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WARNING
Improper installation, adjustment, alteration, service or
maintenance can cause property damage, personal injury
or loss of life. Installation and service must be performed
by a licensed professional installer (or equivalent), service
agency or the gas supplier.
CAUTION
As with any mechanical equipment, personal injury can
result from contact with sharp sheet metal edges. Be
careful when you handle this equipment.

Table Of Contents

Compact Unit Parts Arrangement................................... 3
Standard Unit Parts Arrangement.................................... 6
Shipping...........................................................................7
Optional Accessory.........................................................7
Requirements in USA ......................................................7
Requirements in Canada................................................ 7
Additional Requirements ................................................ 8
Unit Heater Installation ................................................... 8
Combustion and Ventilation Air....................................... 8
Venting.............................................................................9
Electrical Connections ................................................... 14
Be sure to read and understand the
structions in this manual.
ation, service or maintenance can cause
serious injury, death or property damage.
Do not store or use gasoline or other
cinity of this or any other appliance.
formed by a qualified installer, service
agency or the gas supplier.
RETAIN THESE INSTRUCTIONS
FOR FUTURE REFERENCE
WARNING
FIRE OR EXPLOSION HAZARD.
Failure to
ly could result in serious injury, death,
or property damage.
WHAT TO DO IF YOU SMELL GAS:
Do not try to light any appliance.
Do not touch any electrical switch; do not use
any phone in your building.
Leave the building immediately.
Immediately call your gas supplier from a
neighbor's
structions.
If you cannot reach your gas supplier, call the
fire department.
Page 1
INSTALLATION
INSTRUCTIONS
UH(RS,CM)
30,000 to 400,000 Btuh Series
UNIT HEATERS
507938-01
6/2019
Gas Connection ................................................... 18
Leak Check ......................................................... 18
Unit Start-Up ........................................................ 18
To Turn Off Gas to Unit .......................................... 19
Heating Sequence of Operations ............................ 19
Ignition Control LED .............................................. 20
High Altitude Adjustments ...................................... 20
Gas Flow ............................................................. 20
Gas Pressure Adjustments..................................... 20
Limit Control Switch .............................................. 21
Louver Vane Adjustment ........................................ 21
Combustion Air Pressure Switch ............................. 21
Flame Rollout Switch ............................................ 21
Service ................................................................ 21
Start-Up and Performance Checklist........................ 22

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Summarization of Contents

Installation Requirements and Compliance
Shipping and Accessories
Information on unit contents, accessories, and preparation for installation.
USA Installation Standards
Compliance with US codes, ANSI Z223.1, NFPA standards, and specific clearances.
Canada Installation Standards
Compliance with Canadian codes, CSA standards, and specific clearances for various applications.
Additional Requirements and Installation
Massachusetts Specific Requirements
Additional installation requirements for the Commonwealth of Massachusetts, including licensed personnel and gas cock type.
Unit Heater Installation Overview
General guidance for unit placement, clearances, and preparation for installation.
Combustion Air Inducer Rotation and Venting
Combustion Air Inducer Rotation
Instructions for rotating the combustion air inducer on specific UHCM models for optimal vent discharge.
Venting Recommendations
General guidelines and requirements for proper venting of unit heaters in compliance with codes.
Horizontal Venting Guidelines
Residential and Commercial Horizontal Venting
Specific requirements and limitations for horizontal venting in residential and commercial applications.
Horizontal Vent Termination Clearances
Minimum clearances for horizontal vent terminations from various building features and utilities.
Masonry Chimney Venting
Prohibited and Permitted Masonry Venting
Rules against single appliance venting into lined masonry chimneys and conditions for common venting.
Electrical Connections
Wiring Diagrams and Grounding
Instructions for high voltage and low voltage wiring, including grounding requirements and thermostat connections.
Gas Supply and Leak Check
Gas Connection Details
Guidance on connecting gas supply, pipe sizing, drip legs, and shutoff valves.
Leak Check Procedure
Safe methods for checking gas piping connections for leaks using soap solution or other means.
Unit Start-Up Procedures
Pre-Lighting Safety Precautions
Critical safety warnings including electrical shock, explosion, and gas exposure hazards before unit ignition.
Gas Valve Operation and Safety
White Rodgers Gas Valve Operation
Instructions for operating White Rodgers 36H and 36G series gas valves.
Turning Off Gas to Unit
Procedure for safely shutting off the gas supply to the unit for service or maintenance.
Ignition Control and Altitude Settings
Ignition Control LED Status
Interpretation of ignition control LED indicators for unit operation and fault diagnosis.
Gas Flow and Pressure Settings
Gas Pressure Adjustment
Guidance on checking and adjusting manifold pressure for natural gas and LP/propane at various altitudes.
Unit Switches and Adjustments
Limit Control and Louver Adjustment
Details on limit control switches and adjusting louver vanes for airflow direction.
Pressure & Rollout Switch Checks
Information on combustion air pressure and flame rollout switches, their function, and adjustment.
Service and Troubleshooting
Maintenance Procedures
Guidelines for servicing burners, flue passages, inducer, and electrical connections.
Troubleshooting Unit Failures
Steps for diagnosing and troubleshooting unit operational failures, including thermostat, breaker, and pressure switch checks.
Unit Heater Limited Warranty
Warranty Terms and Conditions
Details on the standard and extended warranty periods for unit heaters and heat exchangers.
Extended Component Coverage
Information on extended coverage for Aluminized and Stainless Steel Heat Exchangers.

Table of Contents