Daikin VRV III REYQ10PY1B, Service Manual

Page: 173 / 472

Test Operation SiBE37-701
162 Test Operation
[Shutoff Valve Operation Procedure]
When operating the shutoff valve, follow the procedure instructed below.
Note:
„
Do not open the shutoff valve until “1.2.1 Check work prior to turn power supply on” in page
155 are completed. If the shutoff valve is left open without turning on the power, it may cause
refrigerant to buildup in the compressor, leading insulation degradation.
„
Be sure to use the correct tools.
„
The shutoff valve is not a back-seat type. If forced it to open, it might break the valve body.
„
When using a service port, use the charge hose.
„
After tightening the cap, make sure no refrigerant gas is leaking.
[Tightening torque]
The sizes of the shutoff valves on each model and the tightening torque for each size are listed
in the table below.
<Size of Shutoff Valve>
REYQ8~16PY1B
REYQ18~48P7Y1B
8HP type 10HP type 12HP type 14HP type 16HP type
Liquid pipe shutoff valve
φ
9.5
φ
12.7
The 12HP type corresponds to the 12.7-
diameter onsite piping using the accessory
pipe.
Suction gas shutoff valve
φ
25.4
The 8HP type corresponds to the 19.1-diameter onsite piping using the
accessory pipe.
The 10HP type corresponds to the 22.2-diameter onsite piping using the
accessory pipe.
The 12-16 HP type corresponds to the 28.6-diameter onsite piping using
the accessory pipe.
HP/LP gas shutoff valve
φ
19.1
The 8HP type corresponds to the 15.9-diameter onsite piping using the
accessory pipe.
The 14·16 HP type corresponds to the 22.2-diameter onsite piping using
the accessory pipe.
8HP type 10HP type 12HP type 14HP type 16HP type
Liquid pipe shutoff valve
φ
9.5
φ
12.7
The 12HP type corresponds to the 12.7-
diameter onsite piping using the accessory
pipe.
Suction gas shutoff valve
φ
25.4
The 8 · 10HP type corresponds to the 22.2-diameter onsite piping using
the accessory pipe.
The 12-16 HP type corresponds to the 28.6-diameter onsite piping using
the accessory pipe.
HP/LP gas shutoff valve
φ
19.1
The 14 · 16 HP type corresponds to the 22.2-diameter onsite piping
using the accessory pipe.
Equalizer pipe shutoff
valve
φ
19.1