On-off drives (Alpha AA) controlled by a relay output

Heating, ventilation 19.03.2020 08:23 19.03.2020 08:23

ny relay output of the system can be used for switching the drive (typical power consumption of the drive is about 3 W). It is recommended to use the C-IR-0202S module for switching at the drive location; the module is fitted with a 3 A relay output with a relatively quiet relay (the switching noise needs to be considered e.g. in the bedroom) and two inputs (e.g. for room temperature and a window contact).

Any relay output can be used for switching using an element in the control panel, e.g. the outputs in the C-HM-1113M etc.

Fig. 1. An example of connection – a two-position drive (actuator) for radiator valves

Notes:

The Alpha AA drives (230 VAC and 24 VDC/AC) have continuous power consumption about 1.8 W. The power supply (protection) must have big enough capacity for a higher short-term inrush current after switching (up to 300 mA per actuator for up to 2 minutes). Similar values are also common in electrically controlled actuators of most manufacturers. The drive should always include a separately ordered VA valve-adapter (see below).

Basic parameters of two-position controlled Alpha AA drives:

Selection of the operating voltage is determined by the customer.

Objekt OLE

The voltage-free state (open or closed) depends on whether you prefer minimizing power consumption (controlled radiators in an insulated house will be closed most of the year and it is therefore preferable to keep them normally closed), or if you prefer for the valves to stay open in a power outage, so that the heating would remain functional (the voltage-free state is open).

This actuator is one of the smallest. Installation and removal is easy. The Alpha actuator can be used for a wide range of commercially available thermostatic valves due to its fitting on the valve-adapter VA. A simple visual indicator shows precisely what position the actuator is in. The actuator includes a safeguard against theft.

An overview of VA valve-adapters according to manufacturers on the market of available valves:

THE LOW VERSION
The rod	Type	Manufacturer
M 30 x 1.5 White-grey	VA80	Heimeier Herb MNG (od 1998) Onda Oventrop (od 1997) Schlosser Siemens Simplex	Beluco (od 2005) Bohnish-BK (od 1998) Cazzaniga Dumser Honeywell&Braukmann Ivar Reich (rozdělovač) Taco
M 30 x 1.5 Dark grey	VA50	Honeywell&Braukmann Reich (rozdělovač) Landys&Gyr Gazzaniga
M 30 x 1.5 light grey	VA10	Beluco Dumser Simplex
M 30 x 1 White	VA39	Oventrop (before 1997)
M 28 x 1.5 Red	VA16	Herz	Polytherm
M 28 x 1.5 Dark grey	VA54	MMA
M 28 x 1.5 Light green	VA32	Tour & Andersson
Ashen	VA26	Giacomini (not applicable as a corner valve)
M 30 x 1.5 Red	VA02	Velta
THE HIGHER VERSION
White	VA78	Danfoss RA	Flasch
Light grey	VA59	Danfoss RAVL/L	Flasch
Ashen	VA72	Danfoss RAV	Flasch
M 30 x 1 Light blue	VA 04 H	Baluco (before 2005)
M 28 x 1.5 Red	VA 16 H	Herz
M 30 x 1.5 Chocolate	VA 19 H	Viega
Ashen	VA 26 H	Giacomini (a corner valve)
white-grey	VA 80 H	Bohnisch (SBK) (H) (since 1998)
M 30 x 1.5	VA 81 H	Kermi (radiators) Strawa (before 2003)
M 28 x 1.5 Yelow	VA 70 H	Comap , Universa (before 1999)
M 30 x 1.5 Orange	VA 63 H	Universa (since 1999)
M 30 x 1.5 Crimson red	VA02	Velta
M 30 x 1 Light yellow	VA94	Rotex
Light blue	VA 97 H	Temset

The drive (the NC model) takes about 2 minutes to open after power supply is switched on (there is a delay the first minute without any visible activity); the delay of the signalling ring is about 3 minutes. It takes about 5 minutes for the drive to close (first the signalling ring is inserted, and then the actual mechanism controlling the valve).