Space-Ray PCA-SS 100, Assembly, Installation And Operation Instructions, Page: 28 / 62

Form 43343110
May 2021
-27-
12.0) INSTRUCTIONS FOR PRESSURE TEST GAUGE CONNECTION
SUPPLY PRESSURE
1. The installer will provide a 1/8” N.P.T. tapped plug, accessible for test gauge connection immediately
upstream of the gas supply connection to the heater.
OUTLET GAS PRESSURE CHECK AND ADJUSTMENTS
Gauges that measure pressure in pounds per square inch are not accurate enough to measure or set the
manifold pressure. All measurements MUST BE made when the heater and all other gas burning equipment that
are connectied to the gas supply system are operating at maximum capacity. The combination gas valve is
factory set and should not need adjustment. If gas pressure adjustment is required, follow the instructions:
1.
Turn off all electrical power to the system to connect manometer hoses.
2. Turn the pressure test screw (3/32” Hex) in the center of the boss not more than one turn counterclockwise.
Attach a 5/16” hose and manometer ove r the tapered outlet pressure boss on the valve (see Figures 1 and 2
below). If regulator needs to be adjusted, see instructions below.
TO ADJUST REGULATOR (single stage gas valves):
1. Turn on power and energize the main gas valve. Remove regulator cover screw (see Figure 1 below). Turn
regulator adjustment screw clockwise

to increase presure, or counterclockwise

to decrease pressure.
Replace regulator cover screw and tighten securely.
DO NOT EXCEED THE PRESSURES SHOWN IN THE GAS PRESSURE TABLE.
2.
After testing pressure and adjusting the regulator, turn off all electrical power to the system, remove
ma
nometer hoses, turn outlet test screw (3/32” Hex) clockwise to seal press ure port. Tighten to 7 in lb
minimum. Turn on system power.