Refrigerant Lines; System Evacuation And Charging; Metering Device; System Vacuum And Charge - Carrier 40MKCF Service Manual

REFRIGERANT LINES

General refrigerant line sizing:
3. The outdoor units are shipped with a full charge of R410A
refrigerant. All charges, line sizing, and capacities are based
on runs of 25 ft. (7.6 m). For runs over 25 ft. (7.6 m), refer
to the Residential Long Line Guide.
4. Minimum refrigerant line length between the indoor and
outdoor units is 10 ft. (3 m).
5. Refrigerant lines should not be buried in the ground. If it is
necessary to bury the lines, not more than 36- -in (914 mm)
should be buried. Provide a minimum 6- -in (152 mm) vertical
rise to the service valves to prevent refrigerant migration.
6. Both lines must be insulated. Use a minimum of 1/2- -in
(12.7 mm) thick insulation. Closed- -cell insulation is
recommended in all long- -line applications.
7. Special consideration
interconnecting tubing from the building structure. Isolate the
tubing so that vibration or noise does not transmit into the
structure.
IMPORTANT: Both refrigerant lines must be insulated
separately.
S The following maximum lengths are allowed:
Table 13 – Maximum Refrigerant Line Lengths
Max Line Max Elevation
Unit Size
Length* ft(m) (ID over OD) ft( m)
18K- -56K 250 (76.2)
Note: For lengths greater than 25 ft. (7.6 m), refer to the Residential
Long Line Guide.
*Maximum actual length not to exceed 200 ft. (61 m). Total equivalent
length accounts for losses due to elbows or fitting. See the Long Line
Guideline for details.
S The following are the piping sizes.
Table 14 – Pipe Sizes
Indoor Unit Tube
Sizes (in)
Indoor Units Outdoor Units
Liquid
24AHA418
40MKCB18F- - - - 3
124ANS018
24AHA424
40MKCB34F- - - - 3
124ANS024
24AHA430
40MKCB34F- - - - 3
124ANS030
24AHA436
40MKCB34F- - - - 3
124ANS036
3/8
24AHA448
40MKCB54F- - - - 3
124ANS048
25HHA430224A
40MKQB36F- - - - 3
NS030
25HHA436
40MKQB36F- - - - 3
224ANS036
25HHA448
40MKQB48F- - - - 3
224ANS048
Note: Both lines need to be insulated using at least 1/2 inch closed
foam insulation.
Refrigerant Charge
Table 15 – Charge Requirements
Nominal
System
Capacity Outdoor Unit
Type
kBTU/Hr
018 24AHA418A003
024 24AHA424A003
Cooling
030 24AHA430A003
Only
034 24AHA436A003/5/6
054 24AHA448A003/5/6
030 25HHA430A003
Heat
036 25HHA436A003/5/6
Pump
048 25HHA448A003/5/6
The above additional charge is required amount for line lengths up to
25 ft. (7.6 m). For line lengths exceeding 25 ft. (7.6 m), additional
charge will be required. Refer to the Residential Long Line Guide.
should be given to isolating
Max Elevation
(OD over ID) ft (m)
65 (19.8) 200 (61)
TXV Kit Tube Outdoor Unit Tube
Sizes (in) Size (in)
Vapor Liquid Vapor Liquid Vapor
5/8 5/8
3/4 3/4
3/4 3/4
3/4 3/4
3/8 3/8
3/4 7/8
3/4 3/4
3/4 3/4
3/4 7/8
Charge to
Sub- - cooling
Indoor Unit Delta from
Rating Plate
Value
124ANS018000 40MKCB18F- - - - 3 12
124ANS024000 40MKCB34F- - - - 3 12
124ANS030000 40MKCB34F- - - - 3 12
124ANS036000 40MKCB34F- - - - 3 8
124ANS048000 40MKCB54F- - - - 3 12
224ANS030000 40MKQB36C- - - - 3 11
224ANS036000 40MKQB36C- - - - 3 14
224ANS048000 40MKQB48C- - - - 3 11

Metering Device

The 40MKC(Q)*F unit uses a TXV. The outdoor unit uses a type
B accurator. The cooling metering device is installed with the
indoor unit, while the heating metering device is installed with the
outdoor unit. One metering device is required for the cooling only
system and two are required for the heat pump systems. Refer to
Table 16 for a breakdown of each unit's metering devices.
Table 16 – Metering Device
Cooling Only
System Size
kBTU/hr
018
024
030
034
054
036
048
SYSTEM EVACUATION AND
CHARGING
!
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, connect manifold
gage charge hose to a charge port of the low side service
valve (see Fig. 18).
2. Connect charge hose to vacuum pump.
5/8
3. Fully open the low side of manifold gage (see Fig. 19).
3/4
4. Start the vacuum pump.
3/4
5. Evacuate using either deep vacuum or triple evacuation
7/8
method.
7/8
6. After evacuation is complete, fully close the low side of
3/4
manifold gage and stop operation of vacuum pump.
Maintain a MICRON value of 500 MICRONS or less for 30
7/8
minutes to ensure a completely dry system.
7/8
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 charge, up to the maximum allowable length,
as specified in the residential Long Line Application Guide.
8. Disconnect charge hose from charge connection of the low
side service valve.
9. Fully open service valves B and A.
10. Securely tighten caps of service valves.
Outdoor Unit
Service Valve
17
Heat Pumps
40MKCB**C 40MKQB**C 25HHA4/224ANS
TXV -
TXV -
TXV TXV
TXV -
TXV -
- TXV
- TXV
CAUTION
Indoor Unit
Refrigerant
Low Side
A
B High Side
Fig. 18 Service Valve
-
-
0.055"
-
-
0.063"
0.073"
C
D
A07360