DENMARK: Danfoss has announced its latest pressure independent control valve solution – the AB-QM 4.0 Flexo – for fast installation, flushing and servicing of fan coil units in hydronic HVAC systems.
The AB-QM 4.0 Flexo connection set is available in DN15 and DN20. Sets in DN15 contain an AB-QM 4.0 PICV valve with low flow, normal flow or high flow, covering design flows from 20 – 1200 l/h. The DN20 sets come with a normal flow or high flow AB-QM 4.0 valve and cover design flows from 110-1900 l/h.
Pre-assembled to simplify installation, commissioning and servicing, the set consists of an AB-QM 4.0 PICV, three 2-way ball-valves, a strainer with integrated drain valve and three test plugs for pressure or flow measurements.
With these, the set provides an 8-in-1 solution for hydronic balancing, control, measuring, installation, flushing, filling, draining and servicing.
For both DN15 and DN20 sets, matching flexible stainless-steel connection pipes and EPP insulation are available. The flexible pipes are designed to simplify the connection from the set to the fan coil unit. The insulation prevents heat losses from the set. With the insulation mounted, Danfoss says it is still possible to see and get access to the PICV valve design flow setting, to drain the FCU and to measure flows and pressures.
All standard Danfoss actuators for AB-QM 4.0 valves can be used, from TWA-Q thermal on/off actuators, to AME modulating gear actuators, to the Danfoss NovoCon S high-accuracy digital actuator with BACnet or Modbus bus-communication for integration with Building Management Systems (BMS).