Pump Down Operation - Rotex RRHQ011BAV3 Installationsanleitung

Calculating the additional refrigerant charge
Piping length is the one way length of gas or liquid piping
whichever is the longest.
For V3 models
It is not necessary to charge additionally if the piping length is under
30 m.
However, if the piping length is under 5 m, a complete recharging of
the unit is required. Refer to "Complete recharging" on page 11.
If the piping length is over 30 m please determine the additional
amount of refrigerant to be charged using the table below.
Table 1: Additional charging of refrigerant <unit: kg>
Refrigerant piping length
3~5 m 5~30 m 30~40 m
(a) (b)
0.5
(a) Recharge required, refer to "Complete recharging" on page 11
(b) Additional charge not required
For W1 models
It is not necessary to charge additionally if the piping length is under
10 m.
If the piping length is over 10 m please determine the additional
amount of refrigerant to be charged using the table below.
Table 2: Additional charging of refrigerant <unit: kg>
Refrigerant piping length
3~10 m 10~30 m 30~40 m
(a)
1 1.5
(a) Additional charge not required
Complete recharging
Before recharging, make sure to execute vacuum drying of
the internal piping of the unit as well. To do so, use the
internal service port of the unit. Do NOT use the service
ports located on the stop valve (see "Stop valve operation"
on page 7), since vacuum drying can not be performed
properly from these ports.
Outdoor units have 1 port on the piping. It is between the
heat exchanger and the 4-way valve.
In case complete recharging is required (after a leak, etc.), refer to
the table below to determine the necessary amount of refrigerant.
Table 3: Total charging amount <unit: kg>
Refrigerant piping length
3~10 m 10~20 m 20~30 m 30~40 m 40~50 m
V3 2.7 3.2 3.7
W1 2.95 3.45 3.95
RRHQ0011~016BAV3 + RRLQ011~016BAV3+W1
Outdoor unit for air to water heat pump
4PW54248-1
40~50 m 50~60 m 60~75 m
1.0 1.5 2.0
40~50 m 50~60 m 60~75 m
2 2.5 3.0
50~60 m 60~75 m
4.2 4.7 5.2 5.7
4.45 4.95 5.45 5.95
P
UMP 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.
For more details, refer to the applicable service
NOTE
manual.
WARNING
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!
1. Turn on the main power supply switch.
2. Make sure the liquid stop valve and the gas stop valve are open
(see "Stop valve operation" on page 7).
3. Press the pump down button (BS4) on the PCB of the outdoor
unit for at least 8 seconds.
4. The compressor and outdoor unit fan will start operating
automatically.
5. Once operation stops (after 3 to 5 minutes), close the liquid stop
valve and the gas stop valve.
6. The pump down operation is now finished. The remote controller
may display " U4 " and the indoor pump may continue operating
for about 30 seconds. This is not a malfunction. Even when the
ON button on the remote controller is pressed, the unit will not
start to operate. To restart operation of the unit turn off the main
power supply switch and turn it on again.
7. Turn off the main power supply switch.
WARNING
Make sure to re-open both stop valves before restarting
operation of the unit.
Installation manual
11