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the water system, the total water outlet temperature sensor of the water system must be installed after the
installation of the auxiliary electrical heating.
The minimum flow of the unit shall not be less than 70% of the rated flow of the unit at any time, and its
maximum flow shall not exceed 130% of the rated flow of the unit at any time.
For the pipe diameter and water resistance of the total water pipe, please refer to the "Design Manual of the
Heating Ventilation Air Conditioning System".
The minimum pressure at the pump inlet shall reach 20kPa, thus avoiding cavitation noise and damage to the
water pump caused by cavitation.
For the electric three-way valve of chilled water and cooling water of the system, it is required that the
actuation time of the three-way valve shall not exceed 1 minute, and they can be connected to the main board
DO8 and DO9 of the master unit (1# module), respectively. The system's cooling tower fan and water pump
can be connected to the master unit's (1# module) main board DO10.
!
Caution:
The built-in water pump unit is designed according to the constant flow system. Attention shall be paid
to the number of two-way valves when installing two-way valves at the end. It is suggested that the number of
two-way valves shall not exceed 1/3 of the number of terminals, and the rest shall be replaced by three-way valves.
If 1/3 is exceeded, the differential pressure bypass valve shall be added.
The dregs and dirt in the conduit network will degrade the heat exchange performance of the heat
exchanger and, in serious cases, will damage the heat exchanger and the water pipe.
The installer/user must ensure the quality of chilled water (see "Water Treatment") and air must not be
allowed to enter the water system.
The waterway's by-pass pipe and the by-pass valve must be installed so as to conduct flushing for the
waterway before the commissioning for the unit; After the pollution discharge is qualified (visual inspection: the
color and transparency of the water at the discharge port are close to that at the water inlet without visible
sundries), conduct trial operation circularly for more than 2 hours. After the water quality is normal, the water can
be connected to the refrigerating unit and air-conditioning equipment.
If the quality of the water which enters the unit cannot meet the requirements of Article 2.11, an
intermediate heat exchanger must be arranged between the unit and the user's water side, in order to ensure that the
heat exchanger of the unit will not be fouled and dirtied due to the water quality, which may result in the
performance degradation and unit's serious damage.
At the lowest point of unit's water pipe, a drain valve should be installed. When the ambient temperature
is relatively low and if the unit will not be used for a long period of time, and when the water temperature is likely
to be lower than 0°C, it is necessary to drain off the water inside
the unit (the bottom of the water chamber located at the unit's
condenser shall be installed with a drain valve, and this water
valve must be opened when the water is discharged, in order to
drain off the residual water at the bottom end of the condenser). If
the water freezes, it will cause the breakdown of the unit's heat
exchanger.
If the electric water valve is required to be installed on
the water inlet and outlet pipe of each module, it is necessary to
ensure that the electric water valve will not be installed in each
module from module 1-2, in order to avoid the disconnection of
the waterway after all the modules are shut down, which may
cause damage to the water pump, and in the meantime, to avoid
the condition that the waterway cannot operate properly due to the inability to correctly judge the water
temperature of the system on account of that the waterway is disconnected with the unit.
In order to ensure that the water flow of each module is balanced, the water flow regulating valve must
be installed on the cooling water/chilled water side, and the opening degree of the water flow regulating valve
shall be adjusted during the commissioning of the unit, in order to make the temperature difference between the
water inflow and water inflow of each module's heat exchanger be the same as much as possible
Cooke Industries - Phone: +64 9 579 2185
15
Email: sales@cookeindustries.co.nz
Installation Requirements
Web: www.cookeindustries.co.nz
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