SINGLE SCREW CHILLERS IMM
24
Engineered for Flexibility and Performance
Coolant (Ethylene glycol, CaCl
2
, etc.) should have a pH between 8 and 9, the reserve
alkalinity should be between 16 to 21.
G) Anti-freezing measures
1. Sufficient thermal insulation and damp proof are requested. If not, it will lead to heat loss or
damage of tubes in cold winter due to freeze.
2. If the ambient temperature is below 0
℃
, heat the water in chiller tubes to prevent freezing.
3. Chiller plant room might equip heater to prevent water freezing in chiller unit.
4. If chiller seasonally stop in the plant room where temperature goes below 0
℃
, operator
must drain the water in chiller tubes. Otherwise Daikin won’t be responsible for the damage
or loss caused by this.
5. Notice the water inlet\outlet indications when connect the chiller to the water system.
H) Starting countermeasures to low cooling inlet-water temperature.
The piping methods listed below is recommended specific to the low cooling inlet-water
temperature condition.
Fig.6-4
As shown in the figure, the two-way motorized valve is installed in the leaving pipe of cooling
water, and the water inflows into the condenser is controlled by high-low pressure difference
through enlarging the opening of the two-way motorized valve while the high-low pressure
difference is greater than a certain value, and narrowing the opening in reverse
circumstance.
6.4 Electric Works
A) Confirm that the wiring is connected.
Confirm that the wiring is connected correctly, and anti-phase or default phase is not allowed.
Please be noted that the port connection position shall not bear any external force during
wiring.
Check the wires to confirm all of them are connected correctly.
Refer to
[
chiller Technology Parameters
]
for wiring specifications.
B) Ground wire connection
To avoid electric shock, the wiring terminal of control cabinet and the grounding bolt on the
chiller base must be grounded.
Wire connection works must be performed by the qualified professionals.
Grounding resistance shall be below 0.1Ω.
