English
6
NOTE
•
Prepare a water drainage channel around the foundation to con-
densate waste water from around the unit.
•
If the unit is to be installed on a roof, check the strength of the roof
and its drainage facilities first.
•
Make sure the area around the machine drains properly by setting up
drainage grooves around the foundation.
(Condensate water is sometimes discharged from the outside unit
when it is running.)
•
Use a nut with a resin clip plate to protect the nut tightening part from
rusting.
6.
WATER PIPING WORK
• The water pressure resistance of water piping of this outside unit is
285 psi.
• The connection port for water piping is located in the front. The con-
nection ports for drain piping are located in the front and back. When
using the back port, change the cast iron plug from the back to the
front and securely close it.
• Because of indoor use, carry out piping work in such a way no water
may drop on the outer plate.
• Drain piping should be short and have a slant downwards.
The diameter of drain pipe should be the same as the diameter of
unit connection (1/2) or more.
• The diameter of water pipe should be the same as the diameter of
unit connection (1-1/4) or more.
• Install an air purge valve in the midway of the water piping to prevent
cavitation.
• After completing the drain piping work, make sure that the water runs
smoothly without any clogging by dust.
• Do not connect the drain outlet to the water outlet.
• Install the strainer (accessory) in the inlet of water piping within a dis-
tance of 4.9 ft from the outside unit.
(If sand, waste or rust particles are mixed in the water circulation
system, metal materials will become corrosive.)
• Install insulation on the inlet/outlet of water piping to prevent conden-
sation and freezing.
At installing insulation on water in/outlet pipe, use Polyurethane form
thickness 3/16 in. for insulation of water piping socket on heat
exchanger.
• Install insulation up to the base of heat exchanger as shown in the
figure 6.
• Install a gate valve for chemical cleaning in an easy position to han-
dle.
• Use water pipes complied with the local and national codes.
• Run the water pump to flush inside of water piping.
Then, clean the strainer.
• If there is a possibility of freezing, take measures to prevent freezing.
• Tighten securely the connection of water piping and socket with
tightening torque of 220 lbf·ft or less.
(If a large torque is applied, the unit may be damaged.)
(Refer to figure 6)
1.
Air parge
2.
Outlet of water
3.
Inlet of water
4.
Gate valve
5.
Water piping socket
6.
Water piping
7.
Insulation
8.
Heat exchanger
9.
Strainer (accessory)
10.
Drain valve
11.
Connection port to draining piping
12.
Insulation cover
13.
3-1/8 in. or less
14.
Insulation of water piping socket
7.
HANDLING OF THE BRAZED PLATE
TYPE HEAT EXCHANGER
CAUTION
A brazed plate type heat exchanger is used for this unit. Because
its structure is different from a conventional type heat exchanger, it
must be handled in a different manner.
7-1 When designing the equipment
1.
Install the strainer (accessory) at the water inlet side adjacent to the
outside unit in order to prevent any foreign materials such as dust,
sand, etc. from entering.
2.
Depending on the water quality, scale may stick to the plate type 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 outside unit for cleaning by chemi-
cals.
3.
For the purpose of cleaning and water drain off from the outside unit
(water draining during a long period of non-use in winter, draining
upon starting of season-off), install an “air discharge plug” and a
“water draining plug” at the inlet/outlet ports of water piping. In addi-
tion, install an “automatic air discharging valve” at the top of riser pip-
ing or at the top of a portion where air tends to stay.
4.
Independent of the piping inlet of the outside unit, install a cleanable
strainer at a portion close to the pump piping inlet.
5.
Carry out complete cooling/thermal insulation of water piping and
outdoor dehumidification. If complete cooling or thermal insulation
has not been carried out, any damage may be caused during severe
winter due to freezing, in addition to thermal loss.
6.
When you stop operation during night or winter, it is necessary to take
measures to prevent water related circuits from natural freezing in the
area the ambient temperature drops below 32°F (by water drain off,
keeping the circulation pump running, warming up by a heater, etc.)
Freezing of water related circuits may result in any damage to the
plate type heat exchanger. Therefore, please take appropriate mea-
sures depending on the circumstances of use.
(Refer to figure 7)
1.
Example of piping
2.
Water inlet piping
3.
Strainer (accessory)
4.
Air discharge plug (for joint use with cleaning port)
5.
Cleaning device
6.
Strainer for pump
7.
Automatic air discharge valve
8.
Water outlet piping
9.
Joint use with water draining plug
10.
Plate type heat exchanger
11.
Outside unit
7-2 Before starting a test run
1.
Before starting a test run, please make sure that the piping work has
been carried out in a proper manner. Especially, make sure that the
strainer, air discharge valve, automatic water supply valve, expansion
tank and cistern are positioned at their places correctly.
2.
After water has been completely filled in, first run the pump only, and
then make sure that no air has been caught in the water circulation
system and the water flow rate is correct. If any air has been caught
or the flow rate is not enough, the plate type heat exchanger may
freeze. Measure any water pressure loss before and after the out-
side unit and make sure that the flow rate is as designed. In case of
any abnormal, stop the test run immediately and carry out trouble
shooting to resolve the trouble.
3.
Following the installation manual, carry out a test run of the outside
unit.
4.
After the test run has been completed, inspect the strainer at the inlet
piping of the outside unit. Clean it if it is dirty.
Resin clip plate
