Daikin EWAH TZ D Series, Инструкция по установке, эксплуатации и обслуживанию, Страница: 32 / 53

D
–EIMAC01905-23_00EN - 32/53
-
A suitable device that can maintain the water system under pressure (expansion tank, etc.).
-
Water temperature and pressure indicators to assist the operator during service and maintenance.
-
A filter or any device that can remove particles from the fluid. The use of a filter extends the life of the evaporator
and pump and helps to keep the water system in a better condition.
The water filter must be installed as close
as possible to the chiller . If the water filter is installed in another part of the water system, the Installer must
guarantee the cleaning of the water pipes between the water filter and the evaporator. If the unit is provided with
hydronic freecooling system, an
additional filter is installed by factory on the water manifold before the MCH
coils to prevent clogging. However a water filter at the head of the circuit is always mandatory.
-
Recommended maximum opening for strainer mesh is:
•
1.0 mm (BPHE)
•
0.87 mm (DX S&T)
•
1.2 mm (Flooded)
-
Evaporator with an electrical heater controlled by the unit logic that ensures protection against water freezing at
water temperatures lower than antifreeze setpoint.
-
ll the other water piping/devices outside the unit must therefore be protected against freezing.
-
The heat recovery device must be emptied of water during the winter season, unless an ethylene glycol mixture
in appropriate percentage is added to the water circuit.
-
If case of unit replacement, the entire water system must be emptied and cleaned before the new unit is installed.
Regular tests and proper chemical treatment of water are recommended before starting up the new unit.
-
If glycol is added to the water system as anti-freeze protection, pay attention to the fact that suction pressure will
be lower, the unit’s performance will be lower and water pressure drops will be higher. All unit-protection systems,
such as anti-freeze, and low-pressure protection will need to be readjusted.
-
Before insulating water piping, check that there are no leaks. The complete hydraulic circuit must be insulated to
prevent condensation and reduced refrigeration capacity. Protect the water pipes from frost during winter (using
for example a glycol solution or a heating cable).
-
Check that the water pressure does not exceed the design pressure of the water side heat exchangers. Install a
safety valve on the water pipe downstream of the evaporator.
4.6.2 Kit pump option
The optional pump kit can be provided with an autorefill system that can be forbidden in some countries; all installations
must be carried out in compliance with local laws and regulations.
Fig. 24
– Hydraulic diagram (opt. 78-79-80-81/120e-120f-120g-120h)
Table 12
– Legend hydraulic diagram
a Single Pump m Plugged fitting
c Twin pump o
Flow switch fitting ½ ”G or 1”G
d Valve p Automatic filling valve fitting
e Check Valve q Plugged fitting
f Safety Valve r Water filter
g Plugged fitting TT Temperature sensor
h Air vent TS Temperature switch
i drain PI Pressure gauge
k Electrical heater FS Flowswitch
l Check valve