Rheem P17 Series User Manual

32
Operation
• Defrost Termination: The defrost cycle will
continue until the coil temperature has reached
the termination temperature or 14 minutes
have elapsed, whichever comes first. The
factory default termination temperature is 60°F
[15.6°C], although this temperature can be
changed to 40°F [4.4°C], 50°F [10°C], or 70°F
[21.1°C] using dip switches on the VSODC (see
chart below for dip switch settings). When
the coil temperature reaches the termination
temperature or 14 minutes have elapsed, the
following action is taken.
1. The compressor speed is ramped to the
reversing valve switching speed for 30
seconds before the reversing valve is
energized.
2. The reversing valve will be energized,
switching it back to the heating position.
3. The outdoor fan motor is energized.
4. Auxiliary heat is de-energized.
5. The EXV will return to the normal
superheat control mode.
6. The compressor speed will ramp to a pre-
determined oil circulation speed for 6
minutes.
7. The system returns to normal heating
operation as directed by the EcoNet
TM
Control Center.
NOTE: Should the outdoor ambient
temperature thermistor fail, the VSODC
will initiate a defrost every 34 minutes of
operation when the coil temperature is
below 35°F.
6.8 Sequence
of Operation for
Conventional 24VAC
Thermostat Controls
• When the RP17 heat pump system is
controlled by a conventional 24VAC 2-stage
thermostat rather than the EcoNet
TM
Control
Center, the system will operate as follows:
• The system will also operate as a 3-stage
system, but in a slightly different manner.
• When a call for 1st stage cooling or heating
is received from the 2-stage thermostat,
the compressor will start and operate at the
minimum capacity level and the air-handler
or gas furnace will deliver 1st stage air-flow.
For dual fuel applications with a (-)802V,
(-)96V, (-)97V, or (-)98V variable speed gas,
1st stage air-flow for furnaces is factory set to
be 75% of the cooling air-flow level selected
by DIP switches on the furnace control board.
A separate DIP switch on the furnace control
board can be set so the 1st stage air-flow
is 50% of the selected cooling air-flow level
instead of 75%.
• After 15 minutes of operation with a continuous
1st stage call for operation, the compressor
will automatically ramp to a pre-determined
intermediate speed, but the air-handler or gas
furnace will remain at the 1st stage air-flow
level.
• If the thermostat calls for 2nd stage operation,
the compressor will ramp to its full capacity
step and the air-handler or gas furnace will
deliver the 2nd stage air-flow level.
• If the system then cycles between 1st and 2nd
stage, the compressor will cycle between the
maximum and intermediate speeds and the air-
handler or gas furnace will cycle between the
1st and 2nd stage air-flow levels as directed by
the 2-stage thermostat.
• When the call for operation ends, the system
will shut down and the indoor blower motor will
ramp down to the minimum air-flow level for
30-45 seconds before it stops.
• Demand defrost and low-ambient cooling will
function the same as they do when the system
is controlled by an EcoNet
TM
Control Center.
6.0 NORMAL SEQUENCE OF OPERATION
Off
On
Off
On
Off
Off
On
On
60
º
F [15.6
º
C]
50
º
F [10
º
C]
40
º
F [4.4
º
C]
70
º
F [21.1
º
C]
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Rheem P17 Series Specifications

General

Brand	Rheem
Model	P17 Series
Category	Heat Pump
Language	English