Monessen Hearth Direct Vent Gas Fireplace MDV500 - Manual (Page 30)

30 75D2523
CHECKING GAS PRES SURE
1. Check gas type. The gas supply must be the same as
stated on the appliance’s rating decal. If the gas supply
is different from the fireplace, STOP! Do not install
the appliance. Contact your dealer immediately.
2. To ease installation, a 18" (457mm) flex line with
manual shut-off valve has been provided with on this
appliance. Install and attach
1 /
2
" gas line onto shut-off
valve.
3. After completing gas line connection, purge air from
gas line and test all gas joints from the gas meter to
the fireplace for leaks. Use a solution of 50/40 water
and soap or a gas sniffer.
4. To adjust flame height, turn HI/LO knob to HI to get
maximum pressure to burner. Turn HI/LO knob to LO
to get minimum pressure.
5. To check gas pressures at valve, turn captured screw
counter clockwise 2 or 3 turns and then place tubing to
pressure gauge over test point. Turn unit to high. See
Figure 39. After taking pressure reading, be sure and
turn captured screw clockwise firmly to reseal. Do not
over torque. Check test points for gas leaks.
NOTE: Captured screws for pressure reading are
located in the same place in both valve
types — Millivolt and Electronic.
Figure 39 - Gas Pressure Check at Gas Valve
(Millivolt Valve Shown)
Pressure
Test “IN”
Pressure
Test “OUT”
HI/LO
Knob
Pilot Adjustment
Screw
WARNING
Do not use open flame
to check for gas leaks.