6
ATH15-520.2
WARNING
1. The power supply wiring for the Energy Recovery
Module, model ERM, comes from a single point power
connection on the main ventilation unit, model MPR.
Disconnect power supply at model MPR before making
wiring connections or servicing this equipment. Follow
all applicable safety procedures to prevent accidental
power up. Failure to do so can result in injury or death
from electrical shock or moving parts and may cause
equipment damage.
2. When the dead front disconnect switch(es) (for main unit
model MPR and/or powered convenience outlet option) is
in the “OFF” position, supply power remains energized at
the line (supply) side of the dead front disconnect
switch(es). The switch body is located inside of another
junction box to protect against contact with the live wiring.
The junction box must not be disassembled unless the
main power supply from the building to the unit is
de-energized.
3. For units equipped for dual power supply sources, both
sources of power must be disconnected to prevent
electrical shock and equipment damage.
4. All units must be wired strictly in accordance with
the wiring diagram furnished with the unit. Any wiring
different from the wiring diagram could result in a hazard
to persons and property.
5. Any original factory wiring that requires replacement
must be replaced with wiring material having a
temperature rating of at least 105°C.
6. Ensure that the supply voltage to the unit, as indicated
on the serial plate, is not 5% greater than rated voltage.
ELECTRICAL CONNECTIONS
1. Installation of wiring must conform with local building
codes, or in the absence of local codes, with the National
Electric Code ANSI/NFPA 70 - Latest Edition. Unit must
be electrically grounded in conformance to this code. In
Canada, wiring must comply with CSA C22.1, Part 1,
Electrical Code.
2. Two copies of the job specific wiring diagram are provided
with each unit, one permanently affixed to the inside of the
door of the controls compartment and the other as a loose
copy with the literature packet that ships with the unit.
Refer to this diagram for all wiring connections.
CAUTION
Ensure that the supply voltage to the unit, as indicated on the
serial plate, is not 5% less than the rated voltage.
Electrical Connections
3. Once both the MPR unit and ERM unit are mated, the pre-
wired power and control wires in the MPR unit are to be
routed through the inside of the duct transition and into the
control compartment in the ERM unit (refer to Figure 9.1).
4. The ERM unit does not require a separate electrical power
supply. The power wiring from the MPR unit is sized for the
power requirements of the ERM unit. The units must be
protected with a fused or circuit breaker disconnect switch
based on the MCA and MOP ratings on the serial plate of
the MPR unit, which includes the ERM unit.
5. Make sure all multi-voltage components (motors,
transformers, etc.) are wired in accordance with the power
supply voltage.
6. The power supply must be within 5% percent of the voltage
rating and each phase must be balanced within 2 percent
of each other. If not, advise the utility company.
