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Viessmann VITOTRONIC 300-K Operations Instructions Page 38

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Vitotronic 200 and 300-K Installation and Service
5693 976 - 04
38
“Cascade” Group
Coding
Coding in the factory set condition Possible change
Number of boilers in cascade
35:4 4 boilers connected to the Vitotronic 300-K 35:1
to
35:8
1 to 8 boilers connected to the Vitotronic 300-K
Min. system supply temperature
36:0 Electronic minimum system supply
temperature limit set to 32°F (0°C)
36:1
to
36:127
Electronic minimum system supply temperature
limit adjustable from 32 to 260°F
(0 to 127°C)
Max. system supply temperature
37:80 Electronic maximum system supply
temperature limit set to 176°F (80°C)
37:20
to
37:127
Electronic maximum system supply temperature
limit adjustable from 68 to 260°F
(20 to 127°C)
Control type
3B:1 Stand-alone parallel boiler connection with
supply temperature sensor
3B:0 Stand-alone parallel boiler connection without
supply temperature sensor
Control strategy
3C:0 Condensing strategy (see page 81) 3C:1 Conventional boiler strategy 1 (see page 81)
3C:2 Conventional boiler strategy 2 (see page 81)
Coding
Coding in the factory set condition Possible change
Set DHW temperature reheating suppression
67:40 For solar DHW heating:
Set DHW temperature 104°F (40°C).
Reheating is suppressed above the selected
set temperature (DHW heating blocked by the
boiler).
67:0
to
67:95
Set DHW temperature adjustable from 32 to
203°F (0 to 95°C)
(limited by boiler-specific parameters)
Enable DHW recirculation pump
73:0 DHW recirculation pump: “ON” according to
time program
73:1
to
73:6
“ON” from once per hour for 5 min. up to
6 times per hour for 5 min. during the time
program
73:7 Constantly “ON”
“DHW” Group
Coding 1 Vitotronic 300-K
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