17
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. Re f riger ant line s shoul d not be buried in the ground. If i t i s
nece ssary to bury the lines , not more t han 36--in (914 mm)
should be buried. Provide a minimum 6--in (152 mm) vertica l
rise to the se rvice valves to prevent refrigera nt migr at i on.
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. Spe c ia l considerat i on s houl d be given to isola t ing
interconnecting tubing from the building structure. Isolate the
tubing s o tha t vi br at i on or noise does not tr ans m i t into the
structure.
IMPORTANT: Both refrigerant lines must be insulated
separately.
S The following maximum lengths are allowed:
Table 13 – Maximum Refrigerant Line Lengths
Unit Size
Max Line
Length* ft(m)
Max Elevation
(ID over OD) ft( m)
Max Elevation
(OD over ID) ft (m)
18K--56K 250 (76.2) 65 (19.8) 200 (61)
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.
Table14–PipeSizes
Indoor Units Outdoor Units
Indoor Unit Tube
Sizes (in)
TXV Kit Tube
Sizes (in)
Outdoor Unit Tube
Size (in)
Liquid Vap o r Liquid Vap o r Liquid Va p o r
40MKCB18F-- -- 3
24AHA418
124ANS018
3/8
5/8
3/8
5/8
3/8
5/8
40MKCB34F-- -- 3
24AHA424
124ANS024
3/4 3/4 3/4
40MKCB34F-- -- 3
24AHA430
124ANS030
3/4 3/4 3/4
40MKCB34F-- -- 3
24AHA436
124ANS036
3/4 3/4 7/8
40MKCB54F-- -- 3
24AHA448
124ANS048
3/4 7/8 7/8
40MKQB36F---- 3
25HHA430224A
NS030
3/4 3/4 3/4
40MKQB36F---- 3
25HHA436
224ANS036
3/4 3/4 7/8
40MKQB48F---- 3
25HHA448
224ANS048
3/4 7/8 7/8
Note: Both lines need to be insulated using at least 1/2 inch closed
foam insulation.
Refrigerant Charge
Table 15 – Charge Requirements
System
Ty p e
Nominal
Capacity
kBTU/Hr
Outdoor Unit Indoor Unit
Charge to
Sub--cooling
Delta from
Rating Plate
Va lu e
Cooling
Only
018 24AHA418A003 124ANS018000 40MKCB18F ----3 12
024 24AHA424A003 124ANS024000 40MKCB34F ----3 12
030 24AHA430A003 124ANS030000 40MKCB34F ----3 12
034 24AHA436A003/5/6 124ANS036000 40MKCB34F-- -- 3 8
054 24AHA448A003/5/6 124ANS048000 40MKCB54F-- -- 3 12
Heat
Pump
030 25HHA430A003 224ANS030000 40MKQB36C---- 3 11
036 25HHA436A003/5/6 224ANS036000 40MKQB36C----3 14
048 25HHA448A003/5/6 224ANS048000 40MKQB48C----3 11
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.
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
System Size
kBTU/hr
Cooling Only Heat Pumps
40MKCB**C 40MKQB**C 25HHA4/224ANS
018 TXV - -
024 TXV - -
030 TXV TXV 0.055"
034 TXV - -
054 TXV - -
036 - TXV 0.063"
048 - TXV 0.073"
SYSTEM EVACUATI ON 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.
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.
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.
3. Fully open the low side of manifold gage (see Fig. 19).
4. Start the vacuum pump.
5. Evacuate using either deep vacuum or triple evacuation
method.
6. After evacuation is complete, fully close the low side of
manifold gage and stop operation of vacuum pump.
Maintain a MICRON value of 500 MICRONS or less for 30
minutes to ensure a completely dry system.
7. The fac tory charge c ontaine d in the outdoor unit is good for up
to 25 ft. (8 m) of line le ngth. For refrigera nt li nes longer tha n
25 ft. (8 m), add cha rge, up to the maxi mum allowa ble 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
Indoor Uni
Refrigerant
Service Valve
Low Side
High Side
A
B
C
D
A07360
Fig. 18 Service Valve
To Next Page
Loading...
