Trane 4TTR7 Series Installer'S Manual Download Page 14

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18-AC94D1-4C-EN

With Variable Speed UH2/DH2-V Furnace

• Units with pigtails require wirenuts for connec-

tions. Cap all unused wires.

• In systems with multiple stages of heat, jumper

W1 and W2 together if comfort control has only one

stage of heat.

** When using a BK enabled comfort control, cut BK

(W14) jumper and bypass Y and BK at the furnace.

Connect BK from comfort control to BK of the

furnace.

• Install R-O Jumper and cut BK Jumper (W14)

Furnace

Thermostat

Outdoor

Unit

B/C

24 VAC HOT

FAN

24 VAC

Common

HEATING

COOL

1st STAGE

COOL

2nd STAGE

With Variable Speed S-Series Furnace

NOTES:

1) For PWM (BK) enabled thermostats, cut the BK jumper on

the IFC and connect wiring.

2) The factory Y1-O jumper must remain in place for proper

LED read out in cooling mode.

3) Y1 and Y2 wiring from the thermostat must connect to

the IFC for proper airflow and LED readout.

4) Single compressor and two compressor airflow is auto-

matically set with the IFC Menu options in ODU section.

2-1=2 stage / 1 compressor (1st stage airflow = 75%)

2-2=2 stage / 2 compressors (1st stage airflow = 50%)

Furnace

Thermostat

Outdoor

Unit

B/C

24 VAC HOT

FAN

SOV

24 VAC

Common

HEATING

(1)

(2)

COOL

1st STAGE

COOL

2nd STAGE

Summary of Contents for 4TTR7 Series

Page 1: ...es 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 4TTR7024A 4TTR7036A 4TTR7048A 4TTR7060A Note Graphics in this document are for representation only Actual...

Page 2: ...ouble shooting of this product it may be necessary to work with live electrical components Failure to follow all electrical safety precautions when exposed to live electrical components could result in death or serious injury s s WARNING If using existing refrigerant lines make certain that all joints are brazed not soldered CAUTION Scroll compressor dome temperatures may be hot Do not touch the t...

Page 3: ...rigerant 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 Refriger ant Piping Application Guide SS APG006 EN or Refrigerant Piping Softw...

Page 4: ...n areas where snow accumulation 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 loca...

Page 5: ...t 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 If installed within one mile of salt wa...

Page 6: ... Liquid Line Vapor Line Connection Liquid Line Connection TOTAL Max Line Length ft Max Lift ft 4TTR7024A 3 4 3 8 3 4 3 8 150 50 4TTR7036A 3 4 3 8 3 4 3 8 150 50 4TTR7048A 7 8 3 8 7 8 3 8 150 50 4TTR7060A 1 1 8 3 8 7 8 3 8 150 50 ALTERNATE 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 Len...

Page 7: ...ater in STEP 2 of Section 14 Total Line Length __________ Ft Total Vertical Change lift __________ Ft 5 5 Reuse Existing Refrigerant Lines 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 lin...

Page 8: ...ld be insulated and isolated Isolate the lines from all ductwork Minimize the number of 90º turns Comply with National State and Local Codes when isolating line sets from joists rafters walls or other structural elements Isolation From Joist Rafter Side View 8 Feet Maximum Secure Vapor line from joists using isolators every 8 ft Secure Liquid Line directly to Vapor line using tape wire or other ap...

Page 9: ...ctwork Isolator Line Set Section 7 Refrigerant Line Brazing 7 1 Braze The Refrigerant Lines STEP 1 Remove caps or plugs Use a debur ing 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 ...

Page 10: ... rator coil as illustrated Braze the filter drier to the Liquid Line 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 NOTE Precautions should be taken to avoid Precautions should be taken to avoid heat damage to basepan during brazing It is heat damage ...

Page 11: ...TEP 1 Pressurize the refrigerant lines and evaporator coil to 150 PSIG using dry nitrogen 150 PSIG Section 9 Evacuation 9 1 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 v...

Page 12: ...ap STEP 2 Fully insert 3 16 hex wrench into the stem and back out counterclockwise until 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 Cap Rolled Edge to Captivate Stem Hex Headed Valve System Service Port 3 16 Hex Wrench Unit Side of Service Valve Extreme caution should be exercised...

Page 13: ...ort control cut BK jumper and bypass Y1 and Y2 at the air handler Connect BK from comfort control to BK of the air handler Install R O jumper 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 TAM7 DIP switches must be configured for AC 2 Stage 1 Compressor Thermostat Air Handler Outdoor Unit R G B W1 W2 B Y1 R G ...

Page 14: ...n HEATING O BK BK Y2 Y2 COOL 1st STAGE COOL 2nd STAGE With Variable Speed S Series Furnace NOTES 1 For PWM BK enabled thermostats cut the BK jumper on the IFC and connect wiring 2 The factory Y1 O jumper must remain in place for proper LED read out in cooling mode 3 Y1 and Y2 wiring from the thermostat must connect to the IFC for proper airflow and LED readout 4 Single compressor and two compresso...

Page 15: ...on testing servicing and troubleshooting of this product it may be nec essary to work with live electrical components Failure to follow all electrical safety precau tions when exposed to live electrical compo nents could result in death or serious injury s s WARNING 12 2 High Voltage Disconnect Switch Install a separate disconnect switch at the outdoor unit For high voltage connections flexible el...

Page 16: ...t s to apply power to the indoor and outdoor units STEP 5 Set system thermostat to ON OFF DONE CANCEL ON OFF STEP 4 Wait one 1 hour before starting the unit if compressor crankcase heater acces sory is used and the Outdoor Ambient is below 70ºF 60 MIN STEP 1 Ensure Sections 7 through 12 have been completed ON DONE CANCEL ...

Page 17: ... tempera ture is above 55º F For best results the indoor temperature should be kept between 70º F to 80º F STEP 1 Use the refrigerant line total length and lift measurements from Section 5 3 Total Line Length __________ Ft Vertical Change Lift __________ Ft Section 14 System Charge Adjustment 14 1 Temperature Measurements 14 2 Subcooling Charging in Cooling Above 55º F Outdoor Temp LIFT Indoor Tem...

Page 18: ...OL CHARGING CHART CORRECTIONS TABLE FOR LINE LENGTH AND RISE Add 2 REFRIGERANT LINE LIFT FT 4 Ton AC 50 1 40 1 30 25 Use Design Subcooling 15 10 0 20 30 40 50 60 70 80 90 100 110 120 130 140 150 REFRIGERANT LINE LIFT FT SUBCOOL CHARGING CHART CORRECTIONS TABLE FOR LINE LENGTH AND RISE Add 4 TOTAL REFRIGERANT LINE LENGTH FT includes lift Add 2 Add 1 Add 1 5 Ton AC 50 1 40 1 30 25 Use Design Subcool...

Page 19: ...ge Pressure should be ap proximately 327 PSIG This is the shown as the intersection of the Final Subcooling column and the Liquid Temperature row Table 14 2 8 9 10 11 12 13 14 179 182 185 188 191 195 198 195 198 201 204 208 211 215 211 215 218 222 225 229 232 229 232 236 240 243 247 251 247 251 255 259 263 267 271 267 271 275 279 283 287 291 287 291 296 300 304 309 313 309 313 318 322 327 331 336 ...

Page 20: ...OR TEMPERATURE Degree F SUCTION PRESSURE PSIG 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 DISCHARGE AND SUCTION PRESSURES ON THE PLOTS LOCATE OUTDOOR TEMPERATURE 1 LOCATE INDOOR WET BULB 2 FIND INT...

Page 21: ...Measured Suction Line Temp __________ º F Liquid Gage Pressure __________ PSIG Suction Gage Pressure __________ PSIG Calculating Charge Using the Weigh In Method 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 2 Enter the charge multiplier ...

Page 22: ...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 Section 15 Checkout Procedures and Troubleshooting 15 1 Operational And Checkout Procedures CHECKOUT PROCEDURE After installation has been completed it is recommended that the entire system be checked against the following list Final pha...

Page 23: ... A C T O R C O I L L O W V O L T A G E F U S E S T U C K C O M P R E S S O R I N E F F I C I E N T C O M P R E F U N D E R C H A R G E R E F O V E R C H A R G E E X C E S S I V E E V A P L O A D N O N C O N D E N S A B L E S R E S O D A I R F L O W O D A I R R E C I R C U L A T I O N T X V E E V S T U C K O P E N S U P E R H E A T R E S I D A I R F L O W R E F C I R R E S T R I C T I O N S S O V L...

Page 24: ...e AHRI Certified mark indicates Trane U S Inc participation in the AHRI Certification program For verification of individual certified products go to ahridirectory org Trane 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 2020 Trane 18 AC94D1 4C EN 16 Oct 202...

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