gledhill THP180 sol, Design, Installation & Servicing Instructions

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Page 18
INSTALLATION
C
OMMISSIONING
Commissioning
Open the incoming stop valve and fi ll the domestic hot water system. Fill the whole
of the primary heating system and the thermal store with potable water through the
feed and expansion cistern.
Check the water level in the feed and expansion cistern and adjust the ball valve
if necessary. Check the whole of the primary heating and domestic hot and cold
distribution system, including the heat pump and the Torrent HP for leaks.
It is essential that all systems function properly for optimum performance and to
achieve this:
• The primary system should be commissioned in accordance with good practice
and generally in accordance with the requirements of BS 6798, BS 5449 and BS
7593. Full details of the requirements are given in PAS 33:1999 under section 10
Commissioning.
• The heat pump manufacturers instructions should be followed during the
commissioning phase.
• If a solar thermal system is fi tted it should be commissioned as per manufacturers
instructions.
• When using either cleansing or corrosion inhibitor chemicals, the manufactures
instructions must be followed.
When determining the quantities for cleanser required, the volume of the Torrent HP
should be added to the water content of the primary system. Although the Torrent
HP has no special water treatment requirements, the radiators and other parts of the
circuit will require the application of a scale and corrosion inhibitor. The heat pump
and the external connecting pipework will also require protection against freezing.
For this reason, a combined antifreeze and inhibitor product such as Fernox Alphi
11 must be used.
If it is proposed to ‘powerfl ush’ the heating system we would recommend that the
Torrent HP is isolated from the heating system being cleaned. Failure to do so could
seriously damage the unit. If in doubt please contact our ‘Technical Helpline’.
Ensure that the Torrent HP cistern is installed with the water level topped up to the
level mark inside the feed and expansion cistern and the ballvalve is set correctly.
Ensure that the heat pump circuit and the space heating circuit are fi tted and vented
correctly.
Commission the heat pump as per the manufacturers instructions.
Check that the space heating system controls are functioning correctly ie. the
programmer and room thermostat.
Switch off the space heating and allow the heat pump to heat the store only. During
this heating cycle, adjust the store thermostats so that they switch on the heat pump
just before it starts to cycle on its internal thermostat.
Check the store thermostat setting by drawing off the hot water and reheating the
thermal store.
If necessary, use the immersion heater to boost the store temperature. If the immersion
element is used to raise the temperature of the store, then a suitable control system
should be used to ensure the immersion element does not operate until the heat
pump has raised the store to the maximum temperature, or the overall effi ciency of
the system will be reduced. Check that the total hot water fl ow rate from the Torrent
HP is a maximum of 15 - 17 litres/min. If necessary fi t additional fl ow restrictors.
Important Do’s and Don’ts
DO - Check the incoming mains water
pressure. If it exceeds 3.5 bar at any
point in a 24 hour cycle then a pressure
limiting valve set at 3.5 bar should be
fi tted where the cold supply enters the
property.
DO - Check that all connections are in
accordance with the labelling on the
thermal store.
DO - Fill the cistern manually or adjust the
ballvalve so that the water in the F &
E cistern is set to the correct level.
DO - Restrict the ballvalve fill rate when
full so that the overflow pipe can
cope with the fi ll rate in the event of a
ballvalve failure.
DO - Make sure there is adequate clearance
above the F & E cistern to service the
valve.
DO - Ensure that the water level in the
expansion cistern is at least 250mm
above the highest point on the
radiator circuit and satisfi es the boiler
head required.
DO - Insulate any exposed pipework in the
Torrent cupboard.
DO - Plumb the overfl ow warning pipe in
20mm minimum internal diameter
tubing to discharge in a conspicuous
e x t e r n a l p o s i t i o n , u s i n g h i g h
temperature uPVC or copper.
DO - Check the pump setting. This should
be set to give a temperature difference
recommended by the manufacturer of
the heat pump.
DON’T - Use a combined feed and vent on
Torrent indirect installations.