47
UEZ-IOM (07-23) 1034347-I
1/8-INCH OUTPUT
PRESSURE TAP
INLET
PRESSURE TAP
REGULATOR SCREW
UNIT SIZES 260 AND 310
UNIT SIZES 055, 085, 110, 130, AND 180
1/8-INCH OUTLET
PRESSURE TAP
INLET
PRESSURE TAP
REGULATOR SCREW
Measure and Adjust Manifold Gas Pressure—Elevation ≤2,000 Feet (≤610 Meters)
For installations at normal elevations, measure and adjust the manifold (outlet) gas pressure as follows:
1. Turn knob or switch on top of valve to OFF to prevent flow to combination gas valve.
NOTE: Use a water column manometer that is readable to the nearest tenth of an inch.
2. Connect manometer to 1/8-inch output pressure tap on valve (see Figure 30).
Figure 30. Combination Gas Valves
3. Open manual valve and operate heater. Depress and hold door safety switch.
4. Cycle burner once or twice to properly seat adjustment spring in valve and observe manometer gauge to measure
outlet pressure of combination gas valve.
⚠ CAUTION ⚠
DO NOT bottom out the combination 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 23, remove cap
from regulator screw(s) (see Figure 30) 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 23, disconnect manometer
and install cap(s) on regulator screw(s).
Table 23. Required Manifold (Outlet) Gas Pressure
Elevation Natural Gas
Unit Size
055, 085, 110, 130, 260 180, 310
Propane
Feet Meters Manifold Pressure (IN WC)
US
0–2000 0–610 3.5 10.0 9.5
2001–3000 611–915 3.1 8.8 8.4
3001–4000 916–1220 3.0 8.5 8.0
4001- 5000 1221–1525 2.8 8.1 7.7
5001–6000 1526–1830 2.7 7.7 7.3
6001–7000 1831–2135 2.6 7.4 7.0
7001–8000 2136–2440 2.5 7.1 6.7
8001–9000 2441–2745 2.4 6.7 6.3
9001–10,000 2746–3045 2.2 6.4 6.0)
Canada
0–2000 0–610 3.5 10.0 9.5
2001–4500 611–1373 2.8 8.1 7.7
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