31
RJ SERIES INSTALLATION MANUAL
Heat, 3rd Stage (Y1,Y2,W) Dual Capacity Units
The 1st stage of resistance heat is energized 10 seconds after “W”
input, and with continuous 3rd stage demand, the additional stages
of resistance heat engage sequentially every 5 minutes.
Emergency Heat (W only)
The fan is started on high speed, and the first stage of resistance
heat is energized 10 seconds after the “W” input. Continuing
demand will engage the additional stages of resistance heat
sequentially every 2 minutes.
Cooling Operation
In all cooling operations, the reversing valve directly tracks the “O”
input. Thus, anytime the “O” input is present, the reversing valve
will be energized.
Cool, 1st Stage (Y1,O)
The blower motor and hot water pump are started immediately,
the loop pump(s) is energized 5 seconds after the “Y1” input is
received. The compressor will be energized (on low capacity for
Dual Capacity units) 10 seconds after the “Y1” input. The ECM
blower will shift from low to medium speed 15 seconds after the
“Y1” input (85% of medium speed if in dehumidification mode).
Cool, 2nd Stage (Y1, Y2, O) Single Speed Units
The fan changes to high speed (85% of high speed if in
dehumidification mode) 15 seconds after the “Y2” input (ECM only).
Cool, 2nd Stage (Y1, Y2, O) Dual Capacity Units
The second stage compressor will be activated 5 seconds
after receiving a “Y2” input as long as the minimum first stage
compressor run time of 1 minute has expired. The ECM blower
changes to high speed 15 seconds after the “Y2” input. (85% of
high speed if in dehumidification mode). The control will delay the
second stage compressor until 5 seconds after it receives a “Y2”
from the board.
Fan (G only)
The fan starts on low speed (PSC ON). Regardless of fan input “G”
from thermostat, the fan will remain on low speed for 30 seconds at
the end of each heating, cooling or emergency heat cycle.
A DIP switch on the control allows field selection of 15% reduced
fan speeds for cooling in the dehumidification mode or medium and
high fan speeds for cooling in the normal mode.
Note: Fan speed can change automatically only with an ECM
Motor.
ECM2 Airflow Selection DIP Switches (SW1)
A 12-position DIP switch package on the control allows the airflow
levels to be set for low, medium and high speed (Refer to the
ECM Blower tables). Only three of the DIP switches can be in the
“on” position. The first “on” switch (the lowest position number)
determines the “low speed fan” setting. The second “on” switch
determines the “medium speed fan” setting, and the third “on”
switch determines the “high speed fan” setting.
Lockout Conditions
During lockout mode, the appropriate unit and thermostat lockout
LEDs will illuminate. The compressor, loop pump, hot water pump,
and accessory outputs are de-energized. Unless the lockout is
caused by an ECM2 low RPM fault, the fan will continue to run
on low speed. If the thermostat calls for heating, emergency heat
operation will occur.
All lockout modes can be reset at the thermostat after turning the
unit off, then on, which restores normal operation but keeps the unit
lockout LED illuminated. Interruption of power to the unit will reset a
lockout without a waiting period and clear all lockout LEDs.
High Pressure
This lockout mode occurs when the normally closed safety switch is
opened momentarily (set at 600 PSI).
Low Pressure
This lockout mode occurs when the normally closed low pressure
switch is opened for 30 continuous seconds (set at 40 PSI).
Freeze Detection (Water Flow)
This lockout mode occurs when the freeze thermistor temperature
is at or below the selected freeze sensing point (well 30°F or loop
15°F) for 30 continuous seconds.
Condensate Overflow
This lockout mode occurs when the condensate overflow level has
been reached for 30 continuous seconds.
Fan RPM
The control board monitors fan RPM to sense operation. This
lockout mode occurs if the fan RPM falls below the low RPM limit
(100 RPM) for 30 continuous seconds (ECM only).
GeoStart
The optional GeoStart single phase soft starter will reduce the
normal start current (LRA) by 60-70%. This allows the heat pump to
go off-grid. Using GeoStart also provides a substantial reduction in
light flicker, reduces start-up noise, and improves the compressor’s
start behavior. GeoStart is available in a field retrofit kit or as a
factory installed option for all RJ Series units.
RJ Series Controls - Premier Microprocessor cont.
