Greenheck Microprocessor Controller v3.0 (469690) - Manual (Page 6)

6
“STATUS LINE”
Hot Gas Reheat:000%
Heater Control:000%
“STATUS LINE”
Energy recovery
wheel differential
pressure is: Normal
“STATUS LINE”
Preheat heater: OFF
End of status menu
T HIS SCREEN DISPLAYS THE CURRENT REHEAT AND HEAT OPERATION OF THE UNIT .
Hot Gas Reheat only appears if provided with unit.
Hot Gas Reheat operation is on/off control displayed as a percent.
100% is ON and 000% is OFF
To override: ‘MANUAL OVERRIDE’ menu >Hot Gas Reheat Override
For Modulating Hot Gas Reheat Control:
000% is OFF and 001% HGRH is ON and the airflow damper is modulating
between 4 VDC and 10 VDC.
Heater Control displays the real-time percent heater output and is directly proportional
to a 0-10 VDC signal provided by the discharge temperature sensor.
To override: ‘MANUAL OVERRIDE’ menu >Heating Loop Override
Electric Heater: The Heater Control % is directly proportional to a 0-10 VDC signal
being sent to the SCR controller in the electric heater’s control center.
000% = 0 VDC = 0 kW output
100% = 10 VDC = Maximum kW output
Indirect Gas Furnace: The Heater Control % is directly proportional to a 0-10 VDC
signal being sent to the indirect gas furnace control board. The first stage is full ON at a
1% Heater Control. Once the Heater Control reaches 50%, the second stage modulates
between 50% and 100% output.
001 – 049% First stage: ON, Second stage: OFF
050 – 100% First stage: ON, Second stage: Modulating between
50% and 100% output
Hot Water Heater: The heating control valve (supplied by others) can either be 0-10 VDC
or 2-10 VDC depending upon what valve is installed. The user may have to adjust the
‘I/O SETUP’ menu so that a 0-100% heating correlates with a 2-10 VDC signal (0-10 VDC
is default).
To adjust: ‘I/O SETUP’ menu >Analog Output Y2
T HE UNIT CONTAINS A WHEEL PRESSURE DROP SENSOR TO INDICATE WHETHER
THE PRESSURE ACROSS THE WHEEL IS
N
ORMAL OR
H
IGH
.
This screen only appears if a frost control method was provided.
A status of High is an indication of frost accumulation. The pressure set point is
adjustable on the wheel pressure switch.
T
HIS SCREEN INDICATES WHETHER THE ELECTRIC PREHEAT FROST CONTROL IS ON
OR OFF
.
This screen only appears if Electric Preheat frost control was provided.
To override: ‘MANUAL OVERRIDE’ menu >Energy Recovery Wheel Preheater
UNIT STATUS MENU - continued
T HIS SCREEN DISPLAYS THE COOLING CONTROL AS A PERCENTAGE ( CONTINUED )
The Compressor line indicates which compressor is ON
1
First compressor
2 Second compressor
1 2 Both compressors
To override: ‘MANUAL OVERRIDE’ menu >Cooling Loop Override
“STATUS LINE”
Cooling Control:000%
Compressor: ##