• Chapter 1 Introduction
• Section Il. Equipment Description And Data
• 1.7.3 A. Cooling Capacity On Cool, Btu/Hour
• Location And Description Of Major Components
• Figure 1-1. Air Conditioner, 3/4 Views
• Figure 1-2. Air Conditioner, Condenser Section (Sheet 2 Of 2)
• 1.8.2 Evaporator Section
• Figure 1-3. Air Conditioner, Evaporator Section (Sheet 2 Of 2)
• Figure 1-4. Air Conditioner, Top View, Top Covers Removed, Heating Section
• 1.10 Equipment Data
• 1.10.8 Evaporator And Condenser Fan Motor Rating
• Section Ill. Principles Of Operation
• Figure 1-5. Refrigerant Flow Diagram
• 1.12 Heating.
• Chapter 2 Operating Instructions
• Temperature Selector Switch
• Cool Air
• Section Ii. Preventive Maintenance Checks And Services
• Diagram
• Table 2-1. Operator/Crew Preventive Maintenance Checks And Services - Continued
• Section Ill. Operation Under Usual Conditions
• Table 2-2. Operating Settings
• 2.4 Cooling Operation
• 2.5 Low Heat Operation
• 2.6 High Heat Operation
• 2.7 Ventilating Operation
• Section Iv. Operation Under Unusual Conditions
• 2.9.2 Protection.
• 2.10 Operation In Dusty Or Sandy Areas.
• 2.11 Operation Under Rainy Or Humid Conditions
• 2.12 Operation In Salt Water Areas
• Chapter 3 Operator Maintenance
• Section Il. Service Upon Receipt
• Figure 3-1. Installation Dimensions (Sheet 1 Of 2)
• Figure 3-1. Installation Dimensions (Sheet 2 Of 2)
• 3.5 Installation Or Removal.
• Figure 3-2. Mounting Hole Location
• Table 3-1. Ac Power Supply Requirements
• Table 3-3. Connector Pin Wiring, Model F18h
• Figure 3-3. Connector J11 Wired At Terminal Board Tb3 (Single Phase)
• Figure 3-4. Connector J1 Wired At Termlnal Board Tb3 (Single Phase)
• Figure 3-5. Connector J11 Wired At Terminal Board Tb3 (Three Phase)
• Figure 3-6. Connector J11 Wired At Terminal Board Tb3 (Three Phase)
• Figure 3-7. Connector J11 (Through J6) Wired At Termlnal Board Tb3 (Three Phase)
• Installation Or Removal. - Continued.
• Figure 3-9. Lifting, Using Slings
• Figure 3-10. Wall Space Required
• Installation Or Removal. - Continued
• Installation Or Removal. - Continued
• 3. 6 Preliminary Servicing And Adjustment Of Equipment.
• Premiminary Servicing And Adjustment. - Continued
• 3.7 Removal Neutral Jumper (Ground Isolation).
• Figure 3-11. Neutrai Jumper Removal
• 3.8 Low Pressure Cutoout Jumper.  
• Figure 3-12. Jumper Across Lpco
• Low Perssure Cutout Jumper. - Continued
• Chapter 4 Troubleshooting
• Table 4-1. Operational Status
• Table 4-2. Troubleshooting Symptom Index - Continued
• Table 4-3. Electrical Components Tests - Continued
• Electrical Components Tests - Continued
• Electrical Components Tests - Continued
• Figure 4-1. Junction Box And Control Panel Removal
• Figure 4-2. Terminal Location, Connector J2
• Figure 4-3. Terminal Location, Circuit Breaker Cb1
• Figure 4-4. Terminal Location, Circuit Breaker Cb2
• Figure 4-5. Terminal Location, Relay K1
• Figure 4-6. Terminal Location, Relay K1 (Model Mhp-20-4-08)
• Figure 4-7. Terminal Location, Relays K2 And K3
• Figure 4-8. Terminal Location, Relay K4
• Figure 4-9. Terminal Location, Relays K4 And K5 (Model Mhp-20-4-08 Only)
• Figure 4-10. Terminal Location, Transformer T1
• Figure 4-11. Terminal Location, Rectifier Cr1
• Figure 4-12. Terminal Location, Mode Selector Switch S1
• Figure 4-13. Terminal Location, Mode Selector Switch S1
• Table 4-4. Model F18h Mode Switch Positions (Single Phase)
• Table 4-6. Model Mhp-20-4-08 Mode Switch Positions (Three Phase)
• Figure 4-14. Terminal Location, Temperature Selector Switch S3
• Figure 4-15. Terminal Location, Fan Speed Switch S2
• Figure 4-16. Terminal Location, Relay K5 And Capacitor C4 (Single Phase)
• Figure 4-17. Terminal Location, Capacitors C2, C3, And C5 (Single Phase)
• Figure 4-18. Terminal Location, Heater Thermostat S6 (Overheat Safety)
• 4.2 Air Conditioner Fails To Start In Any Mode.
• G. Check Control Circuit Breaker Switch
• 4.3 Evaporator Blower Fails To Start.
• 4.4 Compressor Fails To Start
• 4.5 Condenser Fan Fails To Start.
• 4.6 Little Or No Cooling Action.
• H. Check Refrigerant
• M. Check Solenod L2 Operation.
• S. Check Solenoid Valve L1
• 4.7 Cooling Action Stops After Operating For Short Time.
• 4.8 Little Or No Heating In Low Heat Mode.
• E. Check Heater Cutout Switch S6
• 4.9 Little Or No Additional Heating In High Heat
• F. Check Mode Selector Switch S1.
• 4.10 Temperature Selector Not Effective
• 4.11 Unusual Noise Or Vibration.
• F. Tighten Loose Screws
• 4.12 Unit Runs, But Bischarge Air Is Warm.
• 4.13 Frosted Evaporator Coil.
• 4.14 Excessive Head Pressure.
• 4.15 L Ow Head Pressure
• 4.16 Excessive Suction Pressure.
• 4.17 Low Suction Pressure
• Chapter 5 Unit Maintenance
• 5.1 General Maintenance Procedures. - Continued
• General Maintenance Procedures. - Continued
• General Maintenance Procedures. - Continued
• Table 5-1. Unit Preventive Maintenance Checks And Services
• 5.2 Radio Interference Suppression. 
• 5.3 Emi Capacitors C2 And C1.
• Figure 5-1. Capacitor C1
• .4 Capacitors C2 (Three-Phase Units) And C6 (Single-Phase Unit).
• 5.5 Resistor R1
• Figure 5-3. Resistor R1
• 5.6 Rectifier Cr1.
• Figure 5-4. Rectifier Cr1
• 5.7 Transformer T1
• Figure 5-5. Transformer T1
• Transformer T1. - Continued
• 5.8 Relays K4 (And K5 On Model Mhp-20-4-08.). 
• Figure 5-6. Relays, K4 And K5
• Relays K4 (And K5 On Model Mhp-20-4-08). - Continued
• Relays K4 (And K5 On Model Mhp-20-4-08). - Continued
• Figure 5-7. Control Module Removal
• 5.9 Relay K1.
• Figure 5-8. Relay K1
• Relay K1. - Continued
• 5.10 Relays K2 And K3.
• Figure 5-9. Relays K2 And K3
• Relays K2 And K3. - Continued
• Relays K2 And K3. - Continued
• Relays K2 And K3. - Continued
• Figure 5-10. Control Module
• 5.11 Mode Switch S1
• Figure 5-11. Switch S1
• Figure 5-12. Selector Switch Wire Termination
• Mode Switch S1. - Continued
• 5.12 Temperature Switch S3.
• Figure 5-13. Temperature Selector Switch S3
• Temperature Switch S3. - Continued
• Temperature Switch S3. - Continued
• 5.13 Evaporator Fan Switch S2.
• Figure 5-14. Fan Speed Switch S2
• Evaporator Fan Switch S2. - Continued
• Evaporator Fan Switch S2. - Continued
• 5.14 Control Circuit Breaker Cb2.
• Figure 5-15. Circuit Breaker Cb2
• Control Circuit Breaker Cb2. - Continued
• 5.15 Circuit Breaker Cb1.
• Figure 5-16. Circuit Breaker Cb1
• Circuit Breaker Cb1. - Continued
• Circuit Breaker Cb1. - Continued
• 5.16 Connector P2.
• Figure 5-17. Connector P2
• Connector P2. - Continued
• Connector P2. - Continued
• Connector P2. - Continued
• Connector P2. - Continued
• 5.17 Capacitors (Single Phase) C2, C3, C5.
• Figure 5-18. Capacitors C2, C3, And C5 (Single Phase)
• 5.18 Relay K5 (Single Phase)
• Figure 5-19. Relay K5 (Single Phase)
• 5.19 Capacitor C4 (Single Phase).
• Figure 5-20. Capacitor C4 (Single Phase)
• 5.20 Air Filter. 
• Figure 5-21. Return Air Filter
• Air Filter. - Continued
• 5.21 Mist Elimnator.
• Mist Eliminator. - Continued
• Figure 5-22. Mist Eliminator
• Figure 5-23. Fresh Air Damper Adjustment
• 5.22 Fresh Air Damper.
• Figure 5-24. Vent Damper
• Fresh Air Damper. - Continued
• Fresh Air Damper. - Continued
• 5.23 Fresh Air Screen.
• Figure 5-25. Fresh Air Screen
• 5.24 Condensate Lines.
• Figure 5-26. Condensate Lines
• 5.25 Evaporator Coil Cleaning.
• Evaporator Coil Cleaning. - Continued
• 5.26 Condenser Coil Cleaning.
• Condenser Coil Cleaning. - Continued
• 5-27 Condenser Fan Switch S7.
• Figure 5-27. Fan Switch
• 5.28 Heater Thermostate (Overheat Safety).
• Figure 5-28. Heater Thermostat
• 5.29 Heater.
• Figure 5-29. Heater
• Heater. - Continued
• Heater. - Continued
• Chapter 6 Direct And General Support Maintenance
• Figure 6-1. Pressure Test
• Pressure Test. - Continued
• Table 6-1. Normal Temperature - Pressure Relationships
• Table 6-3. Low Head Pressure
• 6.2 Leak Test
• Leak Test. - Continued
• Leak Test. - Continued
• Leak Test. - Continued
• 6.3 Repair.
• Repair. - Continued
• Repair. - Continued
• Repair. - Continued
• 6.4 Releasing Refrigerant.
• Releasing Refrigerant. - Continued
• 6.5 Nitrogen Purge
• Figure 6-3. Nitrogen Tank Connection
• 6.6 Evacuation.
• Figure 6-4. Evacuating System
• 6.7 Refrigerant Chargeing With Gas.
• Figure 6-5. Refrigerant Charging, Gas
• Refrigerant Charging With Gas. - Continued
• Refrigerant Charging With Gas. - Continued
• 6.8 Refrigerant Charging With Liquid
• Figure 6-6. Refrigerant Charging, Liquid
• Refrigerant Charging With Liquid. - Continued
• Refrigerant Charging With Liquid. - Continued
• 6.9 Compressor.
• Compressor. - Continued
• Compressor. - Continued
• Compressor. - Continued
• Figure 6-7. Compressor Burnout Cleanup3
• Compressor. - Continued
• Figure 6-8. Compressor Replacement
• Compressor. - Continued
• 6.10 Compressor Crankcase Heater
• Figure 6-9. Crankcase Heater
• 6.11 Condenser Coil.
• Figure 6-10. Condenser Coil
• Condenser Coil. - Continued
• 6.12 Receiver.
• Figure 6-11. Receiver
• Receiver. - Continued
• 6.13 Sight Glass.
• Figure 6-12. Sight Glass
• Sight Glass. - Continued
• 6.14 Drier/Filter (Dehydrator).
• Figure 6-13. Drier/Filter
• 6.15 Solenoid Valves
• Figure 6-14. Solenoid Valve
• Solenoid Valves. - Continued
• Figure 6-15. Solenoid Valve Disassembly
• Solenoid Valves.- Continued
• 6.16 Expansion Valve
• Figure 6-16. Expansion Valve
• Expansion Valve. -Continued
• 6.17 Evaporator Coil
• Figure 6-17. Evaporator Coil
• Evaporator Coil. - Continued
• 6.18 Bulb Well
• Figure 6-18. Bulb Well
• Bulb Well. - Continued
• 6.19 Accumulator.
• Figure 6-19. Accumulator
• Accumulator. - Continued
• 6.20 Charging Valves
• Figure 6-20. Charging Valve
• 6.21 Pressure Relief Valve
• Figure 6-21. Pressure Valve
• 6.22 Actuating Cylinder.
• Figure 6-22. Actuating Cylinder
• Actuating Cylinder.- Continued
• Figure 6-23. Actuating Cylinder - Model Mhp-20-4-08
• Actuating Cylinder. - Contiued
• 6.23 Condenser Louver Adjustment
• Condensor Louver Adjustment - Continued
• Condensor Louver Adjustment - Continued
• Figure 6-25. Removing Condenser Fan Louver
• Figure 6-26. Removing Condenser Fan Louver - Model Mhp-20-4-08
• Condender Louver Adjustment. - Continued
• 6.24 Condensor Fan And Motor.
• Figure 6-27. Condenser Fan And Motor
• Figure 6-28. Condenser Fan And Motor - Model Mhp-20-4-08
• Condenser Fan And Motor. - Continued
• Condenser Fan And Motor. - Continued
• 6.25 High And Low Pressure Switches
• Figure 6-29. High And Low Pressure Switch
• High And Low Pressure Switches. - Continued
• 6.26 Quench Valve.
• Figure 6-30. Quench Valve
• Quech Valve. - Continued
• 6.27 Pressure Regulators
• Figure 6-31. Pressure Regulator
• Pressure Regulators. - Continued
• 6.28 Evaporator Blower And Motor.
• Figure 6-32. Evaporator Blower And Motor (Sheet 1 Of 3)
• Figure 6-32. Evaporator Blower And Motor (Sheet 2 Of 3)
• Evaporator Blower And Motor. .-Continued
• Figure 6-32. Evaporator Blower And Motor (Sheet 3 Of 3)
• Evaporator Blower And Motor. .-Continued
• 6.29 Motor.
• Motor. -Continued
• Figure 6-33. Imc Motor
• Figure 6-34. Welco Motor
• Motor. -Continued
• Motor -Continued
• 6.30 Motor.
• Motor. -Continued
• Figure 6-35. Welco Evaporator Motor - Model Mhp-20-4-08
• Figure 6-36. Welco Condenser Motor- Model Mhp-20-4-08
• Motor. -Continued
• Chapter 7 For Storage Or Shipment
• 7.2 Shipment
• Appendix A References
• Appendix B Maintenance Allocation Chart
• B.3 Explanation Of Columns In The Mac
• B.4 B.4.1 Column 1- Reference Code
• Section Il. Maintenance Allocation Chart
• Maintenance Allocation Chart - Continued
• Maintenance Allocation Chart - Continued
• Maintenance Allocation Chart - Continued
• Maintenance Allocation Chart - Continued
• Section Iv. Remarks
• Appendix C Components Of End Item (Coei) And Basic Issue Items (Bll) Lists
• Section Ii. Components Of End Item List
• Appendix D Expendable Supplies And Materials List
• Fo-1. Wiring Diagram, Single Phase, 50/60 Hertz, 230 Volts (Model F18h)
• Fo-2. Wiring Diagram, Single Phase, 50/60 Hertz, 230 Volts (Model F18h)
• Fo-3. Wiring Diagram, 3 Phase, 50/60 Hertz, 208 Volts (Model F18h-3)
• Fo-4. Wiring Diagram, 3 Phase, 50/60 Hertz, 208 Volts (Model F18h-3)
• Fo-5. Wiring Diagram, 3 Phase, 400 Hertz, 208 Volts (Model F18h-4)
• Fo-6. Wiring Diagram, 3 Phase, 400 Hertz, 208 Volts (Model F18h-4)
• Fo-7. Wiring Diagram, 3 Phase, 400 Hertz, 208 Volts (Model F18h-3a And F18h-4a)
• Fo-8. Wiring Diagram, 3 Phase, 400 Hertz, 208 Volts (Model F18h-3a And F18h-4a)
• Diagram
• Fo-10. Wiring Schematic (Single Phase) (Model F18h)
• Fo-11. Wiring Schematic (Three Phase) (Model F18h-3 And F18h-4)
• Fo-11. Wiring Schematic (Three Phase) (Model F18h-3a And F18h-4a)
• Fo-13. Wiring Schematic (Three Phase)
• I N D E X
• I N D E X - Continued
• I N D E X - Continued
• I N D E X - Continued
• I N D E X - Continued
• I N D E X - Continued
• I N D E X - Continued
• I N D E X - Continued
• I N D E X - Continued
• The Metric System And Equivalents

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