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Ameristar M4AC6 Installer's Manual

Split system cooling
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Installer's Guide
Split System Cooling
M4AC6
M4AC6018A1000A
M4AC6024A1000A
M4AC6030A1000A
M4AC6036A1000A
M4AC6042A1000A
M4AC6048A1000A
Only qualified personnel should install and service the equipment. The installation, starting up, and servicing of heating, ventilating,
and air-conditioning equipment can be hazardous and requires specific knowledge and training. Improperly installed, adjusted or
altered equipment by an unqualified person could result in death or serious injury. When working on the equipment, observe all pre-
cautions in the literature and on the tags, stickers, and labels that are attached to the equipment.
April 2020
Note: "Graphics in this document are for representation only.
Actual model may differ in appearance."
SAFETY WARNING
88-M4PW003-1B-EN

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  • Page 1 Installer’s Guide Split System Cooling M4AC6 M4AC6018A1000A M4AC6024A1000A M4AC6030A1000A M4AC6036A1000A M4AC6042A1000A M4AC6048A1000A Note: “Graphics in this document are for representation only. Actual model may differ in appearance.” SAFETY WARNING Only qualified personnel should install and service the equipment. The installation, starting up, and servicing of heating, ventilating, and air-conditioning equipment can be hazardous and requires specific knowledge and training.

  • Page 2: Table Of Contents

    Table of Contents Section 1. Safety................................2 Section 2. Unit Location Considerations........................3 Section 3. Unit Preparation............................4 Section 4. Setting the Unit.............................5 Section 5. Refrigerant Line Considerations........................5 Section 6. Refrigerant Line Routing..........................6 Section 7. Refrigerant Line Brazing..........................7 Section 8. Refrigerant Line Leak Check........................9 Section 9.

  • Page 3: Section 2. Unit Location Considerations

    Section 2. Unit Location Considerations 2.1 Unit Dimensions and Weight Table 2.1 Unit Dimensions and Weight Models H x D x W (in) Weight* (lb) M4AC6018A 29 x 30 x 33 M4AC6024A 29 x 30 x 33 M4AC6030A 42 x 30 x 37 37 x 34 x 37 M4AC6036A 45 x 34 x 37...

  • Page 4: Section 3. Unit Preparation

    2.3 Suggested Locations for Best Reliability Ensure the top discharge area is unrestricted for at least five (5) feet above the unit. Avoid Install Near Bedrooms Three (3) feet clearance must be provided in front of the control box (access panels) and any Min 5’...

  • Page 5: Section 4. Setting The Unit

    Section 4. Setting the Unit 4.1 Pad Installation When installing the unit on a support pad, such as a concrete slab, consider the following: • The pad should be at least 1” larger than the unit on all sides. • The pad must be separate from any structure. •...

  • Page 6: Section 6. Refrigerant Line Routing

    5.4 Refrigerant Line Insulation Important: The Vapor Line must always be Vapor Line Liquid Line insulated. DO NOT allow the Liquid Line and Insulation Vapor Line to come in direct (metal to metal) contact. 5.5 Reuse Existing Refrigerant Lines CAUTION If using existing refrigerant lines make certain that all joints are brazed, not soldered.

  • Page 7: Section 7. Refrigerant Line Brazing

    8 Feet Maximum Wall Isolator Line Set 8 Feet Maximum Side View Secure Vapor Line using isolators every 8 ft. Secure Liquid Line directly to Vapor Line using tape, wire, or other appropriate method every 8 ft. Isolation In Wall Spaces Wall Sealant Ductwork...
  • Page 8 STEP 2 - Remove the pressure tap cap and valve cores from both service valves. STEP 3 - Purge the refrigerant lines and indoor coil with dry nitrogen. STEP 4 - Wrap a wet rag around the valve body to avoid heat damage and continue the dry nitro- gen purge.

  • Page 9: Section 8. Refrigerant Line Leak Check

    STEP 5 - Replace the pressure tap valve cores after the service valves have cooled. Section 8. Refrigerant Line Leak Check 8.1 Check For Leaks STEP 1 - Pressurize the refrigerant lines and 150 PSIG evaporator coil to 150 PSIG using dry nitrogen. STEP 2 - Check for leaks by using a soapy solu- tion or bubbles at each brazed location.

  • Page 10: Section 10. Service Valves

    STEP 2 - Observe the micron gauge. Evacuation is complete if the micron gauge does not rise above 500 microns in one (1) minute. 1 MIN. Once evacuation is complete blank off the vacuum pump and micron gauge, and close the valves on the manifold gauge set.
  • Page 11 11.2 Low Voltage Hook-up Diagrams With M4AC6 Outdoor Thermostat Air Handler Unit 24 VAC HOT 24 VAC Common Blue COOL/HEAT 1st STAGE HEATING 2nd STAGE White EMERGENCY HEAT Pink WH/BLK WH/BLK • Units with pigtails require wirenuts for connections. Cap all unused wires.

  • Page 12: Section 12. Electrical - High Voltage

    Section 12. Electrical - High Voltage 12.1 High Voltage Power Supply WARNING LIVE ELECTRICAL COMPONENTS! During installation, testing, servicing, and troubleshooting of this product, it may be nec- essary to work with live electrical components. Failure to follow all electrical safety precau- tions when exposed to live electrical compo- nents could result in death or serious injury.

  • Page 13: Section 14. System Charge Adjustment

    STEP 3 - Turn on disconnect(s) to apply power to the indoor and outdoor units. STEP 4 - Wait one (1) hour before starting the unit if compressor crankcase heater acces- sory is used and the Outdoor Ambient is below 60 MIN.
  • Page 14 14.2 Subcooling Charging in Cooling (Above 55º F Outdoor Temp.) STEP 1 - Use the refrigerant line total length and lift measurements from Section 5.3. Total Line Length = __________ Ft. Vertical Change (Lift) = __________ Ft. LIFT STEP 2 - Determine the final subcooling value using total Line Length and Lift measured in STEP 1 and the charts below. 018 Units 024 Units SUBCOOL CHARGING CHART CORRECTIONS TABLE (FOR LINE LENGTH AND RISE)
  • Page 15 STEP 3 - Stabilize the system by operating for a minimum of 20 minutes. At startup, or whenever charge is removed or 20 MIN. added, the system must be operated for a mini- mum of 20 minutes to stabilize before accurate measurements can be made.
  • Page 16 STEP 6 - Adjust refrigerant level to attain proper gage pressure. Add refrigerant if the Liquid Gage Pressure is lower than the chart value. 1. Connect gages to refrigerant bottle and unit as illustrated. 2. Purge all hoses. 3. Open bottle. 4.

  • Page 17: Section 15. Checkout Procedures And Troubleshooting

    14.3 Weigh-In Method for Charging Weigh-In Method can be used for the initial installation, or anytime a system charge is being replaced. Weigh-In Method can also be used when power is not available to the equipment site or operating conditions (indoor/outdoor temperatures) are not in range to verify with the subcooling charging method.
  • Page 18 15.2 Troubleshooting SYSTEM FAULTS REFRIGERANT CIRCUIT Head Pressure Too High Head Pressure Too Low Suction Pressure Too High Suction Pressure Too Low Liquid Refrig. Floodback (TXV/EEV) Liquid Refrig. Floodback (Cap. Tube) I.D. Coil Frosting Compressor Runs Inadequate or No Cooling/Htg ELECTRICAL Compressor &...
  • Page 19 TROUBLESHOOTING Compressor fails to start Contactor check Is contactor engergized? Go To: Compressor won’t run (contacts closed) Wait 3 minutes and check contactor Check for 24 volts AC coil again across contactor coil Is voltage If applicable, is TDR present at Replace contactor input voltage contactor coil?
  • Page 20 TROUBLESHOOTING Compressor won’t run Contactor is closed Check for high voltage to contactor Check for open IOL Is high voltage present (Internal Overload) at T1 and T2 ? Check resistance of C to S and C to R Does the Check power resistance check Allow compressor...

  • Page 21: Section 16. Refrigeration Circuits

    SECTION 16. Refrigeration Circuits 6018 & 6024 Models PRINTED FROM D157394P01 6030 & 6036 Models PRINTED FROM D158514P01 88-M4PW003-1B-EN...
  • Page 22 6042 PRINTED FROM D156020 88-M4PW003-1B-EN...
  • Page 23 6048 Printed from D159175 88-M4PW003-1B-EN...
  • Page 24 About Trane and American Standard Heating and Air Conditioning Trane and American Standard create comfortable, energy efficient indoor environments for residential applications. For more information, please visit www.trane.com or www.americanstandardair.com The AHRI Certified mark indicates company participation in the AHRI Certification program. For verification of individual certified products, go to ahridirectory.org.

This manual is also suitable for:

M4ac6018a1000aM4ac6024a1000aM4ac6030a1000aM4ac6036a1000aM4ac6042a1000aM4ac6048a1000a

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