Remote Control Installation; System Vacuum And Charge - Carrier 40MBC/38MAQ Installation Instructions Manual

REMOTE CONTROL INSTALLATION

Mounting Bracket (if installed on the wall)
1. Use the two screws supplied with the control to attach the
mounting bracket to the wall in a location selected by the
customer and within operating range.
2. Install the remote control batteries.
3. Place the remote control into the remote control mounting
bracket.
4. For remote control operation, refer to the unit owner's
manual.
CAUTION
!
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.
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.

SYSTEM VACUUM AND CHARGE

Using Vacuum Pump
1. Completely tighten flare nuts A, B, C, D and connect the
manifold gage charge hose to a charge port of the low side
service valve (see Fig. 38).
2. Connect the charge hose to the vacuum pump.
3. Fully open the low side of the manifold gage (see Fig. 39).
4. Start the vacuum pump.
5. Evacuate using either the deep vacuum or triple evacuation
method.
6. After evacuation is complete, fully close the low side of the
manifold gage and stop the vacuum pump operation.
7. The factory charge contained in the outdoor unit is good for
up to 25 ft. (8 m) of the 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 the charge connection of
the low side service valve.
9. Fully open service valves B and A.
10. Securely tighten the service valves caps.
Outdoor Unit
A
B
Service Valve
Fig. 38 --- Service Valve
Indoor Unit
Refrigerant
Low Side C
D
High Side
A07360
Manifold Gage
500 microns
Low side valve
Charge hose
Low side valve
Fig. 39 --- Manifold
Deep Vacuum Method
The deep vacuum method requires a vacuum pump capable of
pulling a vacuum of 500 microns and a vacuum gage capable of
accurately measuring this vacuum depth. The deep vacuum
method is the most positive way of assuring a system is free of air
and liquid water (see Fig. 40).
5000
4500
4000
3500
3000
2500
2000
1500
1000
500
0 1 2
MINUTES
Fig. 40 --- Deep Vacuum Graph
Triple Evacuation Method
The triple evacuation method should only be used when the
vacuum pump is only capable of pumping down to 28 in. of
mercury vacuum and the system does not contain any liquid water.
Refer to Fig. 41 and proceed as follows:
1. Pump the system down to 28 in. of mercury and allow the
pump to continue operating for an additional 15 minutes.
2. Close the service valves and shut off the vacuum pump.
3. Connect a nitrogen cylinder and regulator to the system and
open until the system's pressure is 2 psig.
4. Close the service valve and allow the system to stand for 1
hr. During this time, dry nitrogen will be able to diffuse
throughout the system absorbing moisture.
5. Repeat this procedure as indicated in Fig. 41. The system
will then be free of any contaminants and water vapor.
17
High side valve
Charge hose
Vacuum pump
A07361
LEAK IN
SYSTEM
VACUUM TIGHT
TOO WET
TIGHT
DRY SYSTEM
3 4 5 6 7
A95424