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2.6 VENTILATION REQUIREMENTS
Canada: Codes require that an unvented heater be electrically interlocked to an independent exhaust
fan by means of an Air Proving Switch. The exhaust fan must be sized to provide 3 cfm for every
1000 Btu/hr or fraction thereof, of total input of installed equipment. Consult CSA.B149.1 latest edi-
tion for requirements.
USA: When a heater is installed unvented the system requires the exhausting of at least 4 cfm per
1000 Bth/hr on NG, and 4.5 cfm per 1000 Btu/hr for LP. By natural or mechanical means, or electri-
cally interlocked to an independent exhaust fan, for the total input of all heaters installed. Exhaust
openings for removing flue products shall be above the level of the heaters.. Consult your state and
local codes and ANSI Z223.1 latest edition.
2.7 GAS SUPPLY LINE INSTALLATION
A. All piping must be installed according to local codes.
B. It is recommended to install an approved flexible connector between the heater and gas piping
available as option from Schwank.
C. A drip-pocket at the inlet connection must be provided.
D. On propane-fired units, a main line filter is recommended.
E. Piping joint compounds must be resistant to the action of liquefied petroleum gases.
F. All piping joints should be tested for leaks with a soap and water solution.
Do not install any gas piping in heat zones. Do not subject heater
CAUTION:
controls to leak test pressures when checking the main supply piping.
2.8 GAS PRESSURE
The maximum supply pressure must be limited to 14" W.C. (0.51 psi). If the line pressure is above
14" W.C., then a separate pressure reducing regulator must be used. The minimum pressure at the
inlet to the heater regulator must be equal to or greater than 6.0" W.C. for natural gas and 11.0" W.C.
for propane gas.
A sealed regulator is supplied with the heater which maintains the proper manifold pressure when the
main burner is operating under the following pressure:
NATURAL GAS
PROPANE GAS
INPUT CAPACITIES: Natural gas models have an orifice sized for heat content of 1000 BTU/
CU FT., and propane gas models have an orifice sized for 2500 BTU/CU FT.
LINE PRESSURE IWC
MINIMUM
MAXIMUM
6.0
14.0
12.0
14.0
Page 3
MANIFOLD PRESSURE IWC
AT TAP IN GAS VALVE
5.0
11.0
GP-MECX-CX-1A
eco-X / IL-X Manual
RD: SEPT 2005
RL: 1A
BA
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