Schwank STR-JZ - Manual (Page 30)

30
STR-JZ I&O Manual
IM090831
RD: AUG 2009
RL: 09A- BA
13. GAS SUPPLY - HEATER EXPANSION - FLEXIBLE GAS CONNECTION
The gas supply must be installed to the heater using:
 USA : an approved Stainless Steel Flexible Gas Connector certified for use on an infrared
radiant tube heater (ANSI Z21.24 CSA 6.10);
 CANADA : an approved Type 1 Hose Gas Connector (CAN/CGA 8.1).
 The heater must be isolated from the gas supply piping system by closing its individual
manual shut off valve (field supplied) during any pressure testing of the gas supply piping
system.
CAUTION:
Compensation for normal gas supply pipe expansion, and radiant tube heater
expansion must be provided. All piping must conform to local codes— Refer to
next two pages
Provide a 1/8 in (3.2 mm) NPT plugged tapping, accessible for test gauge
connection, immediately upstream of the gas supply connection to the heater.
DO NOT use pressure 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: Minimum supply line pressure at the inlet to the heater
regulator must not be lower than 5.0 inches of water column pressure for
natural gas. The supply gas pressure must be checked with all heaters in
operation.
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. Failure to install a
“drip leg” in the gas line can cause property damage, injury or death and will void
the heater warranty.
TABLE 4
GAS TYPE
LINE PRESSURE
INCHES WATER COLUMN
MANIFOLD PRESSURE
(tap at gas valve outlet)
INCHES WATER COLUMN
MINIMUM MAXIMUM
Natural Gas 5.0 14.0 3.5