Installation and operation manual
20
10T8Y1B
VRV-W IV System Air Conditioner
4P399208-1 – 2015.01
Do not connect the drain outlet to the water outlet.
Install the filter in the inlet of the water piping within a distance of
1.5 m from the outdoor unit.
(If sand, waste or rust particles are mixed in the water circulation
system, metal materials will become corroded.)
Install insulation up to the base of heat exchanger as shown in
the figure below.
Install a gate valve for chemical cleaning in an easy position to
handle.
Use water pipes that comply with the local and national codes.
Run the water pump to flush the water piping after filling it.
Then, clean the filter.
If there is a possibility of freezing, take preventive measures.
Securely tighten the water piping connection with a tightening
torque of 300 N•m or less.
(If a larger torque is applied, the unit may be damaged.)
1
Air purge (field supply)
2
Water outlet
3
Water inlet
4
Gate valve (field supply)
5
Water connection
6
Water piping (field supply)
7
Insulation (field supply)
8
Heat exchanger
9
Filter (accessory)
10
Drain valve (field supply)
11
Drain connection
12
Insulation cover
13
80 mm or less
13. Handling of the brazed plate heat
exchanger
13.1. When designing the equipment
Install the filter at the water inlet side adjacent to the outdoor unit
in order to prevent any foreign materials such as dust, sand, etc.
from entering.
Depending on the water quality, scale may stick to the plate heat
exchanger. In order to remove this scale, it is necessary to clean
it at a regular interval using chemicals. To this end, install a gate
valve in the water piping. Set up a piping connection port on the
piping between this gate valve and the outdoor unit for cleaning
by chemicals.
For the purpose of cleaning and water draining from the outdoor
unit (water draining during a long period of non-use in winter or
at the start of season-off), install an air purge plug (for joint use
with cleaning port) (field supply) and a water draining plug at the
inlet/outlet ports of water piping. In addition, install an automatic
air purge valve (field supply) at the top of rising piping or at the
top of a portion where air tends to stay.
Install an additional cleanable filter (field supply) in front of the
pump inlet.
Carry out complete cooling/thermal insulation of the water piping
and the outdoor unit drain piping. If complete cooling or thermal
insulation has not been carried out, the unit may sustain damage
during severe winters due to freezing, in addition to thermal loss.
When you stop operation during night or winter, it is necessary
to take measures to prevent water related circuits from natural
freezing in areas where the ambient temperature drops below
0°C (by water drain off, keeping the circulation pump running,
warming up by a heater, etc.). Freezing of water related circuits
may result in damage to the plate heat exchanger. Therefore,
please take appropriate measures depending on the
circumstances of use.
1
Example of piping
2
Water inlet piping
3
Filter (accessory)
4
Air purge plug (for joint use with cleaning port) (field
supply)
5
Cleaning device (field supply)
6
Filter for pump (field supply)
7
Automatic air purge valve (field supply)
8
Water outlet piping
9
Joint use with water draining plug
10
Plate heat exchanger
11
Outdoor unit
1
2
4
5
6
7
12
8
9
11
10
3
13
CAUTION
A brazed plate heat exchanger is used for this unit.
Because its structure is different from a conventional heat
exchanger, it must be handled in a different manner.
1
2
8
9
3
4
5
6
7
10
11
