Aegis Sequencer
User Interface
L-OMM-015_0B
• 8/8/2023 Technical Support • (800) 433-5654 • Mon-Fri, 8 am - 5 pm EST
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of
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2. Phase 2
•
When the Phase 1 Set BTL set point is reached, the units will switch off (compressor OFF),
while the secondary pump is brought to a fixed speed. Once the BTL probe reaches the
Phase 2 Set BTL (e.g. 158
°
F [70
°
C], the secondary pump also switches off.
•
The anti-Legionella cycle is finished once this condition lasts for a settable time frame
(default 60 seconds).
•
The maximum allowable duration of the anti-Legionella cycle is set to a default of [2 min],
after which the unit exits the cycle and returns to normal operation. This generates a
warning that the anti-Legionella cycle was not completed correctly.
•
The unit defrost function has priority over the Aegis Sequencer anti-Legionella management.
Sections 4.2.2. and 4.3.3. contain more information on anti-Legionella.
4.2.3. Secondary Pump Management
The secondary pump management allows coordinated operation between the primary pumps installed
inside the units or on the primary loop and those on the domestic (secondary) side between the
intermediate exchanger and the storage tanks. The coordinated operation of pumps is necessary to
ensure the correct delivery temperature of the water to the tank system. The secondary pump could
have a different flow than what
’s installed on the unit, and must be managed independently by an
additional temperature probe, positioned downstream of the intermediate exchanger
(see 5.2.3 for
information on the settings)
.
Aegis heat pump water heaters are supplied with an engineered heat exchanger module, sized for an
individual heat pump. While the Aegis sequencer can support a single, shared heat exchanger and
pump, Lync strongly recommends using individual heat exchangers and pumps for multiple unit
applications.
Please note that the speed regulation of the domestic side pump is independent from the speed
regulation of the primary pump.
The function is based on the following:
•
proportional-integral-derivative control, which has as an input value
•
the temperature value read by the BT3 probe
•
its position at the exchanger outlet
•
two temperature setpoints:
o
Unit delivery setpoint
o
Anti-Legionella setpoint (if the function is active)
An additional fixed speed set point is needed for the anti-Legionella Phase 2.
See 5.2.2 for more information on Thermoregulation.
