Greenheck Microprocessor Controller (475595 IOM) TAP v2.10 April 2014 (RVE, ERCH-01, ERT-01) User Manual
Page 31
T
HIS
SCREEN
ALLOWS
THE
USER
TO
ENABLE
THE
HEATER
TO
PROVIDE
REHEAT
IN
ADDITION
TO
HOT
GAS
REHEAT
This screen appears if hot gas reheat and a heating option was provided (except
heat pump).
Setting the heater parameter to enable allows the heating option to provide
additional reheat beyond what the hot gas reheat can provide. This would
typically only be used if the supply air temperature is too cold.
Heater Reheat 2
Will heater be used for reheat
along with hot gas?
Heater: Disable
T
HIS
SCREEN
DISPLAYS
WHEN
EACH
COMPRESSOR
IN
A
SINGLE
OR
DUAL
STAGE
DX
UNIT
WILL
ENGAGE
/
DISENGAGE
.
This screen only appears if DX cooling was provided with the unit.
Each compressor will engage and disengage based upon the percentage of
cooling capacity the controller needs.
Compressor Staging
Stage1: ON @ 50% OFF 0%
Stage2: ON @ 100% OFF
50%
T
HIS
SCREEN
ALLOWS
ADJUSTMENT
OF
THE
H
EATING
PI
CONTROL
LOOP
.
This screen only appears if heating option was provided with the unit.
The controller utilizes a PI loop control for heating. This allows for less sporadic
changes in supply temperature, resulting in a smooth reaction to changing
conditions. To speed up reaction time, decrease the integration time. For slower
reaction time, increase the integration time. When making adjustments, make
them in small increments and test the system to determine if the new setting is
adequate prior to further adjustment. The band is the range that the integration
will occur between. The off delay allows the heating output to temporarily
overshoot the setpoint without dropping the call for heat to prevent unwanted
cycling.
Heater Controller
Integration: 300s
Band: 60°F
Off Delay:
60s
T
HIS
SCREEN
ALLOWS
THE
USER
TO
ENABLE
THE
HEATER
FOR
REHEAT
PURPOSES
.
This screen appears if a heating option was provided and the unit does NOT have
hot gas reheat OR a heat pump.
If it is desired that the heater be used to reheat the air off of the cooling coil when in
dehumidification, adjust this screen so the heater is ENABLED for reheat.
Heater Reheat
Will heater be used for reheat
during dehumidification?
Reheat: Disable
T
HIS
SCREEN
DISPLAYS
THE
COMPRESSOR
MINIMUM
ON
AND
OFF
TIMES
.
This screen only appears if DX cooling was provided with the unit.
The compressor minimum ON/OFF times prevents short cycling of the
compressors.
Compressor Timers
Minimum ON:
30s
Minimum OFF:
180s
Between Stages:
30s
31
DDC Controller for Tempered Air Products
®