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2.2.3.1 SOLAR CONNECTIONS: SINGLE COIL
The flow and return from the solar heat source are to be connected to the lower coil. Either primary coil connection may be
utilised as the flow or return. The solar sensor, supplied as part of the solar controls, is inserted into the sensor well above the
solar coil and is held in place with the black sensor well retaining bung provided.
2.2.3.2 SOLAR CONNECTIONS: TWIN COIL
In a solar thermal system the lower coil is connected to the solar heat source. Either primary coil connection may be utilized as
the supply or return. The solar tank sensor, supplied as part of the solar controls, inserts into the sensor well above the solar
coil.
The upper boiler coil will be connected to the boiler as per the manufacturers’ instructions. Ideally boiler thermostat should be
located in a sensor well above the coil position.
2.2.4 HOT WATER PIPEWORK
Run the first part of the hot water distribution pipework in ¾” . This can be reduced to the appropriate size for the type of faucet
etc. Your aim should be to reduce the volume of the hot draw-off pipework to a practical minimum so that the time taken for
the hot water is as quick as possible. Do not use monobloc mixer faucet or showers if the balanced cold connection is not
provided. Outlets of this type can back pressurize the unit and result in discharge.
The use and installation of an ASSE approved thermostatic mixing valve is required.
The suggested location for this valve may be seen in section 2.2 Figure 2.
2.2.5 TEMPERATURE AND PRESSURE RELIEF VALVE
The hot water tank must be installed with an appropriate temperature and pressure relief valve. The hot water tank has a
¾”NPT female connection to accommodate this apparatus in the top of the tank.
CAUTION: To reduce the risk of excessive pressures and temperatures in this water heater, install temperature and pressure
protective equipment required by local codes but no less than a combination pressure valve certified as meeting the
requirements for Relief Valves and Automatic Gas Shutoff devices for Hot Water Supply Systems ANSI Z21.22.
The T&P valve must be connected to a discharge pipe. This pipe must:
• Terminate a maximum 6” above a floor drain. In the rare event of a discharge the water will be very hot and may be
combination of water and steam, at pressure. Care must be taken to safely route the discharge pipe safely to drain.
• Be no smaller than ¾” diameter and must not be reduced in size.
• No other valve can be placed on the discharge line between the T&P valve and the discharge exit.
• The pipe must be capable of withstanding 250˚F.
• The pipe must be compiled of straight runs, direct to drain, to allow complete drainage of the valve and pipe assembly.
• The relief valve connections should not be used for any other purpose.
2.2.2 CONNECTING TO THE TANK
All of the water carrying pipe connections on the tank are ¾” NPT male. Suitable jointing compound that is suitable for potable
water and hot water should be used to provide a watertight seal.
2.2.3 COIL CONNECTIONS
The coil connections to the boiler or solar circuit are ¾” NPT male. Ensure good connections. Use commercially accepted
water inhibitors as stated by the manufacturer of the boiler or renewable energy system.
WARNING
The expansion tank is an important safety feature of the tank installation. It must be installed and properly sized. Refer to
Table.2 for Kingspan supplied sizes.
Volume
Minimum expansion tank size
58/60Gal
5Gal
80Gal
7Gal
119Gal
10Gal
Table.2
Expansion SIzing
