DESIGN RELATED SAFETY FEATURES
1) FLAME FAILURE
The electronic safeguard 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 a manual reset thermal overload. A high
temperature limit switch is mounted in the control box.
3) COMPLETE VISUAL/SELF DIAGNOSIS LIGHTS
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 1800B(L) 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 1800B(L) 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. 1800B & 1800BL
Designed to ANSI Z83.7-1993 Standard Construction Heater
Gases:
Natural or Propane
Capacity:
750,000 Btu/h maximum, 450,000 Btu/h minimum
Orifice Size:
36 DMS (x18)
Blower:
4,200 CFM
Electrical Rating:
120V 60Hz 15 amps, single phase
Minimum Temperature Rating:
Minus 20 degrees F
Gas Supply: Inlet Pressure
Hi Fire
Lo Fire
Max PSI
Min PSI
W.C.
W.C.
Propane
50 lbs.
2
8.25”
3”
Natural Gas
50 lbs.
2
8”
3”
(Minimum inlet pressure as low as 9.5” W.C. can be achieved by removing 2nd stage 40SV06 regulator)
Inlet Connection:
Maximum Duct Length Straight:
50 ft @ 20” diameter
Model 1800BL
1/4” FNPT
Model 1800B
3/4” FNPT
Weight (approximate):
200 lbs.
4
Summary of Contents for 1800B(L)
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