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)
6
CP-UB-UD-GC (04-21) 1034364-A
INSTALLATION—CONTINUED
⚠ DANGER ⚠
• The air restrictor plate MUST BE INSTALLED when converting unit sizes 030, 045, 060, 075, 100,
and 150 (all models) and unit size 125 (models UDBP, UDBS, UBX, and UBZ) to propane.
• The air restrictor plate MUST BE REMOVED when converting unit sizes 030, 045, 060, 075, 100,
and 150 (all models) and unit size 125 (models UDBP, UDBS, UBX, and UBZ) to natural gas.
• For these models/unit sizes, the failure to install or remove the air restrictor plate in accordance
with the following directions can cause death or injury and/or property damage.
b. For unit sizes 030, 045, 060, 075, 100, and 150 (all models) and unit size 125 (models UDBP, UDBS, UBX,
and UBZ), proceed to step c. For all other models/unit sizes, proceed to step e.
c. If converting from propane to natural gas, remove air restrictor plate as follows. If converting from natural gas
to propane, install air restrictor plate in accordance with step d.
(1) See Figure 2, DETAIL B to locate air restrictor plate held in place on venturi tube by its bent tabs.
(2) Use pliers to carefully unbend tabs as shown in Figure 2, DETAIL A and remove air restrictor plate.
d. For natural gas to propane conversion, install air restrictor plate as follows:
(1) Refer to Table 1 or Table 2 to select correct air restrictor plate. Slide plate in place over venturi tube
opening so that its 45-degree angle is hooked over rear of venturi tube (see Figure 2).
(2) While holding plate in position, use pliers to carefully bend tabs to lock plate in place (see Figure 2, DETAIL
B). Ensure that air restrictor is aligned and secure.
e. For all conversions, select replacement burner orifices in accordance with Table 3. All conversion kits include
two or three burner orifices. Other included orifice(s) will not be used.
Table 3. Burner Orifices
Unit Size Model
Natural Gas Propane
Orifice Size/Marking (PN)
030
UDAP, UDAS, UDBP, UDBS #37 (196853)
1.6 mm (196844)
UBX, UBZ, UDX, UDZ #39 (196852)
045
UDAP, UDAS, UDBP, UDBS #30 (196838)
#48 (196845)
UBX, UBZ, UDX, UDZ 3.1 mm (120144)
060
UDAP, UDAS, UDBP, UDBS 3.7 mm (196839) 2.3 mm (196846)
UBX, UBZ, UDX, UDZ #28 (124969) 2.25 mm (1034350)
075
UDAP, UDAS, UDBP, UDBS #19 (196855) #39 (196852)
UBX, UBZ, UDX, UDZ #22 (196361) #40 (120137)
100
UDAP, UDAS, UDBP, UDBS #10 (120158) 3.0 mm (196854)
UBX, UBZ, UDX, UDZ #14 (208247) #32 (120141)
125
UDAP, UDAS, UDBP, UDBS #4 (196840) 3.2 mm (196847)
UBX, UBZ, UDX, UDZ #10 (120158) 3.1 mm (120144)
150
UDAP, UDAS, UDBP, UDBS 5.9 mm (131581) 9/64-inch (196898)
UBX, UBZ, UDX, UDZ 5.6 mm (208243) 3.5 mm (120148)
175
UDAP, UDAS, UDBP, UDBS E (196891) #24 (196899)
UBX, UBZ, UDX, UDZ 6.0 mm (208245) #27 (120149)
200
UDAP, UDAS, UDBP, UDBS 6.8 mm (196892)
4.1 mm (196900)
UBX, UBZ, UDX, UDZ F (120167)
225 All 6.95 mm (221121) 11/64 inch (196901)
250
UDAP, UDAS, UDBP, UDBS
L (208255)
#14 (196902)
UBX, UBZ, UDX, UDZ 4.60 mm (1034352)
300
UDAP, UDAS, UDBP, UDBS 8.0 mm (221122)
#8 (196903)
UBX, UBZ, UDX, UDZ 7.8 mm (208253)
350
UDAP, UDAS, UDBP, UDBS 8.7 mm (221123) #3 (196904)
UBX, UBZ, UDX, UDZ 8.5 mm (1034354) 5.4 mm (1034353)
400
UDAP, UDAS, UDBP, UDBS 9.6 mm (196897)
5.8 mm (196905)
UBX, UBZ, UDX, UDZ 9.2 mm (1034355)