Safety; Preparing And Checking The Water Circuit Connection; Water Pressure; Hydraulic Diagram - Daikin EWAT016CZN-A1 Installation, Maintenance And Operation Manual

Model
EWAT/EWYT016CZ(N/P/H)-A1
EWAT/EWYT021CZ(N/P/H)-A1
EWAT/EWYT025CZ(N/P/H)-A1
EWAT/EWYT032CZ(N/P/H)-A1
EWAT/EWYT040CZ(N/P/H)-A1
EWAT/EWYT040CZ(N/P/H)-A2
EWAT/EWYT050CZ(N/P/H)-A2
EWAT/EWYT064CZ(N/P/H)-A2
EWAT/EWYT090CZ(N/P/H)-A2
Table 3 – Flow Switch Setpoint
To ensure correct operation of the unit, the value of the water flow in
the evaporator must be within the declared range for that unit. A water
flow lower than the minimum value shown in the following table (table
4) could cause problems with freezing, fouling and poor control. A
water flow rate higher than the maximum value shown in table 4 will
result in an unacceptable load loss and excessive erosion of the
pipes, with vibrations that can cause breakage
N – Naked Version
MODEL
EWAT/EWYT016CZN-A1
EWAT/EWYT021CZN-A1
EWAT/EWYT025CZN-A1
EWAT/EWYT032CZN-A1
EWAT/EWYT040CZN-A1
EWAT/EWYT040CZN-A2
EWAT/EWYT050CZN-A2
EWAT/EWYT064CZN-A2
EWAT/EWYT090CZN-A2
P – H Pump version
MODEL
EWAT/EWYT016CZ(P/H)-A1
EWAT/EWYT021CZ(P/H)-A1
EWAT/EWYT025CZ(P/H)-A1
EWAT/EWYT032CZ(P/H)-A1
EWAT/EWYT040CZ(P/H)-A1
EWAT/EWYT040CZ(P/H)-A2
EWAT/EWYT050CZ(P/H)-A2
EWAT/EWYT064CZ(P/H)-A2
EWAT/EWYT090CZ(P/H)-A2
Table 4 – Operating limits

4.7.3. Preparing and checking the water circuit connection

The units have water inputs and outputs for connecting the heat
pump to water circuit of the system. This circuit must be connected to
the unit by an authorized technician and must comply with all
regulations on the subject.
DEIMHP0140521_00EN
12
Flow switch Setpoint
[l/min]
22
22
22
31
31
57
57
57
57
Min Flow Max flow
[l/s] [l/s]
0.44 2.34
0.84 2.66
0.84 2.66
1.01 2.66
1.01 2.66
1.41 6.00
1.41 6.00
1.41 6.00
2.43 6.66
Min flow Max flow
[l/s] [l/s]
0.44 1.70
0.84 1.90
0.84 1.90
1.01 2.66
1.01 2.66
1.41 3.89
1.41 3.89
1.41 5.50
2.43 6.00
If dirt penetrates the water circuit, there could be
problems.
Therefore, always remember the following when
connecting the water circuit:
Only use pipes that are clean inside.
■
Keep the end of the pipe facing downward when
■
removing any burrs.
Cover the end of the pipe when inserting it through
■
a wall to avoid dust and dirt getting in.
Clean the pipes of the system located between the
■
filter and the unit, with running water, before con-
necting it to the system.

4.7.4. Water pressure

Check whether the water pressure is above 1 bar. If it is lower, add
water.
The maximum operating pressure is 3 bar for P and H versions.
For N version please take care that the components installed in the
field piping can withstand the water pressure "maximum 3 bar + static
pressure of the external pump" and not exceeding 10 bar.

4.7.5. Hydraulic diagram

The unit is supplied with the following hydraulic components:
WATER CIRCUIT
Figure 8 – Hydraulic diagram
WATER CIRCUIT EQUIPMENT
a PUMP
d DRAIN
e PLUGGED FITTING
f SAFETY VALVE 3BAR ½"
g SHUT OFF VALVE
h AIR VENT
If air, moisture or dust gets into the circuit problems may occur. To
prevent this use shut-off valves, and water filter which are delivered
with the unit.
N.B. The Pump kit is optional
m EXPANSION VESSEL
y WATER FILTER
TT TEMPERATURE SENSOR
PI PRESSURE GAUGE
FS FLOWSWITCH
EWYT~CZ / EWAT~CZ