AAON CB-024 - Page 53

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Refrigeration System 1 - Heating Mode (Heat Pump Only)

Pressure

Saturated

Temperature

Line

Temperature

Sub-cooling

Superheat

Discharge

Suction

Liquid

Air-Cooled Condenser Fan

Alignment_____

Check Rotation_____

Nameplate Amps________

Number

Main Page

Table of Contents2
AAON CB Series Features and Options Introduction5
Safety6
CB Base Model and Features Description10
General Description11
Codes and Ordinances11
Receiving Unit11
Storage12
Direct Expansion (DX) Condensing Units12
Wiring Diagrams13
General Maintenance13
Installation14
Lifting the Unit14
Locating Unit14
Figure 1 - Forklift Channels & Access Panel14
Mounting Isolation15
Access Panel15
Table 1 - Recommended Elevation Minimums15
Figure 2 - Condensing Unit Clearances15
Electrical16
Figure 3 - Utility Entry16
Thermostat17
Refrigerant Piping18
General18
Determining Refrigerant Line Size18
Liquid Line Sizing19
Suction Line Sizing20
Figure 4 - Heat Pump Piping Schematic of Suction Vapor Flow down in Double Riser21
Figure 5 - Heat Pump Piping Schematic of Discharge Vapor Flow up in Double Riser21
Hot Gas Bypass Line22
Hot Gas Reheat22
Predetermined Line Sizes23
Table 2 - Predetermined Line Sizes for CB Units with Two Step Compressors and R-410A25
Figure 6 - Riser Height Versus Total Equivalent Line Length25
Startup26
Compressors26
Charging Refrigerant & Adjusting Refrigerant Charge27
Before Charging27
Checking Liquid Sub-Cooling27
Checking Evaporator Superheat28
Adjusting Sub-Cooling and Superheat Temperatures28
Table 3 - Acceptable Refrigeration Circuit Values28
Air Flow29
Table 4 - Performance Testing Air Flow Setpoints29
Table 5 - R-410A Refrigerant Temperature-Pressure Chart30
Operation31
Thermostat Operation31
Compressor31
Variable Capacity Compressor Controller31
Table 6 - Demand Signal Vs. Compressor Capacity Modulation32
Figure 7 - Variable Capacity Compressor Controller32
Table 7 - Thermistor Temperature Vs. Resistance Values33
Figure 8 - Compressor Controller Flash Code Details33
Low Ambient Operation34
Figure 9 - Adjustable Fan Cycling Switch34
LAC Valve35
Figure 10 - Piping Schematic of Example System Using the LAC Valve35
Condenser Flooding36
Compressor Lockouts36
Table 8 - Condenser Flooding36
Figure 11 - Adjustable Compressor Lockout36
Maintenance37
Coils37
E-Coated Coil Cleaning37
DX Cooling39
Condenser Fan Motor39
Replacement Parts39
Warranty, Service, and Parts Department39
Refrigerant Piping Diagrams40
Figure 12- A/C Only Piping, AHU above CU40
Figure 13 - A/C Only Piping, AHU below CU41
Figure 14 - Modulating Hot Gas Reheat Piping, AHU above CU42
Figure 15 - Modulating Hot Gas Reheat Piping, AHU below CU43
Figure 16 - Hot Gas Bypass Piping, AHU above CU44
Figure 17 - Hot Gas Bypass Piping, AHU below CU45
Figure 18 - Modulating Hot Gas Reheat with Hot Gas Bypass Piping, AHU above CU46
Figure 19 - Modulating Hot Gas Reheat with Hot Gas Bypass Piping, AHU below CU47
Figure 20 - Heat Pump Piping, AHU above CU48
Figure 21 - Heat Pump Piping, AHU below CU49
Figure 22 - Heat Pump with Modulating Hot Gas Reheat Piping, AHU above CU50
Figure 23 - Heat Pump with Modulating Hot Gas Reheat, AHU below CU51
CB Series Startup Form52
Literature Change History55
(Acp J00187)56

AAON CB-024 - Page 53

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