3
UNIT INTRODUCTION
The 674D and 674D units are small packaged gas heat/electric heat
pump systems that can utilize both the efficiency of heat pump heat-
ing and the comfort of gas heating. The system will optimize for
ideal heating, depending on several factors. This unit uses Puron®,
the ozone friendly refrigerant, for cooling and heat pump heating.
Starting or Shutting Off Unit
Note:Your combination heating/cooling unit is equipped with an
automatic direct spark ignition and power combustion blower.
Access Panels
A09036
Fig. 3 -- Gas Heating/Electric Cooling Unit Access
Panels
To start unit gas heat:
Refer to Fig. 3 for location of unit front access panel. Refer to Fig.
4 for location of gas valve. Refer to Fig. 6 while proceeding with
the following steps.
1. Setthetemperatureselector on room thermostatto thelowest
temperature setting and set system switch to Emergency
Heat.
2. Close the ex ternal manual gas shutoff valve.
3. Turn off the electrical supply to the unit.
4. Remove the front access panel with a 5/16--in. nut driver .
5. Move the selector switch on the internal gas valve to theOFF
position and wait 5 minutes.
6. Move the selector switch on the internal gas valve to the ON
position.
7. Replace the front access panel.
8. Turn on the electrical supply to unit.
9. Open the external manual gas shutoff valve.
10. Set the temperature selector on room thermostat slightly
above room temperature to start unit. The induced --draft
combustion air fan will start. Main gas valve will open and
main burners should ignite within 5 seconds. If the burner
does not light within 5 seconds, the ignition module will go
into a Retry Mode after a period of approximately 22
seconds (following the 5--second ignition period). If the
burners do not light within 15 minutes of the initial call for
heat, there is a lockout.
11. Set the temperature selector on room thermostat to desired
setting.
Burners
Gas Valve
Flue Hood
A09043
Fig. 4 -- Gas Heating/Electric Cooling Unit with
Access Panel Removed
FIRE AND EXPLOSION HAZARD
Failure to follow this warning could result in personal injury,
death, and/or property damage.
1. If the main burners fail to light, or the blower fails to start,
shutdown gas heating section and call your dealer for service.
2. Never attempt to manually light the main burners on unit
with a match, lighter, or any other flame. If the electric
sparking device fails to light the main burners, refer to the
following shutdown procedures, then call your dealer as soon
as possible.
!
WARNING
To shut off unit gas heat:
FIRE, EXPLOSION, ELECTRICAL SHOCK
HAZARD
Failure to follow this warning could result in personal injury,
death, and/or property damage.
Do not turn off the electrical power to unit without first
turning off the gas supply.
!
WARNING
Note:If the unit is being shut down because of a malfunction, call
your dealer as soon as possible.
Should overheating occur or the gas supply fail to shut off, shut off
the external manual gas valve to the unit before shutting off the elec-
trical supply. Do not use this unit if any part has been under water.
Immediately call a qualified service technician to inspect the unit
and to replace any part of the control system and any gas control
which has been under water.
Refer to Fig. 7 while proceeding with the following steps.
1. Set the temperature selector on room thermostat to lowest
temperature setting and set system SWITCH to OFF.
2. Close the ex ternal manual shutoff valve.
3. Turn off the electrical power supply to the unit.
4. Remove the front access panel.
5. Move theselectorswitch on theinternalgas valve to theOFF
position.
6. Replace the front access panel.
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