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035-17414-000 REV A (1200) 550.38-O1Y
Unitary Products Group 3
can cycle the fan during unoccupied
mode or during the night while you
sleep to further conserve energy.
ON
CONTINUOUS FAN OPERATION: With
the thermostat fan switch set to “ON”,
the indoor fan will not shut off. However,
the cooling and heating systems will still
operate as required by room tempera-
tures. This provides continuous air filter-
ing and more even temperature
distribution to all conditioned spaces.
FAN ONLY OPERATION: On moderate
days, usually during spring and fall,
when neither heating nor cooling is
required, you may want to run only the
fan to ventilate, circulate and filter the
air in your home or building. Set the
comfort control switch to “OFF” and the
fan switch to “ON”. Be sure to return the
switches to their original positions for
normal operation.
START-UP
The comfort control switch is assumed
to be in the “OFF” position. If the main
power supply to the outdoor and indoor
units is off, turn the appropriate discon-
nects to the “ON” position. Place the
system into operation as follows:
1. Set temperature adjustment to the
desired temperature on your thermo-
stat.
COOLING - The higher the setting, the
lower the amount of energy consumed.
The National Bureau of Standards rec-
commends a setting of 78
°F.
HEATING - The lower the setting, the
lower the amount of energy consumed.
Federal guidelines recommend a set-
ting of 65
°F or lower.
NOTE: if your cooling and heating tem-
perature adjustments are separate, be
sure to set both.
2. After considering “Fan Operation
Selection” above, select and set the fan
operation mode you desire.
3. Move the comfort control switch to
the desired mode of operation (Cooling
or Heating) found on your particular
thermostat.
POWER FAILURE
When accidents, wind storms, etc. dis-
rupt electrical power supply to your
house, switch thermostat to “OFF” posi-
tion. CAUTION: if the power was off
more than 8 hours DO NOT switch to
“COOLING” or “AUTO” until electrical
power has been re-established for 8
hours.
SYSTEM OPERATION
MANUAL CHANGE-OVER
THERMOSTAT
COOLING YOUR HOME - With the
comfort control switch in the “COOL”
position, the system will operate as fol-
lows: When the indoor temperature
rises above the level indicated by the
temperature adjustment setting, the
system will start. The outdoor unit will
operate and the indoor fan will circulate
the cooled, filtered air. When the room
temperature is lowered to the setting
selected, the system will shut off. HEAT-
ING YOUR HOME - If your system
includes a heating unit and the comfort
control switch is in the “HEAT” position,
the system will operate as follows:
When the indoor temperature drops
below the level indicated by the temper-
ature adjustment setting, the system will
start. The heating system will operate
and the indoor fan will circulate the fil-
tered air. When the room temperature
rises to the setting selected, the system
will shut off. Whether heating or cooling,
the fan will continue to operate if the fan
switch was set in the “ON or Intelligent”
position. The “AUTO” setting on the fan
switch will allow the fan to shut off when
your system does.
ELECTRONIC THERMOSTAT
The computerized electronic thermo-
stat, when programmed, will function
automatically to operate the system as
follows: When the indoor temperature
rises above the higher (COOL) setting,
the outdoor unit will operate and the
indoor fan will circulate the cooled, fil-
tered air. When the room temperature is
lowered to the selected level, the sys-
tem will shut off. The indoor fan will
either shut off or run continuously,
depending upon your choice of fan
switch setting. When the indoor temper-
ature is lowered to the selected level,
the system will shut off. The indoor fan
will either shut off or run continuously,
depending upon your choice of fan
switch setting. When the indoor temper-
ature drops below the lower (HEAT) set-
ting, the heating system will operate,
and the indoor fan will circulate the
heated, filtered air. When the indoor
temperature rises to the selected set-
ting, the system will shut off.
CARE OF SYSTEM
YORK strongly recommends regular
periodic preventative maintenance on
this equipment. The person most
familiar with the equipment in your
H.V.A.C. system is a YORK dealer.
The YORK dealer can ensure your
maintenance program meets the con-
ditions of the “YORK Warranty”, maxi-
mize the efficiency of the equipment,
and service your unit within the feder-
ally mandated guidelines with regard
to unlawful discharge of refrigerants
into the atmosphere.
COIL CARE
Keep the outdoor unit free of foliage,
grass clippings, leaves, paper, and any
other material which could restrict the
proper air flow in an out of the unit. The
coil may be vacuumed to remove any
debris from between the fins. If the coil
becomes excessively dirty, turn the
main disconnect switch to “Off” and
wash the coil with your garden hose.
Avoid getting water into the fan motor
and control box. Flush dirt from base
pan after cleaning the coil.
Do not operate this unit
when outdoor temperatures
are below 60°F as this will
cause damage to the unit.