Carrier 40MBDQ09 3 Series Installation Instructions Manual page 11

Remove the cap from connector C and connect the condensate
drain pipe to drain connector C. (see Fig. 25).
NOTE: For size 18, the External Condensate lift pump should be
removed (see Fig. 24).
Fig. 24 − Sizes 9, 12, 18 with External Condensate Lift Pump
Fig. 25 − Sizes 24 to 48 with Built−in Condensate Lift Pump
DRAINAGE TEST FOR UNITS WITHOUT A
CONDENSATE LIFT PUMP
Check that the drainpipe is unhindered. Fill the drain pan with 0.5
gallons (2 liter) of water.
Stow tube
Fig. 26 − Units without a Pipe
CONDENSATE LIFT PUMP AND DRAINAGE TEST
Follow these steps to perform the test:
1. Remove the test cover by rotating it counter−clockwise as
shown in Fig. 27.
2. Using a piece of tubing or pipe, fill the condensate lift pump
reservoir with 70 oz. of water (see Fig. 28).
3. Turn the unit ON in cooling mode. The condensate lift
pump comes on. Watch the end of the drain pipe for any
water. It may take some time for the water to travel,
depending on the length of the drain pipe.
4. During this test, check all bends or joints for leakage.
Connector C
Connector C
Condensate Lift Pump Maintenance
11
Fig. 27 − Check the Bends and Joints for Leakage
Fig. 28 − Tube/Pipe Insert
1. Remove the four screws from the drain pump (sizes 24 to 48).
2. Unplug the pump power supply and water level switch
cable.
3. Detach the pump.
Fig. 29 − Detach the Pump
A150675
Pump