Check Gas Pressure - Millivolt; Electrical Wiring - Monessen Hearth MDV500, MDV600 Installation & Operating Instructions Manual

MDV Series Direct Vent Gas Fireplace
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" (457 mm) 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. Figure 47. 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.
electrIcal wIrIng
This fireplace will work without any electrical supply except
to operate blower and electronic ignition system.
note: If installed in mobile home, fireplace must be bolted
securely to floor.
electrical co nne c t ions s hould on l y
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.
30
checK gas pressure and electrIcal InstallatIon - mIllIVolt
Pressure
Test "IN"
Pressure
Test "OUT"
HI/LO Knob
Pilot Adjustment Screw
Figure 47 -
Gas Pressure Check at Gas Valve
FP1979
do not use open flame to check for gas
Millivolt gas valve
leaks.
label all wires before disconnecting when
servicing controls. wiring errors can cause
improper and dangerous operation.
Verify proper operation after servicing.
FP1979
75D2523