RSD Series Installation Guide

Form #43219040

Jan 2014

9) INSTRUCTIONS FOR PRESSURE TEST GAUGE CONNECTION

SUPPLY PRESSURE

1. The installer will provide a 1/8” N.P.T. plugged tapping, accessible for test gauge connection immediately

upstream of the gas supply connection to the heater.

OUTLET GAS PRESSURE CHECK AND ADJUSTMENTS (HONEYWELL 1-STAGE GAS VALVES)

1. Turn the gas valve to the “OFF” position. Remove the 1/8” plug from the combination gas valve at the outlet

pressure tap and connect a 1/8” N.P.T. nipple to the tapped hole. Connect gauge to nipple. Turn on the gas

supply.

Model Suffix 1C

2. With the main burner operating, check the burner manifold pressure using a water manometer. Gauges that

measure pressure in pounds per square inch are not accurate enough to measure or set the manifold

pressure. Use a water manometer or a gauge calibrated in inches of water column. All measurements MUST

BE made when this heater and all other gas burning equipment that is connected to the gas supply system are

operating at maximum capacity.

3. The combination gas valve is factory set and should not require adjustment. If full rate adjustment is required,

remove the cover screw. Using a small screwdriver, turn the adjustment screw clockwise  to increase or

counterclockwise  to decrease the gas pressure to the burner. Replace the cover screw.