Water Charge, Flow And Quality; Water Piping Insulation; Refrigerant Piping Insulation; Antifreeze Protection For Bphe And Recovery Exchangers - Daikin EWLQ025KCW1N Installation, Operation And Maintenance Manual

pressures and temperatures of the system, it must also be resistant to the used glycol in the water.
The external surface of the water pipes must be adequately protected against corrosion.
10.2

Water charge, flow and quality

To assure proper operation of the unit a minimum water volume is required in the system and the water flow through the
evaporator must be within the operation range as specified in the table below.
10.3

Water piping insulation

The complete water circuit, inclusive all piping, must be insulated to prevent condensation and reduction of the cooling
capacity.
10.4

Refrigerant piping insulation

To prevent burning injuries by accidental touching the hot (max 135°C) discharge pipe, it must be insulated thoroughly.
A minimum of insulation to protect the liquid pipe from damage is advisable.
10.5

Antifreeze protection for BPHE and recovery exchangers

If the exchangers are completely empty and cleaned with antifreeze solution, additional methods can be used against
freezing.
The following protection methods must be considered when designing the system as a whole:
1. continuous water flow circulation inside piping and exchangers.
2. addition of an appropriate amount of glycol inside the water circuit or, as alternative, an additional heat
insulation and heating of exposed piping (internal and external to the unit).
3. if the unit does not work during the winter season, emptying and cleaning of the heat exchanger.
It is the responsibility of the installer and/or of local maintenance personnel to ensure that described antifreeze meth ods
are used.
Make sure that appropriate antifreeze protection is always maintained. Failing to follow the instructions above could
result in unit damage.
Damage caused by freezing is excluded from the warranty, therefore Daikin Applied Europe S.p.A.
declines all responsibility.
D-EIMHP01601-22_01EN 16/26

Table 6-Water flow operation range

Minimum
water volume (l)
EWWQ014 62
EWWQ025 134
EWWQ033 155
EWWQ049 205
EWWQ064 311
Minimum Maximum
water flow water flow
31 l/min 75 l/min
53 l/min 123 l/min
76 l/min 186 l/min
101 l/min 247 l/min
152 l/min 373 l/min