Reznor CAUA, Installation Manual

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CP-CAUA-GC (04-21) 170635-A
c. Recheck all manifold connections for gas leaks in accordance with step 5.
7. Measure and adjust manifold (outlet) pressure:
⚠ WARNING ⚠
Manifold gas pressure must never exceed 3.5 IN WC for natural gas or 10 IN WC for propane.
Incorrect inlet pressure could cause excessive manifold gas pressure.
a. Ensure that inlet (supply) pressure is in accordance with Table 5 and determine correct manifold (outlet)
pressure (refer to
Table 5
).
Table 5. Gas Pressure Requirements
Natural Gas Propane
Minimum Maximum Minimum Maximum
Inlet (Supply) Pressure (IN WC)
5.0
*
14.0 11.0
*
14.0
Single-Stage and Two-Stage High-Fire Two-Stage Low-Fire
Natural Gas Propane Natural Gas Propane
Manifold (Outlet) Pressure (IN WC)
3.5 10.0 1.8 5.0
*
Or as stated on the unit rating plate.
b. Turn knob or switch on top of valve to OFF to prevent flow to gas valve.
NOTE: A manometer (fluid-filled gauge) is recommended rather than a spring-type gauge due to
the difficulty of maintaining the calibration of a spring-type gauge. Use a water column manometer
that is readable to the nearest tenth of an inch.
c. Connect manometer to 1/8-inch output pressure tap on valve (see Figure 2 ).
SINGLE-STAGE VALVES
TWO-STAGE VALVE
REGULATOR
SCREW
INLET
PRESSURE
TAP
1/8" OUTLET
PRESSURE
TAP
1/8" OUTLET
PRESSURE
TAP
INLET
PRESSURE
TAP
REGULATOR
SCREW
INLET PRESSURE TAP
1/8" OUTLET PRESSURE TAP
HIGH-FIRE
REGULATOR SCREW LOW-FIRE
REGULATOR SCREW
Figure 2. Gas Valves