Lennox T-Class TSA H4 Series Installation Instructions Manual Download Page 19

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Page 19

TSA*H4 SERIES

TO LIQUID

LINE SERVICE

VALVE

TEMPERATURE

SENSOR

DIGITAL SCALE

REFRIGERANT TANK

TEMPERATURE SENSOR

(LIQUID LINE)

MANIFOLD GAUGE SET

Close manifold gauge set valves and
connect the center hose to a cylinder of
HFC-410A. Set for liquid phase
charging.

Connect the manifold gauge set's low
pressure side to the suction line service
port.

Connect the manifold gauge set's high
pressure side to the liquid line service
port.

Position temperature sensor on liquid
line near liquid line service port.

OUTDOOR UNIT

CHARGE IN

LIQUID PHASE

CONNECTIONS FOR TESTING AND CHARGING

GAUGE SET

LOW

HIGH

SUCTION LINE
SERVICE PORT
CONNECTION

Figure 16. Manifold Gauge Set Setup and Connections

WHEN TO CHARGE?

Warm weather best

Can charge in colder weather

CHARGE METHOD? Determine by:

Metering device type

Outdoor ambient temperature

REQUIREMENTS:

Sufficient heat load in structure

Indoor temperature between 70‐80ºF (21-26ºC)

Manifold gauge set connected to unit

Thermometers:
-

to measure outdoor ambient temperature

to measure liquid line temperature

to measure suction line temperature

APPROACH OR

SUBCOOLING

WEIGH‐IN

64ºF (17.7ºC)

AND BELOW

65ºF (18.3ºC)

AND ABOVE

START: Determine how refrigerant is metered

TXV

Figure 17. Determining Charge Method

OUTDOOR AMBIENT

TEMPERATURE

Summary of Contents for T-Class TSA H4 Series

Page 1: ...service valve s internal seals INSTALLATION INSTRUCTIONS T Classt TSA H4 Units AIR CONDITIONER 507994 01 7 19 TABLE OF CONTENTS Shipping and Packing List 1 General 1 Unit Dimensions 2 Typical Unit Parts Arrangement 2 Model Number Identification 3 Operating Manifold Gauge Set and Service Valves 3 Recovering Refrigerant from Existing System 5 New Unit Placement 6 New or Replacement Line Set 7 Brazin...

Page 2: ...SA060H4N4 32 1 4 819 33 1 4 845 Typical Unit Parts Arrangement COMPRESSOR HARNESS CONNECTION LIQUID LINE SERVICE VALVE SUCTION LINE SERVICE VALVE DISCHARGE LINE HIGH PRESSURE SWITCH S4 COMPRESS0R B1 GROUND LUG CONTACTOR K1 CONTROL CAPACITOR C12 MOUNTING LOCATION VARIES CONTROL WIRE LOOP CUTOUT FOR HIGH VOLTAGE CONDUIT NOTE Plumbing layout and compressor type may vary between model sizes CRANKCASE ...

Page 3: ...ell Harness Scale minimum Fully insert the wrench into the valve stem recess Service valve stems are factory torqued from 9 ft lbs for small valves to 25 ft lbs for large valves to prevent refrigerant loss during shipping and handling Using an Allen wrench rated at less than 50Rc risks rounding or breaking off the wrench or stripping the valve stem recess See the Lennox Service and Application Not...

Page 4: ...opriately sized wrench 2 Use an appropriately sized wrenched to open To open valve rotate stem counterclockwise 90 To close rotate stem clockwise 90 1 2 3 4 5 6 7 8 9 10 11 12 1 12 TURN To Access Service Port A service port cap protects the service port core from contamination and serves as the primary leak seal 1 Remove service port cap with an appropriately sized wrench 2 Connect gauge set to se...

Page 5: ...ction that is designed to unload the scrolls compressor stops pumping when the pressure ratio meets a certain value or when the suction pressure is as high as 20 psig Compressor suction pressures should never be allowed to go into a vacuum Prolonged operation at low suction pressures will result in overheating of the scrolls and permanent damage to the scroll tips drive bearings and internal seals...

Page 6: ... away from windows Two 90 elbows installed in line set will reduce line set vibration Figure 5 Placement and Slab Mounting New Unit Placement See Unit Dimensions on page 2 for sizing mounting slab platforms or supports Refer to figure 4 for mandatory installation clearance requirements CAUTION In order to avoid injury take proper precaution when lifting heavy objects POSITIONING CONSIDERATIONS Con...

Page 7: ...lbows and if there is a rise or drop of the piping If refrigerant lines are routed through a wall seal and isolate the opening so vibration is not transmitted to the building Pay close attention to line set isolation during installation of any HVAC system When properly isolated from building structures walls ceilings floors the refrigerant lines will not create unnecessary vibration and subsequent...

Page 8: ... material or anchored heavy nylon wire ties 8 FEET 2 43 METERS STRAP THE VAPOR LINE TO THE JOIST OR RAFTER AT 8 FEET 2 43 METERS INTERVALS THEN STRAP THE LIQUID LINE TO THE VAPOR LINE FLOOR JOIST OR ROOF RAFTER REFRIGERANT LINE SET INSTALLING HORIZONTAL RUNS NOTE Similar installation practices should be used if line set is to be installed on exterior of outside wall PVC PIPE FIBERGLASS INSULATION ...

Page 9: ...ystem may result in ignition of the refrigerant and oil mixture Check the high and low pressures before applying heat WARNING When using a high pressure gas such as dry nitrogen to pressurize a refrigeration or air conditioning system use a regulator that can control the pressure down to 1 or 2 psig 6 9 to 13 8 kPa CAUTION Brazing alloys and flux contain materials which are hazardous to your healt...

Page 10: ...E AWAY FROM SERVICE VALVE Flow regulated nitrogen at 1 to 2 psig through the low side refrigeration gauge set into the liquid line service port valve and out of the suction vapor line service port valve CUT AND DEBUR CAP AND CORE REMOVAL Cut ends of the refrigerant lines square free from nicks or dents and debur the ends The pipe must remain round Do not crimp end of the line Remove service cap an...

Page 11: ...ICE VALVES POINT FLAME AWAY FROM SERVICE VALVE PREPARATION FOR NEXT STEP 7 WARNING 1 FIRE PERSONAL INJURY OR PROPERTY DAMAGE will result if you do not wrap a wet cloth around both liquid and suction line service valve bodies and copper tube stub while brazing in the line set The braze when complete must be quenched with water to absorb any residual heat 2 Do not open service valves until refrigera...

Page 12: ... on the recovery machine with an empty recovery tank to the gauge set D Connect recovery tank to recovery machines per machine instructions CONNECT GAUGES AND EQUIPMENT FOR FLUSHING PROCEDURE A B C D B OR A Set the recovery machine for liquid recovery and start the recovery machine Open the gauge set valves to allow the recovery machine to pull a vacuum on the existing system line set and indoor u...

Page 13: ...DISTRIBUTOR ASSEMBLY A Remove the field provided fitting that temporary reconnected the liquid line to the indoor unit s distributor assembly B Install one of the provided Teflon rings around the stubbed end of the expansion valve and lightly lubricate the connector threads and expose surface of the Teflon ring with refrigerant oil C Attach the stubbed end of the expansion valve to the liquid line...

Page 14: ...R UNIT HIGH LOW NITROGEN A With both manifold valves closed connect the cylinder of HFC 410A refrigerant to the center port of the manifold gauge set Open the valve on the HFC 410A cylinder vapor only B Open the high pressure side of the manifold to allow HFC 410A into the line set and indoor unit Weigh in a trace amount of HFC 410A A trace amount is a maximum of two ounces 57 g refrigerant or thr...

Page 15: ... and indoor unit until the absolute pressure does not rise above 500 microns 29 9 inches of mercury within a 20 minute period after shutting off the vacuum pump and closing the manifold gauge valves F When the absolute pressure requirement above has been met disconnect the manifold hose from the vacuum pump and connect it to an upright cylinder of HFC 410A refrigerant Open the manifold gauge valve...

Page 16: ...st conform with current local codes and the current Canadian Electrical Code CEC Refer to the furnace or air handler installation instructions for additional wiring application diagrams and refer to unit nameplate for minimum circuit ampacity and maximum overcurrent protection size 24VAC TRANSFORMER Use the transformer provided with the furnace or air handler for low voltage control power 24VAC 40...

Page 17: ... voltage control wire strain relief and to maintain separation of field installed low and high voltage circuits NOTE For proper voltages select thermostat wire control wires gauge per table above NOTE Do not bundle any excess 24VAC control wires inside control panel A Run 24VAC control wires through hole with grommet and secure with provided wire tie B Make 24VAC thermostat wire connections Locate...

Page 18: ...tion line service valve stems Operating Service Valves on page 3 to release the refrigerant charge contained in outdoor unit into the system 4 Replace the valve stem caps and tighten as specified in Operating Service Valves on page 3 5 Check voltage supply at the disconnect switch The voltage must be within the range listed on the unit s nameplate If not do not start the equipment until you have c...

Page 19: ... LIQUID PHASE CONNECTIONS FOR TESTING AND CHARGING GAUGE SET A C D LOW HIGH B SUCTION LINE SERVICE PORT CONNECTION Figure 16 Manifold Gauge Set Setup and Connections WHEN TO CHARGE Warm weather best Can charge in colder weather CHARGE METHOD Determine by Metering device type Outdoor ambient temperature REQUIREMENTS Sufficient heat load in structure Indoor temperature between 70 80ºF 21 26ºC Manifo...

Page 20: ...T Chart START Measure outdoor ambient temperature 64ºF 17 7ºC and BELOW 1 Check Liquid and suction line pressures 2 Compare unit pressures with table 3 or 6 3 Conduct leak check evacuate as previously outlined 4 Weigh in the unit nameplate charge plus any charge required for line set differences over feet Liquid Line Set Diameter g per 1 5 m adjust from 4 6 m line set 9 5 mm 85 g per 1 5 m NOTE If...

Page 21: ...e to determinesaturation temperature see table 4 SATº ______ 10 Subtract to determine subcooling SCº SATº_____ LIQº _____ SCº _____ 11 Compare results with table below Figure 21 HFC 410A Subcooling TXV Charge MORE or LESS If value is LESS than shown add refrigerant If refrigerant is added or removed verify charge using the Approach Method 64ºF and BELOW 65ºF and ABOVE ABOVE or BELOW ºF ºC 036 048 ...

Page 22: ... thermostat switch S40 located on the liquid line see figure 1 for location When liquid line temperature drops below 50 F the thermostat closes energizing HR1 The thermostat will open de energizing HR1 once liquid line temperature reaches 70 F HIGH PRESSURE SWITCH S4 TSA H4 units are equipped with a high pressure switch that is located in the liquid line of the compressor The switch SPST manual re...

Page 23: ...they could cause prolonged exposure to the outdoor unit by treated water Prolonged exposure of the unit to treated water i e sprinkler systems soakers waste water etc will corrode the surface of steel and aluminum parts and diminish performance and longevity of the unit Outdoor Coil The outdoor unit must be properly maintained to ensure its proper operation Please contact your dealer to schedule p...

Page 24: ...s usually unnecessary to fully remove the inner mesh screen 4 Drape the mesh screen back and wash the coil When all the debris has been removed from the coil reinstall the mesh screen by positioning it in its original position and reinserting the push pin No tool is required to push the pin back into the same slot in the fins 5 If the push pin is loose and tends not to stay in place brush the fins...

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