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2.6 VENTILATION REQUIREMENTS
In Canada it is required by law that an un-
vented heater be electrically interlocked to an
independent 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.B149.1-00 latest
edition for requirements. In the USA when a
heater is installed unvented the system re
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
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.
2.7 GAS PRESSURE
The maximum supply pressure must be lim-
ited to 14" W.C. (0.5 psi). If the line pressure
is above 14" W.C., then a separate pressure
reducing regulator must be used. The mini-
mum pressure at the inlet to the heater regula-
tor must be equal to or greater than 6.0" w.c.
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 (inches w.c.)
MINIMUM
MAXIMUM
6.0
11.0
Page 3
quires the exhausting of at least 4 Cfm per
1000 Btuh/hr on NG, and 4.5 Cfm per 1000
Btu/hr for LP. By natural or mechanical
means, or electrically interlocked to an in-
dependent 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.
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.
for NG and 11.0" w.c. for LPG. 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 (inches w.c)
AT TAP IN GAS VALVE
14.0
14.0
5.0
10.0
SP-MSU4-CX-09D
Supra/Primo - 40 Manual
RD: FEB 2009
RL: 9E
BA
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