Schwank STSp-CANADA User Manual
Page 23
SP-MSTP-AC-15A
STS-p Manual
RD: DEC, 2003
RL:15
KH
Page 19
DO NOT use pressures greater than 1/2 psig.
to pressure check the heater.
TEST FOR LEAKS: All gas piping and
connections 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 detected 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 CONNECTIONS.
The supply system should be checked first
with heater turned "OFF" followed by
another check with heater turned "ON".
IMPORTANT:
The minimum supply-line pressure at the
inlet to the heater regulator must not, in
any instance, be lower than 5.5 inches of
water column 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 follow-
ing the pipe drop to the heater. Failure to
provide a “drip leg” could result in con-
densation and foreign matter passing into
the gas valve. Failure to install a “drip leg”
in the gas line will void the warranty.
TABLE 5
GAS TYPE
LINE PRESSURE
INCH WATER COLUMN
MINIMUM MAXIMUM
MANIFOLD PRESSURE
INCH WATER COLUMN
AT-TAP IN GAS VALVE
Natural Gas
Propane
5.0 14.0
11.0 14.0
3.5
10.0
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 ounces per square inch or
pounds per square inch are not accurate
enough to properly measure or set the pres-
sure. PLEASE SEE NEXT SECTION ON
HEATER EXPANSION.