7
ATH15-520.2
1. Turn off power to the unit at the disconnect switch at the
MPR unit. Check that fuses or circuit breakers are in place
and sized correctly.
2. Open the controls compartment and blower access doors.
3. Check that the supply voltage matches the unit supply
voltage listed on the Unit Serial Plate. Verify that all
wiring is secure and properly protected. Trace circuits to
insure that the unit has been wired according to the wiring
diagram.
4. Check to see that there are no obstructions to the intake
and discharge of the unit.
5. Check the belt tension and sheave alignment for the
exhaust blower.
6. All bearings are permanently lubricated and do not require
lubrication.
7. Check to make sure that all filters are in place and that
they are installed properly according to direction of air flow.
8. Perform a visual inspection of the unit to make sure no
damage has occurred during installation.
START-UP PROCEDURE
IMPORTANT
1. On units with the electric preheat option, to prevent
premature heat exchanger failure, check to be sure the
blower has been set to deliver the proper airflow for the
application. Refer to page 8 for Blower Adjustments.
2. Start-up and adjustment procedures should be performed
by a qualified service agency.
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 working on 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.
WARNING
General
9. Turn on power to the unit at the disconnect switch at the
MPR unit.
Note:
The unit includes a door switch installed inside the
exhaust blower section access door. When the
door is opened, the switch interrupts power to a
microprocessor controller input and the exhaust
blower motor is de-energized.
10. Check the Carel microprocessor controller and exhaust
fan motor for electrical operation. If this does not function,
recheck the wiring diagram. Check to insure none of the
Control Options have tripped.
11. Check to make sure that the economizer wheel bypass
damper (if equipped) opens properly without binding.
12. Check the blower wheel for proper direction of rotation
when compared to the air flow direction arrow on the
blower housing. Blower wheel rotation, not air movement,
must be checked as insufficient air will be delivered with
the blower wheel running backwards.
13. Check the blower speed (rpm). Refer to Blower
Adjustments for modification.
14. Check the motor speed (rpm).
15. Check the motor voltage. Check to make sure all legs are
in balance.
16. Check the motor amp draw to make sure it does not
exceed the motor nameplate rating. Check all legs to
insure system is balanced.
17. Check that the energy recovery wheel rotates in the
direction of the arrow without interference noise (scraping,
brushing, banging etc.). The wheel is factory set to rotate at
approximately 40 RPM to maximize latent heat transfer.
18. Check that the belt is situated near the middle of the wheel
rim, not against the rim support, and that the belt is not
flipped.
19. Check the energy recovery wheel voltage and amp draw to
make sure it does not exceed the motor nameplate rating.
