Daikin UAL-A Series, Engineering Data

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The water flow must be in the rated range. If the water flow is too small, scale may accumulate and degrade the
performance of the unit, cause the antifreeze device to activate, or cause rust points and refrigerant leakage. If the
water flow is too large, the unit may be corroded due to water impact.
■ A adiabatic water tank with a proper volume is suggested to installed . If the capacity is too small, the unit might
frequently restart, which causes wear and tear on the compressor.
■ An expansion water tank must be installed at the return water side of the water system to adapt to water
pressure variations in the water supply system caused by ambient temperature changes.
An auto relief valve must be installed at the highest point in the water system. A suitable water discharge valve
must be installed at the lowest point in the water system.
■ The water pipes must be adiabatic to avoid heat loss and condensate water.
■ Please follow the "Illustration for water system installation" and drawings from the design institute while installing
the water system.
■ Install the Y-shaped water filter inside the water inlet pipe and rinse the filter screen after commissioning.
■ Before injecting water, make sure that no sand, rubble, rust, soldering tin residue or other impurities exist in the
pipe, as these things might damage the heat exchanger.
■ While rinsing the water system, please bypass the unit and the terminal heat exchanger using by-pass valves.
Illustration for water system installation
System 1:
1
2
4
3
5
13
14
3
15
12
11
11
10
WATER INLET
7
8
9
8
WATER OUTLET
OVERFLOW OUTLET
6
TERMINAL DEVICE
TERMINAL DEVICE
WATER INLET
WATER OUTLET
OVERFLOW OUTLET
AUXILIARY ELECTRICAL HEATER
13
12
11
9
8
7
15
6
8
14
4
1
3
2
10