Schwank STSp-WP - Manual (Page 22)

SP-MSWP-BX-09A
STSp-WP Manual
RD: MAY 2004
RL: 9
KH
Page 18
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. 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 5.0 inches of water
column pressure for natural gas and 11.0
inches of water column pressure for
propane gas. The supply line pressure must
be checked with all the heater(s) operating.
A sealed regulator is supplied with the
heater to maintain the proper manifold pres-
sure when the main burner is operating. See
recommended manifold pressures in table 5
below.
TABLE 5 GAS PRESSURES
GAS TYPE
Line Pressure
Inch Water Column
Minimum Maximum
Natural Gas
Propane 5.0
11.0
14.0
14.0 3.5
10.0
Manifold Pressure
Inch Water Column
At-Tap In Gas Valve
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
pressure.
PLEASE SEE NEXT SECTION ON
HEATER EXPANSION.