Electrical connections
CS3000 AWP – 6721852570 (2023/04)
52
• COOL/HEAT - Remote winter/summer selector
• ON/OFF - Remote ON/OFF selector
• TEMP-SW - Remote selector for set-point change
• RB1/RB2 - Resistance of the anti-condensation pan
Fig. ( Graphic 385, Connections by the customer - Additional board
(APR board for CS 3000 AWPCS 3000 AWP - AWP16AWP59)
• SA4 - Remote ON/OFF selector
• SA5 - Remote “heating/cooling” selector
• SA6 - Sanitary water cycle selector
• SA7 - Second set-point enabling switch
• SA8 - Silent mode enabling selector
• SA21- EVU enabling selector
• SA22 - Smart Grid enabling selector
• REMAU BMS- BMS/ Modbus RTU communication system
Fig. ( Graphic 386, Overview placement APC-, APR board XT1 and
XT2 terminal for CS 3000 AWP AWP16 - AWP24)
Fig. (Graphic 387, Overview placement APC-, APR board XT1 and
XT2 terminal for CS 3000 AWPAWP31AWP59)
Table 50 Legend of the electric scheme
• Alarm signal - ALARM
– Closed contact with alarmed unit.
– Contact on APC-board: CN24_1-2.
• Functioning compressor signal - HL1
– Connect the signal lamp as shown in the diagram.
– Contact on APC-board: CN33_COMP-STATE.
• External pump control - PUMP-N
– In case of a unit supplied with no circulation pump, control the
external pump as shown in the diagram. Use an auxiliary relay.
– Contact on APC-board: CN25_PUMP-N.
• Auxiliary heaters controls
– Contact on APC-board: CN26_HEAT1-KM1.
– The Heat1 output can be connected to an electrical heater to
prevent the water in the pipes from freezing at low temperature.
The main control for Heat1 only provides on/off signals: the
specific sizing of the heater depends on the installation needs.
– Contact on APC-board: CN26_HEAT2-KM2.
– The Heat2 output can be connected to an electrical heater on the
DHW tank, to a gas boiler on the DHW tank or to a gas oiler on the
heating system.
– The Heat2 auxiliary heater can provide the following functions:
a) If the heat pump is not able to reach the set point for a certain
time (standard time: 90 minutes) the Heat2 signal will be
activated;
b) If the compressor is not available for alarm or for ambient
conditions out of the operating range the Heat2 signal will be
activated;
c) Anti legionella function for DHW application;
d) Water set point extension;
e) The main control for Heat2 only provides on/off signals
• Modbus
– Connect on the back of the controller.Modular unit: connect the
Modbus to the MASTER unit port.
– Contact on API board: - H1 to + H2
SA4 Remote ON/OFF selector
SA5 Remote heating/cooling selector
SA6 Sanitary water cycle selector
SA7 Second set-point enabling switch
SA8 Silent mode enabling selector
SA21 EVU enabling selector
SA22 Smart Grid enabling selector
ALARM Cumulative fault signal
KM1 System auxiliary heater control relay
KM2 Auxiliary heater control relay
HL1 Compressor status signal lamp
COOL/HEAT Remote winter/summer selector
ON/OFF Remote ON/OFF selector
TEMP-SW Remote selector for set-point change
KMU Pump control contractor provided y the costumer
SPA2 System charge control pressure switch
TW Total probe to the outlet water collector
T5 Domestic hot water storage temperature probe
TAF1 Anti-freeze sensor on water on DHW side
BUS BUS for cascade units
REMAU BMS BMS / Modbus RTU communication system
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