| Parameter | Symbol | Min | Typ. | Max | Unit |
| | | 6 | | 12 | V |
| Power supply voltage | Vcc | 5.5 | | 12 | V3 |
| | | | | |
The valve MUST NOT be fitted on the return pipework under any circumstances. Flow from the boiler must be connected to port AB, the radiator circuit to port A and the hot water cylinder circuit to port B. The valve may be plumbed in at any angle but must not be mounted so that the valve head is below the horizontal level of the pipework. In the unlikely event of a leak a safety hazard could result. Do not grip the valve head while making and tightening up plumbing connections. Attach a spanner (32mm or l'/4" AF) onto the valve body at each port, whilst bghtening up the nuts. Tighten compression nuts enough to make a watertight seal. TAKE CARE NOT TO OVERTIGHTEN.