Checking The System Function (Output Test) - Viessmann Vitoclima 300-S Service Instructions For Contractors

Further details regarding the individual steps
A Three-digit display
B Key "Back"
C Key "Select"
D Key "Continue"
E Key "Exit"

Checking the system function (output test)

Allow the unit to operate in cooling
mode for at least 15 min at a high fan
speed.
Charging the external unit with refrigerant (if units/devices
must be separated)
If the external unit and the internal device must be separated, the external unit
can be charged with refrigerant.
1. Set the system to cooling.
2. Close the liquid valve (see
page 10).
Commissioning, inspection, maintenance
(cont.)
Select the installation test "It" with B/
D and confirm with C.
The installation test runs automati-
cally. At the end, the unit stops for
5 min.
The display shows "PSS" (test suc-
cessful) or "FAL" (fault).
The installation test can be terminated
by holding down key E for 5 s.
Check the temperature of the inrush-
ing and blown-out air.
The temperature differential should be
at least 8 K.
3. Close the suction gas valve (see
page 10), when the pressure gauge
of the gauge set (see Fig. on
page 8) indicates 0 bar.
4. Undo the refrigerant lines.
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