
A_GC_SM_HDGASCOUNTERSERV_GT-UT-SERIES (Rev 1)
Page 17
Gas Pressure Regulator
Rear Gas Pressure Regulator Connection Options
• Pipe
size
: 3/4” (19.05mm) NPT for all models.
Ther are two options to connent a Gas Pressure Regulator, as shown in Figure 2 and Figure 3 below. Refer to
Installation and Operation Manual for further details
Figure 2:
Gas pressure regulator connection is designed to
flush-mount.
Note: when installing as a flush mount gas pressure
regulator connection, (to allow for equipment
installation against a noncombustible wall), a
certified flexible gas hose and quick disconnect
assembly is required to allow the unit to be moved in
the event an adjustment of the gas pressure regulator
is required.
Figure 2
Figure 3:
Gas pressure regulator connection is designed
straight through.
Garland recommends the use of certified flexible gas
hose and quick disconnect assembly to allow the unit
to be moved in the event an adjustment of the gas
pressure regulator is required.
Figure 3
Purpose of gas pressure regulator
Basics Of A Gas Pressure Regulator
Inlet
Outlet
At
m
ospheric
Re
m
ovable Seal Cap
Vent
Adjust
m
ent (Screw)
Loading Ele
m
ent
(Spring)
Measuring Ele
m
ent
(Diaphrag
m
)
Restricting Ele
m
ent
(Valve Disk and Seat)
Gas pressure regulators have two main purposes, to
reduce supply main pressure to safe operating pressures
of connected appliances and to maintain constant
downstream pressure, regardless of changes in the gas
flow or upstream pressure variations.
Note:
Gas service suppliers usually supply gas pressure
higher than the safe operating pressures of connected
appliances.
If an appliance receives too much fuel, it will over-fire. If
it receives too little fuel, it will under-fire. It will produce
too much or too little heat. Combustion characteristics
could change resulting in carbon monoxide generation.
The appliance may not work properly or efficiently.
Note:
Always refer to the rating plate of appliance for actual manifold pressure required.