Viessmann AWO-M-AC 101.A06, Assembly And Servicing Instructions

Page: 18 / 52

18
6020930
5.5.3 Mod. Vitocal 100-A 14 / 16
1) Remove the cover by undoing the screws (number 1; 2; 3; 4; 5; 6; 7; 8;9).
2) Undo the screws (number 10; 11) of the front sheet and then push the panel downwards to remove
the tabs (Detail A); pull the panel forward to remove it.
3) Undo the screw (number 12) and those on the coil side of the unit. To remove the side panel, pull it
upwards (to free the tab at the base indicated as C in detail B) and remove it.
5.6 PLUMBING CONNECTIONS
The plumbing connections must be made in accordance with national and/or local regulations; pipes can be
made of steel, galvanised steel or PVC. Pipes must be accurately sized according to the nominal water flow
rate of the unit and the pressure drops of the water circuit. All pipes must be insulated with closed-cell
material of adequate thickness. The chiller must be connected to the pipes using new flexible joints, not
reused ones. The water circuit should include the following components:

Well thermometers to monitor the circuit’s temperature.

Manual gate valves to isolate the chiller from the water circuit.

Metal Y filter and dirt separator (installed on the return pipe) with metal mesh no larger than 1 mm.

Loading group and exhaust valve where necessary.
CAUTION: when sizing the pipes, make sure not to exceed the maximum pressure drop on plant
side reported in the technical data table in Paragraph 11 (see useful head).
CAUTION: connect the pipes to their fittings always using the key to key method.
CAUTION: the expansion vessel on the unit has a limited capacity. The installer is in charge of
making sure that the expansion vessel is suited to the real capacity of the system, and if not, of
providing an additional expansion vessel.
CAUTION: The return pipe from the system must be installed near the label “WATER INLET”
otherwise the evaporator could freeze.
CAUTION: It is mandatory to install a metal filter (with mesh no larger than 1 mm) and a dirt
separator on the return pipe from the system labelled “WATER INLET”. If the flow switch is
manipulated or altered, or if the metal filter and dirt separator are missing, the warranty will
terminate immediately. The filter and dirt separator must be kept clean. Therefore after
installing the unit, you must make sure that they are still clean and check them regularly.
Tab
DETAIL A
SCALE 1 : 1
DETAIL B
SCALE 1 : 2