Technical Information; Maintenance - Rittal SK 3126.1 Series Montageanleitung

Notes
6.3 Changeover °C/°F
Press the Set key for 5 sec. to activate the setting mode. Hold the
GB
K1 or K2 key down until "PS" appears; confirm by pressing "Set".
Enter the code "22" to change from °C to °F in level "/5" (0 = °C
and 1 = °F). Keep the Set key held down for 5 sec. to save any
changes.
6.4 Changing the switching hysteresis
Press the Set key for 5 sec. to activate the setting mode. Hold the
K1 or K2 key down until "PS" appears; confirm by pressing "Set".
Enter the code "22" to change the switching hysteresis in level
"P1".
6.5 Programming
(see diagram 12.1 Programming)
In the EEPROM of the controller various parameters are stored
which can be changed by using the buttons H2, H3 and H4.
5 changeable parameters can be set in the stated ranges
(max. and min. values; see diagram 12.1).
The H2, H3 and H4 keys are multiple occupancy. To access pro-
gramming mode, "Set" is to be pressed and held down for 5 sec.
6.6 System message equipment
All system messages at the heat exchanger are recorded and
displayed as an error number by H1. System messages alternate
in the display with the current internal enclosure temperature
(see 11. Display screen and system analysis of electronic control).
6.7 System message contact (K1; potential-free)
The relay is normally closed. All system messages assigned to the
relay result in it opening. If the control voltage fails, this also results
in the relay opening. Terminal strip X1 provides the connection,
see Wiring diagram. K1 fault signal relay (NO contact/changeover
contact):
Terminal 3: NC (normally closed)
Terminal 4: C (connection between voltage supply and fault
signal relay)
Terminal 5: NO (normally open)
The definitions NC and NO refer to the deenergised state.
7. Supplementary functions
Filter mat use and changing
The PU foam filter mat available as an accessory is coarse and fil-
ters large dust particles or fluff from the air. Metallic filter mats are
used to trap oil condensation. These are also available as an ac-
cessory. Subject to the suction of the blower being high enough,
fine dust is blown through the filter mat and the external circuit of
the unit. This does not affect the unit's operation.
Fig. 7.1 Filter mat replacement
10

8. Technical information

8.1 Condensation discharge
When operating the air/air heat exchanger in surroundings, in
which, for example, there is oil/spray mist or high air humidity
present, these can be condensed in the unit's external circuit. You
merely have to remove the plastic stopper fitted to the bottom of
the enclosure in order to drain it off (Note: only the left hand stop-
per of the two plastic stoppers can be removed in the case of a
SK 3126.100 unit, as otherwise the protection rating will be lost!)
8.2 General information
Storage temperature: The air/air heat exchangers must not be ex-
posed to temperatures above +70°C.
Disposal can be carried out at the Rittal factory.
Technical modifications reserved.

9. Maintenance

The maintenance-free fans fitted in the unit have sealed ball-bear-
ings and are therefore protected against dust and humidity. The
life expectancy is at least 30,000 operating hours. The air/air heat
exchanger is thus largely maintenance free. It is merely the lamel-
la in the heat exchanger cassette that have to be cleaned from
time-to-time. This can be done by:
a) using compressed air to blow the dry dust off of them
b) using a detergent solution (max. 75°C) to wash off any grease
or oil residue (ensure that all sides are dry before refitting!).
The heat exchanger cassette can be removed from the enclosure
for cleaning by undoing the two eccentric screws. The louvred
grille and the front plates must have been unscrewed previously
so that this can be done.
The use of a filter mat is recommended only if large particles of lint
are present in the air, so that blockage of the heat exchanger is
prevented (Fig. 7.1 Filter mat replacement).
Attention!
Prior to any maintenance work, the power to the heat exchanger
unit must be disconnected.
10. Scope of supply and guarantee
1 x air/air heat exchanger ready for connection
1 x drilling template
1 x sealing tape
1 x set of mounting and operating instructions
1 x plug-in terminal strip
Guarantee:
This unit is covered by a 2-year guarantee from the date of supply,
subject to correct usage (see Safety notices in Section 4 as well).
Within this period, the returned unit will be repaired in the factory
or replaced free of charge. The air/air heat exchanger is to be
used for the cooling of enclosures only. Unauthorised utilisation or
incorrect connecting up will invalidate the manufacturer's guaran-
tee. No liability will be assumed for any damage arising from such
occasions.
Assembly instructions Rittal air/air heat exchangers