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LADDER DIAGRAM
FIGURE 18C
L
Panel Interlock
M
F1/120
F2/IND
(Control PCB)
C1
HSI
L1
S1/120
(Control PCB)
PCB
L1
PCB
L1
115V
24V
R
PCB
PSW
PCB
Pressure Switch
(Control PCB)
W1
W
T'Stat
W2
SECTION 8
Operation & Maintenance
Basic Operation of 2-Stage Tube Heater
•
Unit fires at rates designated as Low and High
•
Fire rate is determined by thermostat
Initial Start:
If thermostat is more than 2 degrees above the room/
space temperature, the heater will start and go into high fire
range. The unit will stay in the high range until the space air
temperature reaches the thermostat set-point. The heater will
shut off.
As the room/space air temperature decreases below the
thermostat set point (approximately 1 degree) the heater will
come on and fire until the thermostat set point is reached.
If the room/space air temperature experiences a rapid
decrease in air temperature (below 3 degrees from set point)
the heater will come on and fire at the high rate until the set
point is reached.
HIGH ALTITUDE
Heaters may be fired at full input up to 2000 ft. (610m) above sea level. Above 2000 ft. (610m) a high altitude conversion kit may be required
to ensure proper burner performance, please consult the manufacturer. Be prepared to answer factory questions regarding: type of fuel for the
proposed appliance conversion, gas pressure available at site, and specific altitude at site. The conversion shall be carried out by a manufactur-
er's authorized representative, in accordance with the requirements of the manufacturer, provincial, or territorial authorities having jurisdiction
and in accordance with the requirements of the CSA B149.1 or CSA 149.2 installation codes.
N
Flame Sense
S2/FS
Burner
T1
Gas
Valve
MV1
Chassis Ground
Enerco | Heatstar ER2STG Tube Series Heater
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.
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.
6.
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.)
7.
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.
Maintenance
For best performance, the following maintenance procedures
should be performed before each heating season:
1.
Be sure gas and electrical supply to heater are off before
performing any service or maintenance.
2.
Check condition of blower scroll and motor. Dirt and dust may
be blown out with compressed air, or a vacuum cleaner may be
Earth &
used. When using compressed air, do not exceed 30 psi in order
to not damage fragile hot surface igniter.
3.
Check condition of burner. Carefully remove any dust or
debris from inside the burner box or burner cup.
4.
Inspect the igniter. Replace igniter if there is excessive
carbon residue, erosion, breakage or other defects.
5.
Check the inside of the firing tube with a flashlight. If carbon
or scale are present, scrape out the deposits with a wire
brush or rod, or metal plate attached to a wooden pole.
6.
Check to see that the burner observation window is clean
and free of cracks or holes. Clean or replace as necessary.
7.
Check the flue pipe for dirt. After cleaning as necessary, re-
attach the flue pipe to the heater.
8.
Outside surfaces of heater may be cleaned by wiping with a
damp cloth.
9.
A qualified service agency should be contacted for service
other than routine maintenance.
10. Check vent terminal and fresh air inlet to see that they have
not been blocked during the non-heating season. If either
pipe is restricted, the air switch won't close, resulting in a no-
heat situation.
18
Operating Instructions and Owner's Manual
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