Drain Piping Work - Daikin FXZQ20MVE Installation Manual

• Nitrogen should be set to 0.02 Mpa (0.2 kg/cm
nitrogen into the piping. (Refer to Fig.15)
Refrigerant piping
• Make absolutely sure to execute heat insulation works on the pipe-connecting section after checking gas
leakage by thoroughly studying the following figure and using the attached heat insulating materials for fit-
ting (8) and (9). (Fasten both ends with the clamps (4).)
(Refer to Fig. 16)
• Wrap the sealing pad (11) only around the insulation for the joints on the gas piping side.
(Refer to Fig. 16)
Liquid piping
CAUTION
Be sure to insulate any field piping all the way to the piping connection inside the unit. Any exposed piping
may cause condensation or burns if touched.

7. DRAIN PIPING WORK

(1) Carry out the drain piping
• Lay pipes so as to ensure that drainage can occur with no problems.
• Employ a pipe with either the same diameter or with the diameter larger (excluding the raising section)
than that of the connecting pipe (PVC pipe, nominal diameter 20 mm, outside diameter 26 mm).
• keep the drain pipe short and sloping downwards at a gradient of at least 1/100 to prevent air pockets from
forming.
• If the drain hose cannot be sufficiently set on a slope, refer to PRECAUTIONS FOR DRAIN RAISING PIP-
ING on page 11.
• To keep the drain hose from sagging, space hanger bracket every 1 to 1.5 m.
Hanger bracket
GOOD
Fig. 17
10
Part to be
brazed
Nitrogen
Fig. 15
Small sealing pad
(attached) (11)
(Wrap the piping union
with the sealing pad.)
Clamp (4)
(Big 4)
(attached)
Gas piping
1/100
gradient or more
) with a pressure-reducing valve if brazing while inserting
2
Taping
hands valve
Nitrogen
Insulation for fitting
(attached) (9)
(for liquid pipe)
Insulation for fitting (attached) (8)
(for gas pipe)
Fig. 16
WRONG
Pressure-reducing valve
WRONG
Fig. 18
English