Installation and operation manual
36
EWWD440~850AAYNNO**
Packaged water-cooled water chillers
4PW25558-1B
Minimum holding water quantity within the system
For preventing frequent running and stopping of the unit, the chilled
water system shall have at least the capacity of the minimum holding
water capacity.
For further information, see
Table 2: Minimum water volume on
Standards for use
Use this product complying with following items.
Refer to engineering related documents or data already issued for
items not listed above.
■
Use of demineralized water is not allowed
As demineralized water does not contain corrosive factors such
as chloride ion and sulfide ion, it does not contain harness
elements for formation of protective film that is contained in
normal water.
Demineralized water does not have a pH buffering ability. Its
liquidity is affected significantly by factors that come from
outside (e.g., carbonate gas and oxygen in open systems).
H
OW
TO
CONTINUE
Fill out the brief operation instructions form and fix it visibly near the
operating site of the refrigeration system.
N
OTES
Item
Details
Power supply voltage
Within ±10% of rated voltage
Phase imbalance
Within ±2% of rated voltage
Power frequency
Chilled water and condenser
water outlet temperature limit
In conformity with operating limit (See
)
Pull down time
Within 1 hour (at no load)
Start/stop interval of compressor
Compressor shall not start more than 6
times an hour.
Start-to-start interval shall be 10 minutes
or more.
Stop-to-start interval shall be 3 minutes
or more.
Water quality
No soluble matters deteriorating copper
nor carbon steel shall be included.
See
"Water quality specifications" on
.
Condenser cleaning
This action should be carried out when
needed.
Water flow rate
In conformity with
.
Water pressure
1.0 MPa maximum
(both chilled water and condenser water)
Installation location
Indoors
(Ensure that no water drop splashes.)
Water drainage
Provide a drainage ditch around the
foundation.