Caution At Installation; Refrigerant Piping - Daikin FXVQ125MY1 Installation Manual

5. CAUTION AT INSTALLATION

5-1 HOW TO REPLACE PULLEY
<125-250 type>
(1) Remove the suction grille.
(2) Remove the protection net. Then remove the cushioning
material on the protection net.
(3) Remove the front panel (upper).
(4) Remove the front panel (lower).
(5) Put the iron plate, which must be wider than the fan
motor, under the fan motor, and on the heat exchanger
for protection for its fin. (Iron plate must be supplied in the
field.)
(6) Remove the terminal for the fan motor lead wire from the
magnet switch.
(7) Pull out the fan motor lead wire to the fan housing parts,
and let it out of the unit from the opening part on the front
plate (upper).
(8) Remove the nuts of the motor base.
(9) Remove the belt. Hold the fan motor base firmly when
working so that it may not move suddenly.
(10) Slide the fan housing assembly on the iron plate on which
the fan motor is put (the above procedure (5)) frontward
slowly. Work must be conducted by more than 3 persons.
One of them must hold the motor base, and two or more
of them must hold the fan housing.
(11) Move the fan housing assembly to the location where can
be worked and replace the pulley.
(12) After replacing, follow the above procedure in the reverse
order.
<400 · 500 type>
Follow the above procedure (1)-(4), (6), (7), (10), (11), (12) in
the order.
( 2 ) Protection net
( 3 ) Front panel
( upper )
( 1 ) Suction
grille
( 4 )
Front panel
( lower )
Fan motor lead wire
5-2 PARALLELISM OF PULLEY
• Adjust the parallelism of the pulley between the fan and
the motor so as to meet the standard as below.
Fan pulley
K
K
K (arc-minute)
Parallelism Less than 10
English
( 5 ) Iron plate
( Field supply )
( 10 )
( 7 )
Heat
exchanger
( 6 )
K
K
K
Motor pulley
Note
Equivalent to 3 mm
displacement per 1 m
5-3 TENSION OF V BELT
• Tension of a V belt must meet the deflection load (W) as
shown.
Calculate the required deflection length (L) by the equation
(1), its tolerance must be within the range as below.
L= 0.016 × C (mm)
C : Distance between the shafts of the pulley ( mm )
Types of V belt
A type
B type
Note
• It is recommended to check the tension as above after 24-
28 hours of the operation.
When the new belts are used, it is preferable to adjust to
about 1.3 times the maximum value of Deflection load (W).

6. REFRIGERANT PIPING

• For the refrigerant piping of the outdoor unit, refer to the
installation manual attached to the outdoor unit.
• Make sure to use R410A as refrigerant before the
installation work. (Otherwise, the unit can not operate
normally)
• Make sure to insulate the piping on both the liquid side and
the gas side. Otherwise, water leakage may be caused.
Use a heat insulating material sufficiently resistant to
120 °C. Reinforce the refrigerant piping according to the
installation environment. Otherwise, condensation may
form on the surface of the insulation.
( 8 )
( 9 )
CAUTION
This unit is for using R410A only.
Fan
motor
Make sure to follow the items as shown in below when
working.
• Use the pipe cutter and the flaring tool that are
exclusively used for R410A.
• At flare connection, apply ETHER oil or ESTER oil to
the flare section.
• Protect the piping by a pinch or taping to prevent invasion
of contamination, moisture and dusts into the piping.
6-1 MATERIAL OF PIPING
• Use the copper tube according to the following table.
Indoor unit
capacity
125 type
200 type
250 type
400 type
500 type
W
Deflection load
L
(1)
Deflection load W (N)
13.7-20.6
22.6-34.3
Piping size
Piping on gas side Piping on liquid side
φ15.9 × t1.0 mm φ9.5 × t0.8 mm
φ19.1 × t1.0 mm φ9.5 × t0.8 mm
φ22.2 × t1.0 mm φ9.5 × t0.8 mm
φ28.6 × t1.0 mm φ12.7 × t0.8 mm
φ28.6 × t1.0 mm φ15.9 × t1.0 mm
4