Extension Ea1 Accessory (Optional) - Viessmann VITOTRONIC300 Installation And Service Instructions Manual

Vitotronic 300, GW2B Installation and Service
Extension EA1 Accessory
Digital data inputs DE1 to DE3
Functions:
External heating program changeover,
separate for heating circuits 1 to 3
External blocking
External blocking with fault message input
External demand with minimum boiler water
temperature
Fault message input
Brief operation of the DHW recirculation pump
When connecting external contacts, observe the
requirements of safety category II, i.e. 8.0 mm air-gap
and creep path or maintain a 2.0 mm insulation thickness
against 'live' parts.
Input function assignment
Select the input functions by means of the following
codes in the "General" group at the boiler control unit:
DE1: Coding address "5D"
DE2: Coding address "5E"
DE3: Coding address "5F"
Assigning the heating program changeover
function to the heating circuits
The allocation of the heating program changeover to the
relevant heating circuit is selected via coding address
"D8" in the "Heating circuit..." group:
Code "D8:1": Changeover via input DE1
Code "D8:2": Changeover via input DE2
Code "D8:3": Changeover via input DE3
The effect of the heating program changeover is selected
via coding address "D5" in the "Heating circuit..." group.
(optional)
Duration of the heating program changeover
Contact constantly closed:
The changeover is active as long as the contact
is closed.
Contact only closed briefly via pushbutton:
The changeover is enabled for the time selected in
coding address "F2" in the "Heating circuit..." group.
DHW recirculation pump runtime for brief operation
The DHW recirculation pump can be started outside the
times when it is enabled according to the time program.
The DHW recirculation pump is started by closing the
contact at DE1, DE2 or DE3 by means of a pushbutton.
The runtime is adjusted via coding address "3D" in the
"General" group.
Analogue input 0–10V
The 0–10V hook-up provides an additional set boiler
water temperature:
0–1V Is taken as "no default for set boiler water
Note: Ensure DC separation between the LV output
Coding address "1E" in the "General" group:
"1E:0" ≙ temperature demand adjustable in the
range from 32 to 212°F (0 to 100°C) 1V ≙ 50°F
(10°C) set value change 10V ≙ 212°F (100°C)
set value change
"1E:1" ≙ temperature demand adjustable in the
range from 86 to 248°F (30 to 120°C) 1V ≙ 86°F
(30°C) set value change 10V ≙ 248°F (120°C)
set value change
Output aBJ
Connection of a central fault messaging facility or
signalling reduced mode (reduction of the heating
circuit pump speed).
Select the function of output aBJ via coding address
"5C" in the "General" group.
temperature".
and the earth conductor of the onsite voltage
source.
Refer to the EA1 module Installation Instructions
Components
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