Refrigerant Piping Connection; Evacuating; Wiring Connection; Tightening Connection - Carrier 42UQV050M Series Installation Manual

Refrigerant Piping Connection

Flaring
1. Cut the pipe with a pipe cutter.
90
2. Insert a flare nut into the pipe and flare the pipe.
• Projection margin in flaring : A (Unit : mm)
Rigid (clutch type)
Outer dia.
R410A tool used
of copper pipe
∅6.35 mm
0 to 0.5
∅12.70 mm
0 to 0.5
Imperial (wing nut type)
A
Outer dia. of copper pipe
∅6.35 mm
Die
Pipe
∅12.70 mm

Tightening connection

Align the centers of the connecting pipes and tighten the flare nut as far as
possible with your fingers. Then tighten the nut with a spanner and torque
wrench as shown in the figure.
Half union
Externally
threaded side
Use a wrench to secure. Use a torque wrench to tighten.
CAUTION
Do not apply excess torque. Otherwise, the nut may crack depending on
the conditions.
Outer dia. of copper pipe
∅6.35 mm
∅12.70 mm
• Tightening torque for connection of flare pipe
The pressure of R410A is higher than R22.
(Approx. 1.6 times.) Therefore securely
tighten the flare pipes which connect the
outdoor unit and the indoor unit with the
specified tightening torque using a torque
wrench. If any flare pipe is incorrectly
connected, it may cause not only
a gas leakage but also trouble in the
refrigeration cycle.

Evacuating

After the piping has been connected to the indoor unit, you can perform
vacuuming together at once.
AIR PURGE
Evacuate the air in the connecting pipes and in the indoor unit using a
vacuum pump. Do not use the refrigerant in the outdoor unit. For details, see
the manual of the vacuum pump.
Using a vacuum pump
Be sure to use a vacuum pump with counter-flow prevention function so
that inside oil of the pump does not flow backward into pipes of the air
conditioner when the pump stops.
(If oil inside of the vacuum pump enters the air conditioner, which use
R410A, refrigeration cycle trouble may happen.)
Obliquity Roughness Warp
Conventional
tool used
1.0 to 1.5
1.0 to 1.5
R410A
1.5 to 2.0
2.0 to 2.5
Flare nut
Internally
threaded side
(Unit : N·m)
Tightening torque
14 to 18 (1.4 to 1.8 kgf·m)
50 to 62 (5.0 to 6.2 kgf·m)
Flare at
indoor unit side
Flare at
outdoor unit side
1. Connect the charge hose from the manifold valve to the service port of
the packed valve at gas side.
2. Connect the charge hose to the port of the vacuum pump.
3. Open fully the low pressure side handle of the gauge manifold valve.
4. Operate the vacuum pump to start evacuating. Perform evacuating for
about 15 minutes if the piping length is 20 meters. (15 minutes for 20
meters) (assuming a pump capacity of 27 liters per minute) Then confirm
that the compound pressure gauge reading is –101 kPa (–76 cmHg).
5. Close the low pressure side valve handle of the gauge manifold valve.
6. Open fully the valve stem of the packed valves (both gas and liquid sides).
7. Remove the charging hose from the service port.
8. Securely tighten the caps on the packed valves.
Compound pressure gauge
–101 kPa (–76 cmHg)
Handle Lo
Charge hose
(For R410A only)
Connecting pipe
Packed valve at gas side
Service port (Valve core (Setting pin))
Packed valve at liquid side
CAUTION
• KEEP IMPORTANT 5 POINTS FOR PIPING WORK.
(1) Take away dust and moisture (inside of the connecting pipes).
(2) Tighten the connections (between pipes and unit).
(3) Evacuate the air in the connecting pipes using a VACUUM PUMP.
(4) Check gas leak (connected points).
(5) Be sure to fully open the packed valves before operation.
Packed valve handling precautions
• Open the valve stem all the way out, but do not try to open it beyond the
stopper.
Pipe size of Packed Valve
12.70 mm and smallers
15.88 mm
• Securely tighten the valve cap with torque in the following table :
Cap Cap Size (H ) Torque
14~18 N·m
H17 - H19
(1.4 to 1.8 kgf·m)
Valve Rod
Cap
33~42 N·m
H22 - H30
(3.3 to 4.2 kgf·m)
8~12 N·m
H14
(0.8 to 1.2 kgf·m)
Service
Port Cap
14~18 N·m
H17
(1.4 to 1.8 kgf·m)

Wiring Connection

1. Remove the valve cover, the electric parts cover and the cord clamp from
the outdoor unit.
2. Connect the connecting cable to the terminal as identified by the matching
numbers on the terminal block of indoor and outdoor unit.
3. Insert the power cord and the connecting cable carefully into the terminal
block and secure it tightly with screws.
4. Use vinyl tape, etc. to insulate the cords which are not going to be used.
Locate them so that they do not touch any electrical or metal parts.
5. Secure the power cord and the connecting cable with the cord clamp.
6. Attach the electric parts cover and the valve cover on the outdoor unit.
8
Pressure gauge
Manifold valve
Handle Hi
(Keep full closed)
Charge hose
(For R410A only)
Vacuum pump adapter for
counter-flow prevention
(For R410A only)
Vacuum
pump
Size of Hexagon wrench
A = 4 mm
A = 5 mm
Hexagon wrench
is required.
A
H
Service Port Cap
Valve Rod Cap
Carrier 1110651814 (EN)