Preventing Foreign Objects From Entering; Cautions For Handling Stop Valve; How To Use The Stop Valve; Cautions For Handling The Valve Cover - Daikin ERQ100A7V1B Installation Manual

For ERQ140 only
The size of the gas side stop valve is Ø15.9 while the inter-unit piping
is Ø19.1. Use the standard supplied accessory piping to make the
connection. See figure 14.
A Front connection
B Rear connection
C Side connection
D Bottom connection
1 Gas line piping + copper gasket supplied with the unit (make sure
to always use the copper gasket).
2 Gas line piping supplied with the unit
3 Gas piping (field supply)
4 Cut to the appropriate length.
5 Gas line piping supplied with the unit

9.1. Preventing foreign objects from entering

Plug the pipe through-holes with putty or insulating material (field
supply) to stop up all gaps, as shown in the figure.
1
Insects or small animals entering the outdoor unit may cause a short
circuit in the electrical box.

9.2. Cautions for handling stop valve

The stop valves for air handling unit-outdoor connecting piping
are closed at shipment from the factory.
Make sure to keep the valve open during operation.
The names of parts of the stop valve are shown in the figure.
1
2
3
4
Since the side boards may be deformed if only a torque wrench
is used when loosening or tightening flare nuts, always lock the
stop valve with a wrench and then use a torque wrench.
Do not place wrenches on the valve cover.
1 Spanner
2 Torque wrench
Do not apply force on the valve cover, this may result in a
refrigerant leak.
ERQ100~140A7V1B
Inverter condensing unit
4PW51321-1
1 Putty or insulating material (field
supply)
1 Service port
2 Stop valve
3 Field piping connection
4 Valve cover
1
2
For cooling operation under low ambient temperature or any
other operation under low pressure, apply silicon pad or similar
to prevent freezing of the gas stop valve flare nut (see figure).
Freezing of the flare nut may cause refrigerant leak.

9.3. How to use the stop valve

Use hexagonal wrenches 4 mm and 6 mm.
Opening the valve
1. Place the hex wrench on the valve bar and turn counter-
clockwise.
2. Stop when the valve bar no longer turns. It is now open.
Closing the valve
1. Place the hex wrench on the valve bar and turn clockwise.
2. Stop when the valve bar no longer turns. It is now closed.
Closing direction
Liquid side

9.4. Cautions for handling the valve cover

The valve cover is sealed where
indicated by the arrow.
Take care not to damage it.
After operating the valve, be sure to tighten the valve cover
properly.
Liquid pipe
Gas pipe
Check for refrigerant leakage after tightening the cap.

9.5. Cautions for handling service port

After the work, tighten the valve cover in place.
Tightening torque: 11.5~13.9 N•m
Silicon sealing pad
(Make sure there is no gap)
Gas side
Tightening torque
13.5~16.5 N•m
22.5~27.5 N•m
Installation manual
8