Program menu - continued – Greenheck Microprocessor Controller v3.0 (469690) User Manual
Page 19
19
Will heater be used
for reheat during
dehumidification?
Reheat:Enable
T
HIS
SCREEN
ALLOWS
THE
USER
TO
E
NABLE
THE
HEATER
FOR
REHEAT
PROCESS
.
This screen only appears if a Heating option was provided with the unit and the unit
does NOT have hot gas reheat.
If it is desired that the heater be used to reheat the air off the cooling coil when in
dehumidification, adjust this screen so the Enable is displayed.
Will heater be used for
reheat along
with the hot gas?
Heater:Disable
T
HIS
SCREEN
ALLOWS
THE
USER
TO
E
NABLE
THE
HEATER
TO
PROVIDE
ADDITIONAL
REHEAT
.
This screen only appears if Hot Gas Reheat and a Heating option was provided with
the unit.
Setting the Heater parameter to Enable allows the Heating option to provide additional
reheat above and beyond what the Hot Gas Reheat can provide. This would typically
only be used if the discharge temperature off the Hot Gas Reheat coil was too cold for
the space.
Hot Gas Controller
Integration:300s
Band:20ºF
T
HIS
SCREEN
DISPLAYS
THE
INTEGRATION
TIME
FOR
THE
PI
CONTROL
OF
THE
HOT
GAS
REHEAT
MODE
AND
THE
TEMPERATURE
BAND
AROUND
A
SET
POINT
.
These parameters may be adjusted if necessary. This screen only appears if a Hot
Gas Reheat option was provided with the unit.
This controller uses a Proportional + Integral type control. The integration time
programmed into the controller is to provide a smooth reaction to conditions, allowing
for less sporadic changes in discharge temperature. 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.
Range of Integration = Supply set pt ± Band. ie: 50° F ± 20° F
Hot Gas reheat coil
minimum on/off
time 10 minutes
T
HIS
SCREEN
ALLOWS
THE
USER
TO
ADJUST
THE
MINIMUM
ON
/
OFF
TIME
FOR
THE
HOT
GAS
REHEAT
COIL
.
This screen only appears if ON/OFF Hot Gas Reheat was provided with the unit.
This is the minimum on/off time operation for the Hot Gas Reheat coil. The factory
programmed time prevents short-cycling of the coil, which allows for better oil
distribution through the DX system.
Use caution when altering the on/off time as damage may occur to the system
if set too low. Consult the factory for information.
Supply Reset Control
Integration:300S
Band:20ºF
T
HIS
SCREEN
DISPLAYS
THE
INTEGRATION
TIME
AND
TEMPERATURE
RANGE
FOR
THE
PI
CONTROL
OF
THE
S
UPPLY
R
ESET
T
EMPERATURE
.
These parameters may be adjusted if necessary. This screen only appears if a Room
Supply Temp sensor is wired between B4 and BC4 on the controller.
This controller uses a Proportional + Integral type control. The integration time
programmed into the controller is to provide a smooth reaction to conditions, allowing
for less sporadic changes in discharge temperature. 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.
Range of Integration = Room set pt ± Band. ie: 72° F ± 20° F
PROGRAM MENU - continued