Aaon CB-060 Manuale Utente

CB SERIES Condensing Units Installation, Operation & Maintenance FOR YOUR SAFETY Do not store or use gasoline or oth

10 Direct Expansion (DX) Condensing Units CB Series condensing units are factory assembled and wired, including a full charge of R-410A refrige

11 Installation AAON equipment has been designed for quick and easy installation. Locating Unit CB Series condensing units are designed for ou

12 blow toward windows less than 25 feet away. Heat pumps require special location consideration in areas where snow accumulation can

13 electrically grounded in accordance with local codes, or in the absence of local codes, the current National Electric Code, ANSI/NFPA 70

14 Wire control signals to the unit’s low voltage terminal block located in the controls compartment. If any factory installed wiring

15 Determining Refrigerant Line Size The piping between the condenser and low side must ensure: 1. Minimum pressure drop, and 2. Continuous

16 Liquid Line Routing Care should be taken with vertical risers. When the system is shut down, gravity will pull liquid down the vertical

17 A double suction riser can be applied to the situation of part load operation with a suction riser. A double suction riser is designed

18 When installing hot gas bypass risers, an oil drip line must be provided at the lowest point in the system. The oil drip line must be verti

19 The liquid lines have been chosen to maintain velocities between 100 and 350 fpm. The suction line diameters are selected to limit velo

20 Table 2 - Predetermined Line sizes for CB units with two step compressors and R-410A Model Connection Sizes Predetermined Line Size Liquid Suction

21 Startup (See back of the manual for startup form.) Compressors All compressors are equipped with crankcase heaters, whic

22 Units equipped with hot gas reheat must be charged with the hot gas valves closed while the unit is in cooling mode. After charging, unit should

23 Correct an overcharged system by reducing the amount of refrigerant in the system to lower the sub-cooling. The system is underch

24 Table 5 - R-410A Refrigerant Temperature-Pressure Chart °F PSIG °F PSIG °F PSIG °F PSIG °F PSIG 20 78.3 47 134.7 74 213.7 101 321.0 128 463.2 21

25 Operation Unit operations should be controlled with thermostat, or unit controller, never at the main power supply, except for emer

26 Figure 3 - Variable Capacity Compressor Controller Low Voltage Terminals 24COM Module Common 24VAC Module Power C1 & C2 Demand Input P1

27 Figure 4 - Compressor Controller Flash Code Details Table 7 - Thermistor Temperature vs. Resistance Values °C °F kΩ °C °F kΩ -40 -40 2889.60 75

28 Low Ambient Options The condenser fan cycling option is used to operate a refrigerant system down to 35°F outside air temperature. As the

29 used. In either case, the tool should be applied in the direction of the fins. Coil surfaces can be easily damaged (fin edges

3 Table of Contents Safety ...

30 may be beneath any soils, grease or dirt; therefore, these barriers must be removed prior to application of this product. As in all su

31 Refrigerant Piping Diagrams Figure 5– A/C only piping, AHU above CU

32 Figure 6 – A/C only piping, AHU below CU

33 Figure 7 – Modulating hot gas reheat piping, AHU above CU

34 Figure 8 – Modulating hot gas reheat piping, AHU below CU

35 Figure 9 – Hot gas bypass piping, AHU above CU

36 Figure 10 – Hot gas bypass piping, AHU below CU

37 Figure 11 – Modulating hot gas reheat with hot gas bypass piping, AHU above CU

38 Figure 12 – Modulating hot gas reheat with hot gas bypass piping, AHU below CU

39 Figure 13 – Heat pump piping, AHU above CU

4 Index of Tables and Figures Tables: Table 1 - Recommended Elevation Minimums ...

40 Figure 14 – Heat pump piping, AHU below CU

41 Figure 15 – Heat pump with modulating hot gas reheat piping, AHU above CU

42 Figure 16 – Heat pump with modulating hot gas reheat, AHU below CU

CB Series Startup Form Date:______________ Job Name:_____________________________________________________________________ Address:_________________

Refrigeration System 1 - Heating Mode (Heat Pump Only) Pressure Saturated Temperature Line Temperature Sub-cooling Superheat Discharge Suction

Literature Change History June 2013 New installation and operation manual

AAON 2425 South Yukon Ave. Tulsa, OK 74107-2728 Phone: 918-583-2266 Fax: 918-583-6094 www.aaon.com CB Series Installation, Operation & Ma

5 Safety Attention should be paid to the following statements:

6 GROUNDING REQUIRED All field installed wiring m

7 1. Startup and service must be performed by a Factory Trained Service Tech

8 CB Base Model and Features Description CB - B - 060 - 3 - B - 1 : A D 0 0 0 A 0 Series and Generation Design Sequence Unit Size Voltage Compr

9 General Description AAON® CB Series condensing units have been designed for outdoor installation only. Startup and service must be performed