6
5. Maintenance and Service
(cont’d)
5.2 Annual Maintenance
Annual maintenance should include:
A
IR
F
ILTERS
Vacuum and wash standard foam filters. Replace medium efficiency
filter if present.
D
RAIN
P
ANS
AND
I
NTERIOR
OF
U
NIT
Wash the foil faced insulation surfaces and wipe the drain pans
with a soft cloth and mild cleaning solution. Check the drain fittings
to ensure they are draining freely.
H
EAT
R
ECOVERY
C
ORE
The heat recovery core must be handled with care. It is
recommended that it be washed once a year following the season
of most intense use, in order to ensure maximum efficiency of the
partitions.
Allow the heat recovery core to soak for three hours in warm water
and mild soap. Rinse under a heavy stream of water.
ERV HM C
ORE
For ERV HM core, use a vacuum cleaner or low pressure air jet.
It is not recommended to use solvents or detergents as these may
damage the media or structure of the core.
F
ANS
Blower wheels and fan housing should be checked for dirt build-up.
If they appear dirty, it may be necessary to remove the blower
assembly and then vacuum the dust out through the fan mouth.
See next column for instructions on removing the blower assembly.
S
YSTEM
O
PERATION
C
HECK
Verification of all control modes should be checked to ensure proper
operation. Refer to 3.2 Sequence of Operation section.
T
ESTING
AND
R
EPLACEMENT
OF
THE
D
AMPER
A
CTUATOR
Check damper operation by switching between LOW - COM or
HIGH - COM on the dry contact terminal or by switching through
the modes on the optional remote wall control. If the damper does
not respond in one or both directions, check all connections.
7000 unit ONLY:
Check for 24 volt output between the WHITE/RED
and the WHITE/ORANGE wires at the damper motor. If 24 volts
can be measured at the damper motor, the problem is either in the
connections, the defrost relay or the main circuit board.
6LC, V6LC/12LC, V12LC units ONLY:
(CAUTION: 120 VAC)
Check
for 120 volt output across the WHITE/BLACK wires. If 120 volts
can be measured at the motor, replace the motor. If 120 volts cannot
be measured at the motor, check pins J1-9 at the printed circuit
board.
WARNING
!
Disconnect power before maintaining unit.
CAUTION
Hot water and a strong cleaning agent could damage
the polypropylene core. Ensure the core is returned to
the unit in the correct orientation. Use the sticker as a
guide.
M
AIN
C
IRCUIT
B
OARD
R
EPLACEMENT
The main circuit board must be replaced if an electronic problem
arises. For example, the unit suddenly stops, the unit stays in
defrost all of the time or if control functions are not working properly.
Ensure that power is reaching the board. Test the blower motors
and damper actuators for operation when directly connected to the
appropriate power voltage. If the motor and damper actuators function
normally, replace the main circuit board.
M
OTOR
AND
B
LOWER
R
EMOVAL
AND
I
NSTALLATION
Disconnect power from the unit. To determine if the fan motor is
burned out, disconnect the four-wire service connector between
the motor and cabinet. Connect the motor directly to a 115 volts
power source with an electrical cable, as follows:
RED + WHITE
Low speed
BLUE + WHITE
Medium speed
BLACK + WHITE
High speed
If the motor functions normally, there is a problem with the wiring
connections or the main circuit board. Check all wiring and replace
main circuit board if necessary.
If the blower does not run, it must be replaced. To replace the motor,
remove the recovery core from the unit. Disconnect the
four-wire service connector from the unit. Remove the fasteners
holding the motor assembly in place. Lift the assembly up and
out, using one hand under the motor and one hand to steady it.
Remove the assembly carefully from the unit to avoid damage to the
insulation, shelf, etc. Install the repaired motor assembly by
following these instructions in reverse.
CAPACITOR
LOCKING PLATE
REMOVE THESE
TWO SCREWS
VD0004A
SERVICE CONNECTOR
THUMBSCREW
VD0001A
CAUTION
Do not soak the ERV HM core in water. This core can
easely be damaged especially if it is soaked.
6LC, V6LC, 12LC and V12LC units
7000 unit
