Refrigerant Piping Work - Daikin VAM-FA8VE Technical Data Manual

• HRV • VKM-GA(M)V1
[PRECAUTIONS]
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Use pure water (city water, tap water or equivalent) that satisfies the standard regulated by the law of
each country for water supply to the humidifier when performing anti-sweat work.
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Dirty water may cause valves to clog, dirt to accumulate in water tanks, and resulting in poor humidifier
performance. (Never use water from a cooling tower or warm water for heating.)
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Make sure the supply water is between 5°C and 40°C in temperature and 0.02MPa to 0.49MPa (0.2kg/cm
to 5kg/cm
water pressure will be higher than this range.
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Use city water or clean water and take steps to prevent condensation from forming.
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Also, if the supply water is hard water, use a water softener because of short life.
∗ Life of humidifying element is about 3 years (4,000 hours), under the supply water conditions of
(5) Insulate all piping that passes indoors.
After checking that the water supply piping connections do no leak, insulate them using the included
insulation as shown in Fig. 10. (Tighten both edges with clamping material.) (Refer to Fig. 10)
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9.6

Refrigerant Piping Work

〈For refrigerant piping of outdoor units, see the installation manual attached to the outdoor unit.〉
〈Execute heat insulation work completely on both sides of the gas piping and the liquid piping.
Otherwise, a water leakage can result sometimes.
Use insulation that can withstand temperatures of at least 120°C. Improve insulation of refrigerant
piping according to the installation environment.
Refer to the following information as a guide.
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The ambient temperature is 30°C and humidity is 75% to 80%: 15 mm min. in thickness.
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The ambient temperature exceeds 30°C and the humidity exceeds 80%: 20 mm min. in thickness.
Without reinforcement, condensation may form on the surface of the insulation.〉
〈Before refrigerant piping work, check the type of R-410A refrigerant is used. (Proper operation is
not possible if the types of refrigerant are not the same.)〉
This product must use a new refrigerant (R-410A). Obey the following items.
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The outdoor unit is charged with refrigerant.
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Be sure to use both a spanner and torque wrench together, as shown in the drawing, when connecting or
disconnecting pipes to the unit. (Refer to Fig. 11)
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Refer to the "Table 1" for the dimensions of flare nut spaces.
Table 1
Pipe gauge
• HRV • Heat Reclaim Ventilation
2
) in pressure. Include a pressure release valve between the humidifier and the strainer if the
hardness: 150mg/l. (Life of humidifying element is about 1 year (1,500 hours), under the supply water
conditions of hardness: 400mg/l.)
Annual operating hours: 10 hours / day × 26 days / month × 5 month = 1,300 hours
Insulation
(for water supply piping)
(accessory)
Wrap the water supply piping with insulation to prevent condensation from forming.
In areas where freezing may occur, always take steps to prevent the pipes from freezing.
CAUTION
Use a pipe cutter and flare suitable for the type of refrigerant (R-410A).
Apply ester oil or ether oil around the flare portions before connectioning.
Only use the flare nuts included with the unit. Using different flare nuts may cause the
refrigerant to leak.
To prevent dust, moisture or other foreign matter from infiltrating the tube, either pinch the
end or cover it with tape.
Do not allow anything other than the designated refrigerant to get mixed into the refrigerant
circuit, such as air, etc. If any refrigerant gas leaks while working on the unit, ventilate the
room thoroughly right away.
Tightening torque
φ 6.4
14.2–17.2N·m
φ12.7
49.5–60.3N·m
Clamp
(accessory)
Fig. 10
Flare dimension A (mm)
8.7 – 9.1
16.2 – 16.6
Flare shape
R0.4-0.8
2
2
9
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