Daikin LCBKQ3AV1, Installation Manual, Page: 9 / 14

English 7
〈
Closing method
〉
1. Remove the valve cover and turn the shaft clockwise with a hexa-
gon wrench.
2. Tighten the shaft until the shaft comes in contact with the sealing
part of the valve.
3. Tighten the valve cover securely. Refer to the above table for the
tightening torque according to the size.
〈
Handling Precautions for Valve Cover
〉
• Be careful not to damage the sealing part.
• At the time of mounting the valve cover, apply a screw lock agent
to the screw thread.
• Do not apply a screw lock agent (for flare nut use) to the sealing
part.
• Be sure to tighten the valve cover securely after operating the
valve. Refer to “ Operation Method of Shutoff Valves ” for the
tightening torque of the valve.
〈
Handling Precautions for Service Port
〉
• Work on the service port with a charge hose provided with a push-
ing rod.
• At the time of mounting the cap, apply a screw lock agent to the
screw thread.
• Do not apply a screw lock agent (for flare nut use) to the sealing
part.
• Be sure to tighten the cap securely after the work. Refer to “ Oper-
ation Method of Shutoff Valves ” for the tightening torque of the
cap.
CAUTION
Apply a screw lock agent to the valve cover mount and the
screw thread of the service port.
Otherwise, dew condensation water will intrude inside and freeze.
Therefore, refrigerant gas leakage or a compressor malfunction may
result from the cap deformation or damage.
5-5 Air Tight Test / Vacuum Drying
Ensure the following tests have been conducted after piping.
• Check that the gas side and liquid side shutoff valves are open.
• Air tight test - Always use the nitrogen gas.
Pressurize the high pressure side (liquid side) to the design pres-
sure (3.8MPa) of the outdoor unit and pressurize the low pressure
side (suction side) to the design pressure (2.5MPa) of the indoor
unit (field supplied).
In this case, they shall be accepted if no pressure drop is found for
24 hours through pressurization at least 5 minutes from the port
A
and the liquid shutoff port shown in the right figure.
Check if there are any leakage areas in the case of pressure drop.
• Vacuum drying - Refer to the installation manual of the outdoor
unit.
5-6 Thermal Insulation for Piping
• Always insulate connection pipes and branch pipes on the dis-
charge, suction and liquid sides.
The liquid and gas pipe temperature are as follows:
Liquid pipe arrival minimum temperature:
5°C (For outdoor unit)
-10°C (To indoor unit)
Gas pipe arrival minimum temperature
-45°C (For indoor unit)
100°C (To outdoor unit) (Max. temperature)
• Use a discharge pipe whose heat resistance is 120ºC or more as
its maximum temperature reaches about 100ºC. Use a suction
pipe and liquid pipe whose heat resistance is 80ºC as the stan-
dard specification.
• Refer to the installation manual attached to the outdoor unit for the
outdoor unit side.
CAUTION
• Always insulate the pipe joint for onsite piping.
(An exposed pipe can cause dew condensation and burn by con-
tact.)
Screw thread
Apply a screw lock agent
Sealing part
Not apply a screw lock agent
Shutoff valve
Part of mounting the
valve cover.
Valve cover
Sealing part
Not apply a screw
lock agent
Screw thread
Apply a screw lock
agent
Cap
Port
A
Liquid side shutoff
valve port
Insulation (field supply)
Connect piping up to the
joint so that piping may not
be exposed.
(Heat resistance: 120ºC or more)
Insulation (field supply)
Liquid piping inlet
(between booster unit and
main liquid pipe)
Liquid piping outlet (between
booster unit and refrigeration
showcase)
Suction pipe
Discharge pipe