H. manufacturer – Greenheck Microprocessor Controller (474706 IOM) TAP v1.04 June 2011 (ERCH, ERH, APEX, VER, ERT) User Manual
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DDC Controller for Tempered Air Products
T
his
screen
allows
The
adjusTmenT
of
parameTers
for
The
economizer
funcTion
.
This screen only appears if an economizer mode was selected with the unit.
The controller utilizes a PI loop control for the economizer function. 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. Range of integration =
Supply set point ± Band.
The minimum ON and OFF times prevent the energy wheel from short cycling
during economizer mode.
T
his
screen
displays
The
digiTal
scroll
compressor
parameTers
.
This screen only appears if a digital scroll compressor was provided with the unit.
Minimum OFF: This is the minimum voltage the controller outputs when the
digital scroll is disabled/OFF
Minimum ON: This is the minimum voltage the controller outputs when the
digital scroll is enabled/ON.
Maximum: This is the maximum voltage the controller outputs when the digital
scroll is operating at full capacity.
Delay OFF: Delays shutting off digital scroll by this duration.
Max Power Start: Upon starting, the digital scroll will run at full capacity for
this duration. This ensures the refrigeration system is at
proper conditions, prior to modulation.
T
his
screen
displays
The
number
of
sTandard
compressor
sTages
provided
wiTh
The
uniT
and
shows
The
roTaTion
sequence
.
This screen only appears if DX cooling was provided with the unit.
The number of stages displayed is equal to the number of non-modulating
compressors. Factory default compressor rotation is LIFO (Last In, First Out).
Compressor rotation can not be changed on units equipped with: Digital
Scrolls, Hot Gas Reheat or Heat Pump.
T
his
screen
allows
adjusTmenT
of
The
c
ooling
pi
conTrol
loop
.
This screen only appears if cooling option was provided with the unit.
The controller utilizes a PI loop control for cooling. 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
allows
The
adjusTmenT
The
T
imed
e
xhausT
f
rosT
c
onTrol
on/off
Times
.
This screen only appears if Timed Exhaust Frost Control was provided with the unit.
The ON/OFF times prevent the build up of frost when the unit is in Timed
Exhaust Frost Control mode.
The Factory Settings menu allows adjustment of parameters that are critical for
proper unit operation. Adjustment of these parameters is only recommended with
factory guidance. To access the Factory Settings menu, enter the manufacturer
password (Default=1000).
Economizer Controller
Integration
300s
Band:
20°F
Econo ON/OFF times:
Minimum ON:
300s
Minimum OFF:
300s
Supply Fan Cycling
Defrost setup
Fan off time:
5min
Fan on time:
30min
Cooling Controller
Integration:
300s
Band:
20°F
Compressor Setup
# of stages:
2
Rotation:
LIFO
Digital Compressor
Minimum OFF:
1.0vdc
Minimum ON:
1.9vdc
Maximum:
5.0vdc
Delay OFF:
60s
Max Power Start:
120s
H.
Manufacturer
c. Factory Settings
®