York Heating & AIR CONDITIONER User Manual download pdf (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 then 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.

CongratulationsCongratulations . . .

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

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York Heating & AIR CONDITIONER User Manual Page 2

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