Cascade" Group; Dhw" Group - Viessmann VITOTRONIC 300 Installation And Service Instructions Manual

Vitotronic 300, GW5B & MW1B Installation and Service

"Cascade" Group

Coding
Coding in the factory set condition
Number of boilers in cascade
35:4 4 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).
Max. system supply temperature
37:80 Electronic maximum system supply
temperature limit set to 176° F (80° C).
Control type
3B:1 Stand-alone parallel boiler circuit with
supply temperature sensor
(see page 62).
Control strategy
3C:2 Conventional strategy 2 (see page 64).

"DHW" Group

Coding
Coding in the factory set condition
DHW
67:40 For solar DHW heating:
Set DHW temperature 104° F (40° C).
Reheating is suppressed above the selected
set temperature (DHW heating by the boiler
only if solar energy is not sufficient).
Enable DHW circulation pump
73:0 DHW circulation pump:
"ON" according to time program.
Possible change
35:1 1 to 4 boilers connected to the
to Vitotronic 300-K.
35:4
36:1 Minimum limit adjustable from 32 to
to 260° F (0 to 127° C).
36:127
37:20 Maximum limit adjustable from 68 to
to 260° F (20 to 127° C).
37:127
Note: Value must not be higher than the
lowest value of coding address
"06" in the "Boiler" group of
every Vitotronic 300, GW5B.
3B:0 Stand-alone parallel boiler circuit without
supply temperature sensor (see page 62).
3B:2 Stand-alone serial boiler circuit without
supply temperature sensor (see page 62).
3B:3 Stand-alone serial boiler circuit with supply
temperature sensor (see page 62).
3B:4 Sequential control with supply
temperature sensor (see page 62).
3C:0 Condensing strategy (see page 63).
3C:1 Conventional strategy 1 (see page 64).
Possible change
67:0 No third set value.
67:10 Set DHW temperature adjustable from 50
to to 203° F (10 to 95° C) (limited by boiler
67:95 specific parameters).
Observe the setting of coding address "56".
73:1 "ON" from once per hour for 5 min up to
to 6 times per hour for 5 min. during the time
73:6 program.
73:7 Constantly "ON".
Code 1, Vitotronic 300-K
81