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UBXC-UDXC-IOM (01-24) 1042980-0
Figure 22. Combination Gas Valves
SINGLE-STAGE VALVES
TWO-STAGE VALVE
REGULATOR
SCREW
INLET
PRESSURE
TA P
1/8" OUTLET
PRESSURE
TA P
1/8" OUTLET
PRESSURE
TA P
INLET
PRESSURE
TA P
REGULATOR
SCREW
INLET PRESSURE TA P
1/8" OUTLET PRESSURE TA P
HIGH-FIRE
REGULATOR SCREW
LOW-FIRE
REGULATOR SCREW
Table 22. Required Manifold (Outlet) Gas Pressure
Installation
Location
Elevation
Single-Stage and Two-Stage High-
Fire
Two-Stage Low-Fire
Feet Meters
Natural Gas Propane Natural Gas Propane
Manifold Pressure (IN WC)
US, Canada 0–2000 0–610 3.5 10.0 1.8 5.0
US 2001–3000 611–915 3.1 8.8 1.6 4.4
Canada 2001–4500 611–1373 2.8 8.1 1.5 4.1
US
3001–4000 916–1220 3.0 8.5 1.5 4.2
4001- 5000 1221–1525 2.8 8.1 1.5 4.1
5001–6000 1526–1830 2.7 7.7 1.4 3.9
6001–7000 1831–2135 2.6 7.4 1.3 3.7
7001–8000 2136–2440 2.5 7.1 1.3 3.5
8001–9000 2441–2745 2.4 6.7 1.2 3.4
9001–10,000 2746–3045 2.2 6.4 1.2 3.2
Measure and Adjust Manifold Gas Pressure—Elevation >2,000 Feet (>610 Meters)
For installations at high elevations, measure and adjust the manifold (outlet) gas pressure as follows:
1. If installation is at elevation >6,000 feet (1,830 meters), replace pressure switch in accordance with Pressure
Switch Replacement section.
⚠ WARNING ⚠
Manifold gas pressure must never exceed 3.5 IN WC for natural gas or 10 IN WC for propane.
2. Determine correct outlet pressure (refer to Table 22) for elevation of installation. If unsure of elevation, contact
local gas supplier.
3. Turn knob or switch on top of valve to OFF to prevent flow to gas valve.
5. If manometer reading does not indicate that valve outlet pressure is in accordance with Table 22, remove cap
from regulator screw(s) (see Figure 22) and adjust pressure by turning regulator screw IN (clockwise) to increase
pressure or OUT (counterclockwise) to decrease pressure.
6. When manometer reading indicates that outlet pressure is in accordance with Table 22, disconnect manometer
and install cap(s) on regulator screw(s).
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