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Solahart Owner’s Manual – Thermosiphon Systems - Revision 3
3
Period of Reduced Usage or Holidays
If the water heater is left unused for two weeks or more, flammable hydrogen gas may accumulate in the water cylinder.
To dissipate hydrogen gas safely, it is recommended that a sink hot tap be turned on for several minutes. Do not use a
dishwasher, clothes washer or other appliance for this purpose. During this procedure there must be no smoking, open flames
or any electrical appliance operating nearby. If hydrogen is discharged through the tap it will make an unusual sound like air
escaping.
Unvented and Vented Systems
The Solahart thermosiphon solar water heater can be installed to operate as an Unvented System or a Vented System.
UNVENTED SYSTEMS
An unvented system requires an approved Temperature Pressure Relief (TPR) Valve connected to the pressure relief port of
the tank. These systems can operate either with a mains pressure water supply or a gravity fed water supply.
VENTED SYSTEMS
When cold water to the tank is fed under gravity from a header tank, the solar water heater can be set up as a vented system.
A vented system uses a Vent Pipe connected to the pressure relief port of the solar tank to allow safe expansion of water at
elevated temperatures instead of a TPR valve. A Vent Pipe cannot be used with a mains pressure water supply. A TPR valve
must be used instead (refer to unvented systems). For vent pipe details refer to Page 22.
Specifications
Storage Tank
Models
150RD18
150RD00
Storage Capacity
150 litres
Dimensions
Length 1.4m; Diameter 461mm
Weight
Empty tank 50kg; Tank Filled with Water 200kg
Inner construction
Low carbon steel with vitreous enamel lining
Anode
Magenesium with steel core
Water and Pressure
Relief Port connetcions
Rp 3/4
Maximum Water
Supply Pressure
800 kPa (appliacable only when installed as an unvented
system with a TPR valve)
TPR valve setting
1,000 kPa/99
0
C (Optional)
Heating Unit type
Immersion element with
combination thermostat/safety
cut-out
-
Supply Voltage
220 – 240 VAC, 50 – 60Hz
-
Rated Power
1.8 kW
-
Collector
Model
BPT20007
Aperture
1.87m
2
Dimensions
1.940m x 1.024m x 0.08m
Weight
40kg
Absorber
Painted Aluminium
Risers
Copper
Tray
0.45mm thick Prepainted steel
Insulation
38mm polyester blanket
Glass
3.2mm tempered low iron
