Carrier 38MGQD27 3 Series - DRAIN CONNECTIONS; Install the outdoor unit drain joint; SYSTEM VACUUM AND CHARGE

15
DRAIN CONNECTIONS
Install drains must meet local sanitation codes.
Install the outdoor unit drain joint
Fit the seal into the drain joint, then insert the drain joint into the
base pan hole of the outdoor unit. Rotate 90
_ to securely assemble
them. Connect the drain joint with an extension drain hose to avoid
condensate from draining off the outdoor unit during the heating
mode.
Seal
Base pan hole
Drain joint
Seal
Base pan
Drain
joint
Fig. 16 - Drain Joint
Images are for illustration purposes only.
SYSTEM VACUUM AND CHARGE
UNIT DAMAGE HAZARD
Failure to follow this caution may result in equipment
damage or improper operation.
Never use the system compressor as a vacuum pump.
CAUTION
!
Refrigerant tubes and indoor coil should be evacuated using the
recommended deep vacuum method of 500 microns. The alternate
triple evacuation method may be used if the procedure outlined
below is followed. Always break a vacuum with dry nitrogen.
NOTE: All units have a Master Suction and Liquid Line Service
Valve (excluding the 18,000 BTU unit).
1. Completely tighten the flare nuts A, B, C, D, E. Fully open
all circuits service valves, connect the manifold gage charge
hose to the charge port of the low side Master service valve
to evacuate all circuits at the same time (see Fig. 17).
2. Connect the charge hose to the vacuum pump.
3. Open (fully) the low side of the manifold gage (see Fig. 18).
4. Start the vacuum pump.
5. Evacuate using either deep vacuum or triple evacuation
method.
6. After the evacuation is complete, fully close the low side of
manifold gage and stop operation of vacuum pump.
7. The factory charge contained in the outdoor unit is good for
up to 25 ft. (8 m) of line length. For refrigerant lines longer
than 25 ft. (8 m), add refrigerant, up to the allowable length,
as specified in the System Requirements section.
8. Disconnect the charge hose from charge connection of the
low side service valve.
9. Securely tighten caps of service valves.
Outdoor Unit
Indoor Uni
t
Refrigerant
Service Valve
Low Side
High Side
A
B
C
D
A07360
Fig. 17 - Service Valve
Manifold Gage
500 microns
Low side valve
High side valve
Charge hose
Charge hose
Vacuum pump
Low side valve
A07361
Fig. 18 - Manifold