Viessmann VITOCAL 300-G PRO Installation And Service Instructions Manual page 96

Commissioning, inspection, maintenance
Further details regarding the individual steps
Frost stat switching point, delivered con-
dition:
1SP = –1 °C
Open switching contact:
Frost protection enabled; com-
pressor shuts down (message
"CA Protectn device primry",
see Vitotronic 200, type WO1B
service instructions).
1HY = 3 K
Setting the frost stat switching points (if required)
Press the following keys:
1. Hold down
+
for 5 s; the first parameter is dis-
played.
2.
/ for the required parameter.
3.
to show the set value.
Parameter Description
1SP Switching point for opening the
switching contact
1HY Switching point hysteresis for
closing the switching contact
(1SP + 1HY)
All other parameters
Parameter only for emergency mode:
1PF Frost alarm in the case of sen-
sor fault
!
Please note
There will be no frost protection
for the heat pump if parameter
1PF is set to ON.
Set 1PF only to ON for short-
term emergency mode.
96
simultaneously
(cont.)
At 1SP + 1HY = 2 °C switching
contact closed:
Heat pump in standby mode.
4. Hold down
value simultaneously with
5. Release
to save the set value.
6. Press
or wait 30 s to exit the
menu.
Delivered con-
dition
–1 °C
3 K
Never adjust
OFF
and set the required
/
Setting range
–5 to –1
2 to 5 K
ON / OFF
.