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6.6.2 Electrical Connection General
All connection cables must be provided on-site. The cable type (cross-
section, conductor type, etc.) must be chosen taking into account the
relevant electrical parameters (e.g. power, current, voltage, etc.) and the
applicable VDE, EN, VNB, UL and CSA regulations. Information on this
can be found in the device information (see section 10) and the rough-in
electrical documentation (secton 6.6.2).
The supply power to the HydroBox's control circuits must have a
continuous voltage. For this reason, it should be tapped upstream from
the utility company’s blocking contactor (if installed) or be connected to the
household current, otherwise important protection functions could be lost
during a utility block (utility shutting off power to the unit during a time of
peak demand, see section 6.6.3).
Major materials needed:
Circuit breakers -
15 amp - 1 pole circuit breaker; 120 volt power supply for indoor unit and communications in outdoor unit.
30 amp - 2 pole circuit breaker; 240 volt power for 4.5kW back-up electrical immersion element in DHW tank.
35 amp - 2 pole circuit breaker; 240 volt power for 6kW back-up electrical element in indoor unit for heating.
30 amp - 2 pole circuit breaker; 240 volt power for outdoor heat pump unit.
Disconnect Switches -
Outdoor rated disconnect (2 pole); 240 volt power for outdoor heat pump unit.
Outdoor rated disconnect (1 or 2 pole); 120 volt power for outdoor heat pump unit communications.
Other –
Waterproof conduit and fittings; separate conduits for 120 volt, 240 volt and communications.
Electrical wire of proper type and size to carry load of each circuit.
Twisted pair shielded wire (or CAT6) for communications between indoor unit and outdoor unit.
Ethernet cable from router/switch to indoor unit.
30 amp - 2 pole contactor (120 volt coil) for 4.5kW back-up electrical immersion element in DHW tank.
System M Electrical Rough-in Diagram
Indoor
Outdoor
120/1/60
120/1/60
Outdoor Sensor
Outdoor Unit
Indoor Unit
Indirect
Water
Heater w/
4.5kW
Electrical
Back-up
Immersion
Heater
Electrical
Disconnects
(per code)
240/1/60
L1
L2
PE
L1
L2
PE
240/1/60
L1
L2
PE
L1
L2
PE
240/1/60
L1
L2
PE
L1
L2
PE
Optional
M13
Heating/Cooling
Circuit Pump
(0-10VDC)
15 Amp
Circuit
Breaker
35 Amp
2 Pole
Circuit
Breaker
30 Amp
2 Pole
Circuit
Breaker
30 Amp
2 Pole
Circuit
Breaker
Ethernet
Cable
Power to
Back-up Electric
Immersion Heater;
Buffer Tank
Power to
Control Circuits
(Indoor and Outdoor Units)
Power to Back-up
Electric DHW Tank;
Immersion Heater
Power to
Outdoor Unit
Field Wiring
Twisted Pair
Shielded Wire
120/1/60
Power to Contactor for DHW Back-Up
Power to Controller in Outdoor Unit
Optional
Heating Demand;
Smart Grid 2
(Dry Contacts)
DHW Tank
Sensor
Optional
Forced Cooling
Change-over
(Dry Contacts)
1 +VDC
2 GND
+V
+
-
-V
NO-J11
Rx+/Tx+
Rx-/Tx-
GND
Electrical Rough-in Diagrams
6.6.3 Electrical Connection for the Heat Pump
Outdoor Unit
The wires for connection to the heat pump must be provided on site.
Recommendations with regard to design, type, etc. are provided in the
electrical documentation.
The following must be connected in order to operate the heat pump:
• Supply voltage-refrigeration circuit:
240 volt, single phase, 60 hertz power off a 30 amp 2-pole circuit
breaker needs to be supplied to the X1 terminals in the Heat Pump
outdoor unit. An all-pole disconnecting device with a contact gap of
at least 3 mm (e.g. utility company’s blocking contactor or power
contactor) must be installed in the refrigeration circuit power supply.
A 1 or 2-pole circuit breaker (trip current in accordance with device
information) for the 1 or 2-phase heat pump provides the short circuit
protection, taking into account the layout of the internal wiring. The
relevant components in the heat pump contain an internal overload
protection.
• Supply voltage-communication/ control:
120 volt, single phase, 60 hertz power off a 15 amp 1-pole circuit
breaker needs to be supplied to the X2 terminals in the Heat Pump
outdoor unit. An all-pole disconnecting device with a contact gap of at
least 3mm must also be installed in the communication/control circuit
power supply.
