Toshiba HWS-P804HR-E Instruction Manual page 16

Air to Water Heat Pump
 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.
Half union or packed valve
Externally
threaded side
Fix with 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
9.5 mm (diam.)
15.9 mm (diam.)
Cap
Loosened
15-EN
Flare nut
Internally threaded
side
Tighten with torque wrench.
(Unit: N•m)
Tightening torque
33 to 42 (3.3 to 4.2 kgf•m)
68 to 82 (6.8 to 8.2 kgf•m)
Cover
Piping valve
Tightened
Flare nut
Valve at gas side
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.
NO GOOD
• 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.
Do not apply refrigerating machine oil to the
flared surface.
 Refrigerant pipe length
Refrigeration pipe
H: max. ±30 m (above / below)
L: max. 30 m, min 5 m
30 m chargeless
Outdoor unit
– 15 –
Installation Manual
Cover
Cap
Hydro Unit
30 m chargeless