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Automatic Vent Control System At Northern Polytunnels we have brought together selected components to allow you the full automation of your side ventilation systems.
240v Mains
Inside Temperature Vent Controller
There is a simple swap from your existing manual gearbox to the new 24vDC reversing motor and then you will need a control panel (SVA01) to operate the motor and the automatic vent controller (SVA05) for automatic operation.
Outside Temperature Emergency Overide
Signal
24vDC
240v Mains Driver Unit
Driver Unit
Each driver unit (SVA01) can control two motors and the automatic vent controller (SVA05) can control multiple driver units.
Driver Unit
24vDC
24vDC
Polytunnel Vent Motor (SVA07)
Supplied with 26mm ID/36mm OD coupler to suit a range of drive tubes, but we can make adaptors for other sizes (call for details). Roller guide carriage available for use on a 32mm 35mm OD vertical guide rail, or alternatively it can be used on a pivoting telescopic arm. Application: Sidewall ventilation, roof ventilation and screening motor.
Roller Guide Carriage
Bare Drive Shaft Diam: 16mm OD. Drive Shaft Coupling: 26mm ID / 36mm OD. Electrical Input: 24vDC +/- 10%. Max. Current: 3.5A (84W). RPM: 3.3. Torque: 60Nm. Weight: 2.4Kg. Limit Range: 1-35 revolutions. Wire: 2 core 1.25mm.
Automatic Vent Controller (SVA05)
Motor Driver Unit (SVA01)
This micro-computer has three inputs, enabling it to make decisions based on the greenhouse air temperature, outside air temperature (or rainfall with an optional rain sensor), and an emergency high temperature sensor. Under normal operation you would set the desired greenhouse temperature. When the temperature exceeds this the vents start to open in increments. A ‘waiting time’ can be programmed between the increments allowing the temperature to stabilise before further operation. Likewise, when the greenhouse temperature starts to fall below the desired temperature, the same happens in reverse as the vents close. A buffer can be set, of say 3°C of the desired temperature, where operation is delayed until further fluctuations occur. In the event of a sensor failure, an ‘emergency’ high temperature sensor will command the vents. An outside temperature sensor (supplied) or rain sensor (optional extra) can also be used to make ventilation decisions. The temperature set point and current temperature are permanently displayed. Proportional control across the full temperature range of +5 to +45°C. Unit Includes: Inside temperature sensor Outside temperature sensor Emergency high temperature sensor Connection box for signal driver unit / control panel
Ref
This control panel can operate up to two 24vDC vent motors, either independently or together. Switch control for forward and reverse operation when in manual mode. The automatic function can be switched on if an automatic vent controller is connected, allowing fully automatic operation of your vents. Each driver unit operates 1 or 2 vent motors. Power Input: 240v (single phase) Power Output: 2 x 24vDC Description
Price
SVA 05
Automatic Vent Controller
£299.00
SVA 01
240vAC / 24vDC Motor Driver Unit (Control Panel)
£199.00
SVA 07
24vDC Polytunnel Vent Motor
£139.00
SVA 08
Roller Guide Carriage For 32mm - 35mm Tube
£62.00
HEATING, LIGHTING, VENTILATION AND CLIMATE
This motorised vent winder is 24vDC driven geared motor with in-built limit switch, and can be used for manual or automatic operation. Forward and reverse operation from 1-35 revolutions.