Lennox TPA036H4N4 Installation Instructions Manual Download Page 39

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Page 39

TPA*H4 SERIES

Checklists

Two−Stage Modulation Compressors Field Operational Checklist

Unit Readings

Y1 − First-Stage

Expected results during Y2

demand (Toggle switch On)

Y2 − Second-Stage

COMPRESSOR

Voltage

Same

Amperage

Higher

OUTDOOR UNIT FAN
MOTOR

Amperage

Same or Higher

TEMPERATURE

Ambient

Same

Outdoor Coil Discharge Air

Higher

Compressor Discharge Line

Higher

Indoor Return Air

Same

Indoor Coil Discharge Air

Lower

PRESSURES

Suction (Vapor)

Lower

Liquid

Higher

Summary of Contents for TPA036H4N4

Page 1: ...operation to set the defrost termination pins P1 on the defrost control prior to starting system See Defrost System section on page 31 for further details DEFROST OPERATION INSTALLATION INSTRUCTIONS...

Page 2: ...IR INLET AIR INLET AIR SIDE VIEW Model Numbers A B TPA036H4N4 32 1 4 819 29 1 4 743 TPA042H4N4 32 1 4 819 37 940 TPA048H4N4 32 1 4 819 37 940 TPA060H4N4 32 1 4 819 43 1 4 1099 Model Number Identificat...

Page 3: ...PRESSURE SWITCH S87 NOTE PLUMBING LAYOUT AND COMPRESSOR TYPE MAY VARY SLIGHTLY BETWEEN MODEL SIZES GROUND LUG CONTACTOR K1 CONTROL BOX CONTROL WIRE LOOP CUTOUT FOR HIGH VOLTAGE CONDUIT DEFROST CONTRO...

Page 4: ...tion IMPORTANT To prevent stripping of the various caps used the appropriately sized wrench should be used and fitted snugly over the cap before tightening When servicing or repairing HVAC components...

Page 5: ...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 wrenc...

Page 6: ...tops 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 operati...

Page 7: ...INLET AIR INLET AIR INLET AIR INLET AIR PREVAILING WINTER WINDS These units operate under a wide range of weather conditions therefore several factors must be considered when positioning the outdoor...

Page 8: ...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...

Page 9: ...TERS 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...

Page 10: ...em 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 refrigera...

Page 11: ...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...

Page 12: ...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...

Page 13: ...ist or damage distributor tubes during this process G Remove and discard check expansion valve and the two Teflon rings H Use a field provided fitting to temporary reconnect the liquid line to the ind...

Page 14: ...he 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...

Page 15: ...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...

Page 16: ...d 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 Wh...

Page 17: ...onform 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...

Page 18: ...NLY WARNING ELECTRIC SHOCK HAZARD Can cause INJURY or DEATH Unit must be grounded in accordance with national and local codes NOTE For use with copper conductors only Refer to unit rating plate for mi...

Page 19: ...INDOOR BLOWER COMPRESSOR SOME CONNECTIONS MAY NOT APPLY REFER TO SPECIFIC THERMOSTAT AND INDOOR UNIT POWER COMMON FIRST STAGE AUXILIARY HEAT Figure 15 TPA H4 and Blower Unit Thermostat Designations R...

Page 20: ...Page 20 506650 01 Figure 17 Typical Factory Wiring Diagram Y Voltage 208 230V 3 PH...

Page 21: ...Page 21 TPA H4 SERIES Figure 18 Typical Factory Wiring Diagram G Voltage 460V 3 PH...

Page 22: ...line side of the compressor contactor Make sure connections are tight Repeat pressure test with system Servicing Units Delivered Void of Charge If the outdoor unit is void of refrigerant clean the sy...

Page 23: ...tering and leaving air temperatures A and C Temperature Drop Formula TDrop A minus C 3 Determine if fan needs adjustment If the difference between the measured TDrop and the desired DT TDrop DT is wit...

Page 24: ...or ambient temperature determine whether to use cooling mode or heating mode to check charge 3 Connect gauge set 4 Check Liquid and Vapor line pressures Compare pressures with Normal Operating Pressur...

Page 25: ...N 6007 13 6 0 0 CBX40UHV 060 11 8 1 2 Add charge Extra matchup amount required in addition to charge indicated on Heat Pump nameplate remember to also add any charge required for line set differences...

Page 26: ...ch trips the demand defrost control will cycle off the compressor and the strike counter in the demand defrost control will count one strike High Pressure auto reset trip at 590 psig reset at 418 Low...

Page 27: ...ng HR1 The thermostat will open de energizing HR1 once liquid line temperature reaches 70 F Internal Solenoid L34 The internal unloader solenoid controls the two stage operation of the compressor by s...

Page 28: ...efrost system starts and after each system defrost cycle The demand defrost control components are shown in figure 22 24V TERMINAL STRIP CONNECTIONS DIAGNOSTIC LEDS PRESSURE SWITCH CIRCUIT CONNECTIONS...

Page 29: ...he unit is cycling in and out of the defrost mode When a jumper is installed on the DELAY pins the compressor will be cycled off for 30 seconds going in and out of the defrost mode Units are shipped w...

Page 30: ...dition Code Possible Cause s Solution Each fault adds 1 strike to that code s counter 5 strikes per code LOCKOUT OFF SLOW Flash Low Pressure Fault 1 Restricted air flow over indoor or outdoor coil 2 I...

Page 31: ...ssure switches LO PS S87 and HI PS S4 are factory wired into the demand defrost control on the LO PS and HI PS terminals respectively Pressure Switch 5 Strike Lockout The internal control logic of the...

Page 32: ...the shunt jumper must be removed for at least one second and reapplied Refer to flow chart figure 24 for TEST operation Note The Y1 input must be active ON and the O room thermostat terminal into dem...

Page 33: ...t DEFROST Outdoor Fan OFF Reversing Valve ON W1 line ON Monitor coil temperature and time in defrost mode HOW DID DEFROST TERMINATE Coil temperature was above 35 F 2 C for four 4 minutes of the 14 min...

Page 34: ...10 4 61693 26 2 204829 92 0 7007 42 3 24525 9 9 62712 27 0 210805 90 6 7225 41 7 24934 9 3 63752 27 8 217080 89 4 7444 41 1 25349 8 8 64812 28 7 223677 88 1 7666 40 5 25769 8 3 65895 29 5 230621 86 9...

Page 35: ...n TEST pins for longer than one second but less than two seconds Clears any short cycle lockout and five strike fault lockout function if applicable No other functions will be executed and unit will c...

Page 36: ...utdoor Coil The outdoor coil may be flushed with a water hose Outdoor Coil Sea Coast Moist air in ocean locations can carry salt which is corrosive to most metal Units that are located near the ocean...

Page 37: ...f the drain line and how to check for obstructions This would also apply to an auxiliary drain if installed Thermostat Operation See the thermostat homeowner manual for instructions on how to operate...

Page 38: ...f necessary remove the push pins along the back of the unit it is 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...

Page 39: ...sults during Y2 demand Toggle switch On Y2 Second Stage COMPRESSOR Voltage Same Amperage Higher OUTDOOR UNIT FAN MOTOR Amperage Same or Higher TEMPERATURE Ambient Same Outdoor Coil Discharge Air Highe...

Page 40: ...use or Circuit Breaker Electrical Connections Tight Indoor Filter clean Supply Voltage Unit Off Indoor Blower RPM S P Drop Over Indoor Dry Outdoor Coil Entering Air Temp Discharge Pressure Vapor Press...

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