Install Instructions

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I-UBX-UBZ-UDX-UDZ (04-21) 1034344-0
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 21. Required Manifold (Outlet) Gas Pressure
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
0–2000 0–610 3.5 10.0 1.8 5.0
2001–3000 611–915 3.1 8.8 1.6 4.4
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
Canada
0–2000 0–610 3.5 10.0 1.8 5.0
2001–4500 611–1373 2.8 8.1 1.5 4.1
ADJUSTMENTS—CONTINUED
Measure and Adjust Manifold (Outlet) Gas Pressure—Continued
Figure 15. Gas Valves
⚠ CAUTION ⚠
DO NOT bottom out the gas valve regulator screw. This can result in excessive overfire and heat
exchanger failure due to unregulated manifold pressure.
5. If manometer reading does not indicate that valve outlet pressure is in accordance with Table 21, remove cap
from regulator screw(s) (see Figure 15) 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 21, disconnect manometer
and install cap(s) on regulator screw(s).