11
temperature selector below the existing room
temperature. Allow the cooling system to operate
for several minutes and check for the discharge
of cool air at the supply registers.
Short Cycle Protection
The control circuit is equipped with a time-delay
feature for protection against short cycling.
With the system operating in the cooling mode,
gradually raise the thermostat temperature setting
until the whole system de-energizes. Immediately
lower the thermostat temperature to the original
setting and verify that the indoor blower is
energized. After approximately 5 minutes the
compressor and the outdoor fan will energize.
Emergency Heat
(Available only when Electric heat is supplied)
Set the thermostat’s system mode to EM HT and
the fan mode to either AUTO (intermittent air) or
to ON (continuous air). Change the thermostat’s
temperature selector above the existing room
temperature and check the following:
1. The thermostat auxiliary heat light (RED)
should be on.
2. The heat pump compressor and the fan should
not run; low voltage circuit remains energized.
3. The blower will run according to the
thermostat’s fan mode setting.
Defrost Test Procedure
1. Terminals
R
&
C
must have 18 - 30V between
them for defrost sequences to initiate.
2 With thermostat in heat mode (
Y
connected to
R
), short (and hold) the TEST pins together.
NOTE:
This energizes the reversing valve to
initiate a forced defrost, bypass the ASCD, and
allow the high stage compressor to turn on
immediately (if the REMOVE FOR NO DELAY
jumper at
P6
is removed). If the jumper at
P6
is installed, the compressor will energize after
a 30 second delay.
3. Remove the short on the TEST pins.
• If the Coil temperature is above the Terminate
Temperature setting, the defrost cycle will
terminate (reversing valve de-energizes).
• If the coil temperature is below the Terminate
Temperature setting, the defrost cycle will
continue for 14 minutes (or until the coil
temperature rises above the Terminate
Temperature setting). Short the TEST pins
for 1 second or more to force the control
out of defrost and back to heating mode
(reversing valve de-energized). Compressor
will start immediately (if the REMOVE
FOR NO DELAY jumper is removed).
NOTE:
If the jumper is installed, the compressor
will energize after a 30 second delay.
Anti Short Cycle Timer Test
The 5 minute time delay feature can be bypassed
by shorting the TEST pins together.
Heating Mode
When the TEST pins are shorted together for
more than 1 second, the control will switch
between defrost mode and heating mode.
Cooling Mode
When the TEST pins are shorted together for
more than 1 second, the Anti Short Cycle Timer
will be bypassed.
Adjustment of Refrigerant Charge
CAUTION:
The Q5RD heat pump contains
liquid and gaseous refrigerant
under pressure. Adjustment of
refrigerant charge should only
be attempted by qualifi ed, trained
personnel thoroughly familiar with
the equipment and safe responsible
refrigerant handling procedures.
Under no circumstances should
the homeowner attempt to install
and/or service this equipment.
Failure to comply with this warning
could result in equipment damage,
personal injury, or death.
• The unit must be charged while both fi rst and
second stages are operating.
• To achieve rated capacity and effi ciency the
compressor must be exposed to refrigerant
for at least 24 hours prior to running and then
must be run for a minimum of 12 hours. See
refrigerant charging charts for cooling mode
operation (Tables 5 - 10, pages 14 - 16).
Charging an R-410A Unit in AC Mode with
Outdoor Temperatures Above 65° F
1. With the system operating at steady-state,
measure the liquid refrigerant pressure in
psig at the service valve.
2. Measure the liquid refrigerant temperature
(° F) at the service valve.
3. For the temperature measured, determine the
required liquid refrigerant pressure from the
appropriate charging charts.
• If the pressure measured in step 1 is greater
than the required liquid refrigerant pressure
determined in step 4, then there is too much
charge in the system. Remove refrigerant and
repeat steps 1 through 3 until the system is
Содержание Q5RD Series
Страница 23: ...23...
