[ VII Control ]
- 88 -
HWE10060 GB
Control Metho d
-12- Automatic operation of pump for freeze-up protection
1. Purpose
This is a function to protect the water circuit from freezing up in winter.
2. Pump wire connection
3. Natural freeze-up protection
The units will operate according to the dip switch SW2-1 on the control board as shown in the table below.
Dip switch settings SW2-1 OFF SW2-1 ON
Control method Natural freeze-up protection based
on both the outside temperature
and the water temperature
Natural freeze-up protection
based on both the outside tem-
perature and the water tempera-
ture
Details Pump start conditions "Outside temperature is within ±1 ºC
of 1 ºC" OR "Inlet water
temperatureis within ±1 of 3 ºC "
Same as left
Pump stop conditions "Outside temperature is more than
±1ºC of 3 ºC" OR "Inlet water
temperature is more than
±1ºC of 5 ºC"
Same as left
765 3214
12
4123567
1234
234576 1
312
power supply
3N~
50Hz
380/400/415V
yellow
CN512
H21H20
N
X21
X20
X21
X20
Drain pan
heater
Emargency
signal
(for extra
heater)
X09
X08
Error display output
Operation display
output
72C
Pump operation
command output
X04
X05
X06
X07
70
A
B
CN102
MA
MB
No-voltage contact output
SV2
73 72 7175 74
CN510
blue
CN511
TO SUB BOX TB3
pump error
51P
52P
ELB2
M
3~
MP
L2
LED2:CPU in operation
Transmission cable for multiple unit control
Measurement terminal for maintenance(M-NET)
PL
L1
52P
L3
F2
Contorol
power circuit
TB6
TB5
CNDC
Pink
CN52C
red
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