TRANE A4HP5024D1000A Split System Heat Pump Instruction Manual

TRANE A4HP5024D1000A Split System Heat Pump Instruction Manual

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 precautions in the literature and on the tags, stickers, and labels that are attached to the equipment.

SAFETY SECTION

Important — This document contains service information. This is customer property and is to remain with this unit. Please return to service information pack upon completion of work.

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.

WARNING

REFRIGERANT OIL!

Failure to follow this Warning could result in property damage, severe personal injury, or death. These units use R-410A refrigerant which operates

at 50–70% higher pressures than R-22. Use only R410A approved service equipment. Refrigerant cylinders are painted a “Rose” color to indicate the type of refrigerant and may contain a “dip” tube to allow for charging of liquid refrigerant into the system. All R-410A systems use a POE oil that readily absorbs moisture from the atmosphere. To limit this “hydroscopic” 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 vacuum with air and always change the driers when opening the system for component replacement. For specific handling concerns with R-410A and POE oil, reference Retrofit Bulletin TRN-APG02–EN.

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 compressor.

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 system.

CAUTION

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 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 release of system charge and may result in personal injury and/or property damage. Extreme caution should be exercised when opening the Suction and Liquid Line Service Valve. Turn valve stem counterclockwise only until the stem contacts the rolled edge. No torque is required.

WARNING

BRAZING REQUIRED — IF USING MECHANICAL CONNECTIONS, ENSURE 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.

WARNING

Warning!

This product can expose you to chemicals including lead which are known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca. gov

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

Product Specifications

(a) Certified in accordance with the Air-Source Unitary Air-conditioner Equipment certification program, which is based on AHRI standard 210/240.
(b) Rated in accordance with AHRI standard 270.
(c) Calculated in accordance with Natl. Elec. Codes. Use only HACR circuit breakers or fuses.
(d) This value shown for compressor RLA on the unit nameplate an  on this specification sheet is used to compute minimum branch circuit ampacity and max. fuse size. The value shown is the branch circuit  selection current.
(e) No means no start components. Yes means quick start kit components. Optional Authorized Kits include KIT07689 for RunTru or BAYKSKT267.
(f) Standard Air – Dry Coil – Outdoor
(g) This value approximate. For more precise value see unit nameplate.
(h) Reference the outdoor unit ship-with literature for refrigerant piping length and lift guidelines. Reference the refrigerant piping software pub # 32-3312-xx or refrigerant piping application guide SSAPG006-xx for long line sets or specialty applications (xx denotes latest revision).
(i) 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.

Wiring Diagrams

NOTES:

1.  BE SURE POWER SUPPLY AGREES WITH EQUIPMENT NAMEPLATE.
2. OWER WIRING AND GROUNDING OF EQUIPMENT MUST COMPLY WITH LOCAL CODES.
3. LOW VOLTAGE WIRING TO BE NO. 18 AWG MINIMUM CONDUCTOR.
4. ODT-B MUST BE SET LOWER THAN ODT-A

ACR A/C RECTIFIER COIL BOTTOM SENSOR CBS
CF FAN CAPACITOR
CN WIRE CONNECTOR COMPRESSOR
CPR CR RUN CAPACITOR
CS STARTING CAPACITOR
CSR CAPACITOR SWITCHING RELAY
DFC DEFROST CONTROL ELECTRONIC EXP VALVE
EEV EEVC ELECTRONIC EXP VALVE CONTROL
F INDOOR FAN RELAY
HPCO HIGH PRESSURE CUTOUT SWITCH
IOL INTERNAL OVERLOAD PROTECTOR
LPCO LOW PRESSURE CUTOUT SWITCH COMPRESSOR MOTOR CONTACTOR
NS ODA OUTDOOR ANTICIPATOR
OFT OUTDOOR FAN THERMOSTAT
ODS OUTDOOR TEMPERATURE SENSOR
ODT OUTDOOR THERMOSTAT P-TRD PRESSURE TRANSDUCER
SC SWITCH OVER VALVE SOLENOID
SM SYSTEM ON-OFF SWITCH DISCHARGE LINE THERMOSTAT
TDL TDR TIME DELAY RELAY (5 SEC DELAY ON1
TNS TRANSFORMER
TEMP SENSOR. TEMPERATURE
Y2C HIGH CAPACITY CONTROL RELAY

POL PLUG FEMALE HOUSING (MALE TERMINALS)
POL PLUG MALE HOUSING (FEMALE TERMINALS)

Figure 2. 1.5, 2.0 & 2.5 Ton Models

LEGEND

24 V FIELD LINE WIRING
LINE WIRING
FIELD INSTALLED FACTORY WIRING
MAGNETIC COIL
GROUND
JUNCTION
CAPACITOR
 WIRE NUT OR
TERMINAL
TRANSFORMER
FUSE
TERMINAL BLOCK/BOARD
RELAY CONTACT (N.0)
RELAY CONTACT (N.C)
THERMISTOR
TEMP ACTUATED SWITCH
INTERNAL OVERLOAD PROTECTION
PRESSURE ACTUATED SWITCH
RESISTER OR HEATING ELEMENT
MOTER WINDING

WARNING

HAZARDOUS VOLTAGE!

DISCONNECT ALL ELECTRICAL POWER INCLUDING REMOTE DISCONNECTS BEFORE SERVICING. Failure to disconnect power before servicing can cause severe. personal injury or death.

CAUTION

USE COPPER CONDUCTORS ONLY! UNIT TERMINALS ARE NOT DESIGNED TO ACCEPT OTHER TYPES OF CONDUCTORS. Failure to do so may cause damage to the equipment.

FOR CANADIAN INSTALLATIONS

CAUTION: NOT SUITABLE FOR USE ON POUR INSTALLATIONS CANADIENNES SYSTEMS EXCEEDING 150V-TO-GROUND ATTENTION: NE CONVIENT PAS AUX INSTALLATIONS DE PLUS DE 150 V A LA TERRE

Subcooling Charging in Cooling between 55° F and 120°  OD Ambient

The manufacturer has always recommended installing approved matched indoor and outdoor systems. The benefits of installing approved indoor and outdoor split systems are maximum efficiency, optimum performance and the best overall reliability. The following charging methods are therefore prescribed for matched systems with indoor TXVs / EEVs. (Systems can be rated with TXV, EEV or Piston. Ensure charging method is correct).

1. Subcooling (in the cooling mode) is the only recommended method of charging above 55° ambient temperatures.
2.  For best results — the indoor temperature should be kept between 70° to 80° F. Add system heat if needed.
3. At startup, or whenever charge is removed or added, the system must be operated for a minimum of (20) minutes to stabilize before accurate measurements can be made.
4. Measure Liquid Line Temperature and RefrigerantPressure at service valves.
5. Determine total refrigerant line length, and height (lift) if indoor section is above the condenser.
6. Determine the Design Subcooling Charging Temperature from the unit nameplate.
7. Locate this value in the appropriate column of the Subcooling Charging Table. Locate your liquid line temperature in the left column of the table, and the intersecting liquid line pressure under your nameplate subcool value column. Add refrigerant to raise the pressure to match the table, or remove refrigerant to lower the pressure. Again, wait (20) minutes for the system conditions to stabilize before adjusting charge again.
8. When system is correctly charged, you can refer to System Pressure Curves to verify typical performance.

**Subcool Charging Correction Charts
![Subcool Charging Correction

Charts](https://manuals.plus/wp-content/uploads/2023/10/Screenshot_29-163.png)
**

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. (Include the entire length of the line from the service valve to the IDU.) Subtract 10 ft from this entire length and record on line 1.|

1. Total Line Length (ft) – 10 ft

|
STEP 2 – Enter the charge multiplier (0.6 oz/ft). Each linear foot of interconnecting tubing requires the addition of 0.6 oz of refrigerant.| 2. Charge multiplier| x 0.6 oz
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.| 3. Step 1 xStep 2| = –
STEP 4 – This is the amount of refrigerant to weigh-in prior to opening the service valves.| 4.Refrigerant (oz)| = – __ oz

Refrigerant Charging Chart

R-410A REFRIGERANT CHARGING CHART

**** LIQUID TEMP (°F)| DESIGN SUBCOOLING (°F)
8| 9| 10| 11| 12| 13| 14
LIQUID GAGE PRESSURE (PSI)
55| 179| 182| 185| 188| 191| 195| 198
60| 195| 198| 201| 204| 208| 211| 215
65| 211| 215| 218| 222| 225| 229| 232
70| 229| 232| 236| 240| 243| 247| 251
75| 247| 251| 255| 259| 263| 267| 271
80| 267| 271| 275| 279| 283| 287| 291
85| 287| 291| 296| 300| 304| 309| 313
90| 309| 313| 318| 322| 327| 331| 336
95| 331| 336| 341| 346| 351| 355| 360
100| 355| 360| 365| 370| 376| 381| 386
105| 381| 386| 391| 396| 402| 407| 413
110| 407| 413| 418| 424| 429| 435| 441
115| 435| 441| 446| 452| 458| 464| 470
120| 464| 470| 476| 482| 488| 495| 501
125| 495| 501| 507| 514| 520| 527| 533

Defrost Control

The demand defrost control measures heat pumpoutdoor ambient temperature with a sensor located outside the outdoor coil. A second sensor located on the outdoor coil is used to measure the coil temperature. The difference between the ambient and the colder coil temperature is the difference or delta-T measurement. This delta-T measurement is representative of the operating state and relative capacity of the heat pump system. Measuring the change in delta-T determines the need for defrost. The coil sensor also serves to sense outdoor coil temperature for termination of the defrost cycle.

Fault Detection

A fault condition is indicated by the flashing Fault LED light on the defrost control board located inside the heat pump control box.

In normal operation, the status LED will flash once eachsecond when idle or twice each second with a call for heating or cooling.

PIN Identification

1. TEST_COMMON (Shorting any of the other pins to this pin causes the function of the other pin to be executed. Leaving this pin open results in the normal mode of operation).
2. FRC_DFT = Forced Defrost (Short TEST_COMMON to this pin speeds up all defrost. Remove the short after defrost initiates.

Defrost Control Checkout

Normal operation requires:
a. Status LED on board flashing 1 time/second in standby or 2 times/second with a call for heating or cooling.
b. 24V AC between R & B
c. 24V AC between Y, Y0 & B with unit operating
d. Defrost initiation when FRC_DFT pin is shorted to
TEST_COMMON pin.

Test Sensors

Measure the temperature the subject sensor is exposed to. If the sensor is mounted on a tube, place the lead on an Annie A-8 (or equiv.) temperature tester on the same tube near the sensor and insulate the bulb.

Unplug the sensor and measure the resistance with a good quality ohmmeter (Simpson 260 or equiv.). Read the value as quickly as possible to prevent the meter current from changing the resistance reading.

Using the chart, locate (as close as possible) the actualsensor temperature. The measured resistance should be relatively close to the resistance value shown in the chart.

Table 1. Defrost Control Thermistor Table

**TEMP °F| ****TEMP °C| THERMISTOR RESISTANCE (OHMS)| ****Volts DC**
---|---|---|---
-15.00| -26.11| 135976| 2.50
-10.00| -23.33| 115112| 2.40
-5.00| -20.56| 97745| 2.29
0.00| -17.78| 83247| 2.17
5.00| -15.00| 71108| 2.05
10.00| -12.22| 60916| 1.93
15.00| -9.44| 52333| 1.81
20.00| -6.67| 45076| 1.69
25.00| -3.89| 38927| 1.56
30.00| -1.11| 33703| 1.45
35.00| 1.67| 29253| 1.33
40.00| 4.44| 25452| 1.22
45.00| 7.22| 22198| 1.12
50.00| 10.00| 19405| 1.02
55.00| 12.78| 17002| 0.93
60.00| 15.56| 14930| 0.85
65.00| 18.33| 13138| 0.77
70.00| 21.11| 11586| 0.70
75.00| 23.89| 10238| 0.63
80.00| 26.67| 9065| 0.57
85.00| 29.44| 8043| 0.52
90.00| 32.22| 7150| 0.47
95.00| 35.00| 6368| 0.42
100.00| 37.78| 5682| 0.38
105.00| 40.56| 5079| 0.35
110.00| 43.33| 4548| 0.31
115.00| 46.11| 4079| 0.28
120.00| 48.89| 3665| 0.26
125.00| 51.67| 3298| 0.23
130.00| 54.44| 2972| 0.21
135.00| 57.22| 2683| 0.19

Example:
Sensor temp. = 19°F
Measured Resistance = 46K ohms
This sensor is good since the measured value is
relatively close to the chart value.

Table 2. DEMAND DEFROST QUICK SPECS

(a) GROUP suffix for drawing number D
(b) ≤ (EQUAL OR LESS THAN)

Table 3. LED FAULT CODES

LED FAULT CODES| **FAULT DESCRIPTION| DEFROST CONTROL BEHAVIOR
---|---|---
** 1 FLASH| Ambient Temp Sensor is out of range (open/shorted)| Initiate defrost after every 60 minutes of runtime. Defrost will terminate on coil temp. See Note 1 & 2.
**** 2 FLASH| Coil Temp Sensor is out of range (open/shorted)| Initiate a 15 minute forced defrost after every 60 minutes of runtime. See Note 1 & 2.
3 FLASH| Low Pressure Switch is open| 3 flash goes away when/if LPCO closes.
4 FLASH| Hard Lock Out (can only be cleared with a low voltage power cycle)| Occurs after 9th trip of LPCO. See Note 6.

Table 3. LED FAULT CODES (continued)

LED FAULT CODES| **FAULT DESCRIPTION| DEFROST CONTROL BEHAVIOR
---|---|---
** 5 FLASH| Soft Lock Out| 5 flash goes away after soft lockout period expires. See Note 2.
**** 6 FLASH| **** Defrost cycles too close together| Heating short cycle fault triggers 6 flash. The system will follow 10 adaptive time heating cycles and then return to demand defrost.
**** 9 FLASH| Low Ambient Soft Lockout. Outdoor temperature dropped below 3°F. (OFF at-12°F/ON at 3°F)| Outdoor temperature is below -12°F. See Note 5.

1. Initiate Adaptive/Timed Limp Mode so long as Coil Temp Sensor is functional. Monitor actual time in defrost and add or reduce run time until next forced defrost based on achieving a 4 minute (+/-1) defrost period.

2. This defrost control utilizes a safety strategy called “Adaptive Limp Mode”. Adaptive limp mode is defined as a timed heating mode following rapid defrosts (accumulated heating times between defrost totaling less than 15 minutes). Once invoked the DFC will limit defrost periods and maximize heating capacity. While in adaptive limp mode the DFC will monitor heating and defrost periods for no longer than 10 cycles. The DFC will then release the board to demand defrost; however, if the LPCO trips while in limp mode the system will initiate a soft lockout and exit limp mode. If both Coil Temp Sensor and Ambient Temp Sensor have failed, initiate a 5 minute forced defrost every 60 minutes of run time. This in conjunction with the normal low pressure trip, will initiate a soft lockout.
   a. A short heating cycle that enters defrost in 15 minutes or less and/or enters two more defrosts with less than 15 minutes of accumulative run time each will enter an Adaptive Limp Mode (6 Flash).
   b. Coil sensor failure will initiate a Timed Limp Mode. This will be accompanied by a 2 flash. The DFC will initiate defrost after 60 minutes of accumulated heating runtime and terminate after a 5 minute defrost. The limp mode will clear after the sensor fault is cleared.
   c. Ambient sensor failure will initiate an Adaptive Timed Limp Mode. This will be accompanied by a 1 flash. The DFC will initiate defrost after 60minutes of accumulated heating runtime and force a defrost, which will terminate on coil temp. The limp mode will clear after the sensor fault is cleared.
   d. This could be caused by a condenser fan motor failure, low charge or other reasons.

3. The first 15 minute soft lockout the system will return to normal operation. Should this continue to operate in this manner there will be a 30 minute soft lockout and so on. At the end of the lockout process, if a hard lock is necessary, a 4 flash will be announced and system operation is interrupted. If the ambient temperature climbs above 40°F for more than 30 minutes this clears this fault count and resumes normal operation.
   a. If or when normal operation is restored after the ambient temperature climbs above 40°F for more than 30 minutes and another LP trip is monitored on the 9th trip this will initiate a hard lockout that will not be cleared by temperature or time.

4. Once ambient drops to -12 or lower wait 5 minutes before soft lockout begins. During soft lockout the Y signal passes through to the X2 output. Resume operation when ambient temperature rises to -3°F or higher and after 5 minute soft lockout period expires. LPCO should reset around 5°F.

5. During a Hard Lockout, the X2 relay opens so that  the Y signal does not pass through.
   LPCO| HEATING Mode| Flash Code
   ---|---|---
   1st Trip| 15 minute soft lock-out period| 5 and 6 flash
   2nd Trip| 30 minute soft lock-out period| 5 and 6 flash
   3rd Trip| 45 minutes soft lock-out period| 5 and 6 flash
   4th – 8th Trip| 18 hour soft lock-out period| 5 and 6 flash
   9th Trip (a)| Hard lock-out| 4 flash

(a) If LPCO is open, a 3 flash can accommodate any of the faults above and will clear when the LPCO closes.

Note: Once the LPCO closes, the 3 flash fault will not continue showing – only 5 flash if in the softlockout period.

Troubleshooting

Contactors

Troubleshooting

Refrigeration Circuit

Heating Refrigeration Cycle

Cooling Refrigeration Cycle

Pressure Curves

PRESSURE CURVES FOR A4HP5024D1

TAM9A0B30V31 Cooling @ 900 SCFM

TAM9A0B30V31 Heating @ 850 SCFM

OUTDOOR TEMPERATURE (Degree F)

OUTDOOR TEMPERATURE (Degree F)

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 ACTUAL:
4. LIQUID PRESSURE @ 600 CFM
5. SUCTION PRESSURE @ 600 CFM IS 145 PSIG

ACTUAL:

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

INTERCONNECTING LINES
GAS – 3/4 ” O.D.
LIQUID – 3/8 ” O.D.

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

AHRI

CERTIFIED

www.ahridirectory.org

Unitary Small HP AHRI Standard 210/240 Certification applies only when the complete system is listed with AHRI

The AHRI Certified mark indicates company participation in the AHRI Certification program. For verification of individual certified products, go to ahridirectory.org.
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.

A4HP5024D-SF-1A-EN 20 May 2022
Supersedes (New)

References

• OK - Við elskum tölvukerfi
• American Standard® | Air Conditioning and Heating | HVAC Systems
• Trane Heating & Air Conditioning

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