ISPK Modular compact heat pumps Electrical connections between the modules CIATrtc control Outdoor module SPK Indoor module Mixing box Power supply 1 SPK (optional) pGD1 Terminal 2 W5 Control indoor module W96 Indoor fan power supply W90 Control indoor fan ambient probe 3 W30 modules connection NTC (std) or RS485 (opt.) W37 Electrical heaters safety (opt.) W41 Electrical heaters stage 1 (opt.) W42 Electrical heaters stage 2 (opt.) TCO user terminal (optional) 4 Remote on/off(optional) 5 Main failure signal(optional) 6 Outdoor RH probe(optional) 7 CO air quality probe (optional)2 8 No. ISPK 90 120 160 180 200 240 280 320 360 420 485 1 Power supply 400 III (±10%) 3 + GND 2 pGD1 terminal connection (standard in electrical panel) Telephone cable 6 wires standard (RJ12 connector) (until 50 m) NTC 2 wires 3 Ambient probeÀ RS485Á 5 wires 4 TCO user terminal connection 2 wires for power supply 230V + 1 shielded cable for communication type AGW20 / 22 (1 braided pair + drainwire + shielding) 5 Remote on/off (optional) 2 wires 6 Main failure signal (optional) 2 wires 7 Outdoor RH probe (optional)À 3 wires 8 CO air quality probe (optional)2 À 3 wires W5 ÄControl indoor module 5 wires W96 ÄIndoor fan power supply 4 wires W90 ÄControl indoor fan 7 wires without free-cooling (std) 2 wires W30 ÄModules connection free-cooling (opt.) 7 wires W37 ÄSafety thermistors of electrical heaters (optional) 2 wires W41 ÄElectrical heaters. stage 1 (optional) à 4 wires W42 ÄElectrical heaters. stage 2 (optional) à 4 wires À Connection of probes by client Á It is possible connect from 1 to 4 ambient probes RS485 in series in the Field-bus of the control board  If the unit is going to be installed in an industrial environment with a high level of electromagnetic interference, it is recommended to shield the cables of the thermostat control. à The power supply for the electrical heater must be protected by an automatic switch and/or fuses to be foreseen by the installer. Ä Connection hose to connect the modules supplied to work in compact version. CATALOGUE 2021 277 277