Toshiba HWT-401HW-E Installation Manual page 12

Outdoor Unit
CAUTION
• Do not scratch the inner surface of the flared part
when removing burrs.
• Flare processing under the condition of scratches on
the inner surface of flare processing part will cause
refrigerant gas leak.
• Check that the flared part is not scratched, deformed,
stepped, or flattened, and that there are no chips
adhered or other problems, after flare processing.
• Do not apply refrigerating machine oil to the flare
surface.
■
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.
Outer dia. of copper pipe Tightening torque
6.4 mm 14 to 18
12.7 mm 50 to 62
15.9 mm 68 to 82
<HWT-80, 110>
Valve at gas side
Flare nut
Tightened
Loosened
21-EN
<HWT-40, 60>
Wrench for
fixing
Cap
Tightened
Valve at gas side
(Unit: N•m)
– 11 –
CAUTION
Flare nut
• Do not put the crescent wrench on the cap.
The valve may break.
• If applying excessive torque, the nut may break
Wrench for work
according to some installation conditions.
Loosened
Incorrect
Incorrect
• After the installation work, be sure to check for gas
leaks of the pipe connections with nitrogen.
Therefore, using a torque wrench, tighten the flare
pipe connecting sections that connect the hydro/
Outdoor Units at the specified tightening torque.
Incomplete connections may cause not only a gas
leak, but also trouble with the refrigeration cycle.
Do not apply refrigerant machine oil to the flared
surface.
■
Refrigerant pipe length
Refrigeration pipe
H: max. ±30 m (above / below)
L: max. 30 m, min 5 m
Charge port
Outdoor Unit
Cap
Use of single wrench is
prohibited
Installation Manual
Hydro Unit
22-EN