28
Diameter of the
steel tube (mm)
Closed water system Open water system
Water ow (m
3
/h) kPa/100m Water ow (m
3
/h) kPa/100m
80 18 - 32 10 - 60 14 - 22 --
100 32 - 65 10 - 60 22 - 45 --
125 65 - 115 10 - 60 45 - 82 10 - 40
NOTE: PARAMETERS IN THE PRECEDING TABLE MAY VARY BASED ON THE DESIGN MANUAL. FOR DETAILS, SEE THE "HVAC
DESIGN MANUAL".
Water Storage Tank Volume Calculating
Vmin is referred to the below table:
Model Setting EWT(°C) Vmin(L)
UAL160A5
14 195
13 231
12 282
11 362
10 507
9 846
UAL210A5
14 238
13 281
12 344
11 442
10 619
9 1032
NOTES:
1. THE TOTAL WATER VOLUME OF THE ENTIRE HYDRAULIC SYSTEM INCLUDES THE WATER IN MAIN PIPE, WATER TANK AND
TERMINAL EQUIPMENTS, IN WHICH THE 2-WAY VALVE IS OPEN.
2. IF THE WATER VOLUME (V) WHILE THE UNIT IS RUNNING IS LESS THAN VMIN, IT'S RECOMMENDED TO INSTALL A WATER TANK
OF (VMIN-V)L, OR IT WILL CAUSE THE UNIT FREQUENT ON/OFF.
3. THE VMIN IN THE TABLE IS CALCULATED BASED ON NOMINAL COOLING WATER FLOW AND 5°C ANTI-FREEZE. IF THE WATER
FLOW AND ANTI-FREEZE TEMPERATURE CHANGE, RELATED VMIN WILL CHANGE.
4. THE TABLE IS APPLIED FOR THE WATER VOLUME SELECTION OF NORMAL CHILLER, NOT FOR THE CHILLER UNDER LOW
LEAVING WATER TEMPERATURE WITH GLYCOL.
Calculating Volume of Expansion Water Tank
An expansion water tank with a proper volume must be installed to adapt to water volume changes as the
temperature changes and avoid freezing burst and pressure instability at the water pump inlet.
The expansion water tank can also be used to supplement water and discharge air.
Calculating volume of expansion water tank.
Vp=α*Δt*Vs
Vp---- effective volume of the expansion water tank (volume of water between the signal pipe and the overow pipe). m
3
α----volume expansion coefcient of water (α =0.0006/°C)
Δt----max. water temperature variation °C
Vs----water volume in the system (total water volume in the system and pipes) m
3
Model Selection Principles for the Water Circulation Pump
Water ow in the water circulation pump ≥ rated water ow × 1.1
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