Precautions When Adding R410A; Stop Valve Operation Procedure; Additional Refrigerant Charge - Daikin ERQ200A7W1B Installation Manual

CAUTION
In Europe, the Greenhouse gas emissions of the total
refrigerant charge in the system (expressed as tonnes CO
equivalent) is used to determine the maintenance intervals.
Follow the applicable legislation.
Formula to calculate the greenhouse gas emissions:
GWP value of the refrigerant × Total refrigerant charge [in
kg]/1000
11.2.

Precautions when adding R410A

Be sure to charge the specified amount of refrigerant in liquid state to
the liquid pipe.
Since this refrigerant is a mixed refrigerant, adding it in gas form may
cause the refrigerant composition to change, preventing normal
operation.
 Before charging, check whether the refrigerant cylinder is
equipped with a siphon tube or not.
Charge the liquid
refrigerant with the
cylinder in upright
position.
 Be sure to use tools exclusively for R410A to ensure required
pressure resistance and to prevent foreign materials from mixing
into the system.
Charging with an unsuitable substance may cause
explosions and accidents, so always make sure that the
appropriate refrigerant (R410A) is charged.
Refrigerant containers must be opened slowly.
11.3.

Stop valve operation procedure

 Do not open the stop valve until all piping and
electrical steps
installation conditions" on page 12
the stop valve is left open without turning on the
power, it may cause refrigerant to build up in the
compressor, leading to insulation degradation.
Always use a charge hose for service port connection.

 After tightening the cap, check that no refrigerant
leaks are present.
Size of stop valve
The sizes of the stop valves connected to the system are as listed in
the table below.
Liquid line stop valve
Gas line stop valve
(a) The model ERQ250 supports field piping of Ø22.2 on the accessory pipe
supplied with the unit.
Opening stop valve (See figure 23)
1 Service port
2 Cap
3 Hexagon hole
4 Shaft
5 Seal
1. Remove the cap and turn the valve counterclockwise with the
hexagon wrench.
2. Turn it until the shaft stops.
Do not apply excessive force to the stop valve. Doing
so may break the valve body, as the valve is not a
backseat type. Always use the special tool.
ERQ125~250A7W1B
Inverter condensing unit
4PW51323-1D – 2022.10
Charge the liquid
refrigerant with the
cylinder in up-side-down
position.
of "10. Checking of unit
are completed. If
ERQ125 ERQ200 ERQ250
Ø9.5
Ø15.9 Ø19.1
Ø25.4
3. Make sure to tighten the cap securely. Refer to the table below
2
Stop valve size Valve body
Ø9.5
Ø15.9 13.5~16.5
Ø19.1
27.0~33.0
Ø25.4
Closing stop valve
1. Remove the cap and turn the valve clockwise with the hexagon
wrench.
2. Securely tighten the valve until the shaft contacts the main body
seal.
3. Make sure to tighten the cap securely.
For the tightening torque, refer to the table above.
11.4.

Additional refrigerant charge

The refrigerant leak detection function can not be used.
Follow the procedures below.
 When charging a system, charging over the
permissible quantity can cause liquid hammer.
 Always use protective gloves and protect your eyes
when charging refrigerant.
 When the refrigerant charging procedure is done or
when pausing, close the valve of the refrigerant tank
immediately. If the tank is left with the valve open, the
amount of refrigerant which is properly charged may
get off point. More refrigerant may be charged by any
remaining pressure after the unit has stopped.
and
Electric shock warning
Close the electric box lid before turning on the main

power.
 Perform the settings on the circuit board (A1P) of the
outdoor unit and check the LED display after the
power is on via the service lid which is in the lid of the
electric box.
Operate switches with an insulated
stick (such as a ball-point pen) to
avoid touching the life parts.
Make
inspection cover into the switch box cover after the job
is finished.
 Make sure to turn ON the power 6 hours before
(a)
starting the operation. This is necessary to warm the
crankcase by the electric heater.
 If operation is performed within 12 minutes after the air
handling unit and outdoor units are turned on, the
H2P-LED will be lit and the compressor will not
operate.
Tightening torque N•m (Turn clockwise to close)
Shaft
Hexagonal
wrench Cap (valve lid)
5.4~6.6 4 mm 13.5~16.5
6 mm 23.0~27.0
8 mm 22.5~27.5
(See figure 23)
sure to re-attach the
Service port
11.5~13.9
Installation manual
13