.C.

PLAM.

PT.

PREFIN.

REQ'D.

S.A.T.

S.F.

SHT.

S.S.

STL.

SUSP.

TEMP.

TYP.

U.N.O.

V.

VERT.

WD.

MAXIMUM

MINIMUM or MINUTE

NOT-IN-CONTRACT

ON-CENTER

PLASTIC LAMINATE

PAINT

PREFINISHED

REQUIRED

SUSPENDED ACOUSTICAL TILE

SQUARE FEET

SHEET

STAINLESS STEEL

STEEL

SUSPENDED

TEMPERED

TYPICAL

UNLESS NOTED OTHERWISE

VOLT

VERTICAL

WOOD G-1

KDE

1630 South Sixth Street Springfield, Illinois 62703 Phone 217.789.7011

© Evan Lloyd Associates, Inc.

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Revised:

Revised:

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OF SHEETS.

Date Signed:

Expiration Date:

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HVAC EQUIPMENT LIST

DESCRIPTIONTAG QTY

DA-1 1GREENHECK VCD-42 CONTROL DAMPER W

BELIMO AFBUP-S

DA-2A &

DA-SB

2GREENHECK VCD-42 CONTROL DAMPER W

BELIMO AFBUP-S

DHU-2 1CLIMATE BY DESIGN CDI-154-8.0-SF7SLOR

DEHUMIDIFICATION AIR HANDLING UNIT

HX-1 1BELL & GOSSETT GPX HEAT EXCHANGER

AP86 P/N:BY5433

CH-1 1DAIKIN AGZ006F 69 TON PACKAGE

CHILLER

STEAM EQUIPMENT LIST

DESCRIPTIONTAG QTY

APT-1 1SPIRAX SARCO APT10-4.5 AUTOMATIC

PUMP TRAP

DSP-1 1DRISTEAM ULTRASORB MP

STS-1 1DRISTEAM STEAM TO STEAM HUMIDIFIER

STS-400C

ELECTRICAL EQUIPMENT LIST

DESCRIPTIONTAG QTY

BP-1 1SQUARE D 400A MLO I-LINE

PANELBOARD HC3248DB9/HCM48TS

CP-1 1DHU CONTROL PANEL (SEE DETAIL SHEET

E-2)

NOTE: ALL REQUIRED STEAM TRAPS (UNLESS OTHERWISE

SPECIFIED), VALVES AND ACCESSORIES ARE TO BE SOURCED

AND PROVIDED BY THE INSTALLING CONTRACTOR. MATCH

EXISTING INSTALLED EQUIPMENT OR APPROVED EQUAL.

AutoCAD SHX Text

AutoCAD SHX Text A-

AutoCAD SHX Text

NAME

AutoCAD SHX Text

AutoCAD SHX Text

AutoCAD SHX Text A-

AutoCAD SHX Text

S-1

© Evan Lloyd Associates, Inc.

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Revised:

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OF SHEETS.

Date Signed:

Expiration Date:

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DHV-1

KDE

SCALE: 14" = 1'-0"

EXISTING ROOF/PENTHOUSE HVAC DEMOLITION PLAN

NORTH

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Drawn By:

Revised:

Revised:

Project No.

SHEET

OF SHEETS.

Date Signed:

Expiration Date:

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REMOVE 60 TON "YORK CHILLER" INCLUDING ALL RELATED

REFRIGERANT PIPING. CONTRACTOR TO ENSURE ALL

REFRIGERANT IS LEGALLY EVACUATED & DISPOSED.

REMOVE 30 TON "DES CHAMP CONDENSER" INCLUDING

ALL RELATED REFRIGERANT PIPING. CONTRACTOR TO

ENSURE ALL REFRIGERANT IS LEGALLY EVACUATED &

DISPOSED.

REMOVE OUTDOOR

FRESH AIR UNIT.

REMOVE REFRIGERANT/CHILLER BUNDLE, INCLUDING ALL RELATED REFRIGERANT

PIPING. THE CHILLED WATER SUPPLY AND RETURNED PIPING SHALL REMAIN.

CWRCWS

EXISTING CHILLED WATER SUPPLY &

RETURN PIPING SHALL REMAIN.

REMOVE & SALVAGE "I" BEAM.

RE-INSTALL UNDER THE NEW UNIT

(TYPICAL OF 2 LOCATIONS).

LPSSLPSS

REMOVE FILTER

SECTION & DUCTWORK.

TRAPEZE HANGER TO BE

REUSED (TYP.)

HVAC SYMBOLS LIST

STEAM SUPPLY PIPE TO REMAIN.SS

STEAM CONDENSATE RETURN PIPE TO REMAIN.SCR

CHILLED WATER SUPPLY PIPE TO REMAIN.CWS

CHILLED WATER RETURN PIPE TO REMAIN.CWR

PENTHOUSE

ROOF

ROOF

D

LPSR

DRAIN PIPE TO REMAIN.D

LPSR

CAP EXIST. STEAM

CONDENSATE RETURN PIPING.

SCR

SC

R

STEAM SUPPLY PIPE TO BE REMOVED.SS

STEAM CONDENSATE RETURN PIPE TO BE REMOVED.SCR

REMOVE PORTIONS OF DUCTWORK

& STEAM PIPING AS SHOWN.

EXISTING

CONCRETE

PADS.

PENTHOUSE

D

LPSR

REMOVE DUCTWORK SECTION. RELOCATE

TRANSITION (SEE SHEET HV-1).

FABRICATE & INSTALL SHEET METAL

BLANKING PLATE AFTER REMOVING

DUCTWORK

HV-1

SCALE: 14" = 1'-0"

PARTIAL ROOF/PENTHOUSE HVAC PLAN

NORTH

© Evan Lloyd Associates, Inc.

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001-017445

Date:

Drawn By:

Revised:

Revised:

Project No.

SHEET

OF SHEETS.

Date Signed:

Expiration Date:

S ou th Si xth S tre et

Sp rin gfi eld

, Il lin ois

Ph on e

7.7

.70

HV

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EQUIPMENT SUPPORT

FRAME TO REMAIN.

HVAC SYMBOLS LIST

CHILLED WATER SUPPLY PIPECWS

CHILLED WATER RETURN PIPECWR

NEW COPPER DRAIN PIPE

NEW 30"X30" DUCTWORK

W/ 1" DUCT LINER.

DN.

INSTALL "DHU-2."

EXISTING COPPER DRAIN PIPEED

NEW EQUIPMENT SUPPORT RAILS

(SEE SHEET S-1).

INSTALL DAMPERS

"DA-2A" & "DA-2B"

30"X48"

REINSTALL SALVAGED

DUCT TRANSITION

"DHU-1"

INSTALL DAMPER "DA-1"

FLASH AND CAULK ALL

WALL PENETRATIONS

(MATCH EXISTING)

APPROX. DRAIN LOCATIONS (3)

INSTALL CHILLER "CH-1"

NEW 12"x48" TO 30"X30"

DUCT TRANSITION

INSULATE DUCT PER

SPECIFICATIONS

NEW 30"X30" DUCT W/

1" DUCT LINER

"APT-1" (SEE SHEET HV-2)

"STS-1" (SEE SHEET HV-2)

G

PS

G

TS

PS

G

G

PS

G

HV-2

KDE

SCALE: 12" = 1'-0"

PARTIAL ROOF/PENTHOUSE STEAM PLAN

NORTH

© Evan Lloyd Associates, Inc.

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001-017445

Date:

Drawn By:

Revised:

Revised:

Project No.

SHEET

OF SHEETS.

Date Signed:

Expiration Date:

S ou th Si xth S tre et

Sp rin gfi eld

, Il lin ois

Ph on e

7.7

.70

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HVAC SYMBOLS LIST

LPCR

HIGH PRESSURE STEAM SUPPLYHPSS

HIGH PRESSURE CONDENSATE RETURNHPCR

COPPER DRAIN PIPED

LOW PRESSURE CONDENSATE RETURN

ROUTE PIPE INSIDE PENTHOUSE UP TO PIPE RACK ON SOUTH WALL.

FOLLOW EXISTING PIPING TO HPS CONNECTION AT "DHU-1" STEAM HEADER.HPS

EXTEND WATER LINE TO

NEW STS HUMIDIFIER

1"

SCALE: N.T.S.

STEAM REACTIVATION CONDENSATE PIPING LAYOUT2

LPCRLPCR

HPCR

HPS

SCALE: N.T.S.

HIGH PRESSURE STEAM SUPPLY DETAIL3

HPSS

TO

D

HU

-2

TO

D

HU

-2

TO APT-1

EXISTING ROOF

EXISTING PENTHOUSE

"DHU-2"

TO STEAM

HEADER

EXISTING PENTHOUSE

HPCR

EXISTING ROOF

NEW 1" SCH80 300 WPS

NEW 2" SCH80 300 WPS

DN.

LPSS LOW PRESSURE STEAM SUPPLY

OPEN SITE DRAIN PIPEOSDP

LP

SS

LPSS

OSDP

EXIST. HUB DRAIN

D

D

2"

PROVIDE HEAT TRACE & INSULATE

EXTERIOR PIPING PER SPECIFICATIONS.

ALL ROOFTOP EQUIPMENT TO BE

INSTALLED TO MAINTAIN

MAXIMUM CLEARANCE FOR

ACCESS DOOR

HVAC NOTES

1. ALL STEAM PIPING SHALL BE SCH80, ALL FITTINGS 300WPS

2. ALL NON-STEAM CONDENSATE PIPING SHALL BE TYPE K COPPER

3. ALL TREATED WATER LINES SHALL BE SCH40 PVC

4. ALL NON-STEAM CONDENSATE PIPING SHALL BE TYPE K COPPER

1"

LP

CR

TO STEAM

HEADER

2"

LPSS

2"

HV-2

INSTALL DRISTEEM MP

DISPERSION PANEL "DSP-1"

INSTALL "STS-1"

CONNECT CONDENSATE

TO CONDENSATE RETURN

(ORANGE PIPE).

SEE DETAIL 2/HV-2

FABRICATE & INSTALL 18GA

S/S CONTAINMENT PAN. PIPE

TO OPEN SITE DRAIN LINE.

4"

LPCR

HPS

INSTALL "APT-1"

TO STEAM

HEADER

HPCR

1"

LP

SS

CONNECT

TO 1" LPSS

LPSS

1"

LP

CR D

TO STEAM

HEADER

SCALE: 1" = 1'-0"

PARTIAL ROOF/PENTHOUSE ENLARGED STEAM PLAN1

1"

INSIDE BUILDING

WALL

EXIST. 1" PVC WATER LINE

TEMPERATURE SENDERTS

GAUGEG

PRESSURE SENDERPS

TSG

G G

G

TSTS

TS

T

TSG

G G

G

TSTS

TS

HV-3

KDE

SCALE: 14" = 1'-0"

PARTIAL ROOF/PENTHOUSE CHILLED WATER PLAN

NORTH

© Evan Lloyd Associates, Inc.

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001-017445

Date:

Drawn By:

Revised:

Revised:

Project No.

SHEET

OF SHEETS.

Date Signed:

Expiration Date:

S ou th Si xth S tre et

Sp rin gfi eld

, Il lin ois

Ph on e

7.7

.70

HV

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CWR

CWS

EQUIPMENT SUPPORT FRAME

TO REMAIN. NEW LOCATION

OF THE SALVAGED "I" BEAM.

EXIST. TRAPEZE HANGER (TYP.)

HVAC SYMBOLS LIST

CHILLED WATER SUPPLY PIPECWS

CHILLED WATER RETURN PIPECWR

NEW COPPER DRAIN PIPE

ESCR

ESCRINSTALL GLYCOL TO CHILLED WATER HEAT EXCHANGER CONNECT

TO CHILLED WATER SUPPLY AND RETURN PIPING. (INSTALLING

CONTRACTOR TO VERIFY ALL PIPE SIZES AND CONNECTIONS.)

D

D

INSTALL "CH-1." CHILLER MUST

MOUNT TO EXISTING EQUIPMENT

RAILS (CONTRACTOR

RESPONSIBLE FOR PROVIDING

ATTACHMENT POINTS.) PROVIDE

NEW GLYCOL LINES FROM

CHILLER TO HEAT EXCHANGER

PIPING 3.0" OR AS REQUIRED

BY MANUFACTURER.

COPPER DRAIN PIPED

3" 3"

SCALE: N.T.S.

CHILLED WATER DETAIL2

GL

YC

OL

RE

TUR

N

CH

ILL

ED

WA

TER

RE

TUR

N

CH

ILL

ED

WA

TER

SU

PP

LY

GL

YC

OL

SU

PP

LY

INSTALL GLYCOL PIPING

ON PIPE RACKS

FLASH AND CAULK ALL

WALL PENETRATIONS

(MATCH EXISTING)

NEW 1.5" CLOSE CELL ELASTOMERIC

INSULATION (ARMAFLEX OR EQUAL)

INSTALL "HX-1"

PROVIDE SYSTEM LOW POINT

DRAINVALVES W/ HOSE CONNECTIONS

FOR GLYCOL & CHILL WATER SYSTEMS

INSULATE EXTERIOR PIPING W/ 2" CLOSE CELL

ELASTOMERIC INSULATION W/ 0.024" ALUM.

CLADDING MIN. (ARMAFLEX OR EQUAL)

CUT & MAKE FIELD CONNECTION "DHU-2"

COIL CONDENSATE TO DRAIN

THROUGH OSDP.

PROVIDE SYSTEM HIGH POINT VALVES & HOSE

CONNECTIONS FOR FILLING & DRAINING GLYCOL PIPING

GLYCOL SUPPLYGS

GLYCOL RETURNGR

DRAIN PAN TIE IN TO OSDP

DHU2

GR GS

OSDP

HV-3

SCALE: 34" = 1'-0"

PARTIAL PENTHOUSE ENLARGED CHILLED WATER PLAN1

CWR

CWS

INSTALL

"HX-1"

TEMPERATURE SENDERTS

GAUGEG

J

E-1

KDE

SCALE: 14" = 1'-0"

PARTIAL ROOF/PENTHOUSE ELECTRICAL PLAN

NORTH

© Evan Lloyd Associates, Inc.

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TIMOTHY

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001-017445

Date:

Drawn By:

Revised:

Revised:

Project No.

SHEET

OF SHEETS.

Date Signed:

Expiration Date:

S ou th Si xth S tre et

Sp rin gfi eld

, Il lin ois

Ph on e

7.7

.70

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ELECTRICAL SYMBOLS LIST

FMC

CONDUIT

INSTALL 4"x4"

JUNCTION BOX

"DHU-2"

"DA-2A" & "DA-2B"

"DHU-1"

"DA-1"

FLASH AND CAULK ALL

WALL PENETRATIONS

(MATCH EXISTING)

CONNECT TO PANEL DP. USE EXISTING BREAKER CH-1 (150A)

1.5"- 3 - 2/0 AWG COPPER THHN

1 - #6 AWG COPPER THHN

FLASH AND CAULK ALL

WALL PENETRATIONS

(MATCH EXISTING)

CONNECT TO AVAILABLE

120V/1P 20A BREAKER IN

PANEL "NPH"

REMOVE CONDUCTORS. EXTEND CONDUIT TO "BP-1"

& INSTALL 3-500 MCMCU & 1-#1 AWG CU THHN FROM

SWITCHGEAR IN BASEMENT TO BP-1

CONNECT EQUIPMENT IN ACCORD W/

MANUFACTURER'S SPECIFICATIONS

2"- 4 - 4/0 AWG COPPER THHN

"BP-1"

NEW 24x24 JUNCTION BOX

12"

12"12"

12"

INSTALL 4"x4" JUNCTION BOX

NOTES

1. ALL INTERIOR CONDUIT SHALL BE EMT.

2. ALL EXTERIOR CONDUIT SHALL BE GALVANIZED RMT.

3. ALL INTERIOR FLEXIBLE CONDUIT SHALL BE ALUMINUM FMC.

4. ELECTRICAL CONTRACTOR TO FABRICATE EQUIP. CP-1 PER

SPECIFICATION (SEE SHEET E-2).

5. ALL EXTERIOR WALL PENETRATIONS SHALL BE FLASHED

AND CAULKED.

EXIST. OUTLET

JUNCTION BOX

1"

INSTALL

"CP-1"

1/2"

INSTALL 12" CONDUIT TO CONNECT HEAT TRACE

TO EXIST. 110V AT JUNCTION BOX

FLASH AND CAULK ALL WALL

PENETRATIONS (MATCH EXISTING)

RECONNECT BACNET

COMMUNICATION CABLE,

INTEGRATE NEW CHILLER

INTO THE SCHNEIDER

ECOSTRUCTURE

OPERATING SYSTEM

INCLUDING REMOTE

STOP/START. INSTALL NEW

CONDUIT AND WIRE AS

REQUIRED, (MATCH

EXISTING.)

"STS-1"

CONNECT BACNET

COMMUNICATION CABLE,

INTEGRATE DHU-2 INTO THE

SCHNEIDER

ECOSTRUCTURE

OPERATING SYSTEM

DHU-1 / DHU-2 LEAD-LAG MANUAL SELECTOR - CONTROL SCHEMATIC

Elementary (ladder) diagram - hardwired relay logic, 3-position maintained selector switch, mechanical + electrical interlock

CONTROL PWR

FU1 2A L2 (NEUTRAL / COMMON)

L1 (fused, hot) L2

S1 (1-2)

DHU-1 SELECT

CR2 (21-22)

INTERLOCK N.C.

CR1

CR1 - DHU-1 ENABLE RELAY

(energized = DHU-1 selected as running/lead unit)

S1 (3-4)

DHU-2 SELECT

CR1 (21-22)

INTERLOCK N.C.

CR2

CR2 - DHU-2 ENABLE RELAY

(energized = DHU-2 selected as running/lead unit)

CR1 (13-14) N.O.

PL1 - "DHU-1 LEAD ENABLED" (amber)

CR2 (13-14) N.O.

PL2 - "DHU-2 LEAD ENABLED" (amber)

SELECTOR SWITCH S1 - POSITION / TRUTH TABLE

S1 1-2 S1 3-4 CR1 CR2 DHU-1 / DHU-2

1 - DHU-1 LEAD CLOSED open ENERGIZED de-energ. ENABLED / disabled 2 - OFF (center) open open de-energ. de-energ. disabled / disabled 3 - DHU-2 LEAD open CLOSED de-energ. ENERGIZED disabled / ENABLED (both, service)

LEGEND

N.O. contact N.C. contact

Relay coil (CR) Pilot light (PL) Fuse Field terminal (TB)

Field wiring (dashed) S1 = 3-pos. maintained selector switch (oper. handle, see BOM)

ENABLE CIRCUITS TO DHU CONTROLLERS - ISOLATED (DRY) CONTACTS, NOT REFERENCED TO L1/L2

CR1 (23-24) N.O.

DHU-1 CONTROLLER

TB-__ : REMOTE ENABLE / RUN-PERMISSIVE INPUT

(verify terminal ID against unit IOM)

CR2 (23-24) N.O.

DHU-2 CONTROLLER

TB-__ : REMOTE ENABLE / RUN-PERMISSIVE INPUT

(verify terminal ID against unit IOM)

TB1 terminal block, DHU-1 leg (1,2)

TB1 terminal block, DHU-2 leg (3,4)

120VAC (1∅)

true lockout -both de-energized

ENGINEERING NOTES

BILL OF MATERIALS (typical / or-equal)

S1 - 3-pos. maintained selector switch, 2 N.O. contact blocks CR1, CR2 - ice-cube control relays, DPDT, w/ 8-pin socket PL1, PL2 - 22mm pilot lights, amber, LED, matching ctrl volt.

FU1 - control-circuit fuse + holder, sized per NEC/transformer VA TB1 - terminal block, 600V rated, min. 4 poles (expand as needed) Enclosure - NEMA 1/12 per install location; coordinate w/ panel schedule Sq. D 9001K / A-B 800H / IDEC AL6M or equal IDEC RH2B-U / Omron MY2N or equal Sq. D 9001K / A-B 800H or equal

E-2

KDE

© Evan Lloyd Associates, Inc.

TC

S

E

CRADE

ION

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TIMOTHY

B. SMITH

L

SNE

IC

S

TIH

F

TE

O ILIL

001-017445

Date:

Drawn By:

Revised:

Revised:

Project No.

SHEET

OF SHEETS.

Date Signed:

Expiration Date:

S ou th Si xth S tre et

Sp rin gfi eld

, Il lin ois

Ph on e

7.7

.70

HV

AC

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PG

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AUG. 27, 2026

25080

AUG. 27, 2026

NOV. 30, 2026

1. Mechanical interlock is inherent to S1 (only one contact block made per position); CR1/CR2 N.C. contacts add a hard-wired electrical interlock so DHU-1 and DHU-2 can never be commanded enabled simultaneously, even on switch contact wear/bounce.

2. Center position (2 - OFF) is a true lockout: both enable relays de-energized. Recommended position for LOTO during DHU service.

3. This circuit is manual, non-alternating lead-lag; switching is a deliberate operator action at S1 - no auto-alternation/failover.

4. Confirm CR1/CR2 contact rating vs. DHU controller enable-input spec (voltage/current); use gold-flash "ice-cube" relays for low- energy/Class-2 digital inputs. If DHU enable inputs accept panel control voltage directly, S1 may feed them without CR1/CR2 (simplified alternate - omits pilot-light and interlock functions shown above).

AutoCAD SHX Text Position

AutoCAD SHX Text

DHU-1/DHU-2 DAMPER CONTROL - POSITION & PROVEN-OPEN INTERLOCK DETAIL

AutoCAD SHX Text Bellimo NFB24-SR-S 24VAC spring-return actuators, slaved to DWG E-DHU-LL-001 CR1/CR2 lead-lag state

AutoCAD SHX Text DHU-2 has two actuators (DA-2A/DA-2B, "pair of pants" duct split) which operate together

AutoCAD SHX Text

24VAC DAMPER ACTUATOR POWER SOURCE

AutoCAD SHX Text

FROM L1 (E-DHU-LL-001,

AutoCAD SHX Text post-FU1, 120VAC)

AutoCAD SHX Text

FU2 0.5A

AutoCAD SHX Text to T2 primary (H1)

AutoCAD SHX Text H1

AutoCAD SHX Text FROM L2 (E-DHU-LL-001, common)

AutoCAD SHX Text to T2 primary (H2)

AutoCAD SHX Text H2

AutoCAD SHX Text T2

AutoCAD SHX Text 120-24V, 20VA (see Note 4)

AutoCAD SHX Text X1

AutoCAD SHX Text X2

AutoCAD SHX Text

FU3 1.5A

AutoCAD SHX Text bond to equip.

AutoCAD SHX Text gnd bus, one pt.

AutoCAD SHX Text only (NEC 250.20)

AutoCAD SHX Text

24V HOT

AutoCAD SHX Text

24V COMMON

AutoCAD SHX Text

DHU-1 DAMPER ACTUATOR (DA-1)

AutoCAD SHX Text

CR1 (33-34) N.O.

AutoCAD SHX Text (4th pole, energized when

AutoCAD SHX Text DHU-1 selected as lead)

AutoCAD SHX Text

DA-1

AutoCAD SHX Text Belimo nfb24-SR-S

AutoCAD SHX Text 24VAC spring-return

AutoCAD SHX Text "1" (24V hot)

AutoCAD SHX Text "Y" (ref)

AutoCAD SHX Text "2" (24V com)

AutoCAD SHX Text integral SPDT aux sw. = POS-1

AutoCAD SHX Text POS-1 - DHU-1 damper proven-open switch (integral to DA-1)

AutoCAD SHX Text Factory SPDT aux switch, field-adjusted (0-95° range) to actuate at full-open

AutoCAD SHX Text Wired back to E-DHU-LL-001 field-wiring row A (in series w/ CR1 23-24)

AutoCAD SHX Text

DHU-2 DAMPER ACTUATORS (DA-2A / DA-2B)

AutoCAD SHX Text

CR2 (33-34) N.O.

AutoCAD SHX Text (4th pole, DHU-2 lead -

AutoCAD SHX Text feeds DA-2A/DA-2B, Note 5)

AutoCAD SHX Text

DA-2A

AutoCAD SHX Text Belimo NFB24-SR-S

AutoCAD SHX Text 24VAC spring-return

AutoCAD SHX Text "1" (24V hot)

AutoCAD SHX Text "2" (24V com)

AutoCAD SHX Text integral SPDT aux sw. = POS-2A

AutoCAD SHX Text

DA-2B

AutoCAD SHX Text Belimo NFB24-SR-S

AutoCAD SHX Text 24VAC spring-return

AutoCAD SHX Text "1" (24V hot)

AutoCAD SHX Text "2" (24V com)

AutoCAD SHX Text integral SPDT aux sw. = POS-2B

AutoCAD SHX Text POS-2A / POS-2B - DHU-2 damper proven-open switches (integral to DA-2A/DA-2B)

AutoCAD SHX Text Both field-adjusted to actuate at full-open, wired IN SERIES (2-of-2 proof - either damper not fully

AutoCAD SHX Text open blocks the DHU-2 enable). Series pair wired back to E-DHU-LL-001 row B (in series w/ CR2 23-24)

AutoCAD SHX Text

DAMPER SEQUENCE - SLAVED TO S1/CR1/CR2 LEAD-LAG STATE (E-DHU-LL-001)

AutoCAD SHX Text S1 position

AutoCAD SHX Text

CR1 / CR2

AutoCAD SHX Text

DA-1 (DHU-1)

AutoCAD SHX Text

DA-2A+2B (DHU-2)

AutoCAD SHX Text

1 - DHU-1 LEAD

AutoCAD SHX Text CR1 energ. / CR2 de-energ.

AutoCAD SHX Text powered, drives OPEN

AutoCAD SHX Text unpowered, spring CLOSED

AutoCAD SHX Text 2 - OFF (center)

AutoCAD SHX Text CR1 / CR2 both de-energ.

AutoCAD SHX Text unpowered, spring CLOSED

AutoCAD SHX Text unpowered, spring CLOSED

AutoCAD SHX Text

3 - DHU-2 LEAD

AutoCAD SHX Text CR2 energ. / CR1 de-energ.

AutoCAD SHX Text unpowered, spring CLOSED

AutoCAD SHX Text BOTH powered, drive OPEN

AutoCAD SHX Text

FAIL-SAFE BEHAVIOR

AutoCAD SHX Text Total control/24VAC power loss (T1 or T2 failure) de-energizes

AutoCAD SHX Text ALL actuators - all dampers spring-return CLOSED (<20s). No open-

AutoCAD SHX Text damper / no-airflow-path failure mode possible from a power loss.

AutoCAD SHX Text CR1/CR2 electrical + S1 mechanical interlock (E-DHU-LL-001)

AutoCAD SHX Text also prevent both DHU dampers commanded open simultaneously.

AutoCAD SHX Text

ENGINEERING NOTE:

AutoCAD SHX Text POS-1 (DA-1) and the POS-2A/POS-2B series pair (DA-2A/DA-2B) are each actuators' integral SPDT aux switch (1mA-3A, AutoCAD SHX Text DC5V-AC250V, field-adjustable over 0-95° of travel), inserted in series with the CR1(23-24)/CR2(23-24) dry contacts on

AutoCAD SHX Text DWG E-DHU-LL-001 - a DHU cannot be enabled unless selected as lead AND its damper(s) are proven fully open.

AutoCAD SHX Text BOM ADDITIONS (typical / or-equal)

AutoCAD SHX Text T2 - 120-24VAC transformer, 20VA

AutoCAD SHX Text FU2, FU3 - fuses + holders, sized per Note 4

AutoCAD SHX Text DA-1 - Belimo LF24-SR-S (1x), w/ integral aux sw.

AutoCAD SHX Text DA-2A, DA-2B - Belimo NFB24-SR-S (2x, pair-of-pants)

AutoCAD SHX Text POS-1, POS-2A, POS-2B - integral to DA-1/2A/2B

AutoCAD SHX Text (factory aux switch, no separate part - field-adjust)

AutoCAD SHX Text REF1 - adj. 0-12Vdc reference source, 24VAC powered

(shop-built divider or purpose-built DIN signal module)

E-3

© Evan Lloyd Associates, Inc.

TC

S

E

CRADE

ION

AT

TIMOTHY

B. SMITH

L

SNE

IC

S

TIH

F

TE

O ILIL

001-017445

Date:

Drawn By:

Revised:

Revised:

Project No.

SHEET

OF SHEETS.

Date Signed:

Expiration Date:

S ou th Si xth S tre et

Sp rin gfi eld

, Il lin ois

Ph on e

7.7

.70

HV

AC

U

PG

RA

DE

S

.10

AR

CH

IV

E

BU

IL

TO

L C

OM

PL

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SP

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AUG. 27, 2026

25080

AUG. 27, 2026

NOV. 30, 2026

AutoCAD SHX Text

DHU-1 / DHU-2 LEAD-LAG MANUAL SELECTOR - CONTROL SCHEMATIC

AutoCAD SHX Text Elementary (ladder) diagram - hardwired relay logic, 3-position maintained, keyed selector switch, mechanical + electrical + damper-position interlock

AutoCAD SHX Text

CONTROL PWR

AutoCAD SHX Text

120VAC (1-PH)

AutoCAD SHX Text (see DWG E-DHU-LL-002

AutoCAD SHX Text for CPT source detail)

AutoCAD SHX Text

FU1 2A

AutoCAD SHX Text

L2 (NEUTRAL / COMMON)

AutoCAD SHX Text

AutoCAD SHX Text S1 (1-2)

AutoCAD SHX Text

DHU-1 SELECT

AutoCAD SHX Text

CR2 (21-22)

AutoCAD SHX Text

INTERLOCK N.C.

AutoCAD SHX Text TR1 (timed)

AutoCAD SHX Text (shared, see rung 3)

AutoCAD SHX Text

POS-2 CLOSED

AutoCAD SHX Text (A+B series - row C)

AutoCAD SHX Text

CR1

AutoCAD SHX Text

CR1 - DHU-1 ENABLE RELAY

AutoCAD SHX Text (energized = DHU-1 selected as running/lead unit, AutoCAD SHX Text TR1 spin-down delay has timed out, AND DHU-2's

AutoCAD SHX Text damper(s) proven CLOSED - see Notes 6 & 7)

AutoCAD SHX Text

AutoCAD SHX Text S1 (3-4)

AutoCAD SHX Text

DHU-2 SELECT

AutoCAD SHX Text

CR1 (21-22)

AutoCAD SHX Text

INTERLOCK N.C.

AutoCAD SHX Text TR1 (timed)

AutoCAD SHX Text (shared, see rung 3)

AutoCAD SHX Text

POS-1 CLOSED

AutoCAD SHX Text (row D)

AutoCAD SHX Text

CR2

AutoCAD SHX Text

CR2 - DHU-2 ENABLE RELAY

AutoCAD SHX Text (energized = DHU-2 selected as running/lead unit, AutoCAD SHX Text TR1 spin-down delay has timed out, AND DHU-1's

AutoCAD SHX Text damper proven CLOSED - see Notes 6 & 7)

AutoCAD SHX Text

AutoCAD SHX Text S1 (1-2)

AutoCAD SHX Text S1 (3-4)

AutoCAD SHX Text (either contact retriggers TR1 - Note 6)

AutoCAD SHX Text

TR1

AutoCAD SHX Text

ON-DELAY

AutoCAD SHX Text

TR1 - LEAD-LAG TRANSFER DELAY

AutoCAD SHX Text Field-adjustable on-delay; coil energized whenever S1 selects

AutoCAD SHX Text either DHU. Any S1 change de-energizes then re-energizes TR1

AutoCAD SHX Text (retrigger), forcing a fresh full delay - see Note 6.

AutoCAD SHX Text

AutoCAD SHX Text

CR1 (13-14) N.O.

AutoCAD SHX Text PL1 - "DHU-1 LEAD ENABLED" (amber)

AutoCAD SHX Text

AutoCAD SHX Text

CR2 (13-14) N.O.

AutoCAD SHX Text PL2 - "DHU-2 LEAD ENABLED" (amber)

AutoCAD SHX Text L1 (fused, hot)

AutoCAD SHX Text L2

AutoCAD SHX Text

SELECTOR SWITCH S1 - POSITION / TRUTH TABLE

AutoCAD SHX Text Position

AutoCAD SHX Text S1 1-2

AutoCAD SHX Text S1 3-4

AutoCAD SHX Text

CR1

AutoCAD SHX Text

CR2

AutoCAD SHX Text

DHU-1 / DHU-2

AutoCAD SHX Text

1 - DHU-1 LEAD

AutoCAD SHX Text

CLOSED

AutoCAD SHX Text open

AutoCAD SHX Text

ENERGIZED

AutoCAD SHX Text de-energ.

AutoCAD SHX Text ENABLED / disabled

AutoCAD SHX Text 2 - OFF (center)

AutoCAD SHX Text open

AutoCAD SHX Text open

AutoCAD SHX Text de-energ.

AutoCAD SHX Text de-energ.

AutoCAD SHX Text disabled / disabled

AutoCAD SHX Text

3 - DHU-2 LEAD

AutoCAD SHX Text open

AutoCAD SHX Text

CLOSED

AutoCAD SHX Text de-energ.

AutoCAD SHX Text

ENERGIZED

AutoCAD SHX Text disabled / ENABLED

AutoCAD SHX Text (both, service)

AutoCAD SHX Text true lockout - both de-energized

AutoCAD SHX Text

LEGEND

AutoCAD SHX Text N.O. contact

AutoCAD SHX Text N.C. contact

AutoCAD SHX Text Field wiring (dashed)

AutoCAD SHX Text Relay coil (CR)

AutoCAD SHX Text Pilot light (PL)

AutoCAD SHX Text Fuse

AutoCAD SHX Text Field terminal (TB)

AutoCAD SHX Text S1 = 3-pos. maintained, AutoCAD SHX Text keyed selector switch

AutoCAD SHX Text (oper. handle, see BOM)

AutoCAD SHX Text

AutoCAD SHX Text

CR1 (23-24) N.O.

AutoCAD SHX Text

AutoCAD SHX Text

POS-1-O N.O.

AutoCAD SHX Text (damper proven open, field-E-DHU-LL-003)

AutoCAD SHX Text

DHU-1 CONTROLLER

AutoCAD SHX Text

TB-__ : REMOTE ENABLE / RUN-PERMISSIVE INPUT

AutoCAD SHX Text (verify terminal ID against unit IOM)

AutoCAD SHX Text

AutoCAD SHX Text

CR2 (23-24) N.O.

AutoCAD SHX Text

AutoCAD SHX Text

POS-2A-O N.O.

AutoCAD SHX Text

POS-2B-O N.O.

AutoCAD SHX Text (POS-2A-O + POS-2B-O in series, 2-of-2 proof - E-DHU-LL-003)

AutoCAD SHX Text

DHU-2 CONTROLLER

AutoCAD SHX Text

TB-__ : REMOTE ENABLE / RUN-PERMISSIVE INPUT

AutoCAD SHX Text (verify terminal ID against unit IOM)

AutoCAD SHX Text TB1 terminal block, DHU-1 open-proof leg (1,2)

AutoCAD SHX Text TB1 terminal block, DHU-2 open-proof leg (3,4)

AutoCAD SHX Text

AutoCAD SHX Text

POS-2A-C N.O.

AutoCAD SHX Text

POS-2B-C N.O.

AutoCAD SHX Text (POS-2A-C + POS-2B-C in series, 2-of-2 proof - E-DHU-LL-003)

AutoCAD SHX Text

AutoCAD SHX Text

TO E-DHU-LL-001 - RUNG 1

AutoCAD SHX Text CR1 COIL CIRCUIT - series interlock contact

AutoCAD SHX Text (POS-2 CLOSED - see Note 7)

AutoCAD SHX Text TB1 terminal block, DA-2 closed-proof leg (5,6)

AutoCAD SHX Text

AutoCAD SHX Text

POS-1-C N.O.

AutoCAD SHX Text (damper proven closed, field - E-DHU-LL-003)

AutoCAD SHX Text

AutoCAD SHX Text

TO E-DHU-LL-001 - RUNG 2

AutoCAD SHX Text CR2 COIL CIRCUIT - series interlock contact

AutoCAD SHX Text (POS-1 CLOSED - see Note 7)

AutoCAD SHX Text TB1 terminal block, DA-1 closed-proof leg (7,8)

AutoCAD SHX Text

ENGINEERING NOTES

AutoCAD SHX Text BILL OF MATERIALS (typical / or-equal)

AutoCAD SHX Text S1 - 3-pos. maintained, KEYED selector switch, 2 N.O. contact blocksSq. D 9001KS43K5 / A-B 800T-J44 / IDEC ASD3K20N or equal

AutoCAD SHX Text CR1, CR2 - ice-cube control relays, 4PDT (4-pole), w/ socket IDEC RR4B-UL / Omron MY4N or equal

AutoCAD SHX Text TR1 - ice-cube on-delay timer relay, adj. 0-60s, DPDT, w/ socket IDEC GT3A-2AF20 or equal - see Note 6

AutoCAD SHX Text PL1, PL2 - 30mm pilot lights, amber, LED, 120VAC Sq. D 9001KP1LYA31 / A-B 800T-PH16A or equal

AutoCAD SHX Text FU1 - control-circuit fuse + holder, sized per NEC/transformer VA

AutoCAD SHX Text TB1 - terminal block, 600V rated, min. 8 poles (expand as needed)

AutoCAD SHX Text Enclosure - NEMA 1/12 per install location; coordinate w/ panel schedule

AutoCAD SHX Text POS-1-O/C, POS-2A-O/C, POS-2B-O/C - damper proven open/closed aux switches, integral to Belimo AFX24-S (see E-DHU-LL-003)

AutoCAD SHX Text

DHU-1/DHU-2 DAMPER CONTROL - POSITION & PROVEN-OPEN/CLOSED INTERLOCK DETAIL

AutoCAD SHX Text Belimo AFBUP-S 24VAC spring-return, 2-position (on/off) actuators w/ integral open + closed aux switches, slaved to DWG E-DHU-LL-001 CR1/CR2 state

AutoCAD SHX Text DHU-2 has two actuators (DA-2A/DA-2B, "pair of pants" duct split) which operate together

AutoCAD SHX Text

24VAC DAMPER ACTUATOR POWER SOURCE

AutoCAD SHX Text

FROM L1 (E-DHU-LL-001,

AutoCAD SHX Text post-FU1, 120VAC)

AutoCAD SHX Text

FU2 0.5A

AutoCAD SHX Text to T2 primary (H1)

AutoCAD SHX Text H1

AutoCAD SHX Text FROM L2 (E-DHU-LL-001, common)

AutoCAD SHX Text to T2 primary (H2)

AutoCAD SHX Text H2

AutoCAD SHX Text T2

AutoCAD SHX Text 120-24V, 40VA (see Note 4)

AutoCAD SHX Text X1

AutoCAD SHX Text X2

AutoCAD SHX Text

FU3 2.5A

AutoCAD SHX Text bond to equip.

AutoCAD SHX Text gnd bus, one pt.

AutoCAD SHX Text only (NEC 250.20)

AutoCAD SHX Text

24V HOT

AutoCAD SHX Text

24V COMMON

AutoCAD SHX Text

DHU-1 DAMPER ACTUATOR (DA-1)

AutoCAD SHX Text

CR1 (33-34) N.O.

AutoCAD SHX Text (4th pole, energized when

AutoCAD SHX Text DHU-1 selected as lead)

AutoCAD SHX Text

DA-1

AutoCAD SHX Text Belimo AFBUP-S

AutoCAD SHX Text 24VAC spring-return, 2-pos (on/off)

AutoCAD SHX Text "1" (24V hot)

AutoCAD SHX Text "2" (24V com)

AutoCAD SHX Text 2x integral SPDT aux switches:

AutoCAD SHX Text POS-1-O (open) / POS-1-C (closed)

AutoCAD SHX Text

POS-1-O

AutoCAD SHX Text

POS-1-C

AutoCAD SHX Text POS-1-O / POS-1-C - DHU-1 damper open/closed-proven switches (integral to DA-1)

AutoCAD SHX Text Factory SPDT aux switches: one fixed near the closed (spring-return) end, one field-adj. near the open end

AutoCAD SHX Text POS-1-O wired to E-DHU-LL-001 row A (series w/ CR1 23-24); POS-1-C wired to row D (series ahead of CR2 coil)

AutoCAD SHX Text Verify exact switch/wire-color assignment vs. actuator nameplate before termination - see Note 2

AutoCAD SHX Text

DHU-2 DAMPER ACTUATORS (DA-2A / DA-2B)

AutoCAD SHX Text

CR2 (33-34) N.O.

AutoCAD SHX Text (4th pole, DHU-2 lead -

AutoCAD SHX Text feeds DA-2A/DA-2B, Note 5)

AutoCAD SHX Text

DA-2A

AutoCAD SHX Text Belimo AFBUP-S

AutoCAD SHX Text 24VAC spring-return, 2-pos (on/off)

AutoCAD SHX Text "1" (24V hot)

AutoCAD SHX Text "2" (24V com)

AutoCAD SHX Text 2x integral SPDT aux switches:

AutoCAD SHX Text POS-2A-O (open) / POS-2A-C (closed)

AutoCAD SHX Text

POS-2A-O

AutoCAD SHX Text

POS-2A-C

AutoCAD SHX Text

DA-2B

AutoCAD SHX Text Belimo AFBUP-S

AutoCAD SHX Text 24VAC spring-return, 2-pos (on/off)

AutoCAD SHX Text "1" (24V hot)

AutoCAD SHX Text "2" (24V com)

AutoCAD SHX Text 2x integral SPDT aux switches:

AutoCAD SHX Text POS-2B-O (open) / POS-2B-C (closed)

AutoCAD SHX Text

POS-2B-O

AutoCAD SHX Text

POS-2B-C

AutoCAD SHX Text POS-2A-O/C, POS-2B-O/C - DHU-2 damper open/closed-proven switches (integral to DA-2A/DA-2B)

AutoCAD SHX Text POS-2A-O + POS-2B-O wired in series (2-of-2 open proof) E-DHU-LL-001 row B (series w/ CR2 23-24)

AutoCAD SHX Text POS-2A-C + POS-2B-C wired in series (2-of-2 closed proof) row C (series ahead of CR1 coil)

AutoCAD SHX Text Verify exact switch/wire-color assignment vs. actuator nameplate before termination - see Note 2

AutoCAD SHX Text

DAMPER SEQUENCE - SLAVED TO S1/CR1/CR2 LEAD-LAG STATE (E-DHU-LL-001)

AutoCAD SHX Text S1 position

AutoCAD SHX Text

CR1 / CR2

AutoCAD SHX Text

DA-1 (DHU-1)

AutoCAD SHX Text

DA-2A+2B (DHU-2)

AutoCAD SHX Text

1 - DHU-1 LEAD

AutoCAD SHX Text CR1 energ. / CR2 de-energ.

AutoCAD SHX Text powered, drives OPEN

AutoCAD SHX Text unpowered, spring CLOSED

AutoCAD SHX Text 2 - OFF (center)

AutoCAD SHX Text CR1 / CR2 both de-energ.

AutoCAD SHX Text unpowered, spring CLOSED

AutoCAD SHX Text unpowered, spring CLOSED

AutoCAD SHX Text

3 - DHU-2 LEAD

AutoCAD SHX Text CR2 energ. / CR1 de-energ.

AutoCAD SHX Text unpowered, spring CLOSED

AutoCAD SHX Text BOTH powered, drive OPEN

AutoCAD SHX Text

FAIL-SAFE BEHAVIOR

AutoCAD SHX Text Total control/24VAC power loss (T1 or T2 failure) de-energizes ALL

AutoCAD SHX Text actuators - all dampers spring-return CLOSED (<20s). No open-damper

AutoCAD SHX Text / no-airflow-path failure mode possible from a power loss.

AutoCAD SHX Text CR1/CR2 electrical + S1 mechanical interlock, PLUS the damper-closed

AutoCAD SHX Text interlock (E-DHU-LL-001 Note 7), prevent both DHU dampers being

AutoCAD SHX Text commanded open simultaneously.

AutoCAD SHX Text

ENGINEERING NOTES

AutoCAD SHX Text BOM ADDITIONS (typical / or-equal)

AutoCAD SHX Text T2 - 120-24VAC transformer, 40VA

AutoCAD SHX Text FU2, FU3 - fuses + holders, sized per Note 4 (0.5A/2.5A)

AutoCAD SHX Text DA-1 - Belimo AFBUP-S (1x), 2x integral SPDT aux sw.

AutoCAD SHX Text DA-2A, DA-2B - Belimo AFBUP-S (2x, pair-of-pants)

AutoCAD SHX Text POS-1-O/C, POS-2A-O/C, POS-2B-O/C - integral to

AutoCAD SHX Text DA-1/2A/2B (1 fixed near closed, 1 field-adj. near open)

AutoCAD SHX Text (no separate part - verify wire color vs. nameplate, Note 2)

AutoCAD SHX Text

1. Mechanical interlock is inherent to S1 (only one contact block made per position); CR1/CR2 N.C. contacts add a hard-wired electrical interlock so DHU-1 and DHU-2 can never be commanded enabled simultaneously, even on switch contact wear/bounce. 2. Center position (2 - OFF) is a true lockout: both enable relays de-energized. 3. This circuit is manual, non-alternating lead-lag; switching is a deliberate operator action at S1 - no auto-alternation/failover. 4. Confirm CR1/CR2 contact rating vs. DHU controller enable-input spec (voltage/current); use gold-flash "ice-cube" relays for low- energy/Class-2 digital inputs. If DHU enable inputs accept panel control voltage directly, S1 may feed them without CR1/CR2 (simplified alternate - omits pilot-light and interlock functions shown above). 5. POS-1-O (DA-1) and POS-2A-O+POS-2B-O (DA-2A/DA-2B, in series - 2-of-2 proof) are wired in series with the CR1/CR2 dry contacts feeding each DHU enable input - a DHU cannot be enabled unless it is selected as lead AND its associated damper(s) prove fully open. See DWG E-DHU-LL-003 for damper actuator power/position control and switch detail. 6. TR1 is a field-adjustable ON-DELAY timer relay, NOT alternation logic: its coil is energized whenever S1 selects EITHER DHU (wired off the same S1(1-2)/S1(3-4) contacts feeding CR1/CR2), and its timed N.O. contact - in series with BOTH CR1's and CR2's coil circuits - only closes after the adjustable preset elapses. Because S1 is a true 3-position switch, selecting the OTHER DHU always passes through center OFF first, so TR1's coil de-energizes (instant reset) and re-energizes fresh on every position change - the newly selected DHU cannot pick up until it has held its new position for the full delay. The outgoing DHU's CR always drops out immediately (no delay) so its spin-down begins at once. Delay is field-set at TR1's dial; confirm the actual DHU fan coast-down/spin-down time before commissioning and set TR1 with margin above it - see also Note 7 for the added physical damper-closed interlock that backs up this time delay. 7. POS-1-C (DA-1) and POS-2A-C+POS-2B-C (DA-2A/DA-2B, in series) are damper CLOSED-proof aux switches integral to the Belimo AFBUP-S actuators (2x SPDT per actuator - one open-proof, one closed-proof; see DWG E-DHU-LL-003 Note 1), wired via TB1 rows C/D in series with TR1's timed contact, ahead of CR1's/CR2's coil respectively (see rungs 1 & 2 above): DHU-1 cannot be enabled as lead until DHU-2's damper(s) are proven fully CLOSED, and vice versa. This is a physical position-based interlock IN ADDITION to the TR1 time delay (Note 6) - it guards against a stuck, slow, or mis-timed damper even if TR1's dial is set shorter than actual field conditions require.

AutoCAD SHX Text ENABLE CIRCUITS TO DHU CONTROLLERS (ROWS A/B) & DAMPER-CLOSED INTERLOCKS TO CR1/CR2 COIL CIRCUITS (ROWS C/D) - SEE DWG E-DHU-LL-003

1. Actuators are Belimo AFBUP-S: AC/DC 24V, spring-return (fail-safe close, <20s @ -20...50°C, <60s @ -30°C), two-position (on/off, non-modulating) control from a dry contact - no analog signal wire. Running time 75s/90°, torque 180 in-lb, power consumption 5W running / 2.5W holding, 7.5VA transformer-sizing basis (per Belimo datasheet). Each actuator has 2x integral SPDT auxiliary switches (1mA-3A, DC5V-AC250V): one factory-set near the spring-return (closed) end of travel, one field- adjustable - set near the driven (open) end of travel. Powered = drives open against the spring; power removed = spring drives fully closed. Only 24VAC power is switched (CR1/CR2 4th pole); the aux switches are dry contacts, wired per Note 2. 2. The dampers are fully open or fully closed (no intermediate/modulating position is used), each actuator's 2 aux switches are used directly as position feedback AND as an enable-circuit interlock. Wire colors/terminals for the two SPDT switches (commonly marked S1-S6 on Belimo "-S" actuators) shall be confirmed against the specific graphical wiring diagram for this model; before field termination, verify which switch is factory-set near closed and which is field-adjustable (set for open) against the actuator's nameplate/wiring label, and confirm Common/N.O./N.C. assignment per wire color. 3. POS-1-O (DA-1) and the POS-2A-O/POS-2B-O series pair (DA-2A/DA-2B) are each actuator's OPEN-proof integral SPDT switch, inserted in series with the CR1(23-24)/CR2(23-24) dry contacts on DWG E-DHU-LL-001 (rows A/B) - a DHU cannot be enabled unless selected as lead AND its damper(s) are proven fully open. POS-1-C (DA-1) and the POS-2A-C/POS-2B-C series pair (DA-2A/DA-2B) are each actuator's CLOSED-proof switch, wired via TB1 rows C/D directly into the OTHER unit's CR coil rung on E-DHU-LL-001 (see that drawing's rungs 1 & 2 and Note 7): the outgoing unit's damper(s) must be proven fully closed before the incoming unit's CR relay -and therefore its damper - can energize. 4. T2 (40VA) is sized for the actual connected load: DA-1 alone = 7.5VA; DA-2A+DA-2B together = 15VA (worst case, DHU-2 lead) - 40VA. FU2 (primary, 0.5A) and FU3 (secondary, 2.5A) sized at >= 125% FLA per NEC 450.3(B): primary FLA = 40VA/120V = 0.33A (125% = 0.42A); secondary FLA = 40VA/24V = 1.67A (125% = 2.08A). 5. DA-2A and DA-2B are simple parallel 24VAC loads (5W running / 2.5W holding each) - paralleling both off the same switched-hot and common conductors (CR2's 4th pole) is standard practice and needs no interposing/isolation hardware. Their aux switches (both O and C) are independent dry contacts per actuator, wired in series as described in Note 3 - not paralleled.