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HORNE H-2501 Installation, Operating, & Maintenance Instructions

Thermostatic mixing valve
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HORNE
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.
Issue 3 8/05
Horne Engineering Ltd
1
Horne Engineering Ltd
PO Box 7, Rankine Street
Johnstone, Renfrewshire
Scotland
PA5 8BD
Tel 01505 321 455
Fax 01505 336 287
Email
technical@horne.co.uk
Web
www.horne.co.uk

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Summary of Contents for HORNE H-2501

  • Page 1 Installation, Commissioning, Operating & Maintenance Instructions 1 Installing the Horne 25 TMV 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.
  • Page 2 Horne Engineering Ltd The flushing procedure is as follows :- During this procedure, keep the hot and cold water taps closed. Close the hot and cold water ISOLATING VALVES. Unscrew the END CAP (16) and remove the STRAINER BASKET (14) from the strainer at the hot inlet.
  • Page 3 The temperature of any water coming from the tap should not be more than 2C above the mixed water temperature measured in 3.3 above. 3.5.2 If the Horne 25 TMV performs satisfactorily, close the hot water tap and open the cold water isolating valve.

  • Page 4: Temperature Adjustment

    Horne Engineering Ltd 3.6.6 Remove the hot water inlet STRAINER CAP (16) at the inlet to the Horne 25 TMV. After initial draining of water, there should be no flow whatsoever. This indicates that the check valve at the hot water inlet is giving a tight shut-off.

  • Page 5: Maintenance Procedures

    BASKETS (14). Clean the baskets and descale them, if necessary. THERMOSTATIC MIXING VALVE MECHANISM. Minor maintenance can be carried out with the HORNE 25 in situ :- 6.4.3 Unscrew VALVE COVER (3). Remove THERMOSTAT ELEMENT ASSEMBLY (6), SLIDE VALVE ASSEMBLY (7) and RETURN SPRING (8).

  • Page 6: Major Maintenance

    6.5.9 Reassemble the HORNE 25 TMV. Re-Assembly 6.6.1 When fitting new "O" rings, it is advisable to smear them sparingly with a WFBS listed silicon grease. 6.6.2 Insert the components into the HORNE 25 TMV in the order shown on Drawing 7311. Issue 3 8/05...
  • Page 7 Horne Engineering Ltd 6.6.3 Insert the ADJUSTING SCREW (2) into the VALVE COVER (3) and turn anti- clockwise until the top of the ADJUSTING SCREW (2) is approximately 5mm below the top of the lockshield. 6.6.4 When the internal components have been located loosely in the valve body, place...
  • Page 8 Horne Engineering Ltd Issue 3 8/05...

  • Page 9: Fault Finding Chart

    Slide-Valve (9) is seized Valve requires de-scaling respond to adjusting screw Hot and cold inlets reversed Remove HORNE 15 TMV from pipes and reverse connections. Connect inlet with red dot to hot pipe Mixed water temp changes Slide-Valve (9) is seized...

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