Monessen Hearth DLX28 - Manual (Page 20)

20 14D2099
CHECKING GAS PRESSURE
W
ARNING
Connecting directly to an
unregulated propane/LPG
tank can cause an explosion.
NPT Test Plug
Test Port “OUT”
Test
Points
Test all gas joints from the gas meter to the heater valve for leaks using a gas analyzer or soap and water solution after
completing connection.
DO NOT USE AN OPEN FLAME.
Check the gas pressure with the appliance burning and the control set to HIGH .
MANUAL CONTROL (Figure 16)
The pressure regulator is preset and locked to discour-
age tampering. If the pressure is not as specified, re-
place the regulator with the correct part from the parts
list in this manual.
Remove 1/8" NPT plug, located on either side of regu-
lator body. Install fitting and tubing to pressure gauge.
After taking pressure reading, reinstall test plug. Check
for gas leaks.
THERMOSTAT CONTROL (Figure 17)
Turn captured screw counter clockwise two or three
turns and then place tubing to pressure gauge over test
point (Use test point closest to control knob). After tak-
ing pressure reading, be sure and turn captured screw
clockwise firmly to reseal. Do not over torque. Check
for gas leaks.
MILLIVOLT CONTROL (Figure 18)
The valve regulator controls the burner pressure which
should be checked at the pressure test point.
Turn captured screw counter clockwise two or three
turns and then place tubing to pressure gauge over test
point. (Use test point “OUT” closest to gas inlet). Af-
ter taking pressure reading, be sure and turn captured
screw clockwise firmly to reseal. Do not over torque.
Check for gas leaks.
Figure 16 - Pressure Test Point Location
Figure 17 - Alternate Test Point Location for Thermostat
Control Unit
Figure 18 - Pressure Test Point Location
The heater gas inlet connection is a 3 /
8
" NPT at the valve. On all
control type units, the inlet connection is on the right side of the
unit. To connect from the opposite side, route the pipe under the
rear portion of the unit.
When tightening up the joint to the valve, hold the valve securely to
prevent movement.