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2.6 VENTILATION REQUIREMENTS
In Canada it is required by law that an unvented
heater be electrically interlocked to an independ-
ent exhaust fan by means of an Air Proving
Switch. The exhaust fan must be sized to create 3
cfm for every 1000 Btu/hr or fraction thereof, of
total input of installed equipment. Consult CSA.
B149.1 latest edition for requirements.
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.
CAUTION:
Do not install any gas piping in heat zones. Do not subject heater con-
trols 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 regu-
lator 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
NATURAL GAS
PROPANE GAS
Natural gas models are orificed for 1000 BTU/CU FT., and propane gas models are
orificed for 2500 BTU/CU FT.
LINE PRESSURE IWC
MINIMUM
MAXIMUM
6.0
14.0
12.0
14.0
Page 3
In the 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
electrically interlocked to an independant exhaust
fan, for the total input of all heaters installed. Ex-
haust openings for removing flue products shall
be above the level of the heaters.. Consult your
local codes and ANSI Z223.1 latest edition.
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.
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 fol-
lowing pressure:
MANIFOLD PRESSURE IWC
AT TAP IN GAS VALVE
5.0
11.0
SP-MECM-BX-05A
ecoSchwank - Millivolt Manual
RD: MAY, 2004
RL: 5
KH
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