ACS Training Center Unit Heater Replacement.pdf

Alaska Court System Training Center Warehouse Unit Heater Replacement

701 East Tudor Road, Suite 250

Anchorage, AK 99503 | 907.257.9100

2950 Newmarket Street, Suite 101 PMB 265

Bellingham, WA 98226 | 360.255.7235 amc-engineers.com

May 23, 2024

24803/ACSTRAIN

Alaska Court System Training Center May 23, 2024

Table of Contents

General

Existing Condition

Recommendations

Unit Heater Replacement

Warehouse Ventilation

Appendices

Appendix A –Sketch SK-M/E; Floorplan with unit heater and electrical panel locations (1 page)

Appendix B – Photos of existing unit heaters (4 pages)

Appendix C – Recommended replacement unit heater schedule and cutsheets (14 pages)

ACS Training Center May 23, 2024

General

This report provides recommendations for replacement of the existing gas fired unit heaters in the warehouse spaces of the Alaska Court System (ACS) Training Center located in Anchorage.

The replacement of the gas fired unit heaters will require compliance with the Municipality of Anchorage

(MOA) adopted codes and local amendments which currently include the 2018 International Fuel Gas Code

(IFGC) and the 2020 National Electric Code (NEC).

Existing Condition

The Training Center warehouse spaces are heated by three ceiling hung gas fired unit heaters (UH-1, UH-

2, UH-3). Refer to drawing SK-M/E in Appendix A for unit locations and Appendix B for photos of the existing units.

Venting for unit heaters UH-1 and UH-2 penetrate the concrete north wall of the building, and the vent for

UH-3 penetrates through the roof. Units are single stage, standing pilot appliances. Venting from appliances are galvanized single wall metal pipe. The roof penetration of the vent from UH-3 is not code compliant, as clearance to combustibles of 6 inches or a noncombustible, nonventilating thimble is not used at the point of passage (IFGC Sections 503.7 and 503.7.7).

Combustion air for the unit heaters is obtained directly from the indoor warehouse space. The unit heaters comply with the IFGC Section 304.5.1 requirement of a minimum of 50 cubic feet of warehouse space per

1,000 BTU/hr of unit heater input rating.

Electrical Power Distribution: Refer to drawing SK-M/E in Appendix A for panel locations. The main distribution panel (MDP) is a 208/120V panel on the first floor. It feeds interior panels A, B, C, and exterior panel D. Panel A is a flush mount 30 space 125 Main Lug panel. Panels B and C are both surface mount 42 space 250 Main Lug panels. Panel D was not located, but it is assumed that the UHs are not fed from it.

Panel Schedules did not provide circuit numbers for the Unit Heaters, so the circuits will need to be field verified by the Contractor.

All circuit breakers found on the interior panels had a rating of 20A or greater. The current installation of the existing unit heaters requires circuit breakers at 15A to comply with NEC 430.52.

Recommendations

Unit Heater Replacement

The warehouse spaces are reported to be adequately heated with the three existing unit heaters.

Therefore, replacement units of the same output heat rating are recommended.

An MOA mechanical retrofit permit can be utilized for the unit heater replacement and no stamped mechanical construction drawings are required as long as the heat capacity of the replacement units matches the existing units.

ACS Training Center May 23, 2024

New venting material for the replacement unit heaters will be required. The same wall and roof penetrations can be utilized. Venting installation should follow the manufacturer’s recommended installation instructions and code requirements.

New thermostats for all replacement unit heaters are recommended.

Replacement unit heaters manufactured by Modine are recommended. The recommended unit heaters have aluminized tubular heat exchangers and have a ten year warranty. An equipment schedule and cutsheets are provided in Appendix C.

Electrical:

UH-1: Existing conduit and conductors will need to be demolished to the nearest existing to remain junction box or device and made safe. The closest panel to UH-1 is the MDP and will require a concrete wall penetration. New 1/2” conduit and #10 AWG conductors will be needed to connect the MDP to UH-

1. A single 1-pole 30A circuit breaker on the MDP will feed UH-1.

UH-2 and UH-3: Existing conduit and conductors will need to be demolished to the nearest existing to remain junction box or device and made safe. New conduit and conductors will run from Panel A to UH-2 and continue to UH-3. A single 1-pole 15A circuit breaker on Panel A will feed both UH-2 and UH-3.

Electrical construction drawings stamped by an engineer will be required for the MOA electrical permit because more than a single 1-pole 20 amp circuit breaker is being provided.

Warehouse Ventilation

No ventilation is currently provided for the warehouse areas. Per the 2018 International Mechanical

Code, warehouse spaces are required to provide a minimum of 10 cubic feet per minute (CFM) of outside air per person and 0.06 CFM per square foot of outside air. Assuming 2 people as the normal occupancy in the space, the minimum required outside air is 670 CFM.

Ventilation for the warehouse spaces is recommended and is required by code.

APPENDIX A

SCALE:

SK-M/E

LEVEL 1 FLOORPLAN

1/16" = 1'-0"

0 8' 16' 32' 48'

GENERAL NOTES

Sketch NumberSketch Description

Date:

Project No.: 24803

Drawn:

Checked:

www.amc-engineers.com Adams, Morgenthaler & Co., Inc.

C.A.N.: AECC342 - 907.257.9100

701 E. Tudor Rd. Suite 250 Anchorage, AK 99503

Alaska Court System Training Center

Unit Heater Replacement

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Equipment Locations

APPENDIX B

APPENDIX C

UNIT HEATER SCHEDULE

SYMBOL LOCATION INPUT OUTPUT MOTOR WEIGHT REMARKS, BASIS OF DESIGN

(MBH) (MBH) (HP,V,PH) (LBS)

UH-1 EAST 350 287 1-1/2,115,1 400 GAS FIRED UNIT HEATER:

WAREHOUSE SINGLE STAGE, DIRECT SPARK IGNITION.

MODINE MODEL BTP350

UH-2 NORTHWEST 100 82 1/6,115,1 150 GAS FIRED UNIT HEATER:

WAREHOUSE SINGLE STAGE, DIRECT SPARK IGNITION.

MODINE MODEL HD100

UH-3 WEST 250 208 1/3,115,1 260 GAS FIRED UNIT HEATER:

WAREHOUSE SINGLE STAGE, DIRECT SPARK IGNITION.

MODINE MODEL PTP250

X:\24803 ACSTRAIN\Design Mech\Sched\ACSTRAIN Mech Schedules

5/16/2024

HTG UNIT

AccuSpec V4.50

SUBMITTAL SCHEDULE & DATA

Gas- and Oil-Fired Unit Heaters, Infrared Heaters, and Indoor Duct Furnaces

Job Name: Replacement Heaters Date: 05/14/2024 Location: Engineer: AMC Engineers Submitted by: Steve Kreun Architect:

Contractor:

Unit Tag

Model Number HD

100AS0111FBAN

PTP250AS0111SBA

N

BTP350AS0211NBA

N

Quantity of Units 1 1 1 Btu/Hr Input 100,000 250,000 350,000 Btu/Hr Output 82,000 207,500 287,000

CFM 1490 3995 4,200

Altitude 0-2000 0-2000 0-2000 Temperature Rise (degrees F) 51 48 63 External Static Pressure (E.S.P) 0.00 0.00 0.00 Total Static Pressure (T.S.P.) 0.00 0.00 0.000 Gas Type Natural Natural Natural Gas Control Type Single Stage, Direct

Spark Ignition, 100% Shut-Off with Continuous Retry

Single Stage, Direct Spark Ignition, 100% Shut-Off with Continuous Retry

Single Stage, Direct Spark Ignition, 100% Shut-Off with Continuous Retry

Supply Voltage 115/60/1 115/60/1 115/60/1 Control Voltage 24V 24V 24V Motor HP 1/6 1/3 1-1/2 Motor RPM 1100 1075 1725 Blower RPM N/A N/A 466 Heat Exchanger Type Aluminized Steel

Heat Exchanger/Burner

Aluminized Steel Heat Exchanger/Burner

Aluminized Steel Heat Exchanger/Burner

Thermal Efficiency % 82.0 83.0 82.0 Options & Accessories (See Attached Pages)

Remarks___________________________________________________________________________________________

UH-2 UH-1UH-3

GENERAL PERFORMANCE DATA

General Performance Data

Model HD 100 At 0’ Elevation Btu/Hr. Input 100,000 Btu/Hr. Output 82,000 Entering Airflow (CFM) 1490 Outlet Velocity 565 Air Temp. Rise (°F) 50 Mounting Height (Max Ft.)1 12 Heat Throw (Max. Mtg. Ft.) 2 42 Unit Total Power (Amps) 5.05

As Configured at 0-2000 Ft. Elevation Btu/Hr. Input 100,000 Btu/Hr. Output 82,000 Configured Air Temp Rise (°F) 51

Motor Data Horse Power 1/6

RPM 1100

Type P.S.C.

Motor Amps at 115V 2.50

Clearances to Combustibles Top and Bottom 1” Vent Connector 4” Access Side 18” Non-Access Side 1” Rear 18”

1 At 65°F ambient and unit fired at full-rated input. Mounting height as measured from bottom of unit.

2 Heat Throws are calculated at 65°F ambient with a 51°F air temperature rise with the unit mounted at a maximum mounting height of 12 feet.

UH-2

DIMENSIONS – UNIT

Model HD Dimensions

Model Size HD100 Dimensions (in inches)

A 35.5 B 20.5 C 22 D 22.52 E 13.4 F 14 G - H 8.38 I 43 J 30.63

Vent Connector Diameter

Gas Connection Diameter

1/2

Fan Diameter 18 Approx. Shipping

Weight 143 lbs.

UH-2

Standards

All unit(s) shall include:

The gas fired unit heater(s) shall include ETL Listed and ETL Verified design certification for use in both the US and Canada to the ANSI Z83.8 - latest revision, standard for “Gas Unit Heater and Gas- Fired Duct Furnaces” for safe operation, construction, and performance.

Mechanical Configuration

Furnace(s) section with 82.0% minimum efficiency provided by an indirect-fired tubular heat exchanger with individually fired tubes for maximum heat transfer with minimal noise of flame ignition/extinction.

Venting Arrangement

The venting shall be a power exhausted arrangement. The unit shall be tested to insure proper ignition when the unit is subjected to 40 mile per hour wind velocities. The unit shall also include a factory mounted differential pressure switch designed to prevent main burner ignition until positive venting has been proven.

Unit Casing

The unit heater(s) casing shall be constructed of not less than 22 gauge aluminized steel with minimization of exposed fasteners.

All exterior casing parts shall be cleaned of all oils and a phosphate coating applied prior to painting. The exterior casing parts shall then be painted with an electrostatically applied baked-on gray-green polyester powder paint (7-mil thickness) for corrosion resistance.

The unit shall be furnished with horizontal air deflectors. The deflectors are adjustable to provide for horizontal directional airflow control (up or down).

Furnace Section

The heat exchanger(s) shall be made of 18 gauge aluminized steel tubes and headers.

The thermal efficiency of the unit(s) shall be a minimum of 82.0 efficient for all air flow ranges.

Each heat exchanger tube shall be individually and directly flame-fired. The heat exchanger tube shall be crimped to allow for thermal expansion and contraction. The flue collector box shall be made of 20 gauge aluminized steel.

The heat exchanger(s) seams and duct connections shall be certified to withstand 0.9" W.C.

external static pressure without burner flame disturbance.

The burner(s) shall be in-shot type, directly firing each heat exchanger tube individually and is designed for good lighting characteristics without noise of extinction for both natural and propane gas.

The ignition controller(s) shall be 100% shut-off with continuous retry.

The gas pressure shall be between 6-7" W.C for natural gas.

The solid state ignition system shall directly light the gas by means of a direct spark igniter each time the system is energized.

The unit gas controls shall be provided with the following:

Single-stage gas controls with a single-stage combination gas control, an ignition control. The unit fires at 100% full fire based on a call for heat from a room thermostat.

An automatic reset high limit switch mounted in the air stream to shut off the gas supply in the event of overheating.

A time delay relay that delays the start of the air mover to allow the heat exchanger a warm-up period after a call for heat. The time delay relay shall also continue the air mover operation after the thermostat has been satisfied to remove any residual heat in the heat exchanger.

The unit must be field adjusted for 0-2000 feet elevation above sea level. See units installation manual for instruction for altitude adjustments.

Electrical

All electrical components shall carry UL, ETL, or CSA certification.

A low voltage terminal board shall be provided for direct wiring connection to an external thermostat.

A single 115V to 24V step down transformer shall be provided for all unit controls.

Air Mover

The motor horsepower shall be 1/6 H.P.

The motor wiring shall be in flexible metal BX conduit.

The motor shall be controlled by a time delay relay.

Propeller models shall meet the following requirements:

The motor type shall be Single-Speed, Totally Enclosed (TE).

The air mover motor shall be a 115V motor.

Mounting

The unit shall be equipped with tapped holes to accept 3/8”-16 threaded rod for suspension.

Accessories

The following field installed accessory control devices shall be provided with the unit:

General Performance Data

Model PTP 250 At 0’ Elevation Btu/Hr. Input 250,000 Btu/Hr. Output 207,500 Entering Airflow (CFM) 3995 Outlet Velocity 721 Air Temp. Rise (°F) 47 Mounting Height (Max Ft.)1 18 Heat Throw (Max. Mtg. Ft.) 2 62 Unit Total Power (Amps) 7.15

As Configured at 0-2000 Ft. Elevation Btu/Hr. Input 250,000 Btu/Hr. Output 207,500 Configured Air Temp Rise (°F) 48

Motor Data Horse Power 1/3

RPM 1075

Type P.S.C.

Motor Amps at 115V 4.60

Clearances to Combustibles Top and Bottom 6” Vent/Combustion Air Connector 6” Access Side 6” Non-Access Side 6” Rear 18”

1 At 65°F ambient and unit fired at full-rated input. Mounting height as measured from bottom of unit.

2 Heat Throws are calculated at 65°F ambient with a 48°F air temperature rise with the unit mounted at a maximum mounting height of 18 feet.

UH-3

Model PTP Dimensions

Model Size PTP250 Dimensions (inches)

A 42.53 I 4.5 B 31.31 J 6.72 C 22.05 M 33.83 D 29.52 Q 2 45.83 E 24.46 R 3.56 F 19.45 S 14.9

G (Mounting Holes)

3/8-16 T 10

H 8.37 U 20.53

Gas Connection 3/4 Fan Diameter 22 Vent/Combustion Air Connection Size 6 Approx. Shipping Weight 256 lbs.

1 All models have 4 holes for mounting. Listed is the hole diameter and threads per inch to accept threaded rod.

2 Dimension equals overall plus 12”.

UH-3

The gas fired unit heater(s) shall include ETL Listed and ETL Verified design certification for use in both the US and Canada to the ANSI Z83.8 - latest revision, standard for “Gas Unit Heater and Gas- Fired Duct Furnaces” for safe operation, construction, and performance.

Mechanical Configuration

Furnace(s) section with 83.0% minimum efficiency provided by an indirect-fired tubular heat exchanger with individually fired tubes for maximum heat transfer with minimal noise of flame ignition/extinction.

Venting Arrangement

The venting shall be a power exhausted arrangement. The unit shall be tested to insure proper ignition when the unit is subjected to 40 mile per hour wind velocities. The unit shall also include a factory mounted differential pressure switch designed to prevent main burner ignition until positive venting has been proven.

Unit Casing

The unit heater(s) casing shall be constructed of not less than 20 gauge aluminized steel with minimization of exposed fasteners.

All exterior casing parts shall be cleaned of all oils and a phosphate coating applied prior to painting. The exterior casing parts shall then be painted with an electrostatically applied baked-on gray-green polyester powder paint (7-mil thickness) for corrosion resistance.

The unit shall be furnished with horizontal air deflectors. The deflectors are adjustable to provide for horizontal directional airflow control (up or down).

Furnace Section

The heat exchanger(s) shall be made of 18 gauge aluminized steel tubes and headers.

The thermal efficiency of the unit(s) shall be a minimum of 83.0 efficient for all air flow ranges.

Each heat exchanger tube shall be individually and directly flame-fired. The heat exchanger tube shall be crimped to allow for thermal expansion and contraction. The flue collector box shall be made of 20 gauge aluminized steel.

The heat exchanger(s) seams and duct connections shall be certified to withstand 0.9" W.C.

external static pressure without burner flame disturbance.

The burner(s) shall be in-shot type, directly firing each heat exchanger tube individually and is designed for good lighting characteristics without noise of extinction for both natural and propane gas.

The ignition controller(s) shall be 100% shut-off with continuous retry.

The gas pressure shall be between 6-7" W.C for natural gas.

The solid state ignition system shall directly light the gas by means of a direct spark igniter each fires at 100% full fire based on a call for heat from a room thermostat.

An automatic reset high limit switch mounted in the air stream to shut off the gas supply in the event of overheating.

A time delay relay that delays the start of the air mover to allow the heat exchanger a warm-up period after a call for heat. The time delay relay shall also continue the air mover operation after the thermostat has been satisfied to remove any residual heat in the heat exchanger.

The unit must be field adjusted for 0-2000 feet elevation above sea level. See units installation manual for instruction for altitude adjustments.

Electrical

All electrical components shall carry UL, ETL, or CSA certification.

A low voltage terminal board shall be provided for direct wiring connection to an external thermostat.

A Contractor Convenience Package that consists of an external junction box featuring simple connection of supply power wiring internally, thermostat wiring to terminals externally, an On/Off switch, and status indicator lights to display the operational state of the unit shall be factory mounted on the rear panel of the casing.

A single 115V to 24V step down transformer shall be provided for all unit controls.

Air Mover

The motor horsepower shall be 1/3 H.P.

The motor wiring shall be in flexible metal BX conduit.

The motor shall be controlled by a time delay relay.

Propeller models shall meet the following requirements:

The motor type shall be Single-Speed, Totally Enclosed (TE).

The air mover motor shall be a 115V motor.

Mounting

The unit shall be equipped with tapped holes to accept 3/8”-16 threaded rod for suspension.

Propeller Unit to have two point adjustable suspension points to allow for level hanging with a variety of accessories.

Accessories

The following field installed accessory control devices shall be provided with the unit:

General Performance Data

Model BTP 350 At 0’ Elevation Btu/Hr. Input 350,000 Btu/Hr. Output 287,000 Minimum Airflow (CFM) 3703 Maximum Airflow (CFM) 6482 Minimum Air Temp. Rise (°F) 41.0 Maximum Air Temp. Rise (°F) 71.8 Maximum Static Pressure (in.w.c.)

0.7

Unit Total Power (Amps) Condensate Produced (gal/hr)

21.7

As Configured at 0-2000 Ft. Elevation Btu/Hr. Input 350,000 Btu/Hr. Output 287,000 Configured Air Temp Rise (°F) 63

Motor Data Horse Power 1-1/2 Maximum RPM 1725 Type P.S.C.

Motor Amps 20.00

Clearances to Combustibles Top and Bottom 6” Vent/Combustion Air Connector 6” Access Side 6” Non-Access Side 6” Rear 18”

UH-1

Model BTP Dimensions

Model Size BTP350 Dimensions (inches)

A 42.53 N 39.88 B 39.56 O 28.57 C 22.05 P 28.28 D 29.52 Q (w/Blower Encl & Filter

Rack) 70.88

E 37.68 Q (w/o Blower Encl & Filter Rack)

79.68

F 23.58 R 3.56 G (Mounting Holes)

3/8-16 S 14.9

H 8.37 T 10 I 4.5 U 20.53 J 10.84 V 18 K 5.2 W 5.24 L 16.78 X 20.38

M 2 58.88

Gas Connection 3/4 Blower Size 15-15 Vent/Combustion Air Connection Size 6 Filter Rack Width (if ordered) Approx. Shipping Weight 395 lbs.

1 All models have 6 holes for mounting. Listed is the hole diameter and threads per inch to accept threaded rod.

2 This is an approximate dimension for standard motors. Allow 3” for sheave and optional motors.

UH-1

The gas fired unit heater(s) shall include ETL Listed and ETL Verified design certification for use in both the US and Canada to the ANSI Z83.8 - latest revision, standard for “Gas Unit Heater and Gas- Fired Duct Furnaces” for safe operation, construction, and performance.

Mechanical Configuration

Furnace(s) section with 82.0% minimum efficiency provided by an indirect-fired tubular heat exchanger with individually fired tubes for maximum heat transfer with minimal noise of flame ignition/extinction.

Venting Arrangement

The venting shall be a power exhausted arrangement. The unit shall be tested to insure proper ignition when the unit is subjected to 40 mile per hour wind velocities. The unit shall also include a factory mounted differential pressure switch designed to prevent main burner ignition until positive venting has been proven.

Unit Casing

The unit heater(s) casing shall be constructed of not less than 20 gauge aluminized steel with minimization of exposed fasteners.

All exterior casing parts shall be cleaned of all oils and a phosphate coating applied prior to painting. The exterior casing parts shall then be painted with an electrostatically applied baked-on gray-green polyester powder paint (7-mil thickness) for corrosion resistance.

The unit shall be furnished with horizontal air deflectors. The deflectors are adjustable to provide for horizontal directional airflow control (up or down).

Furnace Section

The heat exchanger(s) shall be made of 18 gauge aluminized steel tubes and headers.

The thermal efficiency of the unit(s) shall be a minimum of 82.0 efficient for all air flow ranges.

Each heat exchanger tube shall be individually and directly flame-fired. The heat exchanger tube shall be crimped to allow for thermal expansion and contraction. The flue collector box shall be made of 20 gauge aluminized steel.

The burner(s) shall be in-shot type, directly firing each heat exchanger tube individually and is designed for good lighting characteristics without noise of extinction for both natural and propane gas.

The ignition controller(s) shall be 100% shut-off with continuous retry.

The gas pressure shall be between 6-7" W.C for natural gas.

The solid state ignition system shall directly light the gas by means of a direct spark igniter each fires at 100% full fire based on a call for heat from a room thermostat.

An automatic reset high limit switch mounted in the air stream to shut off the gas supply in the event of overheating.

A time delay relay that delays the start of the air mover to allow the heat exchanger a warm-up period after a call for heat. The time delay relay shall also continue the air mover operation after the thermostat has been satisfied to remove any residual heat in the heat exchanger.

The unit must be field adjusted for 0-2000 feet elevation above sea level. See units installation manual for instruction for altitude adjustments.

Electrical

All electrical components shall carry UL, ETL, or CSA certification.

A low voltage terminal board shall be provided for direct wiring connection to an external thermostat.

A Contractor Convenience Package that consists of an external junction box featuring simple connection of supply power wiring internally, thermostat wiring to terminals externally, an On/Off switch, and status indicator lights to display the operational state of the unit shall be factory mounted on the rear panel of the casing.

A single 115V to 24V step down transformer shall be provided for all unit controls.

A Step-Down Transformer (Provided By Others) is required to operate the unit.

Air Mover

The motor horsepower shall be 1-1/2 H.P.

The motor wiring shall be in flexible metal BX conduit.

The motor shall be controlled by a time delay relay.

Blower models shall meet the following requirements:

The motor type shall be Totally Enclosed (TE).

The motor shall be rated for 115V/60Hz/1Ph.

The motor shall be provided with an adjustable motor sheave to allow for minor adjustment of the blower rpm at the job site.

The blower shall be a double width, double inlet (DWDI), forward curved, belt driven, assembly with spider ball bearings.

Mounting

The unit shall be equipped with tapped holes to accept 3/8”-16 threaded rod for suspension.

Blower unit to have 6 suspension points.