ERSQ+ERRQ011~Y1
Outdoor unit for air to water heat pump
4PW49635-1C
Installation manual
18
Setting the mode
1
Push the
button to set the required function
(refrigerant recovery operation/vacuuming operation) to
(ON).
The H3P, H5P and H7P LEDs are on.
2
When the
button is pushed, the LEDs are
indicating the current setting.
3
To set this function
(ON) or
(OFF), push the
button as shown below.
4
Push the
button and the setting is defined.
5
When the
button is pushed again, the operation
starts according to the setting.
Vacuuming method
At the first installation, this vacuuming is not required. It is required
only for repair purposes.
1
When the unit is at a standstill and under the setting mode 2, set
the required function (refrigerant recovery operation/vacuuming
operation) to
(ON).
-
After this is set, do not reset the setting mode 2 until the
vacuuming is finished.
-
The H1P led is on and the remote controller indicates
(test operation) and
(external control) and the
operation will be prohibited.
2
Vacuum the system with a vacuum pump.
3
Press the
button and reset the setting mode 2.
Refrigerant recovery operation method by a refrigerant
reclaimer.
1
When the unit is at a standstill and in setting mode 2, set the
required function (refrigerant recovery operation/vacuuming
operation) to
(ON).
-
The indoor unit and the outdoor unit expansion valves will
fully open and some solenoid valves will open.
-
The H1P led is on and the remote controller indicates
(test operation) and
(external control) and the
operation will be prohibited.
2
Recover the refrigerant using a refrigerant reclaimer. For details,
see the operation manual delivered with the refrigerant
reclaimer.
3
Press the
button and reset the setting mode 2.
Pump down operation
This unit is equipped with an automatic pump down operation which
will collect all refrigerant from the field piping and indoor unit in the
outdoor unit. To protect the environment, make sure to perform the
following pump down operation when relocating or disposing of the
unit.
1.
Turn on the main power supply.
2.
Make sure the liquid stop valve is closed and the gas stop valve
is open (see
Guidelines for handling stop valve" on
).
3.
Switch the service mode 2-61 from OFF to ON.
4.
The compressor and outdoor unit fan will start operating
automatically.
During operation, the LEDs are showing the progress as shown
in the figure.
5.
If step 5 is reached (pressure drops below 3 bar) or if operation
stops (after 30 minutes), close the gas stop valve.
6.
Turn off the main power supply.
H1P
H2P
H3P
H4P
H5P
H6P
H7P
w x w x w x w
H1P
H2P
H3P
H4P
H5P
H6P
H7P
w x
x
x
x c x
(a)
(a) This setting = factory setting
w x
x
x
x
x c
CAUTION
Never turn the power of the outdoor unit OFF while the
refrigerant is being recovered.
If the power is turned OFF, the solenoid valves are closed
and the refrigerant cannot be recovered from the outdoor
unit.
BS2 SET
ON
BS3 RETURN
ON
OFF
BS2 SET
ON
OFF
BS3 RETURN
BS3 RETURN
ON
BS1 MODE
ON
BS1 MODE
■
The outdoor unit is equipped with a low pressure
switch or a low pressure sensor to protect the
compressor by switching it off. Never short-circuit the
low pressure switch during pump down operation!
■
Do not execute the pump down operation if the piping
length between the outdoor unit and the indoor unit is
longer than 10 m. This may cause damage to the unit.
H1P
H2P
H3P
H4P
H5P
H6P
H7P
Step 1
x c w w w w w
Step 2
x c x w w w w
Step 3
x c x
x w w w
Step 4
x c x
x
x w w
Step 5
x c x
x
x
x w
Make sure to re-open both stop valves before restarting
operation of the unit.
