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Monobloc Outdoor Unit
[4] The system will stop producing DHW and the system will change back to heating mode when:
DHW_TT ≥ DHW_CTRLP [P406] - ∆T DHW Stop [P722]
OR
The DHW maximum runtime [ P707] has elapsed
OR
The DHW exception timer [P708] has elapsed
[5] If there is DHW demand and the DHW Exception timer is OFF (timed out) then the system will continue to run
in heating mode. The system will only change to DHW mode if a second input pulse is received for the DHW
Priority function
Related Parameters for DHW Priority control:
Par.No
209*
406
502~508**
707***
708
711
712
713
721
722
* [P209] shows the status of the DHW exception timer (real time)
** Parameter required depends on DI selected. For example if DI#05 is used for the DHW Priority function
then [P502] needs to be set to 6
*** If [P707] = -1 then the DHW maximum runtime is ignored
8.2.9.
Anti-Legionella Control
The water inside the domestic water tank must be constantly controlled in order to minimize the risk of any
contamination, including legionella bacteria. Legionella belongs to a group of bacteria that is likely to grow in the water
system if proper measures are not taken.
The system can be scheduled to heat up water in the domestic hot water tank in order to eliminate the possibility of
legionella growth or kill the existing bacteria.
To reduce the risk of Legionella bacteria growth water should be stored at 50°C or higher.
Anti-Legionella ON:
The anti-legionella control will switch ON
The anti-bacteria control cycle can be enabled by two different methods:
i)
Manual Operation
Manual operation of the anti-bacteria is achieved by configuring one of the custom DI's to "anti-legionella cycle
request switch".
Set the relevant software parameter ([P502] ~ [P505]), depending on the DI selected for the anti-legionella cycle
(if DI_02 was used then P503 =)
When the status of the selected DI changes from OPEN to CLOSE. The DHW production control will be enabled
with the required anti-legionella set-point [P405].
Anti-Legionella OFF:
The anti-legionella control will switch OFF when:
•
DHW_TT > leg_stp [P405] - ∆T DHW Stop [P722]
OR
•
6 hour internal timer has elapsed
ii)
Automatic Operation
The anti-legionella control cycle can also be operated automatically using the anti-legionella schedule function:
Description
DHW exception timer – (DHW_EXCP): (min)
DHW setpoint – (dhw_stp): (°C)
Customer switch (DI) configuration
DHW max. runtime – (dhw_max): (min)
DHW exception time – (dhw_excp): (hr)
DHW schedule days – (dhw_dow): (-)
DHW start time – (dhw_strt): (hr:min)
DHW stop time – (dhw_stop): (hr:min)
DHW tank ∆T (start) – (dhw_dt): (K)
DHW tank ∆T (stop) – (dhw_dts): (K)
Range
0 ~ 1440
30.0 ~ 60.0
0 ~ 8
-1 (or 30)~720
1 ~ 24
0000 0000
1111 1111
00:00 ~ 23:59
00:00 ~ 23:59
2.0 ~ 10.0
0.0 ~ 5.0
43
Service Manual
Default
-
50.0
0
60
2
1111 1110
21:00
06:00
5.0
0.0
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