On- -Board Pressure Transducers; Energyx Control Board Leds; Major System Components - Carrier EnergyX 48HC Supplemental Installation Instructions

S Programmed occupancy schedule. Rooftop Unoccupied
S Rooftop indoor fan is off.
S The airflow sensor tubing connected to the incorrect
high/low sensor ports in the outside air.
Wheel Status (Option) —
NOTE: Wheel Status requires installation of the optional
wheel motion sensor.
This alarm will occur when the ERV wheel is turned on
and the wheel proxy sensor does not detect wheel motion
within the set time. It will open its contact which
energizes the normally closed rotation monitor relay. This
alarm will automatically reset when motion is detected.
Possible causes of this alarm are: the wheel belt breaking
or slipping, wheel motor failure, proxy sensor failure or
incorrect setting, or wiring error.

On- -board Pressure Transducers

The EXCB uses on- - board pressure transducers to measure
the air pressure of the incoming outside air and the
building exhaust air. The CFM values are then calculated
based on these readings and the fan speed. There is a
pressure transducer for the outside air and one for the
exhaust air. These are screwed into the EXCB board to
J24 and J25 respectively. They have three pins: IN, GND,
and OUT. The IN pin is 5vdc input power and GND is the
common or ground pin. The OUT pin will be 0.26 to
4.5vdc based on the pressure reading. There are two
different transducers used, two inch of water column
(inWC) and 5 inWC. Table 5 shows the voltage/pressure
characteristics of each.
LED COLOR DESCRIPTION
D9 Red 24vAC board power
D2 Green Run light Flashing
D12 Green ERV Wheel Status Alarm
D14 Green ERV Wheel Frost Protection
D16 Green ERV Dirty Filter Alarm
D18 Green ERV Blower Status Alarm
1 Requires installation of optional Wheel Motion sensor
2 Requires installation of optional Frost sensor
3 Requires installation of optional Filter sensor

EnergyX Control Board LEDs

The EnergyX Control Board (EXCB) has five green LEDs
and one red LED. The red LED is for power indication and
the green LEDs are status indicators (see Table 6 for details).
An EnergyX unit has a factory installed energy recovery
(ERV) device on a 48/50HC rooftop unit. The EnergyX
energy recovery unit is integrated into the base rooftop
unit construction and is factory wired. The energy
recovery unit contains a control box, supply fan, exhaust
fan(s), and an enthalpy wheel assembly. All control
operations of the ERV are based on the rooftop units
operation through communication with I/O Flex 6126. See
Fig. 7 and 8 for ERV wiring schematic and component
arrangement.
Table 6 – EXCB LED Indicators
1
2
3
15
Table 5 – Transducer/Voltage vs. Pressure
Pressure (inWC)
Voltage
(vDC)
2" transducer
<=--- 0.26 0
0.5 0.12
1 0.34
1.5 0.53
2 0.82
2.5 1.06
3 1.30
3.5 1.52
4 1.76
4.5 2.00

MAJOR SYSTEM COMPONENTS

STATUS IF LIGHT IS LIT
Board has power
ERV is Running
ERV Wheel not rotating when it should be
ERV detects frost on the wheel and running in Frost Mode
Dirty Filter
Fan Failure
5" transducer
0
0.28
0.87
1.46
2.05
2.64
3.23
3.82
4.41
5.00