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2.7
Main component description
Figure 4: Main components of Large Outdoor Condensing units
Bill of material 501 – General description
2.7.1
The standard bill of material for OMTE & OLTE units is 501. In general, these units have an air-
cooled condenser with 1 or 2 EC-fans for condensing temperature control.
A Tandem set of 2 Scroll compressors (ZB** for OMTE units, ZF** for OLTE units) provides the
required cooling capacity. OLTE units have single Digital compressors with LIV technology inside.
In Tandems one of the compressors is always a Digital Scroll, which allows modulation to very low
part-load conditions.
All compressors are equipped with a high-efficiency sound shell for best sound performance.
An oil management system with a combined oil separator (including the reservoir) and oil injection
devices secure sufficient compressor oil levels. Unit models OMTE-76D and OMTE-90D have only
the oil separator with oil return into the suction line.
An electronic controller XCM25D takes care for suction pressure regulation, fan speed control in
standard and heat recovery conditions, as well as for system safety.
Main safety features provided by the unit: compressor oil level control (only for OMTE-152D),
discharge temperature protection, voltage sensing, refrigerant charge level control and high- and
low-pressure safety.
Bill of material 502 – General description
2.7.2
The 502 bill of material is a version which is prearranged for heat recovery (HR). Mechanically the
unit has connections for external piping in the discharge line. An additional ball valve between the 2
connection ports allows the manual activation of the heat recovery functionality – please also see PI
diagrams in Chapter 2.7.
For HR activation the controller settings need to be adjusted. The controller hardware remains the
same as in the standard unit – see chapter 2.14 "Heat recovery mode – Optional" for details.
All other features and equipment are the same as in version 501.
2.7.3
Compressor
Unit
OMTE-90D-TFD-501
OMTE-76D-TFD-501
OMTE-152D-TFD-501
OLTE-82D-TFD-501
Table 4: Compressor model overview
6
Digital Scroll
ZBD45KCE-TFD-551
ZBD38KCE-TFD-551
ZBD76K5E-TFD-567
ZFD41K5E-TFD-567
Standard Scroll
ZB45KCE-TFD-551
ZB38KCE-TFD-551
ZB76K5E-TFD-567
ZF41K5E-TFD-567
C6.1.9/0219/E
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