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SECTION 7
Wiring
Heaters are normally controlled by thermostats. Line voltage
thermostats are wired directly (see Figure 15), 24V thermostats
are wired directly by finding and removing the jumper wire on the
back of the burner box and wiring the thermostat to the terminals
(see Figure 16). Heaters must be grounded in accordance with the
National Electric Code ANSI/NFPA- 70 or current Canadian Electrical
Code, CSA C22.1. Heaters may also be controlled with a manual line
voltage switch or timer switch in place of the thermostat.
FIGURE 15: Line Voltage Thermostat Wiring
Black
T
Black
White
T
White
Green
120v – 60 Hz
Supply Circuit
Green
120v – 60 Hz
Supply Circuit
FIGURE 16: Low Voltage Thermostat Wiring
Black
White
Black
Green
120v – 60 Hz
White
Supply Circuit
Green
120v – 60 Hz
Supply Circuit
FIGURE 17: Ener-Radiant XL Burner Internal Wiring
•
If any of the original wire as supplied with the
appliance must be replaced, it must be replaced with
wiring material having a temperature rating of at
least 105°C and 600 volts.
•
Each burner must be electrically grounded in
accordance with the National Electric Code ANSI/
NFPA - 70 or current Canadian Electrical Code, CSA
C22.1.
Transformer
120V
White
24V
120
Black
Blue
VAC
Green
White
Green
Black
Terminal
Bushing
Motor / Blower
Door Switch
Burners
(Maximum – 2 per Thermostat)
Burners
(Maximum – 2 per Thermostat)
H
H
N
N
Burners
(Maximum – 1 per Thermostat)
H
Burners
(Maximum – 1 per Thermostat)
N
H
T
N
T
Gas Valve
White
Orange
THERMOSTAT
Black
White
Black
Air Switch
Sensor
Ignitor
Enerco | Heatstar ERXL Series Heater
FIGURE 18: Ener-Radiant XL Burner Internal Wiring Ladder
Diagram
L2
(NEUTRAL)
White
Orange
White
Black
Door Switch
Motor / Blower
Black
SECTION 8
Operation & Maintenance
Sequence of Operation
1.
Turn the thermostat up. When the thermostat calls for heat,
blower motor will energize.
2.
When the motor approaches nominal running RPM, the air
proving switch closes and activates the ignition module.
3.
The ignition module then energizes the hot surface igniter for a
timed warm-up period (approximately 45 to 60 seconds.)
4.
After the warm-up period, the gas valve is energized.
5.
During the last part of the sequence, the igniter is de-energized
and is converted to a flame sensing rod.
6.
If a flame is detected, the gas valve remains open. When the
call for heat is satisfied, and the system control mechanism
de-energizes the burner line voltage supply, the gas valves are
turned off.
7.
If no flame is detected on a single-try module, the gas valve
is closed, and the module will lockout until it is reset. Reset is
accomplished by removing power from the module for at least
five (5) seconds (thermostat cycle required.)
8.
If no flame is detected on a three-trial module, the gas valve is
closed, and a purge period begins. After the purge, the module
acts to power the igniter for a second warm-up period, and a
second trial for ignition period. If flame is still not established, a
third and final purge, warm-up, and trial cycle begins. After three
trials, the module will lockout until reset. Reset is accomplished
by removing power from the module for at least five (5) seconds
(thermostat cycle required.)
9.
On a three-trial module, if flame is established and lost on the
first or second trial, the gas valve is turned off, a purge, warm-up,
and trial for ignition will occur on a three-trial module, only three
trials for ignition are allowed per thermostat cycle.
E-18
Operating Instructions and Owner's Manual
120V
24V
Transfomer
Thermostat
Air Switch
White
Gas Valve
Yellow
Yellow
White
Ignitor
White
White
Gray
Black
L2 (HOT)
Black
Blue
Purple
Sensor
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