Specifications

4
ABOUT YOUR WATER HEATER
WATER HEATER APPLICATION
This water heater is designed for use in a single family domestic dwelling for the purpose of heating potable
water. Its use in an application other than this may shorten its life.
MODEL TYPE
Your Vulcan
®
indirect solar VSi water heater is designed for the solar collector to be roof mounted and the
solar storage tank to be installed at ground or floor level. The solar storage tank is suitable for installation
either indoor or outdoor and with either one only Rheem T200 or two only Rheem NPT200 or HBT200 solar
collectors. The system is suitable for installation in areas subject to frost or freeze conditions. Freeze
conditions occur below 6°C.
This solar water heater is designed to be installed with either a Vulcan
continuous flow 244 620 in-series gas booster mounted onto the storage tank
or a Vulcan continuous flow 244 627 in-series gas booster installed remotely.
If a 620 model in-series gas booster is mounted onto the storage tank, then it
is suitable for outdoor installation only. A 627 model in-series gas booster
cannot be mounted on the solar storage tank.
The solar water heater may be installed with another suitable type of remotely
installed in-series continuous flow or storage booster. If the in-series water
heater is other than a Vulcan continuous flow 244 620 or 244 627 in-series
gas booster, then the references to the in-series gas booster in this guide may
not be applicable to the installation. For information relating to the function
and operation of the in-series water heater, refer to the Owners Guide and
Installation Instructions supplied with the water heater.
SOLAR OPERATION
The Vulcan indirect solar VSi water heater has its vitreous enamel lined solar
storage tank installed at ground or floor level, remotely from the solar
collector. This water heater is an indirect solar hot water system with a heat
exchanger in the solar storage tank.
The heat exchanger is filled with closed circuit fluid and is connected to the
solar collector by insulated copper pipe work forming a closed circuit. The
closed circuit fluid is a solution of a blue, non-toxic food grade propylene
glycol concentrate mixed with water. The closed circuit concentrate is used to
lower the freezing temperature of the closed circuit fluid and provides
protection against freezing.
As the sun heats the solar collector, the increase in temperature activates the
pump. The pump switches on whenever the solar collector is hotter than the
water in the tank and the water requires heating. The pump moves the closed
circuit fluid from the solar storage tank heat exchanger through an insulated
copper pipe to the solar collector to be heated by the sun‟s energy and then
back to the heat exchanger. Heat transfers from the closed circuit fluid in the
heat exchanger to the water stored in the solar storage tank.
This process continues while solar energy is available and until the water in the solar storage tank reaches a
temperature of approximately 75°C. The pump is then deactivated and the closed circuit fluid in the solar
collector and solar pipe work drains back into the heat exchanger in the solar storage tank.
The closed circuit provides protection to the solar collector and solar circuit in harsh water areas. The drain
back principle provides protection to the system in freezing conditions.
Automatic safety controls are fitted to the water heater to provide safe and efficient operation.