Dhw; Solar - Viessmann Vitocrossal 300 Series Service Instructions Manual

Vitocrossal 300 CU3A 26 to 199 Service

DHW

Coding in the factory setting
Enable DHW recirculation pump
67:40
73:0

Solar

Note: The solar group is only displayed if a solar control module, type SM1, is connected.
Coding in the factory setting
Speed control solar circuit pump
02:0
DHW tank maximum temperature
08:60
Stagnation time reduction
0A:5
Flow rate solar circuit
0F:70
Extended solar control functions
20:0
For solar DHW heating:
Set DHW temperature
104°F (40°C). Reheating is
suppressed above the selected
set temperature.
DHW recirculation pump: "ON"
in accordance with the time
program
Solar circuit pump is not
speed-controlled.
The solar circuit pump is
switched off when the actual
DHW tank temperature
reaches 140°F (60°C)
(maximum DHW tank temp).
To protect the system
components and heat
transfer medium, the speed
of the solar circuit pump is
reduced when the differential
between the actual DHW tank
temperature and the set DHW
tank temperature is less than
5 K.
Solar circuit flow rate at
the maximum pump speed
1.86 GPM (7 L/minute)
No extended control
function enabled.
Possible change
67:0 Set DHW temperature adjustable from
to 32°F to 203°F (0°C to 95°C) (limited
67:95 by boiler-specific parameters)
73:1 "ON" from once per hour for 5 minutes
to up to 6 times per hour for 5 minutes
73:6 during the time program.
73:7 Constantly "ON".
Possible change
02:1 Solar circuit pump is speed-controlled
with wave packet control.
02:2 Solar circuit pump is speed-controlled
with PWM control.
08:10 Set DHW temperature adjustable from
to 50°F to 194°F (10°C to 90°C).
08:90
0A:0 Stagnation time reduction disabled.
0A:1 Temperature differential adjustable from
to 1 to 40 K.
0A:40
0F:1 Flow rate adjustable from
to 0.02 to 6.7 GPM (0.1 to 25.5 L/minute;)
0F:255 0.02 GPM (1 step K 0.1 L/minute.)
20:1 Additional function for DHW heating.
20:2 Differential temperature control 2.
20:3 Differential temperature control 2 and
auxiliary function.
20:4 Differential temperature control 2 for
central heating backup.
20:5 Thermostat function.
20:6 Thermostat function and auxiliary function.
20:7 Solar heating via external heat exchanger
without additional temperature sensor.
20:8 Solar heating via external heat exchanger
with additional temperature sensor.
20:9 Solar heating of two DHW tanks.
Coding 1
57