Installation manual
10
ERLQ036~054BAVJU
Outdoor unit for air to water heat pump
4PW55905-1
C
HARGING
REFRIGERANT
To avoid compressor breakdown. Do not charge the refrigerant
more than the specified amount.
■
This outdoor unit is factory charged with refrigerant and
depending on pipe sizes and pipe lengths some systems require
additional charging of refrigerant. See "Calculating the additional
refrigerant charge" on page 10.
■
In case re-charge is required, refer to "Complete recharging" on
page 10.
Precautions and general guidelines
■
This unit requires additional charging of refrigerant according to
the length of refrigerant piping connected at the site.
■
Make sure to charge the refrigerant in liquid state to the liquid
pipe. Since R410A is a mixed refrigerant, its composition
changes if charged in its gaseous state and normal system
operation would then no longer be assured.
■
Before charging, check whether the refrigerant cylinder has a
syphon attached or not and position the cylinder accordingly.
Calculating the additional refrigerant charge
It is not necessary to charge additionally if the piping length is under
98.43 ft (30 m).
However, if the piping length is under 16.40 ft (5 m), a complete
recharging of the unit is required. Refer to "Complete recharging" on
page 10.
If the piping length is over 98.43 ft (30 m) please determine the
additional amount of refrigerant to be charged using table 1 or table 2
in function of unit of measurements.
Table 1: Additional charging of refrigerant <unit: lbs>
Table 2: Additional charging of refrigerant <unit: kg>
Complete recharging
In case complete recharging is required (after a leak, etc.), refer to
table 3 or table 4 in function of unit of measurement to determine the
necessary amount of refrigerant.
Table 3: Total charging amount <unit: lbs>
Table 4: Total charging amount <unit: kg>
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.
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.
■
When servicing the unit requires the refrigerant
system to be opened, treatment and evacuation of
refrigerant must be done in accordance with relevant
local laws and national regulations.
■
Refrigerant can not be charged until field wiring has
been completed.
■
Refrigerant may only be charged after performing the
leak test and vacuum drying (see "Leak test and
vacuum drying" on page 9).
■
When charging a system, care shall be taken that its
maximum permissible charge is never exceeded, in
view of the danger of liquid hammer.
■
Charging with an unsuitable substance may cause
explosions and accidents, so always ensure that the
appropriate refrigerant (R410A) is charged.
■
Refrigerant cylinders shall be opened slowly.
■
Always use protective gloves and protect your eyes
when charging refrigerant.
DANGER
When the power is on, please close the front panel when
leaving the unit unattended.
Filling using a cylinder
with a siphon attached
Charge the liquid refrigerant
with the cylinder in upright
position.
Filling using a cylinder
without a siphon attached
Charge the liquid refrigerant
with the cylinder in up-side-
down position.
Piping length is the one way length of gas or liquid piping
whichever is the longest.
Refrigerant piping length
9.84~16.40 ft
16.40~98.43 ft
98.43~131.23 ft
(a)
(a) Recharge required, refer to "Complete recharging" on page 10
(b)
(b) Additional charge not required
1.10
131.23~164.04 ft
164.04~196.85 ft
196.85~246.06 ft
2.20
3.31
4.41
Refrigerant piping length
3~5 m
5~30 m
30~40 m
40~50 m
50~60 m
60~75 m
(a)
(a) Recharge required, refer to "Complete recharging" on page 10
(b)
(b) Additional charge not required
0.5
1.0
1.5
2.0
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.
Refrigerant piping length (ft)
9.84~32.81 ft
32.81~65.62 ft
65.62~98.43 ft
98.43~131.23 ft
5.95
7.05
8.16
9.26
131.23~164.04 ft
164.04~196.85 ft
196.85~246.06 ft
10.36
11.46
12.57
Refrigerant piping length
3~10 m
10~20 m
20~30 m
30~40 m
40~50 m
50~60 m
60~75 m
2.7
3.2
3.7
4.2
4.7
5.2
5.7
NOTE
For more details, refer to the applicable service
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!
1D_IM_4PW55905-1.book Page 10 Wednesday, September 9, 2009 10:09 AM
