Gas Conversion Guide
Table Of Contents
- GAS CONVERSION KIT INSTALLATION FOR UNIT HEATERS (MODELS UDBP AND UBX: STANDARD POWER VENT BLOWER TYPE, MODELS UDBS AND UBZ: SEPARATED-COMBUSTION BLOWER TYPE, MODELS UDAP AND UDX: STANDARD POWER VENT FAN TYPE, AND MODELS UDAS AND UDZ: SEPARATED-COMBUSTION FAN TYPE)
5
CP-UB-UD-GC (04-21) 1034364-A
(unit sizes 030–125)
Separated Com-
bustion Units
have a collar
here for the
combustion air
pipe (not shown)
Interlock Door
Switch: Separated
Combustion Units
Electric Box:
UDAS and UDBS
models ONLY
Disconnect Switch:
Separated Combus-
tion units ONLY
Figure 1. Heater Components
2. Install regulator spring kit:
⚠ WARNING ⚠
Regulator spring kits are not interchangeable. Each kit must be used only in the model and type of
gas valve for which the kit is designated. Verify compatibility before installing the regulator spring kit.
a. Select regulator spring kit that corresponds with gas valve on heater. All gas conversion kits include one or
two regulator spring kits for single-stage valve and one regulator spring for two-stage valve. Other included
regulator spring kits will not be used.
b. Install regulator spring kit in accordance with gas valve manufacturer’s instructions (included with regulator
spring kit).
NOTE: After a new regulator spring kit is installed, it is necessary to adjust the spring for correct
manifold pressure. This adjustment can be made only after the heater is in operation (refer to step 7).
3. Remove or install air restrictor plate as necessary and replace burner orifice:
a. Carefully remove existing burner orifice (see Figure 2, DETAIL A).
DETAIL A DETAIL B
AIR RESTRICTOR PLATE
*
BURNER
ORIFICE
TABS NOT BENT
AIR RESTRICTOR
PLATE INSTALLED
(TABS BENT)
VENTURI TUBE
*
USED ONLY ON UNIT SIZES 030, 045, 060, 075, 100, AND 150 (ALL PROPANE MODELS) AND UNIT SIZE
125 (PROPANE MODELS UDBP, UDBS, UBX, AND UBZ).
Figure 2. Burner Orifice and Air Restrictor Plate