8107_mi5v8.pdf

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DATE

PROJECT NO:

DRAWING NO:

AS SHOWN

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SHEET MI5 OF12

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17 NOV 16

DPW 03383-6J

DDC

HW-PMP-SS

L1

L2

L3

FUSE

X1

CIRCUIT BREAKER

XMFR

X2

CT

DDC

AUTO

HAND

OFF MS-1

OL'S

PUMP MOTOR

M1

HW-PMP-S

DDC

CW-PMP-SS

L1

L2

L3

FUSE

X1

CIRCUIT BREAKER

XMFR

X2

CT

DDC

AUTO

HAND

OFF MS-1

OL'S

PUMP MOTOR

M1

CW-PMP-S

HW PUMP LADDER DIAGRAM

CW PUMP LADDER DIAGRAM

SEQUENCE OF OPERATIONS/ LADDER DIAGRAMS

L2

FUSE

X1

L1

XMFR

X2

V-1

HX-DP-LL

HTHW ACTUATOR

TO:

DDC-##

HIGH TEMPERATURE HOT WATER ACTUATOR SAFETY

TO MAINTAIN DIFFERENTIAL PRESSURE.

COMMAND(CW-PMP-SS) THE CHILLED WATER PUMP ON AND THE SPEED SHALL MODULATE

D. CHILLED WATER PUMP CONTROL: WHEN THIS LOOP IS ENABLED THE DDC HARDWARE SHALL

(3) SAFETIES: NONE

CHILLED WATER PUMP STATUS (CW-PMP-S)

(2) PROOFS:

(1) DDC HARDWARE SHALL MONITOR PROOFS AND SAFETIES.

C. PROOFS AND SAFETIES

(3) WHEN THE OUTDOOR AIR TEMPERATURE IS 64°F OR BELOW THIS SYSTEM SHALL BE DISABLED.

BE ENABLED COOLING MODE. THE OUTDOOR AIR TEMPERATURE CHANGEOVER SHALL HAVE A 2 DEGREE F DEADBAND.

(2) WHEN THE OUTDOOR AIR TEMPERATURE IS 66°F OR ABOVE AND A COOLING REQUEST THIS SYSTEM SHALL

(1) THIS SYSTEM SHALL MONITOR THE OUTDOOR AIR TEMPERATURE.

B. SYSTEM ENABLE AND LOOP ENABLE

BE UNDER CONTROL OF THE DDC SYSTEM..

TO THE CHILLED WATER PUMP START/STOP COMMAND (CW-PMP-SS) AND SAFETIES AND

(3) AUTO: WITH THE H-O-A SWITCH IN AUTO POSITION, THE CHILLED WATER PUMP SHALL RUN SUBJECT

(2) OFF: WITH THE H-O-A SWITCH IN THE OFF POSITION, THE CHILLED WATER PUMP SHALL STOP.

RUN CONTINUOUSLY, SUBJECT TO SAFETIES.

(1) HAND: WITH THE H-O-A SWITCH IN HAND POSITION, THE CHILLED WATER PUMP SHALL START AND

CHILLED WATER PUMP VFD SHALL HAVE AN INTEGRAL H-O-A SWITCH:

A. HAND-OFF-AUTO SWITCHES:

SPECIFIED, ALL MODULATING CONTROL SHALL BE PROPORTIONAL-INTEGRAL (PI) CONTROL.

INPUTS, OUTPUTS AND ALARMS AS SPECIFIED AND SHOWN ON THE POINTS SCHEDULE. UNLESS OTHERWISE

CONTRACTOR SHALL INSTALL DDC HARDWARE TO PERFORM THIS SEQUENCE OF OPERATION AND TO PROVIDE SNVT

CHILLED WATER CONTROL

EXCHANGER SAFETY SWITCH(HX-P-LL). WHEN THIS LOOP IS DISABLED THE VALVE SHALL BE CLOSED.

A LINEAR RESET SCHEDULE AS SHOWN. THE DDC HARDWARE SHALL MONITOR THE STATUS OF THE HEAT

(HWS-T) AT SETPOINT(HWS-T-SP). THE HOT WATER SUPPLY TEMPERATURE SETPOINT SHALL BE DETERMINED FROM

TEMPERATURE

SHALL MODULATE THE HIGH TEMPERARURE HOT WATER VALVE TO MAINTAIN THE THE HOT WATER SUPPLY

HEAT EXCHANGER AS SENSED BY THE DIFFERENTIAL PRESSURE SWITCH(HX-P-LL) SAFETY, THE DDC HARDWARE

D. HEAT EXCHNGER VALVE CONTROL: WHEN THIS LOOP IS ENABLED AND THERE IS WATER FLOW THROUGH THE

HIGH TEMPERATURE HOT WATER VALVE.

HEAT EXCHANGER DIFFERENTIAL PRESSURE SWITCH(HX-P-LL) SHALL BE DIRECT-HARDWIRE INTERLOCKED TO THE

(3) SAFETIES:

HEATING WATER PUMP STATUS (HW-PMP-S)

(2) PROOFS:

(1) DDC HARDWARE SHALL MONITOR PROOFS AND SAFETIES.

C. PROOFS AND SAFETIES

EXCHANGER CONTROL LOOP SHALL BE ENABLED.

(3) WHEN THIS SYSTEM IS ENABLED(SYS-ENA) AND THE HOT WATER PUMP IS PROOFED ON, THE HEAT

(2) WHEN THE OUTDOOR AIR TEMPERATURE IS 65°F OR BELOW THIS SYSTEM SHALL BE IN HEATING MODE.

(1) THIS SYSTEM SHALL MONITOR THE OUTDOOR AIR TEMPERATURE.

B. SYSTEM ENABLE AND LOOP ENABLE

CONTROL OF THE DDC SYSTEM. PUMP SPEED SHALL MODULATE TO MAINTAIN DIFFERNTIAL PRESSURE SETTING.

SUBJECT TO THE HEATING WATER PUMP START/STOP COMMAND (HW-PMP-SS) AND SAFETIES AND BE UNDER

(3) AUTO: WITH THE H-O-A SWITCH IN AUTO POSITION, THE HEATING WATER PUMP SHALL RUN

(2) OFF: WITH THE H-O-A SWITCH IN THE OFF POSITION, THE HEATING WATER PUMP SHALL STOP.

RUN CONTINUOUSLY, SUBJECT TO SAFETIES.

(1) HAND: WITH THE H-O-A SWITCH IN HAND POSITION, THE HEATING WATER PUMP SHALL START AND

HEATING WATER PUMP VFD SHALL HAVE AN INTEGRAL H-O-A SWITCH:

A. HAND-OFF-AUTO SWITCHES:

SPECIFIED, ALL MODULATING CONTROL SHALL BE PROPORTIONAL-INTEGRAL (PI) CONTROL.

INPUTS, OUTPUTS AND ALARMS AS SPECIFIED AND SHOWN ON THE POINTS SCHEDULE. UNLESS OTHERWISE

CONTRACTOR SHALL INSTALL DDC HARDWARE TO PERFORM THIS SEQUENCE OF OPERATION AND TO PROVIDE SNVT

HEATING HOT WATER FROM DISTRIBUTED HTHW CONVERTER

VFD

VFD

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C8107.27