DESIGN RELATED SAFETY FEATURES
1) FLAME FAILURE
The electronic ignition control shuts off the gas supply in .8 seconds if flame is lost to prevent
raw gas from leaving the heater.
2) OVERHEATING
The totally enclosed motor is protected by thermal overload. A manual reset high temperature
limit switch is mounted in the heated air stream.
3) LOW SUPPLY VOLTAGE
A panel mounted voltmeter indicates supply voltage before heater start up and also during
heater operation.
4) BLOCKED AIR SUPPLY
An airflow switch detects the differential pressure in the combustion chamber and shuts off
the gas flow when airflow is insufficient.
5) LOCKING GAS SELECTOR LEVER
To avoid over firing of the heater and damage to property, make sure the lever is locked in
position when using propane.
6) LOW SHELL TEMPERATURE
The Model 1800(SL) is designed with a burner heat shield to keep the outside shell cool for
added safety in the work place.
7) DURABLE CONSTRUCTION
The Model 1800(SL) uses a heavy gauge steel housing and a stainless steel burner for long life
and consistent performance.
NOTE: In order to maintain the highly efficient combustion of the heater, the combustion cham-
ber must remain as manufactured. Any change or distortion could alter the fuel/air mixture and
create excessive products of combustion.
SPECIFICATIONS
Model No. 1800 & 1800SL
Designed to ANSI Z83.7-1990 Standard Construction Heater
Gases:
Natural or Propane
Capacity:
750,000 Btu/h maximum
Orifice Size:
36DMS (X18)
Blower:
4,200 CFM
Electrical Rating:
115V 60Hz 15 amps, single phase
Minimum Temperature Rating:
Minus 20 degrees F
Gas Supply:
Inlet Pressure Manifold Pressure
Max PSI
Min PSI
W.C.
Propane
50 lbs.
5 PSI
7.0”
Natural Gas
50 lbs.
5 PSI
7.0”
(Minimum inlet pressure as low as 9.5” W.C. can be achieved by removing 2nd stage 40SV06 regulator)
Inlet Connection:
Weight (approximate):
200 lbs.
Model 1800SL
1/4” FNPT
Duct Part#:
WD2010UTH
Model 1800
3/4” FNPT
Maximum Duct Length Straight:
50 Ft. @ 18” Diameter
4
Summary of Contents for 1800
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