Magic-Pak HWC8-12 - OPERATION Modes; Heating Operation Sequence; Cooling Operation Sequence; MAINTENANCE Guidelines

Page 10 of 18 507388-01Issue 1504
OPERATION
Operaon of the unit is automac and will provide heang and
cooling depending on the seng of the thermostat.
Heang
1. Turn on main power supply.
2. Open manual gas shuto valve.
3. Set thermostat system to “HEAT”.
4. Set thermostat to temperature desired.
Cooling
1. Turn on main power supply.
2. Set thermostat system switch to “COOL”.
3. Set thermostat to temperature desired.
Heang Sequence of Operaon
1. Thermostat calls for heat.
2. Combuson blower starts and proper air ow is proven by
the pressure switch closing.
3. Blower connues to operate for 30 seconds prior to the
burners lighng.
4. Ignion control begins spark and opens gas valve. The
burners are lit. Ignion is proved through the ame sensor.
5. Circulang air blower starts 30 seconds aer the burners
light.
6. When the thermostat is sased, the burners and combuson
blower shut o.
7. Circulang air blower will shut o 120 seconds later.
If the burners should fail to ignite, the ignion control will try to
ignite the burners a total of three mes. Should the burners fail
to ignite within the three trials for ignion, the ignion control
will lock out for 1 hour before beginning another ignion cycle.
To reset the control, turn the thermostat down or o for 10
seconds and then set to desired seng. At this me, the ignion
sequence will try again.
Blower Control
The blower will start approximately 30 seconds after the
burners ignite and will stop approximately 120 seconds aer the
thermostat is sased. The me delay is preset at the factory
and ming can not be adjusted.
Cooling Sequence of operaon
When the thermostat system switch is set for “COOL”, the blower
will start 5 seconds aer the thermostat calls for cooling and will
stop 90 seconds aer the thermostat is sased.
Connuous Fan Operaon
Connuous operaon of the air handling blower will be obtained
if the thermostat fan switch is set to “ON”. With the thermostat
fan switch set to “AUTO”, the air handling blower will cycle
corresponding with the thermostat cycling.
To Shut Down Unit
For temporary or short periods of shutdown, set the thermostat
system switch to “OFF”. For a prolonged period of shutdown, set
the thermostat system switch to “OFF” and turn o the electrical
power supply and the gas supply to the unit.
The HWC8 burner & manifold assembly, combuson inducer
assembly, and ignition control board mounting are newly
designed for improved service access over previous models. Refer
to Figure 5 for heang cabinet component layout.
It is recommended that the furnace be inspected annually by a
qualied service person.
MAINTENANCE
ELECTRICAL SHOCK, FIRE OR EXPLOSION HAZARD
Failure to follow safety warnings exactly could result in
dangerous operation, Serious injury, death or property
damage.
Improper servicing could result in dangereous operaon,
Serious injury, death or property damage
• Before servicing. disconnect all electrical power to
furnace
• When servicing controls, label all wires prior to
disconnecting reconnect wires correctly.
• Any disassembly of components containing ue
or vent gases shall be done by a qualied service
agency.
• Verify proper operation after servicing.
WARNING