5 Application guidelines
Installer reference guide
18
EWAQ+005BAVP
Packaged air-cooled water chillers and packaged air to water heat
pumps
4P492900-1 – 2017.06
Calculating the consumed energy
▪ The consumed energy is calculated internally based on:
▪ The actual power input of the outdoor unit
▪ The set capacity of the optional backup heater
▪ The voltage
▪ Setup and configuration: To get accurate energy data, measure
the capacity (resistance measurement) and set the capacity via
the user interface for the optional backup heater (step 1 and
step 2).
Measuring the consumed energy
▪ Preferred method because of higher accuracy.
▪ Setup and configuration:
▪ Requires option box EK2CB07CAV3.
▪ Requires external power meters.
▪ When using electrical power meters, set the number of pulses/
kWh for each power meter via the user interface.
INFORMATION
When measuring the electrical power consumption, make
sure ALL power input of the system is covered by the
electrical power meters.
5.4.3
Normal kWh rate power supply
General rule
One power meter that covers the entire system is sufficient.
Setup
▪ Install control box EKCB07CAV3 and option box EK2CB07CAV3.
▪ Connect the power meter to X2M/7 and X2M/8 of option box
EK2CB07CAV3.
Power meter type
In case of…
Use a… power meter
Backup heater supplied from a
single-phase grid (i.e. the backup
heater model is *3V or *9W
connected to a single-phase grid)
Single-phase
In other cases (i.e. a *9W backup
heater model connected to a
three-phase grid)
Three-phase
Example
Single-phase power meter
Three-phase power meter
b
c
c
e
d
A
B
C D
a
f
g
580
1 50
0
0
A
Outdoor unit
B
Control box
C
Option box
D
Backup heater kit
a
Electrical cabinet (L
1
/N)
b
Power meter (L
1
/N)
c
Fuse (L
1
/N)
d
Outdoor unit (L
1
/N)
e
Control box (L
1
/N)
f
Option box (L
1
/N)
g
Backup heater (L
1
/N)
b
f
e
h
A
B
D
c
c
d
a
g
C
580
1 50
0
0
A
Outdoor unit
B
Control box
C
Option box
D
Backup heater kit
a
Electrical cabinet (L
1
/L
2
/L
3
/N)
b
Power meter (L
1
/L
2
/L
3
/N)
c
Fuse (L
1
/N)
d
Fuse (L
1
/L
2
/L
3
/N)
e
Outdoor unit (L
1
/N)
f
Control box (L
1
/N)
g
Option box (L
1
/N)
h
Backup heater (L
1
/L
2
/L
3
/N)
Exception
▪ You can use a second power meter if:
▪ The power range of one meter is insufficient.
▪ The electrical meter cannot easily be installed in the electrical
cabinet.
▪ 230 V and 400 V three-phase grids are combined (very
uncommon), because of technical limitations of power meters.
▪ Connection and setup:
▪ Connect the second power meter to X2M/9 and X2M/10 of
option box EK2CB07CAV3.
▪ In the software the power consumption data of both meters is
added so you do NOT have to set which meter covers which
power consumption. You only need to set the number of pulses
of each power meter.
▪ See
"5.4.4 Preferential kWh rate power supply" on page 18
an example with two power meters.
5.4.4
Preferential kWh rate power supply
General rule
▪ Power meter 1: Measures the refrigerant part of the outdoor unit.
▪ Power meter 2: Measures the rest (i.e. the hydro part of the
outdoor
unit,
control
box
EKCB07CAV3,
option
box
EK2CB07CAV3, and the backup heater kit).
Setup
▪ Connect power meter 1 to X2M/7 and X2M/8 of option box
EK2CB07CAV3.
▪ Connect power meter 2 to X2M/9 and X2M/10 of option box
EK2CB07CAV3.
