Horne Engineering Ltd
Issue 3 8/05
1
HORNE
Horne Engineering Ltd
PO Box 7, Rankine Street
Johnstone, Renfrewshire
Scotland PA5 8BD
Tel 01505 321 455
Fax 01505 336 287
Email
HORNE 25 THERMOSTATIC MIXING VALVE
Type H-2501
Installation, Commissioning, Operating & Maintenance Instructions
1 Installing the Horne 25 TMV
1.1
Install the Horne 25 TMV as close as possible to the outlet to comply with HTM
2027 and HTM 2040. The dead leg from the Horne 25 TMV to the outlet should
not exceed 2 metres.
1.2 The Hot & Cold water supplies should be from a common source, i.e. the static
pressures should be equal.
1.3 Isolating valves must be fitted to the hot & cold water supply pipes.
1.4 The Horne 25 TMV can be fitted in any attitude with the mixed water outlet
pointing upwards, downwards, horizontally or at any angle between these planes.
2 FLUSHING OF PIPEWORK TO WATER SUPPLY BYLAWS (SCOTLAND) 2003
AND THE WATER SUPPLY (WATER FITTINGS) REGULATIONS 1999.
2.1 The most common cause for complaint regarding the performance of a valve is
traced to dirt or debris in the TMV or check valves.
2.2 Before a Horne 25 is commissioned, the hot and cold water pipework should be
thoroughly flushed using the FLUSHING KIT shown in the diagram overleaf. The
FLUSHING KIT comprises a screwed adapter to fit the strainer body and a plastic
pipe to enable water to be flushed to drain. The kit may be ordered separately.
2.3 DO NOT FLUSH THE PIPEWORK BY REMOVING THE STRAINER
BASKETS AND OPENING THE TAPS.
2.4
DO NOT OPEN the hot water tap before flushing the hot and cold water pipework.
