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Sequence of Operation - Solar
The following sequence of operation is common to 590, 591 & 596 models and pertains to
the solar circuit which is a 'closed circuit' containing a heating fluid consisting of propylene
glycol and water. For information on electric and gas booster operation refer to page 10.
Refer to 'Sequence of Operation Component Diagram' on page 10 to view components
shown in brackets e.g. (1).
1. When power is supplied to the appliance the controller (1) performs a self check routine.
If the software, sensor strip (2), hot sensor (3) and cold sensor (4) are all functional the
control board will energise the pump relay (5). The pump relay (5) supplies power to the
control boards internal pump switch. If any of the aforementioned components are faulty
the pump relay will not be energised preventing pump (6) operation.
2. The cylinder (7) temperature is monitored by a sensor strip (2) containing 6 thermistors
spaced at equal intervals along the strip. The sensor strip (2) is attached to the outer
cylinder wall. The water temperature is derived by averaging the readings from the top 3
sensors.
3. As the vapour in the collector(s) (8) gains heat from solar radiation a sensor mounted in
the collector (hot sensor) (3) senses the temperature increase.
4. The controller (1) will turn the pump (6) on when the temperature in the collector(s) is
greater than or equal to 12°C above the average cylinder top temperature provided the
cylinder top temperature is less than or equal to 75°C.
5. Heating fluid consisting of propylene glycol and water is pumped from the central heat
exchanger (9) up to the collector(s) via the cold pipe (10).
6. The fluid gains heat as it passes through the collectors (8) and returns to the top of the
heat exchanger (9) where it passes through a distributor (11) which forces the fluid to
run down the heat exchanger (9) walls in a film ('falling film'). The heating fluid gives off
its heat through the heat exchanger (9) wall to the water in the cylinder (7).
7. 15 seconds after the pump (6) commences operation the controller (1) limits the pump
(6) speed to ensure the temperature rise of the fluid across the collector(s) (8) is limited
to 10°C to prevent unnecessary cycling of the pump (6) and draining of the system.
8. The pump (6) is turned off when:
• The Temperature rise across the collector(s) (8) (i.e. difference between the hot
sensor (3) and cold sensor (4)) is less than 4°C, or:
• The average cylinder (7) top temperature is greater than 75°C, or:
• The temperature of the heating fluid leaving the heat exchanger (9) is greater than
75°C (detected by cold sensor (4)), or:
• The temperature of the heating fluid leaving the collector(s) (8) is greater than 95°C
(detected by hot sensor (3)), or:
• The collector (8) temperature is less than 20°C (detected by hot sensor (3)), or:
• The temperature of the heating fluid leaving the collector(s) (8) (detected by hot
sensor (3)) is less than 5°C above the average cylinder (7) top temperature
(detected by sensor strip (2)).
TM024 Premier Loline Solar Drain back Service Instructions REV: A
D.O.I: 12/12/2007
This document is stored and maintained electronically by
9
Service. All printed copies not bearing this statement in RED are deemed "uncontrolled"
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