Technical data

20
GEMINI HSC
19.0 use of electric
immersion heater
1. Ensure that the electrical connections have been correctly made and that the supply is of adequate
rating and adequate fuse protection.
2. Ensure that the secondary and primary systems have been filled correctly, see section 16.
Note: Failure to fill the primary side (outer tank) will result in “burn out” of the
immersion heater element as it is located in the primary water space.
3. Set the control thermostat to the required setting.
4. Set the summer/winter switch to the summer position.
5. Turn on external electricity supply isolator.
18.0 optional
immersion heaters
20.0 draining
the calorifier
Each Gemini HSC Calorifier can be fitted with an optional immersion heater. The heater element is
installed into the primary tank underneath the domestic stainless steel vessel. This ensures thorough heat-
up of the domestic water and avoids scale build up on the element. The immersion heater will provide a
nominal supply of hot water during boiler shutdown.
Model
60 - i
100 - i
150 - i
200 - i
300 - i
500 - i
Immersion Heater
Rating kW
1.5
2.2
2.2
2.5
2.5
2.5
Recovery Time
∆t 50°C
3.0 hrs
3.5 hrs
5.2 hrs
6.0 hrs
8.7 hrs
14.0 hrs
If it is required to drain the secondary (domestic) water from the calorifier then
the following procedure must be followed to avoid damage to the unit.
1. Isolate and drain the primary side ensuring the manual primary air vent (located adjacent to the primary
flow in connection) is opened whilst draining.
2. Isolate the domestic cold feed and open the hot draw off to atmosphere.
3. Open the low level drain leg drain cock (by installer) and the inner tank will self siphon drain.
4. For refilling, close drain cocks and vents etc and follow procedure in section 16.