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EYF Series Unvented Gas Log Set
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
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.
Stainless
Flexible
Tube
To
Heater
Valve
Pipe
Coupling
Manual Shutoff
Valve
Figure 13 -
Gas Connection
FP2371
gas connect
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.
12
Monessen • EYF18/24 Gas Log Heater Installation/Owner's Manual • 65D1009 • Rev G • 01/2020
Pipe
Possible Locations
for Pressure
Tapping Point
Gas
Supply
Inlet
FP2371
Connecting directly to an unregulated
propane/LPG tank can cause an explo-
sion.
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, located on side of regulator body.
NPT Test Plug
Figure 14 -
Pressure Test Point Location for
Manual Control
MILLIVOLT CONTROL
FP2499
Figure 15
manual valve
The valve regulator con-
trols the burner pressure
which should be checked
at the pressure test
point.
Turn captured screw
counter clockwise
two or three turns
a n d t h e n p l a c e
tubing to pressure
gauge over test point
(Use test point "OUT"
closest to control
Figure 15 - Pressure Test Point Location
knob). After taking
Millivolt Control
pressure reading,
be sure and turn
captured screw clockwise firmly to re-seal. Do not over
torque. Check for gas leaks.
GAS LINE CONNECTION
Install fitting and tubing to
pressure gauge. After taking
pressure reading, reinstall
test plug. Check for gas
leaks.
FP2499
Test Port "OUT"
FP2372
FP2372
millivolt valve
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