Temp-Heat THP-500A - User Manual

Installation and Service Manual
THP-400A, THP-500A and THP-550
Gas, Direct-Fired Process Heater
1-800-836-7432
Heating
Cooling
Dehumidifying
Ventilating
For your safety,
do not use this heater in a
space where gasoline or
other liquids having
flammable vapors are
stored or used.
Warning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
Rating Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
Control Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6
Fuel Supply System — Bulk-Tank System . . . . . . . . . . . . . . . . . . . . . . . . . .7
Natural-Gas Installations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8
Set-Up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8
Preliminary Start-Up Steps . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9
Control Vestibule Layouts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10
Start-Up Steps . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12
Shut-Down Steps . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13
Short-Term . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13
Long-Term or Disconnect . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13
Wiring Sequence of Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14
Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20
Control Adjustments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .22
Ignition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .22
Airflow Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .22
Setting Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .22
To Check Setting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .22
This manual is the property of the
owner. Leave with the unit when
set-up and start-up are complete.

Summary

Warning

General Hazard Warning

General safety precautions to prevent death, injury, and property damage from hazards like fire, explosion, and shock.

Fire, Burn, Inhalation, and Explosion Hazard

Keep combustibles away; avoid volatile or airborne combustibles such as gasoline or solvents.

Not for Home or Recreational Vehicle Use

Heater usage restrictions and advice to check with local fire safety authorities for applications.

Introduction

Rating Information

Control Functions

Fuel Supply System

Bulk-Tank System

Outlines installation compliance, tank location, regulator requirements, and vaporizer placement for propane.

Natural Gas Installations

Set-Up

Preliminary Start-Up Steps

Steps before initial operation, including checking connections, purging gas, leak testing, and verifying airflow.

Control Vestibule Layout

Start-Up Steps

Shut-Down Steps

Short-Term Shut Down

Procedure for temporarily turning off the heater, including turning off switches and waiting.

Extended Shut-down or Disconnection of Unit

Steps for longer-term shutdown or disconnecting the unit, including closing fuel valves and power.

Wiring - THP-400 A

THP-400 A Sequence of Operation

Wiring - THP-500 A

THP-500 A Sequence of Operation

Wiring - THP-550

THP-550 Sequence of Operation

Troubleshooting

Control Adjustments

Ignition

Instructions for cleaning, checking, and adjusting ignition electrodes and leads for proper spark.

Air-Flow Control

Steps for setting the airflow control by adjusting a screw to achieve correct burner operation.

Temp-Heat THP-500A Specifications

General

Model	THP-500A
Category	Gas Heater
BTU	50000
Heating Capacity	50000 BTU
Fuel Type	Propane