Schwank SER(IR) - Manual (Page 18)

GP-MSER-BX-11A
SER / IR Manual
RD: March 2006
RL: 11A
KH
Page 14
WARNING:
The heater must be electrically grounded in accordance with the current Electrical Code.
13. HIGH ALTITUDE INSTALLATIONS
In Canada all of the SER / IR radiant tube heaters are approved for altitudes zero to 4500 feet
above sea level and do not require de-rating.
In the USA if a heater is to be installed at altitudes above 2000 ft, the input must be reduced by
4% per 1000 ft. If your local utility de-rates the heat content in the gas supply, no modification
of the heater is required. If the gas supply is not de-rated, the orifice must be changed according
to the chart on page 29. Check with your local utility regarding de-rating of this appliance.
14. OPERATING SEQUENCE
The SER / IR-45 burner with direct spark ignition, operating sequence is as follows:
1. On call for heat, relay is energized closing contacts to power up the combustion air fan mo-
tor. When the fan is up to speed, and enough pressure is built up, the pressure switch con-
tacts close, energizing the ignition module. The ignition module incorporates a 30-second
pre-purge period. Following pre-purge, the gas valve is energized and spark commences for
the trial for ignition period of 21 seconds.
2. When a flame is detected during the trial for ignition, the spark is shut off immediately and
the gas valve remains energized. When the thermostat is satisfied and the demand for heat
ends, the blower, ignition module and gas valve are all de-energized.
Each tube heater requires 120V, 60 HZ electrical power sized for 145VA. The heater
can be controlled by the TruTemp set back Thermostat, a line voltage thermostat or by an “ON/
OFF" switch.
IMPORTANT:
Do not install the thermostat or sensors in the direct radiant stream