Schwank SEM 200-70 Installation And Owner's Manual page 21

DO NOT use pressures greater than 1/2 psig.
to pressure check the heater.
TEST FOR LEAKS:
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".
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
All gas piping and
LINE PRESSURE
INCH WATER COLUMN
MINIMUM MAXIMUM
5.0
11.0
Page 17
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) op-
erating.
Installation of a gas line (trap) "drip leg"
is required at the inlet connection tee fol-
lowing 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.
MANIFOLD PRESSURE
INCH WATER COLUMN
AT-TAP IN GAS VALVE
14.0
14.0
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.
3.5
10.0
GP-MSEM-BX-03B
SEM(U) / IT(U) Manual
RD: Sept, 2005
RL: 03B
KH