Service Center Solahart (081313462267) water heater | Page 16

33-1197 Solahart Owner‟s Manual – Thermosiphon Systems - Revision H – Nov 2013

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EXPANSION CONTROL VALVE

Local regulations may make it mandatory to install an expansion control valve (ECV) in the cold water line to the water
heater. In other areas, an ECV is not required unless the water saturation index is greater than +0.4. For this Solahart water
heater an RMC H50 Cold Relief Valve (part no 45-1103) is supplied in the parts kit for use as the ECV. Solahart
recommend its fitment in all instances.
The ECV must always be installed after the TRIO valve (part no 33-1675), and must be the last valve installed prior to the
water heater (see a typical cold water configuration page 14). A copper drain line must be run separately from the drain of
the TPR valve. The TRIO valve in the cold water inlet line also enables the water to be turned OFF for servicing purposes.
DRAIN LINES - GENERAL

The TPR valve and ECV should both have drain pipes connected to their outlets. These pipes should run to ground level
where hot water discharge is safe and clear of any paved areas. Do not seal or block the ends of these drain pipes or the
valve outlets. Do not allow water from the valve outlets or drain pipes to drip or discharge onto roofing materials or roof
gutters.
Where a drain line crosses over a metal roof, the pipe work must be fully insulated with weatherproof lagging to offer
corrosion protection to the metal roof against water runoff over the copper pipe. The insulation must be UV resistant if
exposed.
WATER PRESSURE

Solahart advises the limiting of water pressure to 500kPa with a pressure limiting valve to suit this solar water heater and its
associated pressure relief valves. Refer to local plumbing codes (e.g. AS/NZS3500.4) for specific requirements of
permissible supply pressure and associated reduction/limiting valve type applicability.
COLD SUPPLY LINE VALVE LOCATION

All the valves in the inlet cold supply line (i.e. the TRIO valve and ECV) must be located at least 1 metre away from the
water heater and readily accessible from ground or floor level to enable homeowner operation without the need for a ladder.
The valves should not be located on the house roof and NOT IN THE CEILING SPACE.
SUPPLEMENTARY ENERGY SUPPLIES – CONSIDER THE TPR VALVE RATING

The standard TPR valve that is fitted to the tank is rated at 10 kW. Supplementary energy supplies giving a combined total
heat input in excess of 10 kW including the electric booster should not be fitted to the water heater unless the TPR valve is
replaced with another of a larger capacity.
TPR Valve (45-1104)

TRIO Valve (33-1675)
Non Return & Isolating
Valve with Strainer

Typical Cold Water Inlet Configuration

H50 Cold Relief
Valve (45-1103)