ERHQ011~W1 + ERLQ011~W1
Outdoor unit for air to water heat pump
4PW57794-1 – 08.2010
Installation manual
18
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
additional refrigerant charge for ERLQ models" on page 18
■
In case re-charge is required, refer to
.
12.2. Precautions and general guidelines
■
When servicing the unit requires the refrigerant system to be
opened, treatment and evacuation of refrigerant must be done in
accordance with applicable legislation.
■
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
"11. Leak test and vacuum drying" on
).
■
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.
12.3. Calculating the additional refrigerant charge for
ERHQ models
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
"12.5. Complete recharging" on page 19
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>
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>
12.4. Calculating the additional refrigerant charge for
ERLQ 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 formula below.
R=(total length (m) of liquid piping – 10 m) x 0.054
R=additional charge (kg)(rounded in units of 0.1 kg)
CAUTION
When charging a system, care shall be taken that its
maximum permissible charge is never exceeded, in view of
the danger of liquid hammer.
WARNING
■
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.
■
Charging with an unsuitable substance may cause
explosions and accidents, so always ensure that the
appropriate refrigerant (R410A) is charged.
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.
NOTICE
Piping length is the one way length of liquid piping.
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
"12.5. Complete recharging" on page 19
(b)
(b) Additional charge not required
0.5
1.0
1.5
2.0
Refrigerant piping length
3~10 m
10~20 m
20~30 m
30~40 m
40~50 m
50~60 m
60~75 m
(a)
(a) Additional charge not required
0.5
1
1.5
2
2.5
3.0
NOTICE
Piping length is the one way length of liquid piping.
