16
085 408 076a
13.3 Pfannenberg units with Standard- or Comfort-Controller
The following table describes the technical cause as well as the fault remedy as a function of the unit characteristics.
*
Air short-circuit:
An air short-circuit develops, if cool air at the air outlet of the cooling unit is led by means of power components built directly in front of it in an
unfavourable way, not into the switch cabinet, but directly to the air inlet of the cooling unit. The consequence is overheating of the power components due to the
lack of cooling.
14 Warranty Conditions
Warranty becomes null and void:
• in case of improper usage of the unit, noncompliance with ope-
rating conditions or nonobservance of instructions;
• If operated in rooms in which corrosives or acids are present in
the atmosphere;
• in case of damage caused by contaminated or jammed air filters;
• if a non-authorised person interrupts the cooling circulation,
modifies the unit or changes the serial number;
• in case of damage caused by transport or by accidents;
• for the exchange of parts by non-authorized companies.
In order to maintain your warranty rights please observe the following
when returning the unit:
• Enclose an exact description of the fault in the shipping package.
• Enclose proof of delivery (delivery note or copy of invoice).
• Return the unit together with all accessories; use the original
packaging or packaging of equivalent quality, send the unit frei-
ght prepaid and covered by an adequate transport insurance.
Observe the hints on transport mentioned in section 2.
Unit characteristics
Compressor:
OFF
Internal fan:
OFF
External fan:
OFF
Status LED:
OFF
Fault signal contact:
open
Compressor:
ON
Internal fan:
ON
External fan:
ON
Status LED:
flashing (seq. 3)
ult signal contact:
open
Compressor:
OFF
Internal fan:
OFF
External fan:
OFF
Status LED:
flashing (seq. 1)
Fault signal contact:
closed
Compressor:
OFF
Internal fan:
ON
External fan:
ON
Status LED:
flashing (seq. 2)
Fault signal contact:
open
Compressor:
OFF
Internal fan:
OFF
External fan:
OFF
Status LED:
flashing (seq. 1)
Fault signal contact:
open
Compressor:
ON
Internal fan:
ON
External fan:
ON
Status LED:
flashing (seq. 1)
Fault signal contact:
open
Compressor:
ON
Internal fan:
ON
External fan:
ON
Status LED:
flashing (seq. 2)
Fault signal contact:
open
Compressor:
normal control
characteristics
Internal fan:
ON
External fan:
normal control
characteristics
Status LED:
flashing (seq. 1)
Fault signal contact:
open
Pos
1
2
3
4
5
6
7
8
Technical causes
There is no supply of voltage to the unit.
The test mode of the unit is active. This
mode is left automatically at the latest after
60 s.
The input for the door limit switch is open
e.g. as a result of a switch cabinet door not
closed or a bridge not set.
High pressure pressostat or motor
protection switch has responded
(overheating). Compressor switches on
again automatically after the fault has been
remedied (cooling) with a delay of 30 s.
Unit adjustment by means of the coding
switch on the control electronics is not
plausible. The unit setting must be changed.
The upper temperature limit of the switch
cabinet has been exceeded.
The temperature sensor TS1 is defective or
has not been detected.
In the switch cabinet, if a short circuit in the
air circuit* occurs, no effective cooling of the
switch cabinet is possible.
Air-conditioning is requested within short
cycle times.
Fault remedy
Check back-up fuse and/or connect supply
voltage
The unit switches to test mode once after
each new connection to the power supply.
No remedy of fault necessary.
Insert link, close door contact switch or,
with an engaged door contact switch,
close the door
Clean filter mat or heat exchanger in the
external circulation. Possibly check the
power dissipation in the switch cabinet to
the installed cooling capacity of the air
conditioner.
Observe the operating instructions and
note the coding key of the coding switch.
Clean filter mat or heat exchanger in the
external circulation. Possibly check the
power dissipation in the switch cabinet to
the installed cooling capacity of the air
conditioner.
Replace the contact sensor TS1 or replace
the complete electronic control with a
fixed-wired temperature sensor
Get in touch with the service department.
Relocate the power components in the
switch cabinet or relocate the cooling unit.
Select a top-mounting cooling unit or side-
mounting cooling unit as an alternative
depending on the space situation.
