30
Installation – Solar controls
- Heating by a solar thermal primary heating circuit must be controlled by a proprietary solar differential temperature
controller. Connection to the controller should be in accordance with the manufacturers instructions.
- The water heater temperature sensing probe (supplied with the solar controller) should be fully inserted into the
pocket located within the lower terminal housing.
-
This appliance must be earthed
- All electrical wiring should be carried out by a competent electrician and be in accordance with the latest national
Wiring Regulations. Electrical circuits must be protected by a suitable fuse and double pole isolating switch with a
contact separation of at least 3mm in both poles.
-
Disconnect the mains electrical supply before working on any circuits or opening any covers.
- If the optional electric immersion heater is fitted refer to the section “FITTING THE OPTIONAL IMMERSION
HEATER” for electrical requirements specific to this item.
- The unit can be fitted with an optional immersion heater complete with thermostatic control and over-temperature
cut-out. The immersion heater is rated 1.8kW at 230V ~ single phase.
- To fit the immersion heater the blanking plate will first need to be removed. If the unit has previously been filled with
water it must first be completely emptied before removing the blanking plate. Switch off any heat source connected
to the water heater before commencing draining. Turn off the water supply to the unit.
- Open a hot tap served by the unit to relieve any system pressure. Empty the unit by opening the drain valve in the
inlet pipework.
- Remove the middle Terminal Housing cover.
- Unscrew the brass backnut securing the blanking plate using the key spanner provided. Remove the blanking plate.
- Insert the immersion heater into the boss ensuring the element hangs vertically downwards towards the base of the
unit. Ensure that the sealing gasket is correctly fitted and is not displaced when inserting.
- It may be helpful to support the immersion heater using a round bladed screwdriver inserted into the thermostat
pocket. Hand tighten the brass backnut.
- Secure the immersion heater in position by tightening with the key spanner provided.
- Insert the thermostat stem into the thermostat pocket and ensure that the male terminations on the underside of the
thermostat head align with the female terminations on the element tails. Carefully push the thermostat onto the
terminations until fully located.
- The immersion heater should be wired in accordance with Diagram 5. The supply cable must be routed through the
cable grip provided and the outer sheath of the cable firmly secured by tightening the screw on the cable grip.
Always replace the cover before operating.
- DO NOT operate the immersion heater until the water heater has been filled with water.
- It is recommended that the immersion heater thermostat is set to between position 4 and 5 (60 to 65ºC), however it
can be set between 1 and 5 (10º and 70ºC).
- The thermostat incorporates an over-temperature thermal cut-out that will switch off the immersion heater in the
event of a thermostat failure. The thermal cut-out reset button is indicated on Diagram 5. DO NOT bypass the
thermal cut-out in any circumstances.
- The immersion heater MUST be earthed.
FITTING THE OPTIONAL IMMERSION HEATER
ELECTRICAL REQUIREMENTS
307625_Baxi_Install Guide_AW:Dual cover follow on
1/12/10 14:43 Page 30
