System Example 1 - Viessmann SM1 Installation And Service Instructions Manual

Connections

System Example 1

DHW heating with dual mode DHW tank
Function description
DHW heating with solar energy
If the temperature differential between collector
temperature sensor eQ and DHW tank temperature sensor
qQ is greater than the start temperature differential
(coding address 00), solar circuit pump eE is started and
DHW tank qP is heated.
Solar circuit pump eE stops if:
H Actual temperature drops below stop temperature
differential (coding address 01)
H Maximum DHW tank temperature is exceeded (coding
address 08)
H The temperature selected at high limit safety cut-out qW
(if installed) is reached
Additional function for DHW heating
The requirements for the additional function are achieved
through circulation pump qT.
Function/system components
Start temperature differential for solar circuit pump at connection sF
Factory set condition 8 K (14.4° F)
Stop temperature differential for solar circuit pump at connection sF
Factory set condition 4 K (7.2° F)
Solar circuit pump type:
H Solar circuit pump is not speed-controlled
H Solar circuit pump is speed-controlled with wave pack control
H Solar circuit pump is speed-controlled with PWM control
Maximum DHW tank temperature (Factory set condition 140 F) 60° C)
Additional DHW heating function:
H Without additional function for DHW heating
H With additional function for DHW heating
Note: Coding address 00 can be set to min. 0.9° F (0.5 K)
above coding address 01.
Coding address 01 can be set to max. 0.9° F (0.5 K)
below coding address 00.
8
Solar Control Module SM1, Installation and Service
Suppression of DHW tank reheating by the boiler
Reheating suppression takes place in two stages.
Required codes at the oil/gas boiler control unit
Boiler installation and service instructions
Reheating of DHW tank qP by boiler 1 is suppressed
as soon as DHW tank qP is heated by collectors eP.
For this, the set DHW tank temperature for reheating
is reduced by boiler 1. After solar circuit pump eE
has been switched off, suppression remains active
for a certain time.
In the case of uninterrupted heating by the collectors eP
(> 2 h), boiler 1 will only reheat if the set DHW
temperature selected at boiler control unit 2 (coding
address "67") is not achieved.
A third set DHW temperature can be specified via coding
address "67" [setting range 50 to 203° F (10 to 95° C)].
This value must be below the first set DHW temperature.
DHW tank qP will only be heated by boiler 1 if this set
value cannot be achieved by the solar thermal system.
DHW heating without solar energy
The upper section of DHW tank qP is heated by
boiler 1. The DHW tank thermostat with DHW tank
temperature sensor qZ of boiler control unit 2 regulates
DHW tank heating.
Adjust
00:...
01:...
--
02:1
02:2
08:...
--
20:1
Code in solar group
Factory set
condition
00:8
01:4
02:0
02:0
02:0
08:60
20:0
20:0