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9. Once the pump (6) ceases operation the system commences to drain back. Fluid in the
collectors (8) begins to fall back to the bottom of the heat exchanger (9) via the cold
pipe (10) due to gravity; this creates suction on the fluid in the hot pipe (12) which is
also drawn back through the collectors (8).
At the same time the heated vapour in the heat exchanger (9) is rising up through the
distributor (11) and into the hot pipe (12) also forcing the fluid back through the
collectors (8). At the end of the process all the heating fluid is stored in the central heat
exchanger (9) leaving the collectors (8) and connecting pipe work empty of heating fluid.
Sequence of Operation Component Diagram
Electric Booster Operation - 591 Models
Electric boosted models are fitted with either a 2.4kW, 3.6kW or 4.8kW electric immersion
type heating element depending upon model (refer to water heater model identification
table on page 3). The element will heat the volume of water in the storage cylinder directly
above the level of the element providing a 125 litre boost capacity.
Electric boosted models are fitted with a Robertshaw mechanical thermostat set at 60ºC.
This thermostat controls the electric boost element only. The electric boost circuit operates
simultaneously with the solar system and will heat the 125 litre boost volume to 60ºC
regardless of whether the solar circuit is heating or not. Simultaneous operation can be
prevented by the installation of a switch in the electric booster circuit.
The element & mechanical thermostat are located behind the top electrical access cover.
Gas Booster Operation - 596 Models
Gas boosted models have an integral in-line gas booster (Integrity 26 electronic gas
instantaneous water heater) mounted externally on the jacket of the heater. The in-line gas
booster will only operate provided the flow is greater than 3 litres per minute and the inlet
water temperature to the booster is less than or equal to 58ºC.
Gas boosted models have additional integrated plumbing connections which are located
behind the front access cover (refer to 'Gas Boosted Integrated Plumbing Arrangement' on
page 11).
Two hot water outlets are available on gas boosted models; a tempered water outlet (50ºC
max) and an optional hot water outlet (65 - 75ºC). Gas boosted models do not require an
external tempering valve to comply with AS3500.4 Clause 1.9.2(b) provided the tempered
water plumbing is connected to the tempered water outlet. The tempered water outlet from
this water heater will not deliver temperatures exceeding 50°C in accordance with
AS 4032.2. For more information refer to 'Tempering Valves' on page 14.
TM024 Premier Loline Solar Drain back Service Instructions REV: A
D.O.I: 12/12/2007
This document is stored and maintained electronically by
10
Service. All printed copies not bearing this statement in RED are deemed "uncontrolled"
1
Controller
2
Sensor Strip
3
Hot Sensor
4
Cold Sensor
5
Pump Relay
6
Pump
7
Cylinder
8
Collector(s)
9
Heat Exchanger
10 Cold Pipe
11 Distributer
12 Hot Pipe (not
shown)
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