Temp-Heat THP-400A Handbuch
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.
THP-400A, THP-500A and THP-550 Installation and Service Manual
3
TEMP-HEAT
®
We cannot anticipate every use which may be made of our heaters. Check with your local fire safety
authority if you have questions about applications.
Other standards govern the use of fuel gases and heat-producing products in specific applications.
Your local authority can advise you about these.
Warning
THP-400A, THP-500A and THP-550 Installation and Service Manual
Introduction
The following recommendations are not intended to supplement requirements of federal, state, or
local codes having jurisdiction over the application and operation of this heater.
This instruction booklet contains the necessary information, instructions, and guidelines to achieve
maximum efficiency and safety from the TEMP-HEAT process heater. Please read all instructions
before attempting the set-up and operation of this heater.
The THP-Series Heaters are direct-fired, fresh-air heaters used to provide heat for buildings under
Class B furnaces as defined by NFPA 86 standard for ovens and furnaces. The area of fresh air
required for safe operation must be equal to the area of the unit’s intake grill. THP-Series Heaters
draw fresh outside air through the unit’s intake and discharge tempered air controlled by a remote
sensors. The heaters generate 85° F to 270° F discharge temperatures with models ranging from
300,000 BTU/hour to 4,500,000 BTU/hour operating on natural gas or propane vapor.
Most models are equipped with a remote temperature sensors and an adjustable automatic burner
control. This combination prevents extreme temperature fluctuations that occur when ON/OFF
burner controls are selected.
5
TEMP-HEAT
®
Rating Information
Forindoororoutdoorinstallation
UnitSpecifications THP-400A THP-500A THP-550
CFM 2,500 3,000 3,000
BTU/Hour minimum
maximum
200,000
400,000
44,500
500,000
40,500
550,000
Inlet Pressure
Natural Gas
minimum psig
maximum psig
1/2
4*
1/4
4*
1/2
4*
Inlet Pressure
Propane Gas
maximum psig 10 10 10
Electrical Requirements voltage/hertz/phase/amps 115/60/1/20 115/60/1/20 115/60/1/20
Dimensions l x w x h, in 50 x 26 x 48 58 x 28 x 53 56 x 29 x 40
Weight lbs 450 565 500
Minimum distance from
combustible materials
floor, in
top, in
sides, in
discharge, ft
0
6
6
10
0
6
6
10
0
6
6
10
Ambient Conditions minimum oF
maximum oF
-40
120
-40
120
-40
120
*For inlet pressure over 4-psi natural gas, contact TEMP-AIR.
THP-400A , THP-500A and THP-550 Installation and Service Manual
Control Functions
Airflow Switch Verifies that proper airflow through unit is present before ignition can
take place.
First-Stage Regulator Reduces tank pressure to an intermediate pressure, and supplies inlet
pressure to a second-stage regulator.
Flame-Safety Control Senses flame and shuts down the heater in the event of flame failure.
High-Gas Pressure Switch Measures manifold-gas pressure. If pressure is greater than setpoint,
the switch closes the gas valves.
High-Temperature Limit Opens electric circuit to flame-safety control and closes gas valves in
the event of an overheating condition.
Low-Temperature Limit Protects against the possibility of discharging freezing air into the
building in the event the burner fails to ignite. Pre-set at 40° F, this
control shuts the blower down if the temperature through the unit
drops below this setpoint.
Manual Bypass Switch Over-rides automatic shut-down of the blower during start-up if the
temperature through the unit is below the 40° F setting of the
Low-Temperature Limit control.
Manual Gas Valve Manually shuts off fuel supply at heater. For short-term, shut-down
only.
Modulating Control Valve Regulates gas supply to the burner controlled by the remote
thermostat.
Pilot Valve Supplies fuel to the ignition pilot when starting unit.
Proof-of-Closure Switch Monitors and proves that gas valve is totally closed in the normally
closed position.
Second-Stage Regulator Reduces the outlet pressure from first-stage levels to burner pressure.
Starter Interlock Proves motor-starter is engaged in the normally closed position.
Thermostat Automatically cycles the heater from low- to high-fire to maintain
desired room temperature.
7
TEMP-HEAT
®
Fuel Supply System — Bulk-Tank System
• Installation must comply with all state and local codes or, in the absence of local codes, with the
standard for the Storage and Handling of Liquified Petroleum Gases, ANSI/NFPA 58.
• Locate fuel tanks according to the minimum distances shown in the Rating Information
Table on page 5.
• The vapor-supply fuel line from the tank or vaporizer must have a first-stage regulator located
at the tank or vaporizer to reduce the tank pressure to the 10-psi needed to supply unit.
• A vaporizer may be necessary, especially on multiple-heater installations where adequate storage
supply is not attainable or practicable.
• Vaporizers must be no closer than 10-ft from a container.
• Locate vaporizers at a minimum of 15-ft from fuel-transfer valves.
Typical Vaporizer Installation — Algas 40/40 Vaporizer
EachStorageCapacity
above Ground
Minimum Distance
fromBuilding
one, 500-gal tank 10-ft
one or two, 1000-gal tanks 25-ft
2001-gal or more 50-ft
THP-400A, THP-500A and THP-550 Installation and Service Manual
Set-Up
• Keep fresh-air intake and heated-air discharge clear of obstruction.
• Provide clearance to allow access to vestibule, blower, and motor compartments.
• Heater must be level and in compliance with minimum-clearance and minimum-distance
requirements for combustible materials. See Rating Information Table on page 5.
• Position heater to draw 100% fresh, outside air through its intake grill.
• Do not use or operate the heater in the presence of combustible vapors or liquids.
• Maintain a maximum voltage differential of plus or minus 10% while unit is running.
• Do not move, handle, or service heater while hot, running, or connected to power supply.
• Check for gas leaks and proper functioning during installation, periodically, or when relocating.
Typical Heater Installation
Natural Gas Installations
• See Rating Information Table on page 5 for proper inlet pressure.
• Use external regulator supplied on all installations over 4-psi.
• Gas meter and supply system must be able to supply the minimum supply pressures as specified
in the Rating Information Table on page 5.
• Follow all federal, state, and local codes governing temporary-gas connections.
• Leak test all gas connections using a 1:3 solution of soap and water.
9
TEMP-HEAT
®
Preliminary Start-Up Steps
• Check for proper fuel-supply application, connections, and pressure.
• Check that external regulator has been installed on all natural-gas installations over 4-psi.
• External regulator must be installed on unit on all propane installations.
• Purge gas line of air, as necessary.
• Leak test all gas connections with a 1:3 solution of soap and water.
• Do not operate unit if leaks are present.
• Determine that unit is drawing 100% fresh outside air through its intake grill.
• Check for proper electrical connections and supply voltage.
• Check that the intake and discharge of unit are free from obstructions.
• Reset flame-safety control by pressing reset button on control.
• Reset motor overload.
• Check control settings:
high-temperature limit switch: 270° F
low-temperature limit switch: 40° F
THP-400A Switch Panel
THP-550 Switch Panel
THP-500A Switch Panel
Note: Other switch panel layouts may be
used depending on application.
THP-400A, THP-500A and THP-550 Installation and Service Manual
THP-400A Vestibule Layout
Control Vestibule Layout
THP-500A Vestibule Layout
Dieses Handbuch passt für folgende Modelle
2
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