Specifications

13

NBST27 Unvented Gas Log Set









          
Figure 13
 A qualified gas appliance installer must connect
the heater to the gas supply. Consult all local codes.
 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.
FP2371
gas connect
To
Heater Valve
Pipe
Possible Locations
for Pressure Tap-
ping Point
Gas
Supply
Inlet
Manual Shut-off Valve
Pipe Coupling
Stainless Flex-
ible Tube, Pipe
or Metal Tube
FP2371
Figure 13 -
Gas Connection







    
     

The heater gas inlet connection is a female 3/8" NPT at
the valve. The inlet connection is on the right side of unit
when facing the control. To connect from the opposite side,
rotate unit 180° or route the pipe under the rear portion of
the unit.
When tightening the joint to the valve, hold the valve
securely to prevent movement.
Test all gas connection from the gas meter to the heater
valve for leaks using a gas analyzer or soap and water
solution after completing connection.  

Check the gas pressure with the appliance burning and
the control set to .

The valve regulator controls the burner pressure which
should be checked at the pressure 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). After taking
pressure reading, be sure and turn captured screw clock-
wise firmly to re-seal. Do not over torque. Check for gas
leaks.
Repeat process for “IN” port. Check “IN” port with unit set
on high with any other gas appliances in the house on or
cycling on. Pressure gauge readings should match max/min
requirements on data plate.
FP2372
millivolt valve
Test Port “OUT”
Figure 14 -
Pressure Test Point Location
Millivolt Control
FP2372