Reznor RDH with 1-stage gas control or 2-stage gas control Gas Conversion Kit Instructions - Manual (Page 5)

Form CP-PREEVA-GC, P/N 212063 R7, Page 5
5. Turn on the electricity and the gas. Relight, following the instructions on the
heater. Check for gas leaks using a commercial leak detecting fluid or a rich soap
and water solution. Leaks are indicated by the presence of bubbles. Check all
connections. If a leak cannot be stopped by tightening, replace the part.
6. Adjust the manifold pressure. Follow these requirements and instructions to
adjust manifold gas pressure.
1) The correct pressure adjustment depends on the area of the country in terms of
elevation. Refer to TABLE 2 and determine the required valve outlet pressure
for the elevation where the heater will be operating. If you don’t know the
elevation, check with your local gas company.
2) Locate the 1/8” output pressure tap on the valve (See FIGURE 4). Turn the
knob or switch on the top of the valve to “OFF”. Connect a manometer to the
1/8” pipe outlet pressure tap in the valve. Use a water column manometer that
is readable to the nearest tenth of an inch.
FIGURE 4 - Top View
of Valves identifying
Pressure Taps and
Adjustment Screws
Single-Stage
Valve
(two styles)
1/8” Outlet
Pressure Tap
Adjust Outlet
Pressure
Inlet
Pressure Tap
Two-Stage Valve
Adjust High
Fire Outlet
Pressure
Adjust Low
Fire Outlet
Pressure
Inlet
Pressure
Tap 1/8” Outlet
Pressure Tap
1/8” Outlet
Pressure Tap
Inlet Pressure Tap
Adjust Outlet Pressure
Applies to Model PDH, SDH, and RDH with Gas Controls listed
Altitude Normal Manifold Pressure (Single-
Stage and Two-Stage High Fire) -
Applies to Options AG1, AG2, AG3,
AG15, AG16
2-Stage Low-Fire Manifold
Pressure - Applies to Options
AG2, AG3, AG15, AG16 FEET METERS
NATURAL PROPANE NATURAL PROPANE
Manifold Pressure Settings (inches w.c.) by Altitude for Installation in the UNITED STATES
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
Manifold Pressure Settings (inches w.c.) by Altitude for Installation in 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
TABLE 2 - Valve Outlet
Pressure Settings by
Elevation, Control
Option, and Fuel Type
3) Single-Stage and Two-Stage High Fire - Turn the knob or switch on the top
of the valve to “ON”. Remove the cap from the pressure adjusting screw and
adjust the gas train pressure to the pressure selected from the table. Adjust
pressure by turning the regulator screw IN (clockwise) to increase pressure or
OUT (counterclockwise) to decrease pressure.
Two-Stage Low Fire - Disconnect the wire from the “HI” terminal on the gas
valve and check the low fire pressure. Turn the regulator screw to adjust
the low fire outlet pressure to the “Low Fire” pressure listed in the table.
Re-connect the wire to the gas valve.
CAUTION
DO NOT bottom
out the gas
valve regulator
adjusting screw.
This can result
in unregulated
manifold pressure
causing excess
overfire and heat
exchanger failure.
4) Turn up the thermostat. (NOTE: On Model SDH, depress and hold the door
safety switch.) Cycle the burner once or twice to properly seat the adjustment
spring in the valve.