– 16 –
Air to Water Heat Pump
Installation Manual
Tightening of connecting part
1. Align the centers of the connecting pipes and fully
tighten the flare nut with your fingers. Then fix the
nut with a wrench as shown in the figure and tighten
it with a torque wrench.
2. As shown in the figure, be sure to use two wrenches
to loosen or tighten the flare nut of the valve on the
gas side. If you use a single crescent, the flare nut
cannot be tightened to the required tightening
torque.
On the other hand, use a single crescent to loosen
or tighten the flare nut of the valve on the liquid side.
(Unit: N•m)
CAUTION
1. Do not put the crescent wrench on the cap or
cover.
The valve may break.
2. If applying excessive torque, the nut may break
according to some installation conditions.
• After the installation work, be sure to check for gas
leaks of the pipe connections with nitrogen.
• Pressure of R410A is higher than that of R22
(Approx. 1.6 times).
Therefore, using a torque wrench, tighten the flare
pipe connecting sections that connect the indoor /
outdoor units at the specified tightening torque.
Incomplete connections may cause not only a gas
leak, but also trouble with the refrigeration cycle.
Refrigerant pipe length
Refrigeration pipe
H: max. ±30 m (above / below)
L: max. 30 m, min 5 m
30 m chargeless
Outer dia. of copper pipe
Tightening torque
9.5 mm (diam.)
33 to 42 (3.3 to 4.2 kgf•m)
15.9 mm (diam.)
68 to 82 (6.8 to 8.2 kgf•m)
Half union or packed valve
Flare nut
Externally
threaded side
Internally threaded
side
Fix with wrench.
Tighten with torque wrench.
Cover
Piping valve
Tightened
Flare nut
Cap
Loosened
Valve at gas side
Do not apply refrigerating machine oil to the
flared surface.
NO GOOD
Cover
Cap
H
L
Hydro Unit
Outdoor unit
30 m chargeless
16-EN
Summary of Contents for HWS-1105H-E
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