Connecting External Sensors, Control Units; (Accessories); Start-Up; Filling The Installation - Vaillant atmoCRAFT VK 654/9 Installations- Und Wartungsanleitung

5.4.6 Connecting external sensors, control units

(accessories)

Fig. 5.5 Connecting the sensors
• Push the sensor for water storage tank onto the plug
(white plug) on the sensor wiring harness.
• Connect the outer sensor to the edge plug X8 (when
using a VRC 410 or 420).
• Connect the water shortage safety device or GDW
potential-free to the "installation thermostat" (Pro E)
and the exhaust gas diverter to the accessories.
Fig. 5.6 Connecting controller to 7-8-9
Installation and maintenance manual atmoCRAFT
Connectable accessories with Pro E system
Information concerning the electrical connection of the
following accessories can be taken from the individual
accessories instructions:
– Hot water storage tank
– Heating pump for the pipe groups
- Controllers
6
Initial start-up and operation of the appliance, and
instruction for the user, must be performed by a heating
engineer.
For subsequent start-up/operation, see section 4.3 of the
operating manual.
6.1
6.1.1
Requirements for the quality of the filling and top-up
water in accordance with VDI-2035:
Heat generators with output up to 100 kW:
Water having a carbon hardness of up to 3.0 mol/m
(16.8° dH) can be used for filling.
In the case of hard water, to avoid the build-up of
deposits, hardness complexing or softening must be
performed (see VDI 2035; Section 8.1.1 and 8.1.2 (only in
Germany)).
Heating water (circulating water):
In the case of open heating systems with two safety
lines, in which the heating water circulates through the
expansion vessel, one must add oxygen-binding
L N
230V
substances (VDI 2035, Section 8.2.2 for the German
market and Ö-Standard H 5195), whereby an adequate
excess in the return line is ensured by regular
monitoring.
In the case of all other installations of this group
measures for monitoring the composition of the heating
water are not required.
7 8 9
RT 24V

Start-up

Caution!
Before start-up, and after inspection,
maintenance and repair work, the gas unit must
be checked for leaks!

Filling the installation

Water preparation in heating installations

Caution!
In order to avoid operating faults caused by
calcium deposits, on open installations in
accordance with DIN 4751, Sheet 1 and in the
case of a total hardness of the filling and top-up
water in excess of 3 mol/m
softening is to be recommended. The
corresponding instructions for use provided by
the individual manufacturers of these softening
agents are to be observed.
Installation 5
Start-up 6
3
3
(16.8° dH), water
GB 25