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3 Fix the cable with cable ties to the cable tie mountings.
INFORMATION
For more information on the backup heater types, and for
how to configure the backup heater, refer to the
"Configuration" chapter of the installation manual of the
outdoor unit.
During connection of the backup heater, miswiring is possible. To
detect possible miswiring on the *9W model, it is highly
recommended to measure the resistance value of the heater
elements. Depending on the different backup heater types, following
resistance values (see table below) should be measured. ALWAYS
measure the resistance on the contactor clamps K1M, K2M, and
K5M.
3 kW
1~ 230 V
K1M/1
K5M/13
52.9Ω
K1M/3
∞
K1M/5
∞
K1M/3
K1M/5
26.5Ω
K2M/1
K5M/13
∞
K2M/3
∞
K2M/5
∞
K2M/3
K2M/5
52.9Ω
K1M/5
K2M/1
∞
Example measure resistance between K1M/1 and K5M/13:
K1M
1 3 5 13
2 4 6 14
Ω
Ω
K5M
1 3 5 13
2 4 6 14
7.8.21
To connect the backup heater kit to the
control box
INFORMATION
▪ Requires
to
be
EKCB07CAV3.
EWAQ+EWYQ004+005BAVP
Packaged air-cooled water chillers and packaged air to water heat
pumps
4P492900-1 – 2017.06
6 kW
6 kW
9 kW
1~ 230 V
3N~
3N~
400 V
400 V
52.9Ω
∞
∞
105.8Ω
105.8Ω
105.8Ω
158.7Ω
105.8Ω
105.8Ω
52.9Ω
105.8Ω
105.8Ω
26.5Ω
∞
∞
∞
52.9Ω
52.9Ω
∞
52.9Ω
52.9Ω
52.9Ω
52.9Ω
52.9Ω
132.3Ω
∞
∞
K2M
K2M
1 3 5 13
2 4 6 14
connected
to
control
box
1 For the thermistor, connect 2 wires between backup heater
terminals X15M/1+2 and control box terminals X2M/5+6.
2 For the thermal protector, connect 2 wires between backup
heater
terminals
X15M/3+4
X2M/11+12.
3 For the connection with the control box, connect 3 wires
between backup heater terminals X15M/5+6+7 and control box
terminals X2M/13+14+15.
F1B
1 2 3 4 5 6 7
X15M
4 Fix the cable with cable ties to the cable tie mountings.
INFORMATION
▪ For details about the connections, refer to the wiring
diagram.
▪ Use a multi-core cable.
▪ For backup heater kit EKMBUHCA3V3, it is NOT
required to make a connection between backup heater
terminal X15M/6 and control box terminal X2M/14.
7.8.22
To connect the valve kit
INFORMATION
Only applicable to reversible systems (heating+cooling) in
which a backup heater is installed.
1 Connect the connector that makes one end of the connector
cable (a) to X21A of outdoor unit PCB A1P and route it
according to the illustration below.
2 Using field wiring and the clamp terminal that makes the other
end of the connector cable (b), make a connection to control
box terminal X8M/10, and connect outdoor unit terminals
X3M/1+2 to control box terminals X8M/6+7.
7 Installation
and
control
box
terminals
X2M
15
A4P
14
13
12
11
6
5
X1M
X8M
Installer reference guide
45
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