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2-1 HOT WATER TEMPERATURE
2-1.1 Hot Water Control - Heating System (Indirect only)
When the hot water is heated by the heating system the temperature of the hot water at the taps is controlled by the Cylinder Thermostat.
This controls a Motorised Valve that opens and closes the flow from the heating system.
The temperature range is 45°C to 75°C.
Recommended setting is between 50°C minimum and 70°C maximum.
1 Indirect Units
Motorised valve
To comply with regulations governing the installation of indirect unvented
cylinders, a motorised valve must be fitted in the primary flow. Your OSO unit has
been supplied with a two port motorised valve, which will act as a positive energy
cut-out should the safety cut-out operate. The motorised valve will also control the
temperature of the domestic stored water via the cylinder thermostat, which is
located in the electrical box. The unit should be installed on an "S'' or "Y'' plan
system. Please follow the instructions carefully. All electrical connections must
conform to current IEE wiring regulations. The working thermostat which controls
the temperature of the domestic hot water (see fig. 2) is adjustable between 45°C
to 75°C. A safety cut out is also incorporated within the thermostat and will
operate at 85°C ± 3°C. Should the safety cut out be brought into operation, the
motorised valve will operate and close down the primary flow to the cylinder. To
reset the safety cut out and the motorised valve the reset button must be pressed
in (see fig. 2). If using a 6-wire 28mm or 1'' BSP V4043H on either circuit the white
wire is not needed and must be made electrically safe.
2-1.2 Hot Water Control - Immersion Heater
When the hot water is heated by the electric Immersion Heater, the temperature
of the hot water at the taps is controlled by the Immersion Heater Thermostat.
This is located under the electrical box cover, left hand thermostat.
2 Direct units
Wiring instructions for the water heaters are located on the reverse side of the lid.
Follow the wiring instructions connecting the live, neutral and earth as
indicated. All internal wiring is factory mounted. Each immersion heater has
a working thermostat adjustable between 45°C to 75°C. A safety cut-out is
also incorporated within the thermostat and will operate at 85°C ± 3°C.
Should this happen, press the reset button.
Important: Before resetting the safety cut-out or altering the thermostat
setting, isolate electrical supply to the unit prior to removal of the lid.
Ensure the lid to the electrical box is replaced correctly and the
retaining screw is fitted.
The lower immersion heater should be connected to the off peak supply
(if available) whilst the top immersion heater can be connected to the day
tariff. The immersion heater can be connected to the mains supply through a
water heater controller (Contact your local electricity company if in doubt).
WARNING: When the cover is removed electrical live terminals are
exposed.
ALWAYS TURN OFF THE 'WATER HEATER' SWITCH BEFORE
REMOVING COVER.
The temperature range is 45°C to 75°C.
Recommended setting is between 50°C minimum and 70°C maximum.
The electrical connection to the immersion heater must conform to
current IEE wiring regulations. The unit must be permanently connected
to the electrical supply through a double-pole linked switch with a
minimum break capacity of 13 amps.
OPERATOR CONTROLS 2
L
4
Return to Boiler
Motorised valve
Flow from Boiler
Fig. 2-1a Hot Water Control
N
Adjustment
Screw
Fig. 2-1b Immersion Heater Thermostat
Pole Switch
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