Monessen Hearth DIRECT VENT MLDV500 - Manual (Page 30)

30 75D0004
MLDV Series Gas Fireplace MILLIVOLT - CHECKING GAS PRESSURE and ELECTRICAL INSTALLATION
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 immedi-
ately.
. To ease installation, a 4" (610 mm) flex line with
manual shut-off valve has been provided with on
this appliance. Install and attach 1/" 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 50/50
water and soap solution 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  or 3 turns and then place
tubing to pressure gauge over test point. Turn unit
to high. Figure 43 After taking pressure reading,
be sure and turn captured screw clockwise firmly
to reseal. Do not over torque. Check test points for gas
leaks.
FP1979
Millivolt gas valve
FP1979
Figure 43 -
Gas Pressure Check at Gas Valve
Pressure
Test “IN”
Pressure
Test “OUT”
HI/LO Knob
Pilot Adjustment Screw
ELECTRICAL WIRING
Verify proper operation after servicing.
This fireplace will work without any electrical supply. Electricity is only needed to operate
blower.
NOTE: If installed in mobile home, fireplace must be bolted securely to floor.
W
ARNING
Do not use open flame to check for
gas leaks.
W
ARNING
Electrical connections should only be performed
by a qualified, licensed electrician. Main power
must be off when connecting to main electrical
power supply or performing service. All wiring
shall be in compliance with all local, city and
state codes. The appliance, when installed, must
be electrically grounded in accordance with
local codes or in the absence of local codes,
with the National Electrical Code ANSI/NFPA 70
(latest edition) and Canadian Electrical Code,
CSA C22.1.
CAUTION
Label all wires before disconnecting when
servicing controls. Wiring errors can cause
improper and dangerous operation.