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9-8-3. Heat insulation
1. Provide heat insulation on the refrigerant piping on
both the liquid side and gas side separately, and
ensure that all joints in the insulation are completely
sealed (without gap).
2. Since the temperature of the piping on the gas side
increases during heating operations, the heat
insulating material used must be able to withstand
temperatures of more than 120°C.
3. Use the pipe insulation supplied in the accessory
pack to insulate the piping connecting section on
the indoor unit side.
Fig. 9-8-1
<For RAV-SM800AT-E model>
• As shown in the figure, be sure to use a double
spanner to loosen or tighten the flare nut of the
valve at gas side. If using a single spanner, the nut
cannot be tightened with necessary tightening
torque.
SM800 type valve at gas side
Fig. 9-8-2
Gas side (12.7 mm (diam.)) 50 to 62 N•m (5.0 to 6.2 kgf•m)
Liquid side (9.52 mm (diam.)) 33 to 42 N•m (3.3 to 4.2 kgf•m)
Liquid side (6.35 mm (diam.)) 14 to 18 N•m (1.4 to 1.8 kgf•m)
Service port 14 to 18 N•m (1.4 to 1.8 kgf•m)
Flare nut
Cover
Cap
Piping valve
Loosened
Tightened
Cover
Do not put the spanner or
torque wrench, etc. on the
cover.
The valve may be broken.
Hexagonal wrench is required.
9-8-4. Packed valve handling precautions
• Open the valve stem all the way out; do not try to
open it beyond the stopper.
• Securely tighten the valve stem cap in torque as
follows:
Valve unit
Charge port
Push in handle.
Opened fully
Handle
Valve unit
Handle
Pull out the handle and
using cutting pliers, etc.
turn it counterclockwise
by 90°. (Open fully)
Charge port
Flare nut
Flare nut
Fig. 9-8-3
• On the contrary, use a single spanner to loosen or
tighten the flare nut of the valve at liquid side.
Fig. 9-8-4
Fig. 9-8-5
Fig. 9-8-6