Medallion NT4QD, DT4(B,Q)D-K/KA Installation guide

Medallion NT4QD, DT4(B,Q)D-K/KA Installation guide

T4QD SerieS SpliT SySTem HeaT pump For manuFacTureD HouSing inSTallaTion inSTrucTionS

2, 2.5, 3, 3.5, 4, & 5 Ton, 13 Seer, Single phase models With Quick connect couplings

imporTanT SaFeTy inFormaTion ................. 2

HeaT pump inSTallaTion ................................ 3

General Information .............................................. 3

Before You Install this Unit ..................................... 3

Locating the Heat Pump........................................ 3

Packaging Removal .............................................. 3

Ground Level ......................................................... 3

Roof Mount............................................................ 3

Connecting Refrigerant Tubing Between the

Indoor & Outdoor Unit ........................................... 4

elecTrical Wiring ........................................... 4

Pre - Electrical Checklist ....................................... 4

Line Voltage ........................................................... 4

Thermostat Connections ....................................... 5

Blower Time Delay Relay ...................................... 6

Grounding ............................................................. 6

STarTup & aDjuSTmenTS ............................... 6

Pre - Start Checklist .............................................. 6

Start-up Procedures .............................................. 6

Air Circulation - Indoor Blower .............................. 6

System Cooling ..................................................... 6

System Heating ..................................................... 6

Refrigerant Charging ............................................. 6

Charging the Unit in AC Mode with

Outdoor Temperatures Above 55° F ...................... 7

HeaT pump mainTenance ............................... 7 componenT FuncTionS .................................. 8 cHarging TableS - cooling moDe ............. 8

Table 4. Charging Table for 2 Ton Units ............... 9

Table 5. Charging Table for 2.5 Ton Units ............ 9

Table 6. Charging Table for 3 Ton Units ............... 9

cHarging cHarTS - cooling moDe .......... 10

Figure 3. Charging Chart for 2 Ton Units ........... 10

Figure 4. Charging Chart for 2.5 Ton Units ........ 10

Figure 5. Charging Chart for 3 Ton Units ........... 11

Figure 6. Charging Chart for 3.5 Ton Units ........ 11

Figure 7. Charging Chart for 4 Ton Units ........... 12

Figure 8. Charging Chart for 5 Ton Units ........... 12

cHarging TableS - HeaTing moDe ............ 13

Table 7. Charging Table for 2 Ton Units ............. 14

Table 8. Charging Table for 2.5 Ton Units .......... 14

Table 9. Charging Table for 3 Ton Units ............. 14

Table 10. Charging Table for 3.5 Ton Units ........ 15

Table 11. Charging Table for 4 Ton Units ........... 15

Table 12. Charging Table for 5 Ton Units ........... 15

Wiring DiagramS ............................................ 16

Figure 9. T4QD Wiring Diagram ....................... 16

inSTall. / perFormance cHecKliST ......... 20 replacemenT parTS ...................................... 20

imporTanT aTTenTion inSTallerS:

it is your responsibility to know this product better than your customer. This includes being able to install the product according to strict safety guidelines and instructing the customer on how to operate and maintain the equipment for the life of the product. Safety should always be the deciding factor when installing this product and using common sense plays an important role as well. pay attention to all safety warnings and any other special notes highlighted in the manual. improper installation of the furnace or failure to follow safety warnings could result in serious injury, death, or property damage.

These instructions are primarily intended to assist qualified individuals experienced in the proper installation of this appliance. Some local codes require licensed installation/service personnel for this type of equipment. please read all instructions carefully before starting the installation. return these instructions to the customer’s package for future reference.

Do noT DeSTroy. pleaSe reaD careFully anD Keep in a SaFe place For FuTure reFerence.

2

imporTanT SaFeTy inFormaTion

INSTALLER: Please read all instructions before servicing this equipment. Pay attention to all safety warnings and any other special notes highlighted in the manual. Safety markings are used frequently throughout this manual to designate a degree or level of seriousness and should not be ignored. Warning indicates a potentially hazardous situation that if not avoided, could result in personal injury or death. cauTion indicates a potentially hazardous situation that if not avoided, may result in minor or moderate injury or property damage.

damage.

Warning:

elecTrical SHocK, Fire or eXploSion

HaZarD

Failure to follow safety warnings exactly could result in serious injury or property damage.

improper servicing could result in dangerous operation, serious injury, death or property

• Before servicing, disconnect all electrical power to the indoor blower.

• When servicing controls, label all wires prior to disconnecting. reconnect wires correctly.

• Verify proper operation after servicing.

Warning:

Warning: unless noted otherwise in these instructions, only factory authorized parts or accessory kits may be used with this product. improper installation, service, adjustment, or maintenance may cause explosion, fire, electrical shock or other hazardous conditions which may result in personal injury or property damage.

• Installation of equipment may require brazing operations. Installer must comply with safety codes and wear appropriate safety equipment (safety glasses, work gloves, fire extinguisher, etc.) when performing brazing operations.

• Follow all precautions in the literature, on tags, and on labels provided with the equipment. Read and thoroughly understand the instructions provided with the equipment prior to performing the installation and operational checkout of the equipment.

• Use caution when handling this appliance or removing components. Personal injury can occur from sharp metal edges present in all sheet metal constructed equipment.

Warning:

The information listed below and the next page must be followed during the installation, service, and operation of this furnace. Failure to follow safety recommendations could result in possible damage to the equipment, serious personal injury or death.

T4QD Split System Heat pumps are shipped fully charged with r410a refrigerant and ready for installation. When system is installed according to these instructions, no refrigerant charging is required. if repairs make it necessary for evacuation and charging, it should only be attempted by qualified trained personnel thoroughly familiar with this equipment. under no circumstances should the owner attempt to install and/or service this equipment. Failure to comply with this warning could result in property damage, personal injury, or death.

cauTion:

This unit uses refrigerant r-410a. Do noT use any other refrigerant in this unit. use of another refrigerant will damage the unit.

• The installer must comply with all local codes and regulations which govern the installation of this type of equipment. Local codes and regulations take precedence over any recommendations contained in these instructions. Consult local building codes and the National Electrical Code (ANSI CI) for special installation requirements.

• All electrical wiring must be completed in accordance with local, state and national codes and regulations and with the National Electric Code (ANSI/NFPA 70) or in Canada the Canadian Electric Code Part 1 CSA

C.22.1.

• This equipment contains liquid and gaseous refrigerant under high pressure. Do noT uSe any porTion oF

THe cHarge For purging or leaK TeSTing.

Installation or servicing should only be performed by qualified trained personnel thoroughly familiar with this type equipment.

• Fully annealed, refrigerant grade copper tubing should be used when installing the system. Refrigerant suction line tubing should be fully insulated.

• This unit is designed for outdoor installations only and should be positioned as described on page 3.

HeaT pump inSTallaTion

general information

The T4QD series heat pump is designed only for outdoor rooftop or ground level installations. This unit has been tested for capacity and efficiency in accordance with

AHRI Standards and will provide many years of safe and dependable comfort, providing it is properly installed and maintained. Abuse, improper use, and/or improper maintenance can shorten the life of the appliance and create unsafe hazards.

To achieve optimum performance and minimize equipment failure, it is recommended that periodic maintenance be performed on this unit. The ability to properly perform maintenance on this equipment requires certain mechanical skills and tools.

before you install this unit

The cooling load of the area to be conditioned must be calculated and a system of the proper capacity selected.

It is recommended that the area to be conditioned be completely insulated and vapor sealed.

Check the electrical supply and verify the power supply is adequate for unit operation. The system must be wired and provided with circuit protection in accordance with local building codes. If there is any question concerning the power supply, contact the local power company.

The indoor section (air handler, furnace, etc) should be installed before routing the refrigerant tubing. Refer to the indoor unit's installation instructions for installation details.

All units are securely packed at the time of shipment and upon arrival should be carefully inspected for damage prior to installing the equipment at the job site. Verify coil fins are straight. If necessary, comb fins to remove flattened or bent fins. Claims for damage (apparent or concealed) should be filed immediately with the carrier.

Please consult your dealer for maintenance information and availability of maintenance contracts. Please read all instructions before installing the unit.

packaging removal

noTe: To prevent damage to the tubing connections, carefully remove the carton and user’s manual from the equipment. Discard the shipping carton.

ground level

Ground level installations must be located according to local building codes or ordinances and these requirements:

• Clearances must be in accordance with those shown in Figure 1.

• A suitable mounting pad must be provided and separate from the building foundation. The pad must be level and strong enough to support the weight of the unit.

The slab height must be a minimum of 2” (5 cm) above grade and with adequate drainage. See Figure 1.

roof mount

The method of mounting should be designed so that it does not overload roof structures or transmit noise to the interior of the structure. The roof must be structurally capable of handling the weight of the unit.

Full perimeter support is required under the unit.

Support must be made of weather resistant materials and installed prior to unit installation.

• The support must be built to raise the unit 6" above the roof.

Building or Structure

24" for

Service Access

6"

12" See

Note

DO NOT

OBSTRUCT

TOP OF UNIT

12"

See Note

locating the Heat pump

Survey the job site to determine the best location for mounting the outdoor unit.

• The outdoor unit should be installed no closer than

18 inches from the outside walls of the facility and in an area free from overhead obstructions to ensure unrestricted airflow through the outdoor unit.

• Sufficient clearance for unobstructed airflow through the outdoor coil must be maintained in order to achieve rated performance. For minimum clearances to obstructions, see Figure 1.

• Overhead obstructions (Figure 1), poorly ventilated areas, and areas subject to accumulation of debris should be avoided.

Consideration should be given to availability of electric power, service access, noise, and shade.

NOTE:

Units require full perimeter clearances. Installer must maintain

18” between two units or 12” between single unit and structure.

48”

2”

Figure 1. clearance requirements

3

4 connecting refrigerant Tubing between the indoor

& outdoor unit

cauTion:

When servicing, cover or seal openings to minimize the exposure of the refrigerant system to air to prevent accumulation of moisture and other contaminants.

3. Make sure that coupling halves are held in proper alignment with each other prior to starting the threads of female coupling nut onto the male half. Thread coupling halves together by hand until a defi nite resistance is felt.

4. Using a marker, mark a line from the coupling union nut to the bulkhead then tighten an addition wrench fl at (60°). See Table 1 for torque values. Repeat for all couplings.

After outdoor and indoor unit placement has been determined, route refrigerant tubing between the equipment in accordance with sound installation practices.

• When connecting refrigerant linesets together, it is recommended that dry nitrogen be flowing through the joints during brazing to prevent internal oxidation and scaling.

• Refrigerant tubing should be routed in a manner that minimizes the length of tubing and the number of bends in the tubing. If precise forming of refrigerant lines is required, a copper tubing bender is recommended.

Avoid sharp bends and contact of the refrigerant lines with metal surfaces.

• Refrigerant tubing should be supported in a manner that the tubing will not vibrate or abrade during system operation.

• Tubing should be kept clean of foreign debris during installation.

• Every effort should be made by the installer to ensure that the field installed refrigerant containing components of the system have been installed in accordance with these instructions and sound installation practices to insure reliable system operation and longevity.

• The maximum recommended interconnecting refrigerant line lengths is 75 ft. and the vertical elevation difference between the indoor and outdoor sections should not exceed 20 ft.

• A filter dryer is provided with the unit and must be installed in the liquid line of the system. If the installation replaces a system with a filter dryer already present in the liquid line, the filter dryer must be replaced with the one supplied with the unit. The filter dryer must be installed in strict accordance with the manufacturer’s installation instructions.

• Optional equipment such as liquid line solenoid valves, low ambient, etc., should be installed in strict accordance with the manufacturer’s installation instructions.

These units are equipped with single shot quick connect couplings. Together with the indoor section and line set, only four coupling connections are required to provide a

100% sealed system.

1. Route the suction line and liquid line between indoor and outdoor sections, remove protector caps and plugs

2. lubricate entire surface of the diaphragm “O” ring and threads of the male coupling using the lubricant supplied with the line set and a small brush.

Coupling

Size

3/8” (10mm)

3/4” (19mm)

7.8” (22mm)

Torque

10-12 Ft-Lbs

(14-16 Nm)

35-45 Ft-Lbs

(47-61 Nm)

10-12 Ft-Lbs

(14-16 Nm)

Male

Coupling

Female

Coupling

Nut

Female

Coupling

Body

3/4”

1-1/8”

1-1/8”

Table 1. Torque Values

Warning:

11/16”

1-5/16”

1-5/16”

elecTrical Wiring

label all wires prior to disconnection when servicing the unit. Wiring errors can cause improper and dangerous operation.

5/8”

1”

1”

To avoid risk of electrical shock, personal injury, or death, disconnect all electrical power to the unit before performing any maintenance or service.

The unit may have more than one electrical supply.

• All electrical connections must be in compliance with all applicable local codes and ordinances, and with the current revision of the National Electric Code

(ANSI/NFPA 70).

• For Canadian installations the electrical connections and grounding shall comply with the current Canadian

Electrical Code (CSA C22.1 and/or local codes).

pre-electrical checklist

Verify that the voltage, frequency, and phase of the supply source match the specifications on the unit rating plate.

Verify that the service provided by the utility is sufficient to handle the additional load imposed by this equipment.

Refer to the unit wiring label for proper voltage wiring.

Verify factory wiring is in accordance with the unit wiring diagram (Figure 9, page 16). Inspect for loose connections.

Line Voltage

• A wiring diagram is located on the inside cover of the electrical box of the outdoor unit. The installer should become familiar with the wiring diagram before making any electrical connections to the outdoor unit.

200

3

3

4

4

2

6

4

2

2

1

an electrical disconnect must be located within

sight of and readily accessible to the unit. This switch shall be capable of electrically de-energizing the outdoor unit.

• Line voltage to the unit should be supplied from a dedicated branch circuit containing the correct fuse or circuit breaker for the unit. Incoming field wiring and minimum size of electrical conductors and circuit protection must be in compliance with information listed on the outdoor unit data label. Any other wiring methods must be acceptable to authority having jurisdiction.

• The outdoor unit requires both power and control circuit electrical connections. Refer to the wiring diagram / schematic for identification and location of outdoor unit field wiring interfaces (Figure 9, page 16). Make all electrical connections in accordance with all applicable codes and ordinances.

• Overcurrent protection must be provided at the branch circuit distribution panel and sized as shown on the unit rating label and according to applicable local codes.

See the unit rating plate for minimum circuit ampacity and maximum overcurrent protection limits.

• Provide power supply for the unit in accordance with the unit wiring diagram, and the unit rating plate. Connect the line-voltage leads to the terminals on the contactor inside the control compartment.

• Use only copper wire for the line voltage power supply to this unit as listed in Table 2. Use proper code agency listed conduit and a conduit connector for connecting the supply wires to the unit. Use of rain tight conduit is recommended.

• 208/230 Volt units are shipped from the factory wired for 230 volt operation. For 208V operation, remove the lead from the transformer terminal marked 240V and connect it to the terminal marked 208V.

• Optional equipment requiring connection to the power or control circuits must be wired in strict accordance of the NEC (ANSI/NFPA 70), applicable local codes, and the instructions provided with the equipment.

copper Wire SiZe — aWg

(1% Voltage Drop)

Thermostat connections

• Thermostat connections should be made in accordance with the instructions supplied with the thermostat and the indoor equipment. See Figure 2 (page 6).

• The outdoor unit is designed to operate from a 24 VAC

Class II control circuit. The control circuit wiring must comply with the current provisions of the NEC (ANSI/

NFPA 70) and with applicable local codes having jurisdiction.

• The low voltage wires must be properly connected to the units low voltage terminal block. Recommended wire gauge and wire lengths for typical thermostat connections are listed in Table 3 (page 6).

• The

thermostat should be mounted about 5 feet above the floor on an inside wall. DO NOT install the thermostat on an outside wall or any other location where its operation may be adversely affected by radiant heat from fireplaces, sunlight, or lighting fixtures, and convective heat from warm air registers or electrical appliances. Refer to the thermostat manufacturer’s instruction sheet for detailed mounting and installation information.

Blower Time Delay Relay (Select Models)

A time delay relay may be provided with the unit and must be installed in the indoor section. The relay will keep the indoor blower running an additional 40 seconds for increased cooling efficiency after the outdoor unit shuts off.

The relay has four terminals and one mounting hole.

Connect terminal 1 to load side of blower relay.

Connect terminal 2 to terminal r of T’stat.

Connect terminal 3 to common terminal at blower relay or transformer.

Connect terminal 4 to terminal g on T’stat.

grounding

Warning:

The unit cabinet must have an uninterrupted or unbroken electrical ground to minimize personal injury if an electrical fault should occur. Do not use gas piping as an electrical ground!

Supply Wire length-Feet

150

4

4

6

4

3

8

6

3

3

2

100

10

8

6

6

8

6

4

4

4

3

50

14

12

10

10

8

8

6

6

6

4

Supply circuit ampacity

15

20

25

30

35

40

45

50

55

60

This unit must be electrically grounded in accordance with local codes or, in the absence of local codes, with the National Electrical Code (ANSI/NFPA 70) or the CSA

C22.1 Electrical Code. Use the grounding lug provided in the control box for grounding the unit.

Wire Size based on N.E.C. for 60° type copper conductors.

Table 2. copper Wire Size

5

6

Thermostat

Wire gauge

24

22

20

18

recommended T-Stat Wire

Unit to T-Stat (Length in FT)

2-Wire

(Heating)

55

90

140

225

5-Wire

(Heating/Cooling)

25

45

70

110

Table 3. Thermostat Wire gauge

Green

G

Red

R

Brown

W

Orange W 2

For 2-Stage

Heater

Kits

Thermostat

G R W 2C E O Y

NOTE: Jumper between W2 and E is

T-Stat is used.

R

W 2

C O Y

Black

C

Air Handler

Green

Red

White W

G

R

Black

C

Thermostat

G R W 2C E O Y

Heat Pump OD

Section

E

R

W 2

C O Y

Air Handler Heat Pump OD

Section

Typical Heat Pump with

Outdoor Thermostat and Air Handler

Figure 2. Typical Thermostat connections

STarT up & aDjuSTmenTS

pre-Start check list

Verify the indoor unit is level and allows proper condensate drainage.

Verify the outdoor coil and top of the unit are free from obstructions and debris, and all equipment access/ control panels are in place.

Verify air filters are cleaned and properly installed.

Verify duct work is sealed to prevent air leakage.

Verify line voltage power leads are securely connected and the unit is properly grounded.

Verify low voltage wires are securely connected to the correct leads on the low voltage terminal strip.

Verify power supply branch circuit overcurrent protection is sized properly.

Verify the thermostat is wired correctly.

Start-up procedures

The thermostat's function mode should be set to OFF and the fan mode should be set to AUTO. Close all electrical disconnects to energize the system.

Air Circulation - Indoor Blower

1. Set the thermostat system mode on OFF and the fan mode to ON.

2. Verify the blower runs continuously. Check the air delivery at the supply registers and adjust register openings for balanced air distribution. If insufficient air is detected, examine ductwork for leaks or obstructions.

3. Set the thermostat fan mode to AUTO and verify the blower stops running.

System Cooling

1. Set the thermostat’s system mode to COOL and the fan mode to AUTO. Gradually lower the thermostat temperature setpoint below room temperature and verify the outdoor unit and indoor blower energize.

2. Verify blower wheel is spinning in direction indicated by arrow. Feel the air being circulated by the indoor blower and verify that it is cooler than ambient temperature.

Listen for any unusual noises. If unusual sounds occur, determine the source of the noise and correct as necessary.

3. Verify HI and LO refrigerant pressures.

4. Allow the system to operate for several minutes and then set the temperature selector above room temperature.

Verify the fan and compressor cycle off with the thermostat. noTe: The blower should also stop unless fan mode is set to the ON position.

System Heating (optional)

1. Set the thermostat's system mode to HEAT and the temperature mode above room temperature.

2. Verify the optional heating equipment (furnace or electric heat) and indoor blower energize. Feel the air being circulated by the indoor blower and verify that it is warmer than ambient temperature. Listen for any unusual noises. If unusual sounds occur, determine the source of the noise and correct as necessary.

refrigerant charging

Warning:

T4QD Split System Heat pumps are shipped fully charged with r410a refrigerant and ready for installation. When system is installed according to these instructions, no refrigerant charging is required. if repairs make it necessary for evacuation and charging, it should only be attempted by qualified trained personnel thoroughly familiar with this equipment. under no circumstances should the owner attempt to install and/or service this equipment. Failure to comply with this warning could result in property damage, personal injury, or death.

• After refrigerant line connections are completed, it is required that you leak check and evacuate the indoor section and all line connections (using proper methods) before finalizing the full system refrigerant charge.

• Refrigerant charging charts are applicable only to matched assemblies of NORDYNE equipment and listed airflows for the indoor coil. Refer to Tables 4 - 6

(page 9) and Figures 3 - 8 (pages 10 - 12) for correct system charging.

• T4QD outdoor units with non AHRI listed indoor coils are not recommended. Deviations from rated airflows or non-listed combinations may require modification to the expansion device and refrigerant charging procedures for proper and efficient system operation.

• The refrigerant charge can be checked and adjusted through the service ports provided external to the outdoor unit. Use only gage line sets which have a

“Schrader” depression device present to actuate the valve.

• Heat Mode Verification Tables (Tables 7 - 12, pages

14 - 15) are provided for quick reference when the unit is in heating mode and for the inspection of the liquid line pressures and temperatures.

Charging an R-410A system in AC mode at outdoor temperatures above 55° F for optimized sub-cooling of

10° F - 12° F.

1. With the system operating at steady-state, measure the liquid refrigerant pressure (in psig) at the outdoor unit service valve.

2. Measure the liquid refrigerant temperature (in

Fahrenheit) at the service valve.

3. Determine the required liquid refrigerant pressure from

Tables 4 - 6 (page 9) and Figures 3 - 8 (pages 10 - 12).

• If the pressure measured in Step 1 is greater than the required liquid refrigerant pressure determined in

Step 3, then there is too much charge in the system.

Remove refrigerant and repeat Steps 1 through 3 until the system is correctly charged.

• If the pressure measured in Step 1 is less than the required liquid refrigerant pressure determined in

Step 3, there is too little charge in the system. Add refrigerant and repeat Steps 1 through 3 until the system is correctly charged.

HeaT pump mainTenance

Warning:

To prevent electrical shock, personal injury, or death, disconnect all electrical power to the unit before performing any maintenance or service.

The unit may have more than one electrical supply.

Proper maintenance is important to achieve optimum performance from the heat pump. The ability to properly perform maintenance on this equipment requires certain mechanical skills and tools. If you do not possess these skills, contact your dealer for maintenance. Consult your local dealer about the availability of maintenance contracts.

Routine maintenance should include the following:

• Inspect and clean or replace air filters at the beginning of each heating and cooling season, or more frequently if required.

• Inspect the condensate drain and outdoor coil at the beginning of each cooling season. Remove any debris.

Clean the outdoor coil and louvers as necessary using a mild detergent and water. Rinse thoroughly with water.

• Inspect the electrical connections for tightness at the beginning of each heating and cooling season. Service as necessary.

cauTion:

The unit should never be operated without a filter in the return air system. replace disposable filters with the same type and size.

• Do not add additional oil to motors unequipped with oil tubes. The compressor is hermetically sealed at the factory and does not require lubrication.

7

8

componenT FuncTionS

High Pressure Switch (HPS) -

A high-pressure switch is factory-installed and located in the liquid line internal to the outdoor unit. The switch is designed to protect the system when very high pressures occur during abnormal conditions. Under normal conditions, the switch is closed.

If the liquid pressure rises above 575 psig, then the switch will open and de-energize the outdoor unit. The switch will close again once the liquid pressure decreases to 460 psig. Please note that the switch interrupts the thermostat inputs to the unit. Thus, when the switch opens and then closes, there may be a 5 minute short cycling delay before the outdoor unit will energize.

Low Pressure Switch (LPS) -

A low-pressure switch is factory-installed in select models only. If provided, this located in the suction line internal to the outdoor unit. The switch is designed to protect the compressor from a loss of charge. Under normal conditions, the switch is closed.

If the suction pressure falls below 5 psig, then the switch will open and de-energize the outdoor unit. The switch will close again once the suction pressure increases above 20 psig. Please note that the switch interrupts the thermostat inputs to the unit. When the switch opens and then closes, there will be a 5 minute short cycling delay before the outdoor unit will energize.

applicaTion noTeS For uSing T4QD reFrigeranT cHarging cHarTS & TableS - cooling only

legenD noTeS:

Shaded boxes indicate flooded conditions.

Rated design values. The suction pressure will be lower than design value if outdoor air flow, entering dry bulb, or entering wet bulb temperatures are lower than design.

1. All pressures are listed psig and all temperatures in °F

2. Discharge temperatures GREATER than charted values indicate an UNDERCHARGED system.

3. Discharge temperatures LESS than charted values indicate an OVERCHARGED system.

application notes on the use of charging charts

This equipment’s cooling system contains refrigerant under high pressure. always use safe and environmentally sound methods when handling refrigerant handling or servicing the unit. review the factory literature and safety warnings prior to servicing.

• When repairing system leaks, always use a nitrogen (inert) gas to protect the refrigerant system and pressure check the repair before re-charging. Always replace the filter-dryers when performing any repair to the refrigeration system with one capable of acid removal. After completing the repairs, evacuate the system to 350 - 500 microns and weigh in the refrigerant to the amount specified on the unit rating label.

The refrigerant charging charts and tables are valid for a variety of indoor, return air conditions and are most influenced by the outdoor ambient temperature, outdoor fan operation and the unit operating voltage. Before using these tables and charts, make sure the unit is in a stable operating mode. As shown in Tables 4 - 6 (page 9) and

Figures 3 - 8 (pages 10 - 12), the ideal system sub-cooling can vary over the range of operation. Reference the tables to determine the ideal amount of sub-cooling for a given liquid pressure. Units charged to other values will not perform at the rated unit efficiency (EER) or rated Coefficient of Performance (COP) in heating mode.

• To inspect a systems operation using quality instruments, match the measured liquid temperature to the units chart. The measured liquid pressure reading should be within 3% of the charts value for most installations.

• For systems that are operating with more than a 5% deviation, inspect the unit for the proper voltage and phase balance and the refrigeration system for leaks.

• Units that are operating at less then 95% of the nominal voltage or with a 2% phase imbalance may see a more significant deviation than the amount stated above.

Do noT use the charts in systems that have a fan cycling under low-ambient control. Refer to the low-ambient kit instructions for more information. (If applicable)

132

134

136

138

140

142

144

146

148

150

152

154

156

158

Suct. press.

liq.

press.

70

Dis.

Temp.

245

245

245

249

250

148

153

158

155

158

liq.

press.

75

Dis.

Temp.

268

269

269

272

273

147

152

156

156

159

liq.

press.

80

Dis.

Temp.

OUTDOOR TEMPERATURE (° F) liq.

press.

85

Dis.

Temp.

liq.

press.

90

Dis.

Temp.

liq.

press.

95

Dis.

Temp.

100 liq.

press.

Dis.

Temp.

105 liq.

press.

Dis.

Temp.

291

292

293

294

295

147

151

155

157

160

314

315

316

317

318

319

148

152

155

158

161

164

337

338

339

340

341

341

149

152

156

159

162

165

359

360

362

362

363

364

151

154

156

160

163

166

382

383

384

385

386

387

153

155

158

160

164

167

404

405

407

408

409

410

155

157

159

161

165

168

Table 4. Charging Table for T4QD-024KA Series (2 Ton Units) - Orifice Matches

130

132

134

136

138

140

142

144

146

148

150

152

154

156

Suct. press.

liq.

press.

70

Dis.

Temp.

248

249

249

250

251

145

150

155

159

163

liq.

press.

75

Dis.

Temp.

271

272

272

273

274

147

151

156

160

164

liq.

press.

80

Dis.

Temp.

OUTDOOR TEMPERATURE (° F) liq.

press.

85

Dis.

Temp.

liq.

press.

90

Dis.

Temp.

liq.

press.

95

Dis.

Temp.

100 liq.

press.

Dis.

Temp.

105 liq.

press.

Dis.

Temp.

293

294

295

296

296

149

153

157

161

165

316

317

317

318

319

320

151

155

159

163

167

171

338

339

340

341

341

342

153

157

160

164

168

172

360

361

362

363

364

365

155

159

162

166

170

174

383

384

385

385

386

387

158

161

164

168

171

175

405

406

407

408

409

409

161

164

166

170

173

177

Table 5. Charging Table for T4QD-030KA Series (2.5 Ton Units) - Orifice Matches

129

131

133

135

137

139

141

143

145

147

149

151

153

155

Suct. press.

liq.

press.

70

Dis.

Temp.

258

259

260

261

262

144

148

153

155

158

liq.

press.

75

Dis.

Temp.

282

283

284

285

286

147

151

155

158

161

liq.

press.

80

Dis.

Temp.

OUTDOOR TEMPERATURE (° F) liq.

press.

85

Dis.

Temp.

liq.

press.

90

Dis.

Temp.

liq.

press.

95

Dis.

Temp.

100 liq.

press.

Dis.

Temp.

105 liq.

press.

Dis.

Temp.

306

306

307

309

310

149

154

158

161

164

329

330

331

332

333

334

153

156

160

163

167

170

353

354

355

356

357

358

156

159

163

166

170

173

376

377

379

380

381

382

159

162

166

169

173

176

400

401

402

403

404

405

162

165

168

172

176

179

423

425

426

427

428

429

165

168

171

175

178

182

Table 6. Charging Table for T4QD-036KA Series (3 Ton Units) - Orifice Matches

9

400

375

350

325

300

275

250

75

550

525

500

475

450

425

Remove refrigerant when above curve

Add refrigerant when below curve

80 85 90 95 100 105

Liquid Temperature [F]

110 115 120

Figure 3. Charging Chart for T4QD-024K Series (2 Ton Units) - TXV Matches

125 130

10

550

525

500

475

450

425

400

375

350

325

300

275

250

75

Remove refrigerant when above curve

Add refrigerant when below curve

80 85 90 95 100 105

Liquid Temperature [F]

110 115 120 125

Figure 4. Charging Chart for T4QD-030K Series (2.5 Ton Units) - TXV Matches

130

425

400

375

350

325

300

275

250

75

550

525

500

475

450

Remove refrigerant when above curve

Add refrigerant when below curve

80 85 90 95 100 105

Liquid Temperature [F]

110 115 120

Figure 5. Charging Chart for T4QD-036K Series (3 Ton Units) - TXV Matches

125 130

550

525

500

475

450

425

400

375

350

325

300

275

250

75

Remove refrigerant when above curve

Add refrigerant when below curve

80 85 90 95 100 105

Liquid Temperature [F]

110 115 120

Figure 6. Charging Chart for T4QD-042K Series (3.5 Ton Units) - TXV Matches

125 130

11

550

525

500

475

450

425

400

375

350

325

300

275

250

75

Remove refrigerant when above curve

Add refrigerant when below curve

80 85 90 95 100 105

Liquid Temperature [F]

110 115 120

Figure 7. Charging Chart for T4QD-048K Series (4 Ton Units) - TXV Matches

125 130

425

400

375

350

325

300

275

250

75

550

525

500

475

450

Remove refrigerant when above curve

Add refrigerant when below curve

80 85 90 95 100 105

Liquid Temperature [F]

110 115 120

Figure 8. Charging Chart for T4QD-060K Series (5 Ton Units) - TXV Matches

125 130

12

applicaTion noTeS For uSing T4QD HeaT moDe

VERiFiCATiOn TABLES - HEATing OnLy

legenD

Shaded boxes indicate flooded conditions.

Rated design values. Suction pressure will vary from design value if outdoor air flow, entering dry bulb, or entering wet bulb temperatures vary .

noTeS:

1. All pressures are listed psig and all temperatures in °F

2. Discharge temperatures greater than charted values indicate an undercharged system .

read all notes and warnings for the cooling-mode charging charts and tables prior to using the heat mode verification tables. always use safe and environmentally sound methods when handling refrigerant handling or servicing the unit. review the factory literature and safety warnings prior to servicing.

When repairing system leaks, always use a nitrogen (inert) gas to protect the refrigerant system and pressure check the repair before re-charging. Always replace the filter-dryers when performing any repair to the refrigeration system with one capable of acid removal. After completing the repairs, evacuate the system to 350 - 500 microns and weigh in the refrigerant to the amount specified on the unit rating label.

Before using Tables 7 - 12 (pages 14-15), determine the outdoor ambient temperature and the return air temperature to the unit. Locate the appropriate location on the units verification chart based on those measurements to determine the ideal liquid line pressure and temperature. Verify the outdoor fan and compressor are running and the outdoor coil is free from frost accumulation. Also verify the system is not operating in defrost mode before inspecting the system.

Always use quality instruments that are in good working order to measure the actual operating point of the refrigeration system. The liquid line temperature should be within 2 degrees of the ideal value and the pressure should be within 2%.

The most reliable way of verifying the system is at the correct charge is to evacuate the system and weigh in the charge to the amount shown on the rating label. However, if an inspection with these verification tables does not line up with the values shown and the ambient temperature is above 50˚ F, then a more accurate way to inspect the system for proper charge is with charging charts and tables in the cooling mode section. Switch the unit into cooling mode and allow it to operate and stabilize for a few minutes then inspect the unit operation with the cooling mode charts and procedures.

before changing the unit charge, always inspect the following items first:

1. Inspect the liquid line temperature on the inlet and outlet of the filter dryers. If it is the factory dryer and in good condition there should be no temperature difference. If the temperature difference is larger than 5˚, replace the filter dryer with one that is bi-directional and has acid removal capability. Refer to the unit RPL for the recommended part number and size.

2. Inspect the units input voltage. Units operating at less than 95% of the nominal voltage may deviate more from the chart then previously stated.

3. Inspect the input voltage for a phase imbalance. Units with greater then a 2% disparity will not operate at the rated performance.

4. Verify that the unit filters are installed and are clean. The pressure drop across the filters should not exceed 0.08 in-W.C.

5. Inspect the indoor coil, indoor blower and blower motor for cleanliness, clogging, and proper operation. Verify the drive belt is in good condition and properly tightened.

6. Inspect the system for leaks. If any leaks are detected, repair them immediately. Re-inspect the return air and ambient temperatures and verify that the correct system point on the verification chart was selected.

Do noT use the tables in systems that have the fan cycling under a low-ambient control. Low-ambient controls are for cooling operation. In heating mode, the low ambient control should be disabled. Unless the unit is in defrost mode, the outdoor fan should always operate in conjunction with the compressor.

13

14

15

Wiring DiagramS

Yellow

CC

16

Figure 9. T4QD Wiring Diagram

17

18

19

inSTallaTion aDDreSS:

inSTallaTion / perFormance cHecK liST

elecTrical SySTem:

Electrical connections tight?

YES

Line voltage polarity correct?

YES

CITY ________________________ STATE ________________

UNIT MODEL # ________________________________________

NO

NO

Rated Voltage: ___________________________________ VOLTS

UNIT SERIAL # _______________________________________

Unit Installed Minimum clearances per

Figure 1 (page 3)?

YES NO

inSTaller name:

L1-L2 Volts: _____________________________________ VOLTS

L1-L3 Volts: _____________________________________ VOLTS

L2-L3 Volts: _____________________________________ VOLTS

CITY _______________________ STATE ________________

Avg. Volts: ______________________________________ VOLTS

Max. deviation of voltage from avg. volts: ___________________________________ VOLTS

reFrigeraTion SySTem:

Was unit given 24 hr warm up period for crankcase heaters?

YES NO

Stage-1 Liquid Pressure (high side) ________________________

Stage-1 Suction Pressure (low side) ________________________

Has the owner’s information been reviewed with the customer?

YES NO

Has the Literature Package been left with the unit?

YES NO

% Volt imbalance: ________________________________ VOLTS

Blower Motor HP: ________ Sheave Setting ___________# Turns

Has the thermostat been calibrated?

YES NO

YES NO Is the thermostat level?

Is the heat anticipator setting correct?

(If Applicable)

YES NO

replacemenT parTS

Replacement parts are available through all Nordyne distributors.

Please have the complete model and serial number of the unit when ordering replacement parts.

electrical

Capacitors

Compressors

Contactors

Pressure Switches

Relays

motors

Blower Motor

components

Blower Assembly

Cabinet Panels

Expansion Valves

Temperature Limit Switches

Thermostats

Time Delay Relays

Transformers

Fan Motor

Fan Grille

Filter/Driers

Specifications & illustrations subject to change without notice or incurring obligations.

O’ Fallon, MO | Printed in U.S.A. (11/11) 7092940 (Replaces 7089980)

Was this manual useful for you? yes no
Thank you for your participation!

* Your assessment is very important for improving the work of artificial intelligence, which forms the content of this project

Download PDF

advertisement

Table of contents