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Service Literature
The KHA commercial heat pump is available in 2, 2.5, 3, 4
and 5 ton capacities. The KHA024/060 refrigerant systems
utilize one compressor, one reversing valve and other parts
common to a heat pump. Optional auxiliary electric heat is
field installed in KHA units. Electric heat operates in single
stage. 7.5kW through 22.5kW heat sections are available
for the KHA heat pump.
Information contained in this manual is intended for use by
qualified service technicians only. All specifications are
subject to change. Procedures outlined in this manual are
presented as a recommendation only and do not super-
sede or replace local or state codes.
If the unit must be lifted for service, rig unit by attaching four
cables to the holes located in the unit base rail (two holes at
each corner). Refer to the installation instructions for the
proper rigging technique.
WARNING
Improper installation, adjustment, alteration, service
or maintenance can cause property damage, person-
al injury or loss of life. Installation and service must
be performed by a licensed professional installer (or
equivalent), service agency or the gas supplier.
CAUTION
Danger of sharp metallic edges. Can cause injury.
Take care when servicing unit to avoid accidental
contact with sharp edges.
ELECTROSTATIC DISCHARGE (ESD)
Precautions and Procedures
CAUTION
Electrostatic discharge can affect electronic com-
ponents. Take precautions during unit installation
and service to protect the unit's electronic con-
trols. Precautions will help to avoid control expo-
sure to electrostatic discharge by putting the unit,
the control and the technician at the same electro-
static potential. Neutralize electrostatic charge by
touching hand and all tools on an unpainted unit
surface before performing any service procedure.
Corp. 0803−L1
Revised 12−2010
KHA SERIES
Optional Accessories
Electric Heat / Electrical Data
II Placement and Installation
III Start Up
. . . . . . . . . . . . . . . . . . . . .
IV System Service Checks
V Maintenance
VI Accessories
VII Wiring Diagrams
Page 1
KHA
2 /2.5/ 3 / 4 / 5
7 / 8.8 / 10.5 / 14 / 17.6 kW
WARNING
Electric shock hazard. Can cause injury
or death. Before attempting to perform
any service or maintenance, turn the
electrical power to unit OFF at discon-
nect switch(es). Unit may have multiple
power supplies.
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2010 Lennox Industries Inc.
Litho U.S.A.
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Related Manuals for Lennox KHA SERIES
Summary of Contents for Lennox KHA SERIES
- Page 1 ....Page 35 surface before performing any service procedure. VII Wiring Diagrams ... . Page 40 2010 Lennox Industries Inc. Page 1 Litho U.S.A.
- Page 2 OPTIONS / ACCESSORIES Item Catalog 024 030 036 048 060 072 COOLING SYSTEM Condensate Drain Trap PVC - C1TRAP20AD2 76W26 Copper - C1TRAP10AD2 76W27 Drain Pan Overflow Switch K1SNSR71AB1 74W42 Low Ambient Kit K1SNSR13A-1 41W34 Efficiency Standard Refrigerant Type R-410A Blower - SUPPLY AIR Motors Direct Drive - 0.25 hp...
- Page 3 OPTIONS / ACCESSORIES Item Catalog ECONOMIZER Economizer Economizer, Single Enthalpy Control T1ECON30A-1 36W96 Includes Outdoor Air Hood and T1ECON30N-1 36W97 Barometric Relief Dampers with Hood Horizontal Economizer Conversion Kit T1HECK00AN1 17W45 Economizer Controls Differential Enthalpy Sensor T1SNSR60AN1 17W71 Single Temperature Control TASEK10/15 76M37 Differential Temperature Control...
- Page 4 OPTIONS / ACCESSORIES Item Catalog 024 030 036 048 060 072 OUTDOOR AIR Outdoor Air Dampers Damper Section - Manual, T1DAMP11A-1 16W88 Includes Outdoor Air Hood T1DAMP11N-1 16W91 16W92 Damper Motorized Kit T1DAMP21AN1 Order Manual Outdoor Air Damper Separately POWER EXHAUST FAN Standard Static 208/230V-1 or 3 ph - T1PWRE10A-1P 17W39...
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Page 5: Specifications
SPECIFICATIONS - DIRECT DRIVE BLOWER 2 - 4 TON General Data Nominal Tonnage 2 Ton 2.5 Ton 3 Ton 4 Ton Model No. KHA024S4D KHA030S4D KHA036S4D KHA048S4D Efficiency Type Standard Standard Standard Standard Cooling Gross Cooling Capacity - Btuh 23,600 30,000 37,100 49,000... - Page 6 SPECIFICATIONS - BELT DRIVE BLOWER 3 - 6 TON General Data Nominal Tonnage 3 Ton 4 Ton 5 Ton 6 Ton Model No. KHA036S4B KHA048S4B KHA060S4B KHA072S4B Efficiency Type Standard Standard Standard Standard Cooling Gross Cooling Capacity - Btuh 37,100 49,000 61,500 71,300...
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Page 7: Blower Data
BLOWER DATA - DIRECT DRIVE - KHA024-030 BLOWER TABLE INCLUDES RESISTANCE FOR BASE UNIT ONLY WITH DRY INDOOR COIL AND AIR FILTERS IN PLACE. FOR ALL UNITS ADD: 1 - Any factory installed options air resistance (economizer, wet coil, etc.) See page 14. 2 - Any field installed accessories air resistance (electric heat, duct resistance, diffuser, etc.) See page 14. - Page 8 BLOWER DATA - DIRECT DRIVE - KHA036-048 BLOWER TABLE INCLUDES RESISTANCE FOR BASE UNIT ONLY WITH DRY INDOOR COIL AND AIR FILTERS IN PLACE. FOR ALL UNITS ADD: 1 - Any factory installed options air resistance (economizer, wet coil, etc.) See page 14. 2 - Any field installed accessories air resistance (electric heat, duct resistance, diffuser, etc.) See page 14.
- Page 9 BLOWER DATA - BELT DRIVE - KHA036 BLOWER TABLE INCLUDES RESISTANCE FOR BASE UNIT ONLY WITH DRY INDOOR COIL AND AIR FILTERS IN PLACE. FOR ALL UNITS ADD: 1 - Any factory installed options air resistance (economizer, wet coil, etc.). 2 - Any field installed accessories air resistance (duct resistance, diffuser, etc.).
- Page 10 BLOWER DATA - BELT DRIVE - KHA048 BLOWER TABLE INCLUDES RESISTANCE FOR BASE UNIT ONLY WITH DRY INDOOR COIL AND AIR FILTERS IN PLACE. FOR ALL UNITS ADD: 1 - Any factory installed options air resistance (economizer, wet coil, etc.). 2 - Any field installed accessories air resistance (duct resistance, diffuser, etc.).
- Page 11 BLOWER DATA - BELT DRIVE - KHA060 BLOWER TABLE INCLUDES RESISTANCE FOR BASE UNIT ONLY WITH DRY INDOOR COIL AND AIR FILTERS IN PLACE. FOR ALL UNITS ADD: 1 - Any factory installed options air resistance (economizer, wet coil, etc.). 2 - Any field installed accessories air resistance (duct resistance, diffuser, etc.).
- Page 12 BLOWER DATA - BELT DRIVE - DOWNFLOW - KHA072 BLOWER TABLE INCLUDES RESISTANCE FOR BASE UNIT ONLY WITH DRY INDOOR COIL AND AIR FILTERS IN PLACE. FOR ALL UNITS ADD: 1 - Any factory installed options air resistance (economizer, wet coil etc.). 2 - Any field installed accessories air resistance (duct resistance, diffuser, etc.).
- Page 13 BLOWER DATA - BELT DRIVE - HORIZONTAL - KHA072 BLOWER TABLE INCLUDES RESISTANCE FOR BASE UNIT ONLY WITH DRY INDOOR COIL AND AIR FILTERS IN PLACE. FOR ALL UNITS ADD: 1 - Any factory installed options air resistance (economizer, wet coil, etc.). 2 - Any field installed accessories air resistance (duct resistance, diffuser, etc.).
- Page 14 BLOWER DATA POWER EXHAUST FANS PERFORMANCE Return Air System Air Volume Exhausted - cfm Static Pressure T1PWRE10A T1PWRE10N in. w.g. 208V 230V, 460V and 575V 208V 230V, 460V and 575V Medium High Medium High Medium High Medium High 1290 1300 1320 1300 1305...
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Page 15: Electrical Data
ELECTRICAL DATA 2 - 2.5 TON DIRECT DRIVE BLOWER KHA024S KHA030S Voltage - 60hz 208/230V - 1 Ph 208/230V - 1 Ph Compressor 1 Rated Load Amps 13.5 14.1 Locked Rotor Amps 58.3 Outdoor Fan Full Load Amps (total) Motors (1) Service Outlet 115V GFI 15 Amps 15 Amps... - Page 16 ELECTRICAL DATA 3 TON KHA036S Voltage - 60hz 208/230V - 1 Ph 208/230V - 3 Ph 460V - 3 Ph 575V - 3 Ph Compressor 1 Rated Load Amps 16.7 10.4 Locked Rotor Amps 36.5 Outdoor Fan Full Load Amps (total) Motors (1) Power Full Load Amps (total)
- Page 17 ELECTRICAL DATA 4 TON KHA048S Voltage - 60hz 208/230V - 1 Ph 208/230V - 3 Ph 460V - 3 Ph 575V - 3 Ph Compressor 1 Rated Load Amps 21.8 13.7 Locked Rotor Amps 83.1 Outdoor Fan Full Load Amps (total) Motors (1) Power Full Load Amps (total)
- Page 18 ELECTRICAL/ELECTRIC HEAT DATA 5 TON KHA060S Voltage - 60hz 208/230V - 1 Ph 208/230V - 3 Ph 460V - 3 Ph 575V - 3 Ph Compressor 1 Rated Load Amps 26.3 15.6 Locked Rotor Amps 38.9 Outdoor Fan Full Load Amps (total) Motors (1) Power Full Load Amps (total)
- Page 19 ELECTRICAL/ELECTRIC HEAT DATA 6 TON KHA072S 1 Voltage - 60hz 208/230V - 3 Ph 460V - 3 Ph 575V - 3 Ph Compressor Rated Load Amps Locked Rotor Amps Outdoor Fan Full Load Amps Motor Power Exhaust Full Load Amps (1) 0.75 HP Service Outlet 115V GFI 15 Amps...
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Page 20: Electric Heat Capacities
ELECTRIC HEAT CAPACITIES Input 7.5 kW 10 kW 15 kW 22.5 kW 30 kW Voltage No of Btuh No of Btuh No of Btuh No of Btuh No of Btuh Stages input Output Stages input Output Stages input Output Stages input Output Stages... - Page 21 KHA PARTS ARRANGEMENT INDOOR COIL BLOWER DEFROST CONTROL MOTOR FILTERS BOARD (CMC1) 024, 030, 036, 048, :16 X 20 X 2" OUTDOOR FAN 060S, : 20 X 20 X 2" BLOWER INDOOR TXV OUTDOOR ECONOMIZER (OPTIONAL) CONDENSATE OUTDOOR DRAIN ELECTRIC HEAT COIL REVERSING (OPTIONAL)
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Page 22: I Unit Components
2−Transformer T1 7−Blower Contactor K3 All KHA series units use a single line voltage to 24VAC Blower contactor K3 is used in all units. K3 has a 24V coil used transformer mounted in the control box. Transformer to energize the indoor blower motor in response to blower de- supplies power to control circuits in the unit. - Page 23 11−Defrost Control CMC1 moved until after the additional 5−second period has elapsed, the defrost will terminate and the test option will The KHA defrost system includes two components: a de- not function again until the jumper is removed and re−ap- frost thermostat and a defrost control.
- Page 24 KHA PLUMBING and S49 FREEZESTAT LOCATION OUTDOOR EXPANSION EVAPORATOR COIL VALVE CONTROL SECTION INDOOR EXPANSION VALVE DRIER REVERSING VALVE INDOOR BLOWER SECTION RETURN PROCESS TUBE AIR SECTION used for charging COMPRESSOR ELECTRIC HEAT SECTION KHA−060 KHA−024, 030, 036, 048 FIGURE 5 Page 24...
- Page 25 If the freezestat is tripping frequently due to coil icing, check the airflow, filters and unit charge before allowing unit back in op- If Interlink compressor replacement is necessary, call eration. Make sure to eliminate conditions which might pro- 1−800−4−LENNOX (1−800−453−6669). mote indoor coil ice buildup. IMPORTANT 3−High Pressure Switch S4 The high pressure switch is an auto reset SPST N.C.
- Page 26 de−energizes the compressor. When the compressor is de− OPERATION / ADJUSTMENT energized the cooling demand is handled by the economiz- er. The switch automatically resets when outdoor tempera- IMPORTANT ture rises to 50° F (10° C). Three phase scroll compressors must be phased se- 8−Filter Drier (all units) quentially for correct compressor and blower rota- tion.
- Page 27 C−Determining Unit CFM − Belt Drive Blowers DIRECT DRIVE HIGH STATIC APPLICATIONS 1− The following measurements must be made with air fil- ters in place and no cooling demand. MOVE CONNECTOR TO 2− With all access panels in place, measure static pres- TERMINAL 2 FOR HIGH sure external to unit (from supply to return).
- Page 28 BLOWER ASSEMBLY TO INCREASE CFM TO DECREASE CFM LOOSEN ALLEN SCREW & TURN PULLEY TURN PULLEY CLOCKWISE COUNTERCLOCKWISE SIDE VIEW LOOSEN ALLEN SCREW TO ADJUST CFM MOTOR ALLEN SCREW PULLEY TO INCREASE BELT TENSION 1−Loosen four bolts securing motor base to mounting frame.
- Page 29 D−Optional Electric Heat Components 5−Terminal Strip TB3 P and Y voltage units are equipped with terminal strip Electric heat matchups are found in the ELECTRICAL TB3. Electric heat line voltage connections are made DATA tables. See table of contents. to TB3, which distributes power to the electric heat All electric heat sections consist of electric heating ele- components and is located on the vestibule.
- Page 30 TABLE 4 FUSE Voltage− Unit Phase each total 208/230V−1P 40 A−250V −−−−− 208/230V−3P 25 A−250V −−−−− T1EH0075 460V−3P 15 A−600V −−−−− 575V−3P 15 A−600V −−−−− T1EH0010 208/230V−1P 30 A−250V 30A−250V 208/230V−1P 40 A−250V 40A−250V 208/230V−3P 50 A−250V −−−−− T1EH0015 460V 25 A−600V −−−−−...
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Page 31: Ii Placement And Installation
II−PLACEMENT AND INSTALLATION C−Cooling Start Up Make sure the unit is installed in accordance with the installation instructions and all applicable codes. See IMPORTANT accessories section for conditions requiring use of the optional roof mounting frame (T1CURB). If unit is equipped with a crankcase heater. Make sure heater is energized 24 hours before unit start−up to III−START UP −... -
Page 32: Iv System Service Checks
IV− SYSTEMS SERVICE CHECKS TABLE 6 KHA030S NORMAL OPERATING PRESSURES Refrigerant Charge and Check Outdoor Coil WARNING−Do not exceed nameplate charge under any condition. Dis. + 10 psig Suct. +5 psig Entering Air Temp This unit is factory charged and should require no further 65_F adjustment. -
Page 33: V Maintenance
C−Charge Verification − Approach Method A−Lubrication All motors are lubricated at the factory. No further lubrica- 8− Using the same thermometer, compare liquid tempera- tion is required. ture to outdoor ambient temperature. B−Filters Approach Temperature = Liquid temperature minus Units are equipped with temporary filters which need to be ambient temperature. - Page 34 REMOVE FILTERS PULL TO REMOVE FILTERS FIGURE 13 CLEAN OUTDOOR COIL ENDPLATE IS SECURED TO MULLION TOP VIEW 1− Remove screws securing coil end plate to mullion. 2− Remove clips connecting coils slabs and separate slabs 3−4" (76−102mm). 3− Clean coils with detergent or commercial coil cleaner. SUPPLY 4−...
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Page 35: Optional Accessories
It should be sprayed with Filter Handicoat- er when dry prior to reinstallation. Filter Handicoater is R.P. Products coating no. 418 and is available as Lennox Part FIGURE 15 No. P−8−5069. - Page 36 ECONOMIZER CONTROLS OUTDOOR AIR DAMPER ENTHALPY SENSOR (OTHER MOTORIZED SIDE OF PANEL) DAMPER ASSEMBLY ENTHALPY CONTROL DAMPER MOTOR DAMPER MIXED AIR SENSOR MOTOR (R1) AND WIRING IN POWER EXHAUST WIRES THIS BUNDLE ONLY CONNECTED WHEN UNIT IS EQUIPPED WITH POWER EXHAUST FIGURE 18 MANUAL OUTDOOR AIR DAMPER −...
- Page 37 1− Set thermostat to occupied mode if the feature is avail- A6 ENTHALPY CONTROLLER able. Make sure jumper is in place between TB1 termi- nals R and OC if using a thermostat which does not have the feature. DAMPER MINI- 2−...
- Page 38 CHART 1 CALCULATE MINIMUM FRESH AIR PERCENTAGE MIXED AND RETURN AIR TEMPERATURE −20 −10 −29 −23 −18 −12 −7 −1 −20 −10 −29 −23 −18 −12 −7 −1 OUTDOOR AIR TEMPERATURE Economizer Operation B−Outdoor Air Dampers Optional manual and motorized outdoor air dampers pro- The occupied time period is determined by the thermostat vide fresh outdoor air.
- Page 39 TABLE 13 ECONOMIZER OPERATION OUTDOOR AIR IS SUITABLE FOR FREE COOLING −− FREE COOL LED ON" Á Á Á Á Á Á Á Á Á Á Á Á Á Á Á Á Á Á Á Á Á Á Á Á Á Á Á Á...
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Page 40: Vii Wiring Diagrams
VII− WIRING DIAGRAMS / SEQUENCE OF OPERATION KHA024, 036, 048, 060 P Voltage Page 40... - Page 41 KHA036, 048, 060 Y Voltage Page 41...
- Page 42 KHA036, 048, 060 G, J Voltage Page 42...
- Page 43 SEQUENCE OF OPERATION KHA024/060 Power: First Stage Heat NOTE: On heating demand after unit has been in cool- 1. Line voltage from unit disconnect energizes transform- ing mode, indoor thermostat in HEATING mode will de− er T1. T1 provides 24VAC power to terminal strip TB1 found in the control box.
- Page 44 ELECTRONIC OR ELECTROMECHANICAL THERMOSTAT POWER: Terminal strip TB1 found in the main control box supplies thermostat components with 24VAC. OPERATION: TB1 receives data from the electronic thermostat A2 (Y1, Y2, W1, W2, G) and energizes the appropriate components for heat or cool demand. Page 44...
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Page 45: Sequence Of Operation
ECONOMIZER SEQUENCE OF OPERATION POWER: Terminal strip TB1 found in the main control box energizes the economizer components with 24VAC. OPERATION: Enthalpy sensor A7 and A62 (if differential enthalpy is used) communicates to the economizer control module A6 when to power the damper motor B7. Economizer control module A6 supplies B7 with 0 −... - Page 46 T1EH−7.5, 10, 15, 22.5 kW P VOLTAGE Page 46...
- Page 47 T1EHA−7.5, 15, 22.5kW Y VOLTAGE KHA SERIES UNITS Page 47...
- Page 48 T1EHA−7.5, 15, 22.5kW G, J VOLTAGE KHA SERIES UNITS Page 48...
- Page 49 Sequence of Operation −T1EH 7.5, 10, 15, 22.5kW − P Voltage HEATING ELEMENTS: END OF FIRST STAGE HEAT: 1 − Terminal Strip TB2 is energized when the unit discon- 5 − Heating demand is satisfied. Terminal W1 in the ther- nect closes.
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