Carrier 48AK - Typical 48 EK VAV 24-V Control Circuit

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97

Fig. 78 — Typical 48EK VAV 24-V Control Circuit

Table of Contents

Table of Contents1
Safety Considerations1
Step 1 - Provide Unit Support1
- Roof Curb2
- Alternate Unit Support2
Installation1
Roof Mount2
Step 2 - Rig and Place Unit2
Step 3 - Field Fabricate Ductwork2
Step 4 - Make Unit Duct Connections2
- Base Unit Dimensions7
- Rigging Information19
- Rigging Weights20
- Physical Data21
- Operating Weights26
- CV Motor Weights26
- Vav Motor Weights26
- Air Distribution — Thru-The-Side27
- Air Distribution — Thru-The-Bottom27
- Evaporator Fan Motor Data27
- Combustion Fan Housing Location28
Step 5 - Install Flue Hood28
Step 6 - Trap Condensate Drain28
Step 7 - Install Gas Piping28
- Field Gas Piping29
- 48A,E Series Staged Gas Implementation29
Step 8 - Controls Options29
- Constant Volume Applications30
- Controls Options and Configurations30
- Staged Gas Unit Applications30
- Thermistor Designations30
- Thermistors30
- Variable Air Volume (Vav) Applications32
- Features with Network Applications33
- Field Power Supply33
- When Installing Units33
Step 9 - Make Electrical Connections33
- Power Wiring33
- Field Control Wiring43
- Economizer48
Step 10 - Make Outdoor-Air Inlet48
- Adding Seal Strip to Top of Hood Sides49
- Economizer Hood Assembly49
- Adding Foam Strip to Cross Member50
- Adding Foam Strip to Hood Side50
- Adding Seal Strip to Back of Hood Top Mounting Flange50
- Adding Seal Strip to Sides of Hood Top Mounting Flange50
- Accessory Differential Enthalpy Control51
- Accessory Enthalpy Control51
- Economizer Settings51
Step 12 - Install All Accessories54
- Motormaster III Control Baffle Details55
- Motormaster III Sensor Location55
- Install Motormaster III Controls55
- Electrical Connections55
- Ductwork57
- Side Supply and Return Units57
- Side Return Air Conversion57
Step 13 - Field Modifications57
- Power Exhaust Relocated to Side Return Duct58
- Unit Preparation58
- Compressor Mounting58
Start-Up58
- Crankcase Heaters59
- Variable Frequency Drive (VFD)59
- Carrier Default Program Parameter Values60
- Carrier VFD (Toshiba TOSVERT VF-S9) Program Parameter Values62
- Direct Digital Controls DIP Switch Configuration63
- Power Exhaust63
- DIP Switch Configuration64
- Condenser Fans and Motors64
- DIP Switch Factory Settings65
- Fan Performance65
- High Efficiency Motors79
- Air Quality Limits79
- Standard Efficiency Motors79
- Motor Limitations79
- Sequence of Operation80
- Return-Air Filters80
- Filter Replacement80
- Economizer Adjustment80
- User Defined Set Points81
- Software Control Link Points81
- Cooling, Variable Air Volume (Vav) Units82
- Gas Heating, Constant Volume (CV) Units82
- Heat Interlock Relay Wiring83
- Staged Gas Unit Heating83
- Gas Heating, Variable Air Volume (Vav) Units83
- Staged Gas System Components84
- Stage Gas System Inputs/Outputs84
- Operating Modes84
- Tempering (Cool) Mode84
- Navigator Display85
- Navigator Display Menu Structure85
- Morning Warm-Up85
- Space Temperature Reset Example86
- Occupied Heat and Morning Warm-Up Operation and Controlling Factors86
- Space Temperature Reset Sensor86
- Space Temperature Sensor Control86
- Field-Supplied Smoke Detector Wiring87
- Supply Air Temperature Reset87
- Power Exhaust Operation87
- Smoke Control Modes87
- Capacity Control, Cooling88
- Motormaster III Control88
- Head Pressure Control88
- Service Access89
- Cleaning89
- Main Burners89
Service89
- Typical Gas Heating Section90
- Gas Heat Section Details90
- Evaporator Coil90
- Condensate Drain90
- Reassembling the Coupling into the Unit91
- Lubrication91
- Evaporator Fan Coupling Assembly91
- Evaporator Fan Performance Adjustment91
- Evaporator Fan Service and Replacement92
- Belt Tension Adjustment92
- Evaporator-Fan Motor Replacement92
- Condenser-Fan Adjustment92
- Thermostatic Expansion Valve (TXV)93
- Power Failure93
- Refrigerant Charge93
- Gas Valve Adjustment93
- Cooling Charging Chart94
- Gas Valve94
- Main Burner Removal94
- Replacement Parts95
- Relief Devices95
- Typical Wiring Schematics95
- Compressor Protection95
- Protective Devices95
- Filter Drier95
- Typical Power Schematic96
- Typical 48EK VAV 24-V Control Circuit97
- Typical CV 24-V Control Circuit98
- Typical 48EK VAV 115-V Control Circuit99
- Typical 48EJ CV 115-V Control Circuit100
- Label Diagram - Staged Gas Heat101
- Typical Refrigerant Circuiting103
Troubleshooting103
- Typical Refrigerant Circuiting (48AJ,AK,AW,AY027,030)104
- Typical Refrigerant Circuiting (48AJ,AK,AW,AY035)105
- Typical Refrigerant Circuiting (48EJ,EK,EW,EY038,044)106
- Typical Refrigerant Circuiting (48AJ,AK,AW,AY040,050)107
- Typical Refrigerant Circuiting (48EJ,EK,EW,EY048)108
- Typical Refrigerant Circuiting (48EJ,EK,EW,EY054 and 058)109
- Typical Refrigerant Circuiting (48AJ,AK,AW,AY060)110
- Typical Refrigerant Circuiting (48EJ,EK,EW,EY064)111
- IGC Control (Heating and Cooling)113
- IGC Control Board LED Alarms114
- Diagnostic Leds114
- Control Board LED Alarms114
- I/O Channel Designations Base Module — CV115
- I/O Channel Designations Base Module — VAV115
- I/O Channel Designations Expansion Module (Field-Installed)115
- Service Training116
Start-Up Checklist117

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