The HERZ 7708 modulating motor valve drive (1-7708-42) is an electromotive actuator for continuous control of valves in heating and cooling systems. It is controlled by a 0–10 V DC signal from a BMS/DDC controller or room thermostat, and pairs with HERZ M28 x 1.5 valves including the 4006 SMART PICV used in HerzCON 4600 DN15–DN20 valve stations.
The drive runs on 24 V AC/DC, is normally closed, and delivers 200 N actuating force over a maximum 8.5 mm stroke. It mounts with the red M28 x 1.5 adapter supplied in the box. A backlit LCD display shows the current stroke, control voltage and operating mode, and displays error codes, which makes commissioning and fault finding quicker.
A plug-in connection cable and a manual stroke setting are included, so the valve can be opened for flushing, maintenance or dismantling without power. Paired with a HERZ PICV, the modulating drive gives full-stroke control at any flow setting. For simple open/close control, see the HERZ 7708 3-point drive (1-7708-40 / 1-7708-41).
FlowQuip supplies HERZ products in New Zealand. For project pricing, actuator selection or help matching drives to valves, contact our team.
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