858539-YUM-A-0512
Unitary Products Group
3
temperature desired, the greater
the amount of time your unit must
operate.
Set your thermostat 2 or 3
F below
normal several hours before enter-
taining large groups during hot
weather. People give off consider-
able heat and moisture.
On an extremely hot day, the
indoor temperature may rise 3 to
6
F above the thermostat setting.
Properly selected equipment does
not have the capacity to maintain a
constant indoor temperature during
this peak load. Over-sizing your
system to handle this peak load
isn’t practical because the over-
sized system would operate much
less efficiently at all other condi-
tions.
For a detailed sequence of opera-
tion see the unit installation man-
ual.
HEATING CYCLE
With the thermostat in the heating
position, and outdoor temperature
in the range of 20 - 30
or below,
the outdoor unit will generally run
for extended periods of time.
When the outdoor air is cool and
moist, frost may form on the sur-
face of your outdoor coil. When this
frost builds to a certain point, your
system will switch to a defrost
cycle. Although you may feel cooler
air coming from your registers, DO
NOT adjust your thermostat. This
frost will melt quickly, and your sys-
tem will return to normal operation
automatically.
For a detailed sequence of opera-
tion see the unit installation man-
ual.
SPARK TO PILOT IGNITION
DEVICE
This unit is equipped with a spark
to pilot ignition device. The control
is designed to automatically light
the burner each time the thermo-
stat “calls” for emergency heat or
when operating during defrost.
INPUT
The correct heat capacity of the
gas heating section is regulated by
the burner orifices and the gas
pressure. The proper orifices are
furnished but the gas pressure reg-
ulator must be adjusted by the
installing serviceman or gas com-
pany. This is usually a "one time"
adjustment, but should be checked
during your regular maintenance
schedule.
FOR YOUR SAFETY, READ
BEFORE OPERATING
A.
BEFORE OPERATING, smell all
around the appliance area for gas.
Be sure to smell around the base
of the unit because some gas is
heavier than air and will settle in
the area.
WHAT TO DO IF YOU
SMELL GAS
•
Do not try to light any appliance.
•
Do not touch any electrical
switch.
•
Do not use any phone in your
building.
•
Immediately call your gas sup-
plier from a neighbor's phone.
Follow the gas supplier's
instructions.
•
If you cannot reach your gas
supplier, call the fire department.
B. Use only your hand to push in
or turn the gas control knob.
Never use tools. If the knob will
not push in or turn by hand,
don't try to repair it, call a quali-
fied service technician. Force
Do not attempt to manu-
ally light the burners. Per-
sonal injury could result.
Should overheating occur,
shut off the manual gas
valve external to the appli-
ance before shutting off the
electrical supply.
Flue hood surface and
immediate area is designed
to operate at high tempera-
tures during a gas heating
cycle. Special attention
must be given to keep all
human contact and debris
away from this area.
Incorrect installation of the
flue vent hood could cause
personal injury or property
damage.
!
WARNING
!
WARNING
V E N T O U T L E T S C R E E N
F L U E V E N T O U T L E T
A I R H O O D
!
WARNING
If you do not follow these
instructions exactly, a fire
or explosion may result,
causing property dam-
age, personal injury or
loss of life.
!
WARNING
