Connecting The Operating Mode Changeover: Di1 To Di3; Connecting External Demand: Fd - Viessmann EM-EA1 extension Installation And Service Instructions Manual

Installation sequence
Connecting external functions

Connecting the operating mode changeover: DI1 to DI3

jF jF
[{] DI1 DI2 DI3 [{] [{]
1 2 3 4 1 2 3 4 5 6
Fig. 5
External contacts at DI1, DI2 and DI3 must be poten-
■
tial-free.
■ When making the connection, adhere to the require-
ments of protection class II. That is 5.0 mm air and
creep paths and 2.0 mm insulation thickness against
'live' components.
Weather-compensated operation
As soon as the contact closes, the following demand
becomes active:
■ Demand for all installed heating circuits simultane-
ously, with the respective programmed set room tem-
perature of the individual heating circuit:
DI1 Reduced room temperature
DI2 Standard room temperature
DI3 Comfort temperature
Connecting external demand:
fD f-] fÖ
A
1
? ? ?
A B
Fig. 6
Signal for external demand or external blocking
A
Junction box
B
10
(cont.)
Continuous operation or room temperature-
dependent operation
As soon as the contact closes, the following demands
become active:
■ Set flow temperature demand for the system
Demand for all installed heating circuits simultane-
■
ously, at the respective programmed temperature
level of the individual heating circuit:
DI1 Reduced flow temperature
DI2 Standard flow temperature
DI3 Comfort flow temperature
fD
The demand is active if 230 V voltage is present at dig-
ital input 43-1. A demand is issued to the heat genera-
tor.
The set values for the flow temperature and the speed
of the primary pump are specified with parameters
528.0 and 1100.2.
(Only with continuous operation)