willnormallybeobtainedwhentheunitisoperatingatrated
inputwiththerecommendedblowerspeed.
1. Thetemperaturerisemustbewithinthespecifications
markedontheunitratingplate.
To check the temperature rise through the unit, place ther-
mometers in the supply and return air ducts as close to the
unit as possible.
Open ALL registers and duct dampers. Operate unit AT
LEAST 15 minutes before taking readings.
If the correct amount of temperature rise is not obtained
when operating on the recommended blower speed, it may
be necessary to change the blower speed. A faster blower
speed will decrease the temperature rise. A slower blower
speed will increase the temperature rise.
NOTE: The blower speed MUST be set to give the correct
air temperature rise through the furnace as marked on the
rating plate. See Figure 12 for more information.
2. After 15 minutes of operation check the limit control
function by blocking the
return air grille(s).
After several minutes the main burners and pilot should
go OFE The circulating air blower should continue to
run.
Remove air restrictions. Pilot and main burners should
relight after a cool down period of a few minutes.
3, Adjust the thermostat setting below room temperature.
Main burners and combustion air blower should go
OFF,
The circulating air blower should continue to run for 60,
100, 140 or 180 seconds. This time is adjustable. See
Figure 16 for more information.
4. Set thermostat Heat-Cool selector to OFF,
FAN CONTROL CHECK
Figure 16 Fan Delay DIP Switch Settings
IGNITION CONTROL BOARD EAT OFF DELAY SELECTION Jl
COOL ON DELAY: 0SEC,HEATON DELAY; 30 SEC. 100180_ 14060_; q00180J_ _G0140_;'00180_1 60140_ 100188_ 140_6(}
IlEAl HEAT flEAT HEAT
0FF-DEL)*'f OFF rJELA_ OFF DELAY OFF DELAY
The Fan Control has adjustable settings for the circulating
air blower to delay it "ON" and "OFF".
1. The Fan Control has a fixed "ON" delay of 30 seconds,
and a field adjustable "OFF" delay of 60, 100, 140 and
180 seconds. The "OFF" delay is factory set at 140
seconds.
Refer to NO TAG for proper DIP switch settings.
2. Operate the furnace and ensure that the blower turns
ON and OFF at the appropriate time to provide the
desired comfort level.
10. OPERATION
ELECTRICAL SHOCK HAZARD.
Failure to follow this warning could result in personal
injury, death and/or property damage.
Turn off electric power supply at disconnect switch or
service panel before removing any access or service
panel from unit.
Cooling Operation
These units utilize a 2 stage indoor thermostat. With a first
stage call for cooling (Y1), the indoor fan (low stage)
energizes immediately where as the contactor energizes
after a 5 minute time delay (incase of an initial start up)
starting the compressor (low stage) and the outdoor fan
motor. If the low stage operation cannot satisfy the cooling
demand, the second stage cooling (Y2) energizes
switching the compressor into high stage cooling through
energizing an internal solenoid valve inside the scroll
compressor and switching the indoor fan into high stage.
When second stage cooling is satisfied, Y2 de-energizes
switching the compressor and the indoor fan into low stage
cooling. When the low stage cooling demand is met, Y1
de-energizes shutting the compressor, indoor fan and the
outdoor fan.
Heating Operation
With a first stage call for heating (Y1), the indoor fan (low
stage) energizes immediately whereas the contactor
energizes after a 5 minute time delay (incase of an initial
start up) starting the compressor (low stage) and the
outdoor fan motor. If the low stage operation cannot satisfy
the heating demand, the second stage heating (Y2)
energizes switching the compressor into high stage heating
through energizing an internal solenoid valve inside the
scroll compressor and switching the indoor fan into high
stage. The auxiliary gas heat is controlled by a third stage
(W2). If the auxiliary gas heat is energized, the dual fuel
thermostat will deactivate both the low stage heat pump
(Y1) and high stage heat pump (Y2) operation.
Scroll Recycle Delay timer
The defrost board is equipped with a recycle delay timer
which will delay the start of the compressor for 5 minutes in
the event of a power interruption. This sequences power
throughout the system and prevents possible reverse
rotation of the scroll compressor. The output of the timer
controls the compressor contactor via a normally open
contact of K3 (T2). The timer starts the delay cycle when the
compressor is turned off by removal of "Y." If application of
"Y" occurs before the timer has expired, the compressor
contactor will not be energized until the timer has expired.
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