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9. GAS SUPPLY PIPING
WARNING
Do not install any gas piping or wiring in the heat zone directly above the heater.
Do not subject heater controls to leak test pressures when checking the main supply piping.
A. Gas piping must be sized to provide adequate input capacity to all heaters and appliances
in the system and at the pressure indicated in Table 3 below.
IMPORTANT: Minimum supply line pressure at the inlet to the heater regu-
lator must not be lower than 6.0 inches of water column pressure for natu-
ral gas and 11" w.c. for propane. The gas supply pressure must be
checked with all heaters in operation.
B. Provide a 1/8 in (3.2 mm) NPT plugged tapping, accessible for test gauge connection, im-
mediately upstream of the gas supply connection to the heater.
C. It is recommended to install an approved flexible connector between the heater and gas
piping - available as option from Schwank or from your local supplier.
D. A drip-leg prior to the inlet connection to the heater must be provided in the gas line.
E. On propane-fired units, a main line filter is recommended.
F. Piping joint compounds must be resistant to the action of natural gas or LPG
G. TEST FOR LEAKS: 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. Leak test according to local or national codes.
DO NOT use pressure greater than 1/2 psig to pressure check the heater.
The supply system should be checked first with heater turned "OFF" followed by another
check with heater turned "ON".
WARNING
This heater may be field converted from one fuel gas to another (natural gas to or
from LPG). Conversion must be accomplished with a kit available from the manu-
facturer. Contact your local distributor for the kit that is specific to the model in-
stalled (SEE PAGE 31). Conversion may include changing of the air restrictor as
well as the orifice and gas valve spring. Follow the instructions supplied with the
conversion kit.
Gas conversion must only be done by a trained gas service technician, according
to all local and national codes. Incorrect conversion may result in fire, explosion,
property damage, injury or death
SP-MECX-EX-5A
ECO-X 36-52 / IL-X 150-200 Manual
RD: MAY 2009
RL: 05A - BA
Install and connect gas lines in accordance with lo-
cal, state, provincial and national codes (ANSI
Z223.1/NFPA 54 in USA; B149.1 in Canada).
Incorrect installation and connection
may results in fire, explosion, property damage, in-
jury or death
GAS CONVERSION
14
of gas lines
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