York Heating & AIR CONDITIONER - Manual (Page 2)

This gas/electric, heating/cooling
unit is designed for outdoor use and
can be installed anywhere from
grade level to the roof. Electric air
conditing in the summer and gas
heating in the winter - all from a
single unit.
SYSTEM OPERATION
THERMOSTATS
Set your thermostat for either
heating or cooling then set it for the
desired temperature. DO NOT
MOVE THE THERMOSTAT RAP-
IDLY ON AND OFF, OR BACK AND
FORTH FROM HEAT TO COOL.
THIS COULD DAMAGE YOUR
EQUIPMENT.
Always allow at least 5 minutes
between changes. Find the tem-
perature that is most comfortable to
you , and the n LEAVE YOUR
THERMOSTAT ALONE. (Exception
is for night or vacation "set back" to
conserve energy)
Manually moving the thermostat
up or down will not speed up tem-
perature changes in your rooms.
This only causes the thermostat
switch to function at your command
rather than responding to room tem-
perature.
Heat generated by devices other
than the furnace may interfere with
thermostat performance. Therefore,
lamps, radios, television sets, etc.
should not be placed near the
thermostat.
HOT SURFACE PILOT
IGNITION DEVICE
This unit is equipped with a hot
surface pilot ignition device. The
control is designed to automatically
light the burner each time the
thermostat "calls" for heat.
HEATING
When the thermostat calls for
"HEAT", the thermostat energizes
the combustion air blower.
After airflow is established, the air
proving switch closes, the hot sur-
face ignitor is energized and the pilot
valve opens igniting the pilot flame.
The flame rod senses a flame and
de-energizes the ignitor opening the
main gas valve and the main burn-
ers light.
30 seconds after the main burners
light the circulating fan is energized
at the heating speed.
When the thermostat is satisfied,
the ignition system is de-energized
closing the gas valve.
After a 5 second postpurge timing
period, the combustion air blower is
de-energized and the heat fan off
timing begins.
When this field selected heat fan
off timing is completed the circulat-
ing fan is de-energized.
If the primary, rollout and auxiliary
limit switches open, the thermostat
and ignition system is de-energized
and the gas valve closes. The com-
bustion blower and the circulating
fan, at heat speed, are energized.
The combustion blower remains
energized for the 5 second post-
purge timing period if the primary,
rollout and auxiliary limit switches
remake the contact (the rollout and
auxiliary limit switches must be
manually reset). The circulating fan
remains energized for the selected
heat delay off timing.
Normal operation of the system
resumes.
COOLING
When the thermostat calls for
"COOL", the thermostat signals the
compressor and outdoor fan to run.
After a cool fan on delay timing of
2 seconds, the circulating fan is en-
ergized at cooling speed.
When the thermostat is satisfied,
the compressor and outdoor fan is
de-energized,
After a cool fan off delay timing of
30 seconds the circulating fan is de-
energized.
CIRCULATING FAN
When the thermostat calls for
"FAN", the thermostat terminal sig-
nals the circulating fan to run at the
heat speed 2 seconds after the
thermostat is energized.
If a call for "HEAT" occurs, the
circulating fan continues to run at
the heat speed.
If a call for "COOL" occurs, the
circulating fan switches to cool
speed after a 4 second delay.
When the thermostat ends the call
for "FAN", the thermostat is de-en-
ergized, de-energizing the circulat-
ing fan.
INPUT
The correct heat capacity of the
furnace is regulated by the burner
orifices and the gas pressure. The
proper orifices are furnished but the
gas pressure regulator must be ad-
justed by the installing serviceman
or gas company. This is a "one-time"
adjustment.
Congratulations Congratulations . . .
On your purchase of our Single Package Air Conditioning Unit. This energy efficient unit has been precision designed,
manufactured of high quality materials and has passed many rigorous inspections and tests to ensure years of satisfactory
service.
This manual is meant to increase your understanding of your system, tells you how to operate it efficiently and how to obtain
the greatest measure of comfort at the lowest operating expense. Please read this manual thoroughly.
We appreciate your interest in our products and your decision to purchase our Single Package Unit. Enjoy your comfort.
CAUTION: Do not attempt to
manually light the burners. Per-
sonal injury could result
WARNING: Should overheat-
ing occur, shut off the manual
gas valve external to the appli-
ance before shutting off the
electrical supply.
2 Unitary Products Group