Lennox INNOV DM R Series, Application Manual

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INNOV@ ECFAN DMR -AGU-0912-E • 5 •
1.3 DX units cooling circuit
The entire refrigerating circuit is assembled in our warehouse including all pipe work and using only primary brand for
components. The workers involved in the welding and pipe work process are qualified by a third part according CEE
97/23 PED directive: it is worth to be underlined that this qualification for workers were not request, but it is our own
decision taking care of the quality and/or in general to the customer satisfaction. All DX unit (“A“, “W“, “F“, “D“, “Q“
versions) are in single circuit execution and are prechargerd with dry nitrogen for “A“, “D“ or with R407C refrigerant for
“W“, “F“, “Q“ versions.
Refrigerant different from R407C, like R22, R134a, R410A are available on request and previous check for local rules.
Compressors
On INNOV@DM-R units are installed only primary brand scroll compressors. Scroll compressor represent for CCAC
units the best solution in terms of efficiency and reliability. The internal compression ratio is very close to the typical
operating condition of CCAC giving the maximum in terms of COPs and the perfect balanced pressures at start up gives
big advantages to the e-motor in terms of reliability, mainly in this filed where frequent start up may be possible.
All motors are thermally protected with an internal sensors chain: in case of overload this sensor opens without giving
contacts to the connection box.
Cooling components (DX versions):
D Molecular mesh activated-alumina filter dryer.
D Flow indicator with humidity indicator. Indications are provided directly on the sight glass.
D Thermostatic valve with external equalization and integrated MOP function.
D High and low pressure switches.
D Schrader valves for checks and/or maintenance.
Electric control board
The electric control board is constructed and wired in accordance with Directives 73/23/EEC and 89/336/EEC and
related standards. The board may be accessed through a door after the main switch has been put off. All the remote
controls use 24V signals powered by an insulating transformer situated on the electric control board.
Note: The mechanical safety devices such as the high pressure switch are of the kind that trigger directly; their
efficiency will not be affected by any faults occurring in the microprocessor control circuit, in compliance with
97/23 PED.
Microprocessor control
The microprocessor built into the unit allows the different operating parameters to be controlled from a set of push
buttons situated on the electric control board:
D Switching On / Off of compressor to maintain the temperature set point T inside the shelter.
D Alarm management: - High / Low pressure;
- Dirty filters alarm;
- Air flow alarm.
D
Alarm signalling.
D
Display of operating parameters.
D
RS232 or RS485 serial output management (optional).
D
Phase sequence error (displayed only by the mP ADVANCED, it prevents the compressor from starting up).
See microprocessor control manual for further details, also in relation to particular customer specifications.