ERHQ011~W1 + ERLQ011~W1
Outdoor unit for air to water heat pump
4PW57794-1 – 08.2010
Installation manual
16
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When passing electrical wiring through the knockout holes,
remove any burrs from the knockout holes and wrap the wiring
with protective tape to prevent damage.
10.1. Preventing foreign objects from entering
Plug the pipe through-holes with putty or insulating material
(procured locally) to stop up all gaps, as shown in the figure.
If there is any possibility that small animals enter the system through
the knockout holes, plug the holes with packing materials (field
supplied).
Insects or small animals entering the outdoor unit may cause a short
circuit in the electrical box.
In cold climates, seal knockout holes to avoid enterance of snow and
humidity.
10.2. Precautions when connecting field piping and
regarding insulation
■
Be careful not to let the indoor and outdoor piping come into
contact with the compressor terminal cover.
If the liquid-side piping insulation might come into contact with it,
adjust the height as shown in the figure below. Also, make sure
the field piping does not touch the bolts or outer panels of the
compressor.
■
When the outdoor unit is installed above the indoor unit the
following can occur:
The condensated water on the stop valve can move to the
indoor unit. To avoid this, please cover the stop valve with
sealing material.
■
If the temperature is higher than 30°C and the humidity is higher
than RH 80%, then the thickness of the sealing materials should
be at least 20 mm in order to avoid condensation on the surface
of the sealing.
■
Be sure to insulate the liquid and gas-side field piping.
(The highest temperature that the gas-side piping can reach is
around 120°C, so be sure to use insulating material which is
very resistant.)
10.3. Cautions for necessity of a trap
To avoid the risk of oil held inside the riser piping flowing back into the
compressor when stopped and causing liquid compression
phenomenon, or cases of deterioration of oil return, it will be
necessary to provide a trap at each difference in height of 10 m in the
riser gas piping.
■
Trap installation spacing.
■
A trap is not necessary when the outdoor unit is installed at
higher position than the indoor unit.
1
Knockout hole
2
Burr
3
Packing materials
NOTICE
Any exposed piping may cause condensation.
DANGER
Do not touch piping and internal parts.
2
3
1
1
1
Putty or insulating material
(produced locally)
1
Compressor
2
Terminal cover
3
Indoor and outdoor field piping
4
Corking, etc.
5
Insulation material
6
Bolts
A
Be careful with pipe, bolt and outer panel connections
A
Outdoor unit
B
Indoor unit
C
Gas piping
D
Liquid piping
E
Oiltrap
H
Install trap at each difference in height of 10 m.
2
1
3
5
5
A
4
4
6
