Greenheck Microprocessor Controller (474706 IOM) TAP v1.04 June 2011 (ERCH, ERH, APEX, VER, ERT) User Manual
Page 23
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DDC Controller for Tempered Air Products
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.
T
his
screen
allows
adjusTmenT
of
The
minimum
on/off
Times
for
The
hoT
gas
reheaT
coil
.
This screen 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
minimum run time prevents short cycling of the coil, allowing for better oil
distribution through the DX system. CONSULT THE FACTORY BEFORE
CHANGING MINIMUM ON/OFF HOT GAS REHEAT TIMES.
T
his
screen
allows
adjusTmenT
of
The
h
oT
g
as
r
eheaT
pi
conTrol
loop
.
This screen only appears if hot gas reheat was provided with the unit.
The controller utilizes a PI loop control for reheat. This allows for less sporadic
changes in supply air 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.
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.
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.
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.
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 Timers
Minimum ON:
30s
Minimum OFF:
180s
Between Stages:
30s
Compressor Staging
Stage1: ON @ 50% OFF 0%
Stage2: ON @ 100% OFF 50%
Heater Controller
Integration:
300s
Band:
20°F
Reheat Setup
Will heater be used for reheat
during dehumidification?
Reheat:
Disable
Reheat Setup 2
Will heater be used for reheat
along with hot gas?
Heater:
Disable
Hot Gas Controller
Integration:
300s
Band:
20°F
Hot Gas Setup
Hot gas reheat coil minimum
on/off time:
10minutes
®