Carrier 42CT Series Manual page 13

5.3. Condensate drain
Coil surface condensation formed during the cooling cycle is collected in a
pan purposely placed under the coil and then drained out through a drain pipe
fitted on the coil connection side. A simple flexibil tube which fits
recommended.
To facilitate correct condensate draining, make sure that the drain pipe is not
bent or restricted and that it has the required slope (at least 2%) along its length.
5.4. Checking
Before unit operation verify that the water flows into the internal condensate
drain pan by pouring some water into it.
If problems are detected, check the drain pipe slope and look for possible
obstructions.
5.5. Water connections
In/Out connection is 3/4" FPT, drain connection is 3/4" MPT,
The water pipe connect with header should be flexible, and use PTFE TAPE
to seal. The installation torque shouldn't be larger than 60Nm, or may cause
the header to be broken and leakage,
All the connection pipes must be insulated with a condensation-proof
material such as polyurethane, propylene or neoprene of 5 mm to 10 mm
thickness,
Before start-up, blow off all the air in coil through the air vent valve. The air
in tube will result the reduction of the capacity and the abnormal noise in
the coil.
Water
Outlet
Water
Inlet
Air Vent
Valve
13
19 mm is