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Daikin RWEYQ252PTJU [11/24] Water piping work
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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
Содержание
- Installation manual 1
- Rweyq72ptju rweyq84ptju rweyq144ptju rweyq168ptju rweyq216ptju rweyq252ptju 1
- System air conditioner 1
- Contents 6
- English 6
- Installation manual 6
- Safety considerations 6
- English 2 7
- 1 combination 8
- 2 standard operation limit 8
- 3 standard supplied accessories 8
- 4 option accessory 8
- English 8
- Introduction 8
- 5 technical specifications 9
- 6 electrical specifications 9
- English 4 9
- English 10
- Inspecting and handling the unit 10
- Selection of location 10
- Unpacking and placing the unit 10
- 1 when designing the equipment 11
- 2 before starting a test run 11
- English 6 11
- Handling of the brazed plate type heat exchanger 11
- Water piping work 11
- 3 daily service and maintenance 12
- 4 water quality 12
- 5 maintenance of plate type heat exchanger 12
- After cleaning has been completed make sure that the unit can be operated in a normal fashion 12
- Because the plate type heat exchanger has a structure which does not permit disassembling and cleaning follow the following proce dures for cleaning 12
- Before entering the season for use carry out the following inspections 12
- Circulate this solution for 15 20 minutes for neutral ization purpose 5 after the process of neutralization has been completed rinse the inner part of the plate type heat exchanger with care using fresh and clean water 6 when using any cleaning agent sold in the market check in advance that such agent has no corrosive features against stain less steel and copper 7 for details of cleaning method ask the manufacturer of related cleaning agent 12
- Conduct a water quality test and make sure that it is within the standard 2 clean the strainer 3 make sure that the flow rate is correct 4 make sure that the operational conditions pressure flow rate outlet temperature etc are normal 12
- English 12
- For maintenance purposes it is required to provide for a connec tion port on the water inlet and on the water outlet you must con nect a circulation pump inbetween these 2 connection ports when cleaning the plate heat exchanger with chemicals for cleaning the scale in the plate heat exchanger it is recom mended to use a solution with 5 diluted formic citric oxalic ace tic or phosphoric acid never use hydrochloric sulfuric or nitric acid because such solu tions have a strong corrosive feature 2 make sure to provide for a stopvalve in front of that inlet water pipe connection port and for a stopvalve after the outlet water pipe connection port 3 connect the piping for circulation of cleaning chemicals to the inlet and outlet piping of plate type heat exchanger fill the clean ing solution of 122 144 f for a while in the plate type heat exchanger then circulate the cleaning solution by a pump for 2 5 hours the time for cleaning depends on the temperature of cleaning solution or the degree 12
- Management of chilled water flow rate if the chilled water flow rate is not enough it will result in the freezing damage to the plate type heat exchanger check for any clogging of the strainer any air being caught any reduction in the flow rate due to failure of circulation pump by measuring the temperature and pressure differences at the inlet and outlet ports of the plate type heat exchanger if the aged difference in the temperature or pressure has increased beyond the proper range the flow rate should have decreased stop the operation and remove the cause before restart ing the operation 12
- Management of water quality the plate type heat exchanger has a structure that does not permit dismantling and cleaning or replacing any parts please pay attention carefully to the quality of water to be used for the plate type heat exchanger in order to prevent corrosion and sticking of scale the water to be used for the plate type heat exchanger should have at least the quality as specified in the table below when using any corrosion prevention agent scale depressant agent etc such agent should have no corrosive features against stainless steel and copper 12
- Notes 1 the circle marks in the columns for corrosion or scale to develop 2 corrosion has a tendency to occur when water temperature is high 104 f or more and if metals with no protective coating whatever are directly exposed to water it would be a good idea to take effec tive measures against corrosion such as adding a corrosion inhibitor or deaeration treatment 3 in a condenser water circuit that uses a closed cooling tower the closed circuit circulating water and make up water must satisfy its water quality standards for the hot water system and passing water and make up water must satisfy those for the circulation type cooling water system 4 the supply water must be clean tap water industrial water or clean underground water do not use purified or softened water 5 the fifteen items in the table above represent typical causes of cor rosion and scale 6 once through water may cause corrosion do not use once through water 12
- Steps to be taken when a freezing protection device was activated when the freezing protection device should be activated during operation remove the cause without fail before restarting the opera tion if the freezing protection device has been once activated a par tial freezing has occurred if you restart the operation without removing the cause the plate type heat exchanger will be closed and the ice cannot be melted and in addition the freezing process will be repeated resulting in any damage to the plate type heat exchanger leading to any such accidents that the refrigerant starts leaking or water starts entering the refrigerant circuit 12
- The performance of a plate type heat exchanger may decline due to scale accumulation it may be damaged by freezing due to the drop of flow rate for this reason it is necessary to carry out programmed main tenances at a regular interval in order to prevent the scale from being generated 12
- Water quality standards for chilled water hot water and make up water 4 6 12
- 1 optional parts 13
- 2 power circuit and cable requirements 13
- 3 general 13
- 4 examples 13
- English 8 13
- Field wiring 13
- English 14
- Setting the cool heat operation type 14
- Setting the interlock circuit and pump operation output 14
- 5 in case of a local setting 15
- Connect same thickness wiring to both sides 15
- Cup washer 15
- Cut out section 15
- English 10 15
- It is forbidden to connect two to one side 15
- It is forbidden to connect wiring of different thicknesses 15
- Power wire round pressure terminal 15
- Round pressure terminal 15
- 1 selection of piping material 16
- 2 protection against contamination when install ing pipes 16
- 3 pipe connection 16
- English 16
- Refrigerant piping 16
- 4 connecting the refrigerant piping 17
- English 12 17
- If 80 in or less 17
- If 80 in or more 17
- Pattern 1 17
- Pattern 2 17
- Prohibited pattern 17
- 5 example of connection 18
- Branch with refnet joint branch with refnet joint and refnet header branch with refnet header 18
- English 18
- Example of connection 18
- How to calculate the additional refrigerant to be charged 18
- In case of a system of switching between cooling and heating all systems use 2 tube piping for suction gas piping and liquid piping no bs unit is required 18
- Pipe size selection 18
- Refrigerant branch kit selection 18
- 6 air tight test and vacuum drying 19
- 7 pipe insulation 19
- 8 checking of device and installation conditions 19
- 9 additional refrigerant charge 19
- Charge with the tank upright 19
- Charge with the tank upside down 19
- English 14 19
- There is a siphon tube inside so there is no need to turn the tank upside down 19
- 10 stop valve operation procedure 20
- English 20
- 1 air discharge 21
- 2 before turn on the power supply 21
- 3 check operation 21
- Checks after installation 21
- English 16 21
- Test run 21
- 4 check of normal operation 22
- Caution for refrigerant leaks 22
- English 22
- English 18 23
- P153897 12p em09a022 24
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