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DO NOT use pressures greater than 1/2 psig. to
pressure check the heater.
TEST FOR LEAKS: All gas piping and connec-
tions must be tested for leaks after the installation
is completed.
Apply soap suds solution to all connections and
joints and if bubbles appear, leaks have been de-
tected and must be corrected. DO NOT USE A
MATCH OR OPEN FLAME OF ANY KIND
TO TEST FOR LEAKS. NEVER OPERATE
THE HEATER WITH LEAKING CONNEC-
TIONS.
The supply system should be checked first with
heater turned "OFF" followed by another check
with heater turned "ON".
TABLE 5
GAS TYPE
Natural Gas
Propane
NOTE: Access to the manifold pressure test port is
on the top of the valve. A 3/16" Allen Wrench is
necessary to check this. When checking or setting
the manifold pressure, a water manometer
should
be
used. Gauges which measure in
IMPORTANT:
The minimum supply-line pressure at the inlet
to the heater regulator must not, in any in-
stance, be lower than 5.5 inches of water col-
umn pressure for natural gas and 11.0 inches
of water column pressure for propane gas. The
supply line gas pressure must be checked with
all the heater (s) operating.
Installation of a gas line (trap) "drip leg" is
required at the inlet connection tee following
the pipe drop to the heater. Failure to provide
a "drip leg" could result in condensation and
foreign matter passing into the gas valve. Fail-
ure to install a "drip leg" in the gas line will
void the warranty.
LINE PRESSURE
INCH WATER COLUMN
MINIMUM MAXIMUM
5.0
14.0
11.0
14.0
ounces per square inch or pounds per square inch
are not accurate enough to properly measure or set
the pressure. PLEASE SEE NEXT SECTION ON
HEATER EXPANSION.
Page 20
MANIFOLD PRESSURE
INCH WATER COLUMN
AT-TAP IN GAS VALVE
3.5
10.0
GP-MSJV-BX-07A
STV-JZ Manual
RD: MAR 2009
RL: 07A - BA
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