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2.8 ELECTRICAL REQUIREMENTS AND THERMOSTAT CONTROL
All electrical installations must meet local
and Canadian Electrical Code Part CSA
C22.1. Single heater requires 24 Volt, 60 Hz
electrical transformer sized at 40 VA. If mul-
tiple heaters are connected to a single trans-
former, the proper transformer is 24 Volt,
60 Hz, sized at 20 VA per heater. For exam-
ple, five heaters wired together (parallel), re-
quire a transformer of 100 VA.
It is not recommended to install more than 12
heaters per zone. PROPER WIRING PO-
LARITY MUST BE MAINTAINED, par-
ticularly when grouping the heaters in a zone.
3. INSTALLATION PROCEDURES
A. Properly install gas line as outlined in
section 2.7, on page 3.
B. Properly connect the ignition control as-
semblies to the heater.
C. Mount heaters by using non-combustible
mounting hardware as illustrated in Dia-
grams 2 & 3 on page 7. Observe the mini-
mum clearances as outlined in sections
8.3 and 8.7.
D. Connect heater to the main gas line. It is
recommended to use a 1/2" flexible con-
nector to absorb gas line expansion and
WARNING:
When testing the main gas line pressure, ensure the gas shut-off
valve supplying the heater is "OFF", otherwise damage to the
combination gas valve will result.
G. Ensure proper electrical rating in the sys-
tem by checking voltage at ignition mod-
ule terminals. To avoid system malfunc-
tion, the voltage range must be within
21.6 volts to 26.4 volts.
Total wiring distances of up to 200' must use
minimum 16 gauge electrical wire, and wir-
ing distances of over 200' must use minimum
14 gauge electrical wire. The heater must be
electrically grounded in accordance with the
electrical code.
The heater can be controlled by a line voltage
thermostat, a black bulb sensor with control
or "off-on" switch. Total load of all heaters
must be considered in determining the re-
quired contact rating of the controlling ther-
mostat or switch.
any building vibration (available as
option from Schwank Inc.)
E. Mount thermostat at desired location,
away from direct infra-red rays of heater
and not on cold wall without sufficient
insulation backing. Install exhaust fan, air
switch and transformer, as per section
2.6, page 3 and section 2.9, page 4.
F. Check gas line for leakage by using soap
test or gas meter test. Ensure gas pressure
meets the requirements outlined in sec-
tion 2.8, page 3.
H. Test fire the heating system by follow-
ing the lighting instructions as shown
on the next page and on heater.
Page 4
SP-MSU4-CX-09D
Supra/Primo - 40 Manual
RD: FEB 2009
RL: 9E
BA
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