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14
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SERVICING
Control Configuration-
For use by qualified service personnel only
The adjustable control switches are located at the PCB.The inputs are only visible and accessible
with the electric control box removed from the unit.
side screws
side screws
PCB in the electric
cont
ro
l case
PCB
1 2 3 4 5 6 7 8
S1
OFF
ON
1
2
3
4
5
6
7
8
S
1
SW1
1
2
3
4
SW1
1 2 3 4
OFF
ON
Before servicing, switch power off at the
service panel and lock the area to prevent
power from being switched on accidentally.
When the area cannot be locked securely
fasten a prominent warning device, such
as a tag to the service panel.
WARNING
NOTE:
We strongly recommend that any
servicing be performed by a qualified
individual.
For ease of service. the unit can be
removed from the case:
1. Remove the front case panel.
2. Unplug the power cord.
3. Raise the top duct by turning all four
case top duct adjusting screws
counterclockwise.
4.
Remove the case-to unit grounding
screws.
5. Slide the unit out o
f the case.
unit, multiple
Most installations will have their established means to ensure adequate fresh air supply to the building.
However, a manually-removable vent door (screwed shut) has been provided to open up an outdoor/
indoor air path within the unit, if desired. There is a mesh screen present for when the unit is operated
with the vent door removed. Do not discard the vent door in case it desired to be put back in place during
routine maintenance and/or seasonal changeovers. A vent air flow rate will not be published as it varies
based on too many operational and situational influences. Also be aware that outdoor noises will travel
more easily into the indoor space when the vent door is removed.
If desired, remove the vent door as follows:
Step2: Remove
the
sealing
plate
Step1: Remove the
upper screw
