TRANE A5AC4042A Condensing Units Air Conditioner Systems Instruction Manual

TRANE A5AC4042A Condensing Units Air Conditioner Systems

Product Information

• The product is a condensing unit available in various models: A5AC4018A, A5AC4024A, A5AC4030A, A5AC4036A, A5AC4042A, A5AC4048A, and A5AC4060A. The actual appearance of the model may differ from the graphics shown in the document.
• It is important to note that all phases of the installation must comply with national, state, and local codes to ensure safety.
• The installation, starting up, and servicing of this heating, ventilating, and air-conditioning equipment should only be performed by qualified personnel. Improper installation or servicing by unqualified individuals can result in death or serious injury. It is crucial to observe all precautions mentioned in the literature and on the tags, stickers, and labels attached to the equipment.
• The product uses R454B refrigerant, which is a blend. It should only be added to the system in liquid form.
• The condensing unit contains hazardous voltage, and it is essential to disconnect all electric power, including remote disconnects, before servicing. Following proper lockout/tagout procedures ensures that the power cannot be inadvertently energized.
• Touching the top of the compressor can cause hot surface burns. Therefore, it is important to avoid touching it to prevent property damage or personal injury.
• The refrigerant used in the unit is flammable, and any repairs should only be carried out by trained service personnel. Puncturing refrigerant tubing or failing to dispose of it properly can result in fire risk. It is crucial to follow federal or local regulations for proper disposal.
• If using mechanical connections, brazing is required. Failing to inspect lines or use proper service tools may lead to equipment damage or personal injury. If existing refrigerant lines are used, ensure that all joints are brazed, not soldered.
• When opening the system, it is important to recover refrigerant to relieve pressure before proceeding. Failure to follow proper procedures can result in personal illness or injury, as the system contains oil and refrigerant under high pressure.
• All parts of the product that are capable of conducting electrical current are grounded, and proper grounding is required. If grounding wires or other components are removed for service, they must be returned to their original position and properly fastened to avoid equipment damage or personal injury.
• Extreme caution should be exercised when opening the suction and liquid line service valves. Failure to follow this warning can result in an abrupt release of the system charge, leading to personal injury and/or property damage. The valve stem should be turned counterclockwise until it contacts the rolled edge without applying torque.
• Before connecting the electrical supply, it is essential to ensure an earth connection. Failure to do so can result in high leakage current, which can cause property damage, severe personal injury, or death.

Product Usage Instructions

1. Ensure that the installation of the condensing unit complies with all national, state, and local codes for safety.
2. Only allow qualified personnel to perform the installation, starting up, and servicing of the equipment.
3. Add R454B refrigerant to the system in liquid form only.
4. Disconnect all electric power, including remote disconnects, before servicing the unit.
5. Follow proper lockout/tagout procedures to prevent inadvertent energization of power.
6. Avoid touching the top of the compressor to prevent hot surface burns.
7. Do not attempt to repair the unit unless you are a trained service personnel.
8. Dispose of refrigerant properly according to federal or local regulations.
9. If using mechanical connections, ensure that the brazing is performed and inspect lines for any issues.
10. Recover refrigerant to relieve pressure before opening the system.
11. Inspect and reconnect all grounding devices during servicing.
12. Exercise extreme caution when opening the suction and liquid line service valves.
13. Ensure proper earth connection before connecting the electrical supply.

Installation and Operation Manual
ALL phases of this installation must comply with NATIONAL, STATE AND LOCAL CODES

IMPORTANT
This Document is customer property and is to remain with this unit. Please return to service information pack upon completion of work.

These instructions do not cover all variations in systems or provide for every possible contingency to be met in connection with the installation. Should further information be desired or should particular problems arise which are not covered sufficiently for the purchaser’s purposes, the matter should be referred to your installing dealer or local distributor.

Note:
The manufacturer recommends installing only approved matched indoor and outdoor systems. All of the manufacture’s split systems are AHRI-rated only with TXV/EEV indoor systems. Some of the benefits of installing approved matched indoor and out-door split systems are maximum efficiency, optimum performance and the best overall system reliability.

Models

• A5AC4018A
• A5AC4024A
• A5AC4030A
• A5AC4036A
• A5AC4042A
• A5AC4048A
• A5AC4060A

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. 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.

NOTE:
R454B refrigerant is a blend and should only be added to the system in liquid form.

WARNING

HAZARDOUS VOLTAGE!
Failure to follow this Warning could result in property damage, severe personal injury, or death. Disconnect all electric power, including remote disconnects before servicing. Follow proper lockout/tagout procedures to ensure the power cannot be inadvertently energized.

REFRIGERANT OIL!

• Any attempt to repair a central air conditioning product may result in property damage, severe personal injury, or death.
• Use only R-454B approved service equipment. All 454B systems with variable speed compressors use variable speed compressor oil that readily absorbs moisture from the atmosphere. To limit this ‘hygroscopic’ action, the system should remain sealed whenever possible. If a system has been open to the atmosphere for more than 4 hours, the compressor oil must be replaced. Never break a vaccum with air and always change the driers when opening the system for component replacement.

CAUTION

HOT SURFACE!
May cause minor to severe burning. Failure to follow this Caution could result in property damage or personal injury. Do not touch top of the compressor.

RISK OF FIRE!

• Flammable refrigerant used. To be repaired only by trained service personnel. Do not puncture refrigerant tubing.
• Dispose of properly in accordance with federal or local regulations. Flammable refrigerant used.

WARNING

BRAZING REQUIRED – IF USING MECHANICAL CONNECTIONS, ENSURE THE LEAK TEST IS NEGATIVE!
Failure to inspect lines or use proper service tools may result in equipment damage or personal injury. If using existing refrigerant lines make certain that all joints are brazed, not soldered.

CAUTION

CONTAINS REFRIGERANT!

• Failure to follow proper procedures can result in personal illness or injury or severe equipment damage.
• System contains oil and refrigerant under high pressure. Recover refrigerant to relieve pressure before opening the system.

GROUNDING REQUIRED!
Failure to inspect or use proper service tools may result in equipment damage or personal injury. Reconnect all grounding devices. All parts of this product that are capable of conducting electrical current are grounded. If grounding wires, screws, straps, clips, nuts, or washers used to complete a path to the ground are removed for service, they must be returned to their original position and properly fastened.

WARNING

SERVICE VALVES!
Failure to follow this warning will result in abrupt re-lease of the system charge and may result in personal in-jury and/or property damage. Extreme caution should be exercised when opening the Suction and Liquid Line Service Valve. Turn the valve stem counterclockwise only until the stem contacts the rolled edge. No torque is required.

HIGH LEAKAGE CURRENT!

• Failure to follow this warning could result in property damage, severe personal injury, or death.
• The earth connection is essential before connecting the electrical supply.

VENTILATION
Ensure that the area is in the open or that it is adequately ventilated before breaking into the system or conducting any hot work.

Important:
If using other than copper pipe, follow the manufacturer’s installation instructions. Joints must be brazed or another UL/IMC/URMC-approved joint that meets pressure requirements.

Unit Location Considerations

Unit Dimensions and Weight

Unit Dimensions and Weight

Models| H x D x W (in)| Weight* (lb)
A5AC4018A| 36.6 x 29.8 x 29.8| 184
A5AC4024A| 32.6 x 29.8 x 29.8| 161
A5AC4030A| 36.6 x 29.8 x 29.8| 184
A5AC4036A| 32.6 x 29.8 x 29.8| 161
A5AC4042A| 36.6 x 34.3 x 34.3| 212
A5AC4048A| 44.3 x 34.3 x 34.3| 252
A5AC4060A| 44.3 x 34.3 x 34.3| 252

• Weight values are estimated.

When mounting the outdoor unit on a roof, be sure the roof will support the unit’s weight. Properly selected isolation is recommended to alleviate sound or vibration transmission to the building structure.

Refrigerant Piping Limits

1. The maximum TOTAL length of refrigerant lines from outdoor to indoor unit should NOT exceed 150 feet* (including lift).
2. The maximum vertical change should not exceed 50 feet*.
3. Standard and alternate line sizes and service valve connection sizes are shown in Table 5.1.

See Table 5.1 for exceptions for certain tonnages.

Note:
For other line lengths, Refer to Refrigerant Piping Application Guide, SS- APG006F-EN, or Refrigerant Piping Software Program.

Suggested Locations for Best Reliability

• Ensure the top discharge area is unrestricted for at least five (5) feet above the unit.
• Three (3) feet clearance must be provided in front of the control box (access panels) and any other side requiring service.
• It is not recommended to install in a location where noise may distract the building occupants. Some examples of these types of locations are sleeping quarters and by windows of a living area. Please discuss location with the building owner prior to installation.
• Avoid locations such as near windows where condensation and freezing defrost vapor can annoy a customer.
• Position the outdoor unit a minimum of 12” from any wall or surrounding shrubbery to ensure adequate airflow.
• Outdoor unit location must be far enough away from any structure to prevent excess roof runoff water or icicles from falling directly on the unit.

Cold Climate Considerations

NOTE:
It is recommended that these precautions be taken for units being installed in areas where snow accumu-lation and prolonged below freezing temperatures occur.

• Units should be elevated 3-12 inches above the pad or roof top, depending on local weather. This additional height will allow drainage of snow and ice melted during defrost cycle prior to its refreezing. Ensure that drain holes in unit base pan are not obstructed preventing draining of defrost water.
• If possible, avoid locations that are likely to accumulate snow drifts. If not possible, a snow drift barrier should be installed around the unit to prevent a build-up of snow on the sides of the unit.

Unit Preparation

Prepare The Unit For Installation

• STEP 1 – Check for damage and report promptly to the carrier any damage found to the unit.

Setting the Unit

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.
• The pad must be level.
• The pad should be high enough above grade to allow for drainage.
• The pad location must comply with National, State, and Local codes.

For other applications refer to application guide.

Refrigerant Line Considerations

Refrigerant Line and Service Valve Connection Sizes

RATED LINE SIZES

| Line Sizes| Service Valve Connection Sizes| Max Line & Lift Lengths
---|---|---|---
Vapor Line| Liquid Line| Vapor Line Connection| Liquid Line Connection| TOTAL Max

Line Length (ft.)

| Max Lift (ft.)
A5AC4018A| 3/4| 5/16| 3/4| 5/16| 150| 50
A5AC4024A| 3/4| 5/16| 3/4| 5/16| 150| 50
A5AC4030A| 3/4| 5/16| 3/4| 5/16| 150| 50
A5AC4036A| 3/4| 5/16| 3/4| 5/16| 150| 50
A5AC4042A| 7/8| 5/16| 7/8| 5/16| 150| 50
A5AC4048A| 7/8| 5/16| 7/8| 5/16| 150| 50
A5AC4060A| 7/8| 5/16| 7/8| 5/16| 150| 50

Note:
For other line lengths, Refer to Refrigerant Piping Application Guide, SS- APG006F-EN, or Refrigerant Piping Software Program.

Factory Charge
The outdoor condensing units are factory charged with the system charge required for the outdoor condensing unit, ten (10) feet of tested connecting line, and the smallest rated indoor evaporative coil match. Always verify proper system charge via subcooling (TXV/EEV) or superheat (fixed orifice) per the unit nameplate.

Required Refrigerant Line Length
Determine required line length and lift. You will need this later in STEP 2 of Section 14.

• Total Line Length = __ Ft.
• Total Vertical Change (lift) = __ Ft.

Refrigerant Line Insulation

Important:
The Vapor Line must always be insulated. DO NOT allow the Liquid Line and Vapor Line to come in direct (metal to metal) contact.

Reuse Existing Refrigerant Lines

CAUTION
If using existing refrigerant lines make certain that all joints are brazed, not soldered.

For retrofit applications, where the existing indoor evaporator coil and/or refrigerant lines will be used, the following precautions should be taken:

• Ensure that the indoor evaporator coil and refrigerant lines are the correct size.
• Ensure that the refrigerant lines are free of leaks, acid, and oil.

Refrigerant Line Routing

Precautions

Important:

• Take precautions to prevent noise within the building structure due to vibration transmission from the refrigerant lines.
• Comply with National, State, and Local Codes when isolating line sets from joists, rafters, walls, or other structural elements.

For Example:

• When the refrigerant lines have to be fastened to floor joists or other framing in a structure, use isolation-type hangers.
• Isolation hangers should also be used when refrigerant lines are run in stud spaces or enclosed ceilings.
• Where the refrigerant lines run through a wall or sill, they should be insulated and isolated.
• Isolate the lines from all ductwork.
• Minimize the number of 90º turns.

Refrigerant Line Brazing

Braze The Refrigerant Lines

• STEP 1 – Remove caps or plugs. Use a deburing tool to debur the pipe ends. Clean both internal and external surfaces of the tubing using an emery cloth.

• 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 nitrogen purge. Braze the refrigerant lines to the service valves.
  Continue the dry nitrogen purge. Do not remove the wet rag until all brazing is completed.
  Important: Remove the wet rag before stopping the dry nitrogen purge.
  Note: Install drier in Liquid Line.
  NOTE: Precautions should be tak Precautions should be taken to aen to avvoid heat damage to basepan duroid heat damage to basepan during bring brazing.azing. It is recommended to It is recommended to kkeep the flame directly off of the basepan.eep the flame directly off of the basepan.

• STEP 5 – Replace the pressure tap valve cores after the service valves have cooled.

Refrigerant Line Leak Check

Check For Leaks

• STEP 1 – Pressurize the refrigerant lines and evaporator coil to 600 PSIG using dry nitrogen.
• STEP 2 – Check for leaks by using a soapy solution or bubbles at each brazed location.
• Note: Remove nitrogen pressure and repair any leaks before continuing.

After completion of field piping for split systems, the field pipework shall be pressure tested with nitrogen and then vacuum tested prior to refrigerant charging, according to the following requirements:

1. The minimum leak test pressure of the line set and indoor coil shall be the high side design pressure, unless the high side of the system, cannot be isolated from the low side of the system in which case the entire system shall be pressure tested to the low side design pressure.
2. The test pressure after removal of the pressure source shall be maintained for at least 1 hour with no decrease of pressure indicated by the test gauge, with test gauge resolution not exceeding 5% of the test pressure.

Important:

• Important: Under no circumstances shall potential sources of ignition be used in the search for or detection of refrigerant leaks.
• Important: The following leak detection methods are deemed acceptable for all refrigerant systems:
  • Electronic leak detectors calibrated for R454B
  • Bubble method

Evacuation and Servicing

Evacuate the Refrigerant Lines and Indoor Coil

Important:
Do not open the service valves until the refrigerant lines and indoor coil leak check and evacuation are complete.

• STEP 1 – Evacuate until the micron gauge reads no higher than 350 microns, then close off the valve to the vacuum pump.
• STEP 2 – Observe the micron gauge. Evacuation is complete if the micron gauge does not rise above 500 microns in one (1) minute and 1500 microns in ten (10) minutes.
• STEP 3 – Once evacuation is complete, blank off the vacuum pump and micron gauge, and close the valve on the manifold gauge set.

Under no circumstances shall potential sources of ignition be used in the search for or detection of refrigerant leaks.

The following leak detection methods are deemed acceptable for all refrigerant systems:

• Electronic leak detectors calibrated for R454B
• Bubble method
• Fluorscent method agents

If a leakage of refrigerant is found that requires brazing, all of the refrigerant shall be recovered from the system, or isolated (by means of shut- off valves) in a part of the system remote from the leak.

Servicing

• If repairs must be made after the system is charged, properly and safely remove or isolate refrigerant and purge the section of the system needing repair with Nitrogen gas or oxygen-free nitrogen prior to opening the circuit.
• The REFRIGERANT CHARGE shall be recovered into the correctly marked recovery cylinders.
• Ensure that the outlet for the vacuum pump is not close to any potential ignition sources and the ventilation is available.
• Prior to recharging the system, it shall be pressure-tested with the appropriate purging gas. The system shall be leak-tested on completion of charging but prior to commissioning. A follow-up leak test shall be carried out prior to leaving the site.
• Ensure that only appropriate refrigerant recovery cylinders are employed. Ensure that the correct number of cylinders for holding the total system charge is available. Only use cylinders designated for the recovered refrigerant and labeled for the refrigerant. Cylinders shall be complete with pressure-relief valve and associated shut-off valves in good working order.
• A set of calibrated weighing scales shall be available and in good working order. Hoses shall be complete with leak-free disconnect couplings and in good condition. Ensure any associated electrical components are sealed.
• The recovered refrigerant shall be returned to the refrigerant supplier in the correct recovery cylinder. Do not mix refrigerants.
• If compressors or compressor oils are to be removed, ensure that they have been evacuated to an acceptable level to make certain that FLAMMABLE REFRIGERANT does not remain within the lubricant.

Service Valves

Open the Gas Service Valve

• Important: Leak check and evacuation must be completed before opening the service valves.
• NOTE: Do not vent refrigerant gases into the atmosphere.
• STEP 1 – Remove the valve stem cap.
• STEP 2 – Using an adjustable wrench, turn the valve stem 1/4 and turn counterclockwise to the fully open position. STEP 3 – Replace the valve stem cap to prevent leaks. Tighten finger tight plus an additional 1/6 turn.

Open the Liquid Service Valve

WARNING
Extreme caution should be exercised when opening the Liquid Line Service Valve. Turn counterclockwise until the valve stem just touches the rolled edge. No torque is required. Failure to follow this warning will result in abrupt release of the system charge and may result in personal injury and /or property damage.

Important:
Leak check and evacuation must be completed before opening the service valves.

• STEP 1 – Remove the service valve cap.
• STEP 2 – Fully insert a 3/16” hex wrench into the stem and back out counterclockwise until the valve stem just touches the rolled edge (approximately five (5) turns.)
• STEP 3 – Replace the valve cap to prevent leaks. Tighten finger tight plus an additional 1/6 turn.

Mitigation Board Guidelines

• The approved ID/OD combination will provide sufficient safe ventilation in case of a leak.
• Refer Indoor Unit Installer’s Guide for correct specifications on indoor unit install.
• All systems require mitigation boards so on altitude adjustment factors required.
• MCB neds to be included in an A2L System.

Electrical – Low Voltage

Low Voltage Maximum Wire Length
Defines the maximum total length of low voltage wiring from the outdoor unit, to the indoor unit, and to the thermostat.

24 VOLTS

WIRE SIZE| MAX. WIRE LENGTH
18 AWG| 150 Ft.
16 AWG| 225 Ft.
14 AWG| 300 Ft.

Low Voltage Hook-up Diagrams

• Units with pigtails require wirenuts for connections. Cap all unused wires.
• In AC systems for multiple stages of electric heat, jumper W1 and W2 together if comfort control has only one stage of heat.
• TEM3/4 – Bypass air handler and connect Y from comfort control directly to OD unit
  • TEM6 Only
  • TEM6 only – When using a BK-enabled comfort control, cut BK jumper and bypass Y1 and Y2 at the air handler. Connect BK from comfort control to BK of the air handler
• TAM4 only – Wire as shown, no BK is available
• TAM7 only – When using a BK-enabled comfort control, cut BK jumper on the AFC and connect BK from comfort control to BK of the air handler

• Units with pigtails require wirenuts for connections. Cap all unused wires.
• In AC systems for multiple stages of heat, jumper W1 and W2 together if comfort control has only one stage of heat.
  • If equipped with second-stage heat
  • When using a BK-enabled comfort control, cut the BK jumper and bypass Y and YLo at the furnace. Connect BK from comfort control to BK of the furnace

Electrical – High Volta ge

High Volta ge Power Supply

WARNING

LIVE ELECTRICAL COMPONENTS!
During installation, testing, servicing, and troubleshooting of this product, it may be necessary 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.

High Voltage Disconnect Switch

• Install a separate disconnect switch at the outdoor unit.
• For high voltage connections, flexible electrical conduit is recommended whenever vibration transmission may create a noise problem within the structure.

High Voltage Ground
Ground the outdoor unit per national, state, and local code requirements.

Start-Up

System Start-Up

• STEP 1 – Ensure Sections 7 through 12 have been completed.
• STEP 2 – Set System Thermostat to OFF.
• STEP 3 – Turn on disconnect(s) to apply power to the indoor and outdoor units.
• STEP 4 – Wait for one (1) hour before starting the unit if the compressor crankcase heater accessory is used and the Outdoor Ambient is below 70ºF.
• STEP 5 – Set the system thermostat to ON.

System Charge Adjustment

System Charge Adjustment (Systems can be rated with TXV, EEV or Piston)

NOTE:
For systems using an indoor piston metering device, refer to the Superheat charging method and chart. For systems using a TXV or EEV indoor metering device, refer to the Subcool charging method and charts.

Temperature Measurements

• STEP 1 – Check the outdoor temperatures.
  • Subcooling (in cooling mode) is the only recommended method of charging above 55º F ambient outdoor temperature.
  • Note: For Superheat (In Cooling Mode), refer to the Superheat Charging Table
  • For best results, the indoor temperature should be kept between 70º F to 80º F.
  • Note: It is important to return in the spring or summer to accurately charge the system in the cooling mode when the outdoor ambient temperature is above 55º F.

Subcooling Charging in Cooling (Above 55º F Outdoor Temp.)

• STEP 1 – Use the refrigerant line total length and lift measurements from Section 5 and use line length adders as shown in Section 5.2 if required.

  • Total Line Length = __ Ft.
  • Vertical Change (Lift) = __ Ft.
    Note: Use this method when matched with a TXV or EEV indoor unit.

• STEP 2 – Determine the final subcooling value using total Line Length and Lift measured in STEP 1 and the charts below.

• Design Subcooling Value = __º F
  (from nameplate or Service Facts)

• Final Subcooling Value = __º F

• Subcooling Correction = __º F

Charging the Unit

• STEP 1 – Attain Proper Gage Pressure.
  Using the Standard R-454B Subcool Charging Chart, adjust the refrigerant level to attain proper gage pressure.

  • Note: Use bubble point, per the included chart, for calculating subcooling.
    Add refrigerant in the Liquid Gage Pressure is lower than the chart value.
  1. Connect gauges to refrigerant bottle and unit are illustrated.
  2. Purge all hoses.
  3. Place the refrigerant bottle on a scale and then open the bottle.
  4. Stop adding refrigerant when liquid line refrigerant and Liquid gauge pressure match the charging chart.
  • Note: Recover refrigerant if the Liquid gauge pressure is higher than the chart value.
  • Note: Ensure that contamination of different refrigerants does not ___ when using charging equipment. Cylinders will be kept in an appropriate position according to the instructions. Ensure that the REFRIGERATING SYSTEM is either prior to charging the system with refrigerant.

• STEP 2 – Stabilize the system.

1. Wait 20 minutes for the system condition to stabilize between adjustments.  

Note: When the Liquid Line Temperature and Gage Pressure approximately match the chart, the system is properly charged.

2. Remove gages.
3. Replace service port caps to prevent leaks. Tighten finger tight plus an additional 1/6 turn.

• STEP 3 – Record System Information for reference. Record system pressures and temperatures after charging is complete.
  • Outdoor model number = _____
  • Measured Outdoor Ambient = __ º F
  • Measured Indoor Ambient = __ º F
  • Measured Liquid Line Temp = __ º F
  • Measured Suction Line Temp = __ º F
  • Liquid Gage Pressure = __ PSI
  • Suction Gage Pressure = __ PSI
• STEP 4 – Complete the ‘Total System Charge’ charge rating label below and label located on the outside of the unit with a permanent marker.
  • Charge added at Factory = ___ lb/oz
  • Charge added at install = ___ lb/oz
  • Total System Charge (a + b) = ___ lb/oz

Fixed Orifice Superheat Charging Table

Outdoor Dry Bulb Temp. (F)

|  | 50| 51| 52| 53| 54| 55| 56| 57| 58| 59| 60| 61| 62| 63| 64| 65| 66| 67| 68| 69| 70| 71| 72| 73| 74| 75| 76| 77| 78
55| 7| 9| 10| 11| 12| 14| 15| 17| 18| 20| 21| 23| 24| 26| 27| 29| 30|  |  |  | |  |  |  |  |  |  |  |
60| 5| 7| 8| 9| 10| 12| 13| 15| 16| 18| 19| 21| 22| 24| 25| 27| 28| 30| 31|  | |  |  |  |  |  |  |  |
65|  |  | 4| 6| 8| 10| 11| 13| 14| 16| 17| 18| 19| 21| 22| 24| 25| 27| 28| 27| 31|  |  |  |  |  |  |  |
70|  |  |  |  | 5| 7| 8| 10| 11| 13| 14| 16| 17| 18| 19| 21| 22| 24| 25| 27| 28| 30| 31|  |  |  |  |  |
75|  |  |  |  |  |  | 5| 6| 7| 9| 10| 12| 14| 16| 18| 19| 21| 22| 24| 26| 28| 29| 31| 32|  |  |  |  |
80|  |  |  |  |  |  |  |  | 4| 6| 7| 9| 10| 11| 12| 14| 16| 18| 19| 21| 23| 25| 26| 28| 29| 31| 33|  |
85|  |  |  |  |  |  |  |  |  |  | 4| 6| 7| 9| 10| 13| 14| 16| 18| 20| 21| 23| 24| 26| 28| 29| 30| 31| 32
90|  |  |  |  |  |  |  |  |  |  |  |  | 4| 6| 8| 10| 11| 13| 14| 16| 18| 20| 22| 24| 25| 27| 28| 30| 31
95|  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4| 6| 8| 10| 13| 14| 16| 18| 20| 22| 23| 25| 26| 28| 29
100|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6| 8| 10| 12| 13| 16| 18| 20| 21| 23| 25| 27| 29
105|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4| 6| 7| 9| 11| 13| 15| 18| 20| 22| 24| 26| 28
110|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4| 7| 9| 11| 13| 16| 18| 21| 23| 26| 28

115

|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | ****

6

| ****

9

| ****

12

| ****

14

| ****

16

| ****

19

| ****

21

| ****

24

| ****

26

Using a digital psychrometer, measure the return air wet-bulb temperature at the unit just before the coil. Also measure the outdoor dry-bulb tem- perature. Use these temperatures to locate the target superheat on the charging table. Do not attempt to charge the system if these conditions fall outside of this charging table.

ADD refrigerant to DECREASE total superheat. REMOVE refrigerant to INCREASE total superheat. Always allow 10 to 15 minutes of operature after any refrigerant or air flow change prior to determining the final superheat.

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.

Calculating Charge Using the Weigh-In Method

• STEP 1 – Measure in feet the distance between the outdoor unit and the indoor unit and record on Line 1. Include the entire length of the line from the service valve to the IDU.
• STEP 2 – Enter the charge multiplier (0.4 oz/ft). Each linear foot of interconnecting tubing requires the addition of 0.4 oz of refrigerant.
• STEP 3 – Multiply the total length of refrigerant tubing (Line 1) times the value on Step 2. Record the result on Line 3 of the Worksheet.
• STEP 4 – This is the amount of refrigerant to weigh-in prior to opening the service valves.

1. Line length (ft) __
2. Charge multiplier x 0.4 __
3. Step 1 x Step 2 = _____
4. Refrigerant = _____

STEP 5
Complete the ‘Total System Charge’ charge rating label below and label located on the outside of the unit with a permanent marker.

Note:
Complete the ‘Total System Charge’ chart when fi nal charging is complete.

• Charge added at Factory = ___ lb/oz
• Charge added at install = ___ lb/oz
• Total System Charge (a + b) = ___ lb/oz

STEP 6
Return to site for adjustment.

Important:
Return in the spring or summer to accurately charge the system in the cooling mode with outdoor ambient above 55º F.

Checkout Procedures

Operational And Checkout Procedures

Final phases of this installation are the unit Operational and Checkout Procedures. To obtain proper performance, all units must be operated and charge adjustments made.

Important:
Perform a final unit inspection to be sure that factory tubing has not shifted during shipment. Adjust tubing if nec-essary so tubes do not rub against each other when the unit runs. Also be sure that wiring connections are tight and properly secured.

CHECKOUT PROCEDURE
After installation has been completed, it is recommended that the entire system be checked against the following list:

1. Leak check refrigerant lines. …………………………………. [ ]
2. Properly insulate suction lines and fittings. ………………. [ ]
3. Properly secure and isolate all refrigerant lines. ……….. [ ]
4. Seal passages through masonry. If mortar is used, prevent mortar from coming into direct contact with copper tubing. …………………….. [ ]
5. Verify that all electrical connections are tight. …………… [ ]
6. Observe outdoor fan during on cycle for clearance and smooth operation. ………………………………………….. [ ]
7. Be sure that indoor coil drain line drains freely. Pour water into drain pan. ……………………………………………………… [ ]
8. Be sure that supply registers and return grilles are open and unobstructed. ………………………………………………… [ ]
9. Be sure that a return air filter is installed. ………………… [ ]
10. Be sure that the correct airflow setting is used. (Indoor blower motor) …………………………………………… [ ]
11. Operate complete system in each mode to ensure safe operation. ………………………………………….. [ ]

Refrigeration Circuits

018, 030 & 042 Models

024 & 036 Models

048 & 060 Models

Wiring Diagrams

018 – 048 Models

018 – 048 Models

060 Models

060 Models

Pressure Curves

PRESSURE CURVES (Refer below table for models)

COOLING PERFORMANCE CAN BE CHECKED WHEN THE OUTDOOR TEMP IS ABOVE 65 DEG F.
TO CHECK COOLING PERFORMANCE, SELECT THE PROPER INDOOR CFM, ALLOW PRESSURES TO STABILIZE. MEASURE INDOOR WET BULB TEMPERATURE, OUTDOOR TEMPERATURE, LIQUID AND SUCTION PRESSURES. ON THE PLOTS LOCATE OUTDOOR TEMPERATURE (1); LOCATE INDOOR WET BULB (2); FIND INTERSECTION OF OD TEMP. & ID W.B. (3); READ LIQUID (4) OR SUCTION (5) PRESSURE IN LEFT COLUMN .

EXAMPLE:

1. OUTDOOR TEMP. 82 F.
2. INDOOR WET BULB 67 F.
3. AT INTERSECTION
4. LIQUID PRESSURE @ 600 CFM IS 286 PSIG
5. SUCTION PRESSURE @ 600 CFM IS 143 PSIG

ACTUAL:
LIQUID PRESSURE SHOULD BE +/- 10 PSI OF CHART SUCTION PRESSURE SHOULD BE +/- 3 PSIG OF CHART

PRESSURE CURVES (Refer below table for models)

COOLING PERFORMANCE CAN BE CHECKED WHEN THE OUTDOOR TEMP IS ABOVE 65 DEG F.
TO CHECK COOLING PERFORMANCE, SELECT THE PROPER INDOOR CFM, ALLOW PRESSURES TO STABILIZE. MEASURE INDOOR WET BULB TEMPERATURE, OUTDOOR TEMPERATURE, LIQUID AND SUCTION PRESSURES. ON THE PLOTS LOCATE OUTDOOR TEMPERATURE (1); LOCATE INDOOR WET BULB (2); FIND INTERSECTION OF OD TEMP. & ID W.B. (3); READ LIQUID (4) OR SUCTION (5) PRESSURE IN LEFT COLUMN .

EXAMPLE:

1. OUTDOOR TEMP. 82 F.
2. INDOOR WET BULB 67 F.
3. AT INTERSECTION
4. LIQUID PRESSURE @ 600 CFM IS 300 PSIG
5. SUCTION PRESSURE @ 600 CFM IS 143 PSIG

ACTUAL:
LIQUID PRESSURE SHOULD BE +/- 10 PSI OF CHART SUCTION PRESSURE SHOULD BE +/- 3 PSIG OF CHART.

PRESSURE CURVES (Refer below table for models)

COOLING PERFORMANCE CAN BE CHECKED WHEN THE OUTDOOR TEMP IS ABOVE 65 DEG F.
TO CHECK COOLING PERFORMANCE, SELECT THE PROPER INDOOR CFM, AND ALLOW PRESSURES TO STABILIZE. MEASURE INDOOR WET BULB TEMPERATURE, OUTDOOR TEMPERATURE, LIQUID AND SUCTION PRESSURES. ON THE PLOTS LOCATE OUTDOOR TEMPERATURE (1); LOCATE INDOOR WET BULB (2); FIND THE INTERSECTION OF OD TEMP. & ID W.B. (3); READ LIQUID (4) OR SUCTION (5) PRESSURE IN LEFT COLUMN.

EXAMPLE:

1. OUTDOOR TEMP. 82 F.
2. INDOOR WET BULB 67 F.
3. AT INTERSECTION
4. LIQUID PRESSURE @ 600 CFM IS 313 PSIG
5. SUCTION PRESSURE @ 600 CFM IS 134 PSIG

ACTUAL:
LIQUID PRESSURE SHOULD BE +/- 10 PSI OF CHART SUCTION PRESSURE SHOULD BE +/- 3 PSIG OF CHART.

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The manufacturer has a policy of continuous data improvement and it reserves the right to change design and specifications without notice. We are committed to using environmentally conscious print practices.

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