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1002595 ISSUE 5 M172 VARIHEAT
3.3 PLUMBING INSTALLATION
LPHW plumbing
1. The LPHW connections for connecting the boiler water flow and return to
the Variheat are:
2. ¾" BSPM on AA600/900
1" BSPM on AA1200/1500
3. Suitable breakable couplings, isolation, and drain down valves should be
installed in the boiler water flow and return pipes local to the Variheat.
4. LPHW circuits inside the Variheat should be bled for air pockets. (Bleed
valves fitted internally).
5. A filter or magnetic trap needs to be in the boiler circuit to prevent the
heat exchanger in the Variheat from blocking up.
6. Refer to the boiler manufacturers instructions before designing the
pipework system.
The Variheat should be connected as shown in section 3.0.
Condensate drain
1. The condensate driptray in the Variheat collects the water removed by
the dehumidification process, It is therefore necessary to ensure that the
Variheat III is placed on a level plinth so that the condensate can run away
and not overflow the edges of the driptray inside the machine.
2. All Variheat 3 models have a ¾” BSPM threaded condensate drain
connection. The drain pipe should run away with adequate fall to waste ie
½” per foot min. and must incorporate a ‘U’ trap and tun dish.
Important general points
1. Do not route water pipes across service access panels or air inlet/outlets.
2. The water circuits to and from the Variheat should be capable of
maintaining the specified water flow required.
3. All pipe work must be adequately supported with allowance for
expansion and contraction.
4. It is recommended that when installing water systems the last
connections to be made should be adjacent to the Variheat III to avoid
undue stresses on the unit connections.
5. See warranty exclusions on page 68. for total list of water quality
limits.
Summary of Contents for Variheat AA1200
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