Refrigerant Lines - Carrier 619FB Service Manual

REFRIGERANT LINES

General refrigerant line sizing:
1 The 619FB/538FR 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),
consult the long- -line section on this page for proper charge
adjustments.
2 Minimum refrigerant line length between the indoor and
outdoor units is 10 ft. (3 m).
3 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.
4 Both lines must be insulated. Use a minimum of 1/2- -in.
(12.7 mm) thick insulation. A closed- -cell insulation is
recommended in all long- -line applications.
5 Special consideration should be given to isolating
interconnecting tubing from the building structure. Isolate the
tubing so that vibration or noise is not transmitted into the
structure.
IMPORTANT: Both refrigerant lines must be insulated separately.
S The following maximum lengths are allowed:
System Size
Min. Piping Length ft (m)
Standard Piping
ft (m)
Length
Max. outdoor- -indoor
ft (m)
height difference
Max. Piping Length
with no additional ft (m)
refrigerant charge
Piping
Max. Piping Length ft (m)
Additional refrigerant
Oz/ft
charge (between
Standard – Max
(g/m)
piping length)
Gas Pipe (size - -
in
connection type)
Liquid Pipe (size - -
in
connection type)
Refrigerant Type
Refrigerant
Lbs
Charge Amount
(kg)
ADDITIONAL REFRIGERANT CHARGE TABLE
Total Line Length ft.
Unit Size
Min Max
9
12 10 82
18
Long Line Applications Units:
1 No change in line sizing is required.
2 Add refrigerant per Additional Charge table.
9K 12K 18k
(208- - 230V) (208- - 230V) (208- - 230V)
10 (3) 10 (3) 10 (3)
25 (7.6) 25 (7.6) 25 (7.6)
32.8 (9.9) 32.8 (9.9) 32.8 (9.9)
25 (7.6) 25 (7.6) 25 (7.6)
82 (25) 82 (25) 82 (25)
0.2 (18.6) 0.2 (18.6) 0.2 (18.6)
1/2 Flare 1/2 Flare 5/8 Flare
connection connection connection
1/4 Flare 1/4 Flare 1/4 Flare
connection connection connection
R410A R410A R410A
3.1 (1.4) 3.1 (1.4) 4.4 (2)
Additional Charge oz/ft. ft (m)
10- -25 (3- -8) >25- -82 (8- -25)
None 0.02
SYSTEM EVACUATION AND
CHARGING
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, connect manifold
gage charge hose to a charge port of the low side service
valve (see Fig. 14).
2 Connect charge hose to vacuum pump.
3 Fully open the low side of manifold gage (see Fig. 15).
4 Start 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.
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 as specified in the ADDITIONAL
REFRIGERANT CHARGE TABLE on this page.
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.
Refrigerant
Outdoor Unit
A
B
Service Valve
Fig. 14 – Service Valve
Manifold Gage
500 microns
Low side valve
Charge hose
Low side valve
Fig. 15 – Manifold
13
Indoor Unit
Low Side C
D
High Side
High side valve
Charge hose
Vacuum pump