Monessen Hearth EYF18 - Manual (Page 12)

65D1009 1
EYF Series Unvented Gas Log Set
NOTICE: A qualified gas appliance installer must connect
the heater to the gas supply. Consult all local codes.
IMPORTANT: Hold heater valve firmly with a wrench to
prevent movement when connecting to inlet pipe.
Always use an external regulator for all propane/LPG
heaters and high pressure one to two-pound systems
only, to reduce the supply tank pressure to a maximum of
13" w.c. This is in addition to the internal regulator in the
heater valve.
GAS LINE CONNECTION
W
ARNING
Use new black iron or steel pipe. Internally tinned copper or copper tubing can
be used per National Fuel Code, section 2.6.3, providing gas meets hydrogen
sulfide limits, and where permitted by local codes. Gas piping system must be
sized to provide minimum inlet pressure (Listed on Data Plate) at the maximum
flow rate (BTU/Hr). Undue pressure loss will occur if the pipe is too small.
A manual shutoff valve must be installed upstream of the appliance. Union tee
and plugged 1/8" NPT pressure tapping point should be installed upstream of
the appliance. Figure 13
FP2371
gas connect
Stainless
Flexible
Tube
Pipe
Possible Locations
for Pressure
Tapping Point
Gas
Supply
Inlet
To
Heater
Valve
Pipe
Coupling
Manual Shutoff
Valve
FP371
Figure 13 -
Gas Connection
CHECk GAS TYPE: The gas supply must
be the same as stated on the heater’s rat-
ing plate. If the gas supply is different, DO
NOT INSTALL THE HEATER. Contact your
dealer for the correct model.
Connecting directly to an unregulated
propane/LPG tank can cause an explo-
sion.
W
ARNING
W
ARNING
The heater gas inlet connection is a 3/8" NPT at the valve.
All units have the inlet connection on the right side, when
you face 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.
MANUAL CONTROL
Figure 14
The pressure regulator is preset and locked to dis-
courage tampering. If the pressure is not as specified,
replace the regulator with the correct part from the parts
list in this manual.
Remove 1/8" NPT plug, locat-
ed on side of regulator body.
Install fitting and tubing to
pressure gauge. After
taking pressure reading,
reinstall test plug.
Check for gas
leaks.
FP2499
manual valve
NPT Test Plug
FP499
Figure 14 -
Pressure Test Point Location for
Manual Control
MILLIVOLT CONTROL
Figure 15
The valve regulator con-
trols the burner pressure
which should be
checked at the pres-
sure 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 control knob). Af-
ter taking pressure
reading, be sure and turn captured screw clockwise firmly
to re-seal. Do not over torque. Check for gas leaks.
Figure 15 - Pressure Test Point Location
Millivolt Control
FP2372
millivolt valve
Test Port "OUT"
FP37