Step 4 - Installing Ductwork - Carrier 40MBAB Installation Instructions Manual

40MBAB: Installation Instructions
11. The evaporator is assembled in place.
Fig. 25 — The evaporator is assembled in place
12. Use cable ties to fix the room temperature sensor.
Fig. 26 — Use cable ties to fix the room temperature
13. Reinstall evaporator cover plate.
Fig. 27 — Reinstall evaporator cover plate
14. Connect the wire according to the wiring diagram.
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
cable
ties
sensor
15. Reassemble the upper cover and reinstall the filter and filter cover
plate.
Fig. 28 — Reassemble the upper cover and filter
CAUTION
CAUTION FOR ALL PIPE INSTALLATIONS
The drainpipe is used to drain water away from the unit. If the
drainpipe is bent or installed incorrectly, water may leak and cause
a water-level switch malfunction.
In HEAT mode, the outdoor unit discharges water. Ensure that the
drain hose is placed in an appropriate area to avoid water damage
and icy conditions on walkways.
DO NOT pull the drainpipe forcefully, doing so may disconnect it.
NOTE: If installed above a finished living space, a secondary drain
pan (as required by many building codes), must be installed
under the entire unit and its condensate drain line must be
routed to a location such that the user witnesses the
condensate discharge.

Step 4 - Installing Ductwork

Connect the supply-air duct over the outside of the 3/4in (19 mm) flanges
provided on the supply-air opening. Secure the duct to the flange, using
proper fasteners for the type of duct used, and seal duct-to-unit joint. If
the return-air flanges are required, install the factory-authorized accessory
kit.
Use flexible connectors between the ductwork and unit to prevent
transmission of vibration. When the electric heater is installed, use heat-
resistant material for the flexible connector between the ductwork and the
unit at the discharge connection. Ductwork passing through the
unconditioned space must be insulated and covered with a vapor barrier.
Units equipped with 20kW or greater electric heaters require a 1in
(25mm) clearance to combustible materials for the first 36in (914mm) of
supply duct. Follow the local codes.
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