Electrical Connections - Viessmann EM-EA1 Extension Installation And Service Instructions Manual

Connections
Overview of Electrical Connections
Function
External functions
External default set supply temperature
External default output
Operating mode changeover
External demand
External blocking
Fault message input and fault message output
Connection without system blocking
Connection with system blocking, 120V
Connection with system blocking, 24V
Connecting only message facility (e.g. buzzer)
External LPG valve
External extractor interlock

Electrical Connections

8
(continued)
Page Connections:
DI1 DI2 DI3
8 -- -- --
9 -- -- --
10 X X X
10 -- -- --
11 -- -- --
11 -- -- --
12 -- -- --
13 X -- --
13 -- -- --
13 -- -- --
13 -- -- --
Apply strain relief to on-site cables.
Seal any unnecessary apertures with cable grommets
(not cut open).
WARNING
Incorrect wiring can lead to serious injury from
electrical current and result in appliance damage.
Take the following measures to prevent wires drifting
into the adjacent voltage area:
Route low voltage leads away from 120V or other high
voltage cables.
Secure with cable ties.
Strip as little of the insulation as possible, directly
before the terminals. Bundle the cables close to the
corresponding terminals.
If 2 components are connected to the same terminal,
press both wires together in a single wire ferrule.
EM-EA1 Extension Installation / Service
PWM1 0-10V hH
IN OUT
-- X -- --
-- X -- --
-- -- -- --
-- -- -- --
-- -- -- --
-- -- -- X
-- -- -- X
-- -- -- X
-- -- -- X
-- -- -- --
-- -- -- X
CAUTION
The electronic modules are static
sensitive. To avoid damage caused by
static discharge, follow Electro-Static
Discharge safety procedures.
fD
43-1 43-L
X --
X --
-- --
X --
X --
X --
X --
-- --
-- --
-- X
-- --