There are two methods to control a SpacePak Solstice Inverter Monobloc (SIM) heat pump, 1. Digital Output and/or 2. Modbus. Depending on the SIM unit follow the instruction below.
SIM-036
- Digital Output: The two designated digital outputs on the mBox need to be connected to the corresponding terminals on the SpacePak unit:
Please ensure you connect both ground terminal 18 (GND) and 21 (GND) on the SpacePak unit to the common terminals on the mBox, which are colored blue. Neglecting to do so could lead the Heat Pump to operate in unintended heating and cooling modes.
- Modbus: To utilize Modbus communication, connect the mBox’s ATU BUS terminal B- and A+ to the following terminals on the SpacePak unit:
Using the Modbus connection offers several advantages over the Digital Output method. With Modbus, you have full remote access to the SpacePak unit, including setup, settings, real-time parameters, alarm messages, and more.
SIM-060
- Digital Output: Connect the designated digital outputs (usually D01 and D02) on the mBox to the following terminals on the SpacePak unit:
Please ensure you connect both ground terminals 26 (GND) and 28 (GND) on the SpacePak unit to the common terminals on the mBox, which are colored blue. Neglecting to do so could lead the Heat Pump to operate in unintended heating and cooling modes.
- Modbus: To utilize Modbus communication, connect the mBox’s ATU BUS terminal A+ and B- to the following terminals on the SpacePak unit:
Using the Modbus connection offers several advantages over the Digital Output method. With Modbus, you have full remote access to the SpacePak unit, including setup, settings, real-time parameters, alarm messages, and more.
Cascade of Heat Pumps
To connect the mBox to a cascade of SpacePak SIM heat pumps for a multi-stage configuration, connect each heat pump in a daisy chain configuration using Modbus.
CAUTION
The Remote On/Off and Remote Heat/Cool inputs on the SpacePak units are for voltage free relay contacts only. Any voltage introduced to the terminals will immediately destroy the primary unit control. Do not connect to any 24VDC Digital Outputs of the mBox or mZone modules.
CAUTION
Always follow safety protocols when working with electrical equipment. If unsure, consider hiring a professional for installation or modifications.