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2.6 VENTILATION REQUIREMENTS
Canada: it is required by law that an unvented heater be electrically interlocked to an independent ex-
haust 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 edi-
tion for requirements.
USA: when a heater is installed unvented the system requires the exhausting of at least 4 cfm per 1000
Btu/hr on NG, and 4.5 cfm per 1000 Btu/hr for LP. By natural or mechanical means, or to an independ-
ent 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 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.
CAUTION:
Do not install any gas piping in heat zones. Do not subject heater 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 pro-
pane 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
The heater orifice is sized for the following fuel gas heat content:
Natural gas: 1,000 BTU/CU FT.
Propane gas: 2,500 BTU/CU FT.
D. On propane-fired units, a main line filter is
E. Piping joint compounds must be resistant to
F. All piping joints should be tested for leaks
LINE PRESSURE IWC
MINIMUM
MAXIMUM
6.0
14.0
12.0
14.0
Page 3
recommended.
the action of liquefied petroleum gases.
with a soap and water solution.
MANIFOLD PRESSURE IWC
AT TAP IN GAS VALVE
5.0
10.0
ecoSchwank-MILLIVOLT / IL-MILLIVOLT Manual
IM090128
RD: JAN 2009
RL: 1D
BA
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