Make Connections At Terminals X3.8/X3.9; Closing The Heat Pump - Viessmann VITOCAL 242-G Installation And Service Instructions Manual

Power supply
(cont.)
Version 3
L1, L2, L3
A
B
C
D
12, 11, 14
EF
Fig. 35
A Voltage range
Delay in s "Tt"
B
Over/undervoltage in % "
C
Phase asymmetry in % "Asy"
D

Make connections at terminals X3.8/X3.9

After connecting the power supply, one of the follow-
ing components must be connected at terminals X3.8
and X3.9:
Primary circuit pressure switch and/or frost stat
■
or
■ jumper supplied

Closing the heat pump

!
Please note
Leaking hydraulic connections lead to appliance
damage.
Check for leaks in the internal and on-site
■
hydraulic connections.
■ In the event of leaks, switch off the appliance
immediately. Drain off liquid via the drain
valve. Check the seating of seal rings. Always
replace displaced seal rings.
!
Please note
If a casing door is not securely closed this can
lead to damage from condensation, vibrations
and excessive noise.
Seal the casing door so it is soundproof and dif-
fusion-proof.
U"
Δ
LEDs explained in Fig. 35
E Voltage "Un":
■ Illuminates green if voltage is applied.
Relay "R":
F
■ Illuminates yellow if the phase sequence is cor-
rect.
Does not illuminate if the phase sequence is
■
incorrect.
■ Flashes yellow during delay "Tt".
Danger
The absence of system component earthing can
lead to serious injury from electrical current and
component damage in the event of an electrical
fault.
Always remake all earth connections.
The appliance and pipework must be connected
to the equipotential bonding of the building.
For assembly, see page 18.
Installation sequence
37