Page 1
Corp. 0803−L1
Service Literature
Revised 12−2010
KHA SERIES
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 supersede 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.
KHA
2 /2.5/ 3 / 4 / 5
7 / 8.8 / 10.5 / 14 / 17.6 kW
WARNING
Improper installation, adjustment, alteration, service
or maintenance can cause property damage, personal 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 components. Take precautions during unit installation
and service to protect the unit’s electronic controls. Precautions will help to avoid control exposure to electrostatic discharge by putting the unit,
the control and the technician at the same electrostatic potential. Neutralize electrostatic charge by
touching hand and all tools on an unpainted unit
surface before performing any service procedure.
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 disconnect switch(es). Unit may have multiple
power supplies.
Table of Contents
Optional Accessories Page 2. . . . . . . . . . .
Specifications Page 5. . . . . . . . . . . . . . . . . .
Blower Data Page 7. . . . . . . . . . . . . . . . . . .
Electric Heat / Electrical Data Page 15. . . .
Electric Heat Capacities Page 20. . . . . . . . .
I Unit Components Page 22. . . . . . . . . . . . . .
II Placement and Installation Page 31. . . . .
III Start Up Page 31. . . . . . . . . . . . . . . . . . . . .
IV System Service Checks Page 32. . . . . . .
V Maintenance Page 33. . . . . . . . . . . . . . . . .
VI Accessories Page 35. . . . . . . . . . . . . . . . .
VII Wiring Diagrams Page 40. . . . . . . . . . . .
Page 1
2010 Lennox Industries Inc.
Litho U.S.A.
Page 2
OPTIONS / ACCESSORIES
Item Catalog
No.
COOLING SYSTEM
Condensate Drain Trap PVC - C1TRAP20AD2 76W26 X X X X X X
Copper - C1TRAP10AD2 76W27 X X X X X X
Drain Pan Overow Switch K1SNSR71AB1 74W42 X X X X X X
Low Ambient Kit K1SNSR13A-1 41W34 X X X X X X
Efciency Standard O O O O O O
Refrigerant Type R-410A O O O O O O
Blower - SUPPLY AIR
Motors Direct Drive - 0.25 hp O O
Direct Drive - 0.5 hp O O
Belt Drive - 1.5 hp Standard Efciency O O O O
1
Belt Drive - 2 hp Standard Efciency O O O O
Drive Kits
See Blower Data Tables
for selection
Kit A01 - T1DRKT001-1 - 673-1010 rpm Factory O
Kit A02 - T1DRKT002-1 - 745-1117 rpm Factory O
Kit A03 - T1DRKT003-1 - 833-1250 rpm Factory O
Kit A04 - T1DRKT004-1 - 968-1340 rpm Factory O
Kit A05 - T1DRKT005-1 - 897-1346 rpm Factory O
Kit A06 - T1DRKT006-1 - 1071-1429 rpm Factory O
Kit A07 - T1DRKT007-1 - 1212-1548 rpm Factory O
Kit A08 - T1DRKT008-1 - 1193-1591 rpm Factory O
CABINET
Coil Guards T1GARD20A-1 17W87 X X X X
T1GARD20N-1 17W88 X
K1GARD20AP1 53W21 X
Corrosion Protection O O O O O O
Hail Guards T1GARD10A-1 17W89 X X X X
T1GARD10N-1 17W90 X
K1GARD10AP1 53W22 X
Hinged Access Panels O O O O O O
CONTROLS
Smoke Detector - Supply or Return (Power
C1SNSR44AP1 53W78 X X X X X X
board and one sensor)
Smoke Detector - Supply and Return
C1SNSR43AP1 53W79 X X X X X X
(Power board and two sensors)
Indoor Air Quality
Indoor Air Quality (Co
Sensor - Wall-mount, off-white plastic cover
) Sensors
2
C0SNSR50AS1L 77N39 X X X X X X
with LCD display
Sensor - Wall-mount, black plastic case, no
C0SNSR53AE1L 87N54 X X X X X X
display, rated for plenum mounting
Sensor Duct Mounting Kit - for
CO
2
downow applications
Aspiration Box - for duct mounting non-
C0MISC19AE1- 85L43 X X X X X X
C0MISC16AE1- 90N43 X X X X X X
plenum rated CO2 sensor (77N39)
UVC Germicidal Lamps
2
Healthy Climate® UVC Light Kit
E1UVCL10AN1 50W90 X X X X X X
(208/230v-1ph)
NOTE - The catalog and model numbers that appear here are for ordering eld installed accessories only.
OX - Field Installed or Congure to Order (factory installed)
O - Congure to Order (Factory Installed)
X - Field Installed
1
2 hp blower motor is not available for 208/230V-1ph applications.
2
Lamps operate on 110-230V single-phase power supply. Step-down transformer may be ordered separately for 460V and 575V units. Alternately, 110V power supply
may be used to directly power the UVC ballast(s).
024 030 036 048 060 072
Page 2
Page 3
OPTIONS / ACCESSORIES
Item Catalog
No.
ECONOMIZER
Economizer
Economizer, Single Enthalpy Control
Includes Outdoor Air Hood and
Barometric Relief Dampers with Hood
T1ECON30A-1 36W96 OX OX OX OX
T1ECON30N-1 36W97 OX OX
Horizontal Economizer Conversion Kit T1HECK00AN1 17W45 X X X X X X
Economizer Controls
Differential Enthalpy Sensor T1SNSR60AN1 17W71 X X X X X X
Single Temperature Control TASEK10/15 76M37 X X X X X X
Differential Temperature Control Order 2 - TASEK10/15 76M37 X X X X X X
ELECTRICAL
Disconnect See Electrical/Electric Heat Tables for selection X X X X X X
Voltage
60 hz
208/230V - 1 phase O O O O O
208/230V - 3 phase O O O O
460V - 3 phase O O O O
575V - 3 phase O O O O
GFI Service Outlets LTAGFIK10/15 74M70 X X X X X X
ELECTRIC HEAT
7.5 kW 208/230V-1ph - T1EH0075AN1P 14W32 X X X X X
208/230V-3ph - T1EH0075AN1Y 14W35 X X X X
460V-3ph - T1EH0075AN1G 14W39 X X X X
575V-3ph - T1EH0075AN1J 14W43 X X X X
10 kW 208/230V-1ph - T1EH0100A1P 30W26 X X
15 kW 208/230V-1ph - T1EH0150AN1P 14W33 X X X
208/230V-3ph - T1EH0150AN1Y 14W36 X X X X
460V-3ph - T1EH0150AN1G 14W40 X X X X
575V-3ph - T1EH0150AN1J 14W44 X X X X
22.5 kW 208/230V-1ph - T1EH0225AN1P 14W34 X
208/230V-3ph - T1EH0225AN1Y 14W37 X X
460V-3ph - T1EH0225AN1G 14W41 X X
575V-3ph - T1EH0225AN1J 14W45 X X
30 kW 208/230V-3ph - T1EH0300N-1Y 14W38 X
460V-3ph - T1EH0300N-1G 14W42 X
575V-3ph - T1EH0300N-1J 14W46 X
ELECTRIC HEAT ACCESSORIES
Unit Fuse Block - See Electrical/Electric Heat Tables for Selection X X X X X
NOTE - The catalog and model numbers that appear here are for ordering eld installed accessories only.
OX - Field Installed or Congure to Order (factory installed)
O - Congure to Order (Factory Installed)
X - Field Installed.
024 030 036 048 060 072
Page 3
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OPTIONS / ACCESSORIES
Item Catalog
No.
OUTDOOR AIR
Outdoor Air Dampers
Damper Section - Manual,
Includes Outdoor Air Hood
Damper Motorized Kit
T1DAMP11A-1 16W88 X X X X
T1DAMP11N-1 16W91 X X
T1DAMP21AN1 16W92 X X X X X X
Order Manual Outdoor Air Damper Separately
POWER EXHAUST FAN
Standard Static 208/230V-1 or 3 ph - T1PWRE10A-1P 17W39 X X
460V-3ph - T1PWRE10A-1G 17W40 X X
575V-3ph - T1PWRE10A-1J 17W41 X X
208/230V-1 or 3 ph - T1PWRE10N-1P 17W42 X X
460V-3ph - T1PWRE10N-1G 17W43 X X
575V-3ph - T1PWRE10N-1J 17W44 X X
CEILING DIFFUSERS
Step-Down - Order one RTD9-65-R 27G87 X X X X X
RTD11-95 29G04 X
(Canada Only) RTD11-95S 13K61 X
Flush - Order one FD9-65-R 27G86 X X X X X
FD11-95 29G08 X
(Canada Only) FD11-95S 13K56 X
Transitions (Supply and Return) - Order one T1TRAN10AN1 17W53 X X X X X
T1TRAN20N-1 17W54 X
ROOF CURBS - downFlow
Cliplock
8 in. height T1CURB23AN1 16W93 X X X X X
K1CURB23AP1 52W20 X
14 in. height T1CURB20AN1 16W94 X X X X X
K1CURB20AP1 52W21 X
18 in. height T1CURB21AN1 16W95 X X X X X
K1CURB21AP1 52W22 X
24 in. height T1CURB22AN1 16W96 X X X X X
K1CURB22AP1 52W23 X
Hinged
8 in. height T1CURB30AN1 17W46 X X X X X
K1CURB30AP1 52W17 X
18 in. height T1CURB32AN1 17W47 X X X X X
K1CURB32AP1 52W18 X
24 in. height T1CURB33AN1 17W48 X X X X X
K1CURB33AP1 52W19 X
Standard
14 in. height T1CURB10AN1 13W27 X X X X X
K1CURB10AP1 52W24 X
Adjustable Pitched Curb
14 in. height C1CURB55AT1 43W27 X X X X X
NOTE - The catalog and model numbers that appear here are for ordering eld installed accessories only.
X - Field Installed.
1
072 models will t smaller roof curbs with overhang. See dimension drawing.
024 030 036 048 060 072
1
X
1
X
1
X
1
X
1
X
1
X
1
X
1
X
1
X
Page 4
Page 5
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
Efciency Type Standard Standard Standard Standard
Cooling
Performance
Refrigerant Type R-410A R-410A R-410A R-410A
Heating
Performance
Electric Heating Options See Electrical/Electric Heat Tables page 15
Compressor Type (no.) Scroll (1) Scroll (1) Scroll (1) Scroll (1)
Outdoor
Coil
Outdoor
Coil Fan
Indoor Coil
Indoor
Blower
Filters Type Disposable Disposable
Electrical Characteristics - 60 hz 208/230V - 1 phase 208/230V
NOTE - Net capacity includes evaporator blower motor heat deduction. Gross capacity does not include evaporator blower motor heat deduction.
1
Certied in accordance with the USE certication program, which is based on AHRI Standard 210/240.
Cooling Ratings - 95°F outdoor air temperature and 80°F db/67°F wb entering indoor coil air.
High Temperature Heating Ratings - 47°F db/43°F wb outdoor air temperature and 70°F entering indoor coil air.
Low Temperature Heating Ratings - 17°F db/15°F wb outdoor air temperature and 70°F entering indoor coil air.
2
Sound Rating Number rated in accordance with test conditions included in AHRI Standard 270.
Gross Cooling Capacity - Btuh 23,600 30,000 37,100 49,000
1
Net Cooling Capacity - Btuh 22,800 29,000 35,600 47,000
AHRI Rated Air Flow - cfm 800 1000 1160 1600
2
Sound Rating Number (dB) 75 75 75 75
Total Unit Power - kW 2.0 2.6 3.3 4.4
1
SEER (Btuh/Watt) 13.0 13.0 13.0 13.0
1
EER (Btuh/Watt) 11.2 11.3 10.9 10.7
Charge Furnished 13 lbs. 0 oz. 13 lbs. 0 oz. 12 lbs. 8 oz. 13 lbs. 2 oz.
Total High Heating Capacity - Btuh 24,000 29,200 36,400 48,000
Total Unit Power - kW 2.1 2.5 3.0 4.0
1
COP 3.4 3.5 3.6 3.5
1
HSPF - Region IV (Region V) 7.7 (6.7) 7.7 (6.7) 7.7 (6.7) 7.7 (6.7)
Total Low Heating Capacity - Btuh 14,400 17,600 22,000 29,500
Total Unit Power - kW 1.8 2.3 2.8 3.6
COP 2.3 2.3 2.3 2.4
Net face area - sq. ft. 15.6 15.6 15.6 15.6
Tube diameter - in. 3/8 3/8 3/8 3/8
Number of rows 2.0 2.0 2.0 2.0
Fins / inch 20 20 20 20
Motor HP 1/4 1/4 1/4 1/4
Motor rpm 825 825 825 825
Total motor watts 250 250 250 250
Diameter - in. / No. of blades 24 - 3 24 - 3 24 - 3 24 - 3
Total air volume - cfm 3300 3300 3300 3300
Net face area - sq. ft. 7.78 7.78 7.78 7.78
Tube diameter - in. 3/8 3/8 3/8 3/8
Number of rows 3 3 3 3
Fins / inch 14 14 14 14
Drain Connection (no. and size) - in. (1) 3/4 NPT (1) 3/4 NPT (1) 3/4 NPT (1) 3/4 NPT
Expansion device type Balanced Port Thermostatic Expansion Valve, removeable power head
Nominal Motor HP .25 .25 .5 .5
Wheel nom. diameter x width - in. 10 x 10 10 x 10 10 x 10 10 x 10
Number and size - in. (4) 16 x 20 x 2 (4) 16 x 20 x 2
208/230V
1 phase
208/230V,
460V & 575V
3 phase
1 phase
208/230V,
460V & 575V
3 phase
Page 5
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
Efciency Type Standard Standard Standard Standard
Cooling
Performance
Refrigerant Type R-410A R-410A R-410A R-410A
Heating
Performance
Electric Heating Options See Electrical/Electric Heat Tables page 15
Compressor Type (no.) Scroll (1) Scroll (1) Scroll (1) Scroll (1)
Outdoor Coil Net face area - sq. ft. 15.6 15.6 19.27 28.00
Outdoor Coil
Fan
Indoor Coil Net face area - sq. ft. 7.78 7.78 9.7 9.7
5
Indoor
Blower &
Drive
Selection
Filters Type Disposable Disposable
Number and size - in. (4) 16 x 20 x 2 (4) 20 x 20 x 2
Electrical Characteristics - 60 hz 208/230V
NOTE - Net capacity includes evaporator blower motor heat deduction. Gross capacity does not include evaporator blower motor heat deduction.
1
Certied in accordance with the USE certication program, which is based on AHRI Standard 210/240 or 2 340/360.
Cooling Ratings - 95°F outdoor air temperature and 80°F db/67°F wb entering indoor coil air.
High Temperature Heating Ratings - 47°F db/43°F wb outdoor air temperature and 70°F entering indoor coil air.
Low Temperature Heating Ratings - 17°F db/15°F wb outdoor air temperature and 70°F entering indoor coil air.
3
Integrated Energy Efciency Ratio certied and tested according to AHRI Standard 210/240.
4
Sound Rating Number rated in accordance with test conditions included in AHRI Standard 270.
5
Using total air volume and system static pressure requirements determine from blower performance tables rpm and motor hp required. Maximum usable hp of motors
furnished are shown. In Canada, nominal motor hp is also maximum usable motor hp. If motors of comparable hp are used, be sure to keep within the service factor
limitations outlined on the motor nameplate.
6
2 hp blower motor is not available for 208/230V-1phase applications.
Gross Cooling Capacity - Btuh 37,100 49,000 61,500 71,300
1
Net Cooling Capacity - Btuh
1
35,600
1
47,000
1
59,000
2
69,000
AHRI Rated Air Flow - cfm 1160 1600 1985 2060
4
Sound Rating Number (dB) 75 75 82 83
Total Unit Power - kW 3.3 4.4 5.4 6.3
1
SEER (Btuh/Watt) 13.0 13.0 13.0 - - -
3
IEER (Btuh/Watt) - - - - - - - - - 11.2
EER (Btuh/Watt)
1
10.9
1
10.7
1
10.9
2
11.0
Charge Furnished 12 lbs. 8 oz. 13 lbs. 2 oz. 16 lbs. 0 oz. 20 lbs. 8 oz.
Total High Heating Capacity - Btuh 36,400 48,000 60,500 70,000
Total Unit Power - kW 3.0 4.0 4.9 6.2
1
COP 3.6 3.5 3.6 3.3
HSPF - Region IV (Region V) 7.7 (6.7) 7.7 (6.7) 7.7 (6.7) - - -
Total Low Heating Capacity - Btuh 22,000 29,500 36,000 40,000
Total Unit Power - kW 2.8 3.6 4.5 5.7
1
COP 2.3 2.4 2.4 2.25
Tube diameter - in. 3/8 3/8 3/8 3/8
Number of rows 2 2 2 2
Fins / inch 20 20 20 20
Motor HP 1/4 1/4 1/3 1/2
Motor rpm 825 825 1075 1075
Total motor watts 250 250 405 680
Diameter - in. / No. of blades 24 - 3 24 - 3 24 - 3 24 - 4
Total air volume - cfm 3300 3300 4800 5735
Tube diameter - in. 3/8 3/8 3/8 3/8
Number of rows 3 3 4 4
Fins / inch 14 14 14 14
Drain Connection (no. and size) - in. (1) 3/4 NPT (1) 3/4 NPT (1) 3/4 NPT (1) 3/4 NPT
Expansion device type Balanced Port Thermostatic Expansion Valve, removeable power head
Nominal Motor HP 1.5 hp, 6 2 hp 1.5 hp, 6 2 hp 1.5 hp, 2 hp
Maximum Usable Motor HP 1.72 hp, 2.3 hp 1.72 hp, 2.3 hp 1.72 hp, 2.3 hp
Available Drive Kits A01
673 - 1010 rpm
A05
897 - 1346 rpm
A02
745 - 1117 rpm
A06
1071 - 1429 rpm
A03
833 - 1250 rpm
A07
1212 - 1548 rpm
A04
968 - 1340 rpm
A08
1193 - 1591 rpm
Wheel nom. diameter x width - in. 10 x 10 10 x 10 10 x 10 10 x 10
1 phase
208/230V,
460V & 575V
3 phase
208/230V
1 phase
208/230V,
460V & 575V
3 phase
208/230V
1 phase
208/230V,
460V & 575V
3 phase
208/230V,
460V & 575V
3 phase
Page 6
Page 7
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 eld installed accessories air resistance (electric heat, duct resistance, diffuser, etc.) See page 14.
External Static
Pressure (in.
w.g.)
2 and 2.5 Ton Standard Efciency (Downow) KHA024S and KHA030S
0.0 1199 928 838 1379 1085 877
0.1 1229 926 813 1409 1086 872
0.2 1206 928 782 1367 1094 850
0.3 1183 881 742 1350 1047 820
0.4 1159 843 686 1321 1009 783
0.5 1136 812 643 1282 981 762
0.6 1103 766 569 1242 921 705
0.7 1046 728 496 1195 888 625
0.8 953 648 432 1134 792 583
0.9 909 584 335 1037 738 492
1.0 783 465 247 926 592 411
2 and 2.5 Ton Standard Efciency (Horizontal) KHA024S and KHA030S
0.0 1152 909 801 1325 1063 838
0.1 1152 893 770 1321 1048 826
0.2 1136 866 734 1288 1021 798
0.3 1104 826 697 1260 982 771
0.4 1072 787 643 1222 942 734
0.5 1041 747 589 1175 903 698
0.6 1009 707 534 1137 850 662
0.7 946 654 467 1081 797 588
0.8 861 588 396 1024 718 535
0.9 798 508 319 911 642 468
1.0 715 443 237 846 564 394
High Medium Low High Medium Low
208 VOLTS 230 VOLTS
Air Volume (cfm) at Various Blower Speeds
Page 7
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 eld installed accessories air resistance (electric heat, duct resistance, diffuser, etc.) See page 14.
External Static
Pressure (in.
w.g.)
3 and 4 Ton Standard Efciency (Downow) KHA036S and KHA048S
0.0 1938 1552 1119 2167 1772 1317 2136 1716 1212
0.1 1992 1586 1128 2167 1780 1315 2104 1728 1208
0.2 1915 1592 1137 2100 1792 1307 2052 1684 1197
0.3 1865 1536 1083 2043 1735 1266 1994 1647 1172
0.4 1813 1495 1033 1986 1678 1204 1918 1597 1134
0.5 1762 1444 976 1909 1621 1164 1861 1534 1096
0.6 1694 1391 899 1814 1535 1082 1765 1485 1059
0.7 1609 1331 817 1718 1478 1000 1689 1410 996
0.8 1471 1220 730 1603 1364 918 1613 1335 920
0.9 1368 1066 522 1488 1250 755 1498 1235 848
1.0 1108 869 402 1259 1021 640 1345 1036 763
3 and 4 Ton Standard Efciency (Horizontal) KHA036S and KHA048S
0.0 1862 1520 1070 2082 1736 1259 2085 1745 1247
0.1 1867 1530 1069 2031 1717 1246 2070 1744 1257
0.2 1804 1485 1067 1978 1672 1227 2016 1690 1225
0.3 1741 1440 1018 1907 1627 1190 1944 1643 1192
0.4 1677 1396 968 1837 1567 1128 1890 1596 1160
0.5 1614 1329 894 1749 1492 1066 1800 1533 1111
0.6 1550 1284 844 1660 1417 1016 1727 1455 1062
0.7 1455 1195 769 1554 1327 941 1655 1377 996
0.8 1329 1106 670 1448 1237 842 1511 1283 865
0.9 1202 927 496 1307 1087 718 1403 1190 784
1.0 1012 828 385 1150 973 613 1222 1002 670
High Medium Low High Medium Low High Medium Low
208 VOLTS 230 VOLTS 460/575 VOLTS
Air Volume (cfm) at Various Blower Speeds
Page 8
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 eld installed accessories air resistance (duct resistance, diffuser, etc.).
See page 13 for blower motors and drives and page 14 for wet coil and options/accessory air resistance data.
DOWNFLOW
Air
Volume
cfm
900 486 0.12 554 0.16 623 0.20 695 0.22 767 0.23 836 0.25 897 0.28 953 0.30
1000 508 0.15 576 0.19 643 0.22 713 0.24 783 0.26 848 0.28 907 0.30 961 0.33
1100 533 0.18 599 0.22 665 0.25 733 0.27 800 0.28 863 0.31 919 0.34 971 0.36
1200 560 0.21 625 0.25 689 0.28 755 0.30 820 0.32 879 0.34 932 0.37 983 0.40
1300 591 0.24 654 0.28 716 0.31 779 0.33 841 0.35 897 0.38 948 0.41 996 0.44
1400 631 0.26 690 0.30 748 0.34 807 0.36 864 0.39 916 0.42 964 0.46 1011 0.49
1500 676 0.28 729 0.33 782 0.36 835 0.40 887 0.43 935 0.47 981 0.50 1028 0.54
Air
Volume
cfm
900 1004 0.33 1055 0.35 1106 0.37 1152 0.40 1193 0.43 1232 0.46 1269 0.49 1305 0.52
1000 1011 0.36 1062 0.38 1111 0.41 1157 0.43 1199 0.47 1238 0.50 1276 0.53 1311 0.56
1100 1020 0.39 1070 0.41 1118 0.44 1163 0.47 1206 0.51 1245 0.54 1282 0.58 1318 0.61
1200 1031 0.43 1079 0.45 1127 0.48 1171 0.52 1213 0.55 1252 0.59 1289 0.62 1324 0.66
1300 1044 0.47 1091 0.49 1137 0.53 1181 0.56 1221 0.60 1259 0.64 1296 0.68 1330 0.71
1400 1058 0.51 1105 0.54 1150 0.57 1191 0.61 1231 0.65 1268 0.69 1303 0.73 1337 0.77
1500 1074 0.56 1120 0.59 1163 0.63 1203 0.67 1241 0.71 1277 0.75 1312 0.79 1345 0.82
HORIZONTAL
Air
Volume
cfm
900 485 0.11 554 0.14 627 0.16 703 0.18 780 0.21 841 0.23 888 0.27 935 0.30
1000 509 0.13 578 0.16 649 0.19 722 0.21 796 0.23 854 0.26 900 0.29 947 0.33
1100 537 0.16 605 0.19 674 0.21 744 0.24 813 0.26 868 0.29 913 0.33 959 0.36
1200 567 0.19 633 0.22 700
1300 599 0.22 664 0.25 729 0.28 793 0.30 853 0.33 902 0.37 945 0.41 990 0.44
1400 634 0.26 697 0.29 758 0.31 819 0.34 875 0.38 921 0.42 964 0.46 1008 0.49
1500 669 0.30 730 0.33 789 0.36 846 0.39 897 0.42 941 0.47 983 0.51 1028 0.54
Air
V
olume
cfm
900 986 0.32 1039 0.35 1090 0.37 1137 0.40 1177 0.43 1214 0.46 1248 0.49 1280 0.51
1000 997 0.35 1048 0.38 1098 0.41 1143 0.44 1184 0.47 1221 0.50 1255 0.53 1287 0.56
1100 1008 0.39 1059 0.41 1107 0.44 1150 0.47 1191 0.51 1228 0.54 1263 0.57 1295 0.60
1200 1022 0.43 1071 0.45 1117 0.48 1160 0.52 1200 0.55 1237 0.59 1271 0.62 1303 0.66
1300 1037 0.47 1085 0.50 1130 0.53 1171 0.57 1210 0.60 1246 0.64 1280 0.68 1312 0.71
1400 1054 0.52 1100 0.54 1144 0.58 1183 0.62 1221 0.66 1256 0.70 1290 0.73 1321 0.77
1500 1073 0.57 1117 0.60 1159 0.64 1197 0.67 1234 0.71 1268 0.75 1301 0.79 1332 0.83
0.10 0.20 0.30 0.40 0.50 0.60 0.70 0.80
RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP
Field Furnished Kit A01
0.90 1.00 1.10 1.20 1.30 1.40 1.50 1.60
RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP
Kit A01 Kit A05
0.10 0.20 0.30 0.40 0.50 0.60 0.70 0.80
RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP
Field Furnished Kit A01
0.24 768 0.27 833 0.30 884 0.33 928 0.37 974 0.40
0.90 1.00 1.10 1.20 1.30 1.40 1.50 1.60
RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP
Kit A01 Kit A05
External Static - in. w.g.
External Static - in. w.g.
External Static - in. w.g.
External Static - in. w.g.
Page 9
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 eld installed accessories air resistance (duct resistance, diffuser, etc.).
See page 13 for blower motors and drives and page 14 for wet coil and options/accessory air resistance data.
DOWNFLOW
Air
Volume
cfm
1200 560 0.21 625 0.25 689 0.28 755 0.30 820 0.32 879 0.34 932 0.37 983 0.40
1300 591 0.24 654 0.28 716 0.31 779 0.33 841 0.35 897 0.38 948 0.41 996 0.44
1400 631 0.26 690 0.30 748 0.34 807 0.36 864 0.39 916 0.42 964 0.46 1011 0.49
1500 675 0.28 729 0.33 782 0.36 835 0.40 887 0.43 935 0.47 981 0.50 1028 0.54
1600 718 0.31 766 0.35 814 0.40 862 0.44 910 0.48 955 0.52 1000 0.55 1046 0.59
1700 756 0.34 799 0.39 843 0.44 887 0.49 932 0.53 976 0.57 1020 0.61 1066 0.64
1800 787 0.40 828 0.45 870 0.50 912 0.55 955 0.59 999 0.63 1043 0.67 1089 0.70
1900 815 0.46 855 0.51 897 0.57 939 0.62 981 0.66 1024 0.69 1068 0.73 111 3 0.76
2000 843 0.53 884 0.59 925 0.64 968 0.68 1009 0.72 1052 0.76 1095 0.79 1138 0.83
Air
Volume
cfm
1200 1031 0.43 1079 0.45 1127 0.48 1171 0.52 1213 0.55 1252 0.59 1289 0.62 1324 0.66
1300 1044 0.47 1091 0.49 1137 0.53 1181 0.56 1221 0.60 1259 0.64 1296 0.68 1330 0.71
1400 1058 0.51 1105 0.54 1150 0.57 1191 0.61 1231 0.65 1268 0.69 1303 0.73 1337 0.77
1500 1074 0.56 1120 0.59 1163 0.63 1203 0.67 1241 0.71 1277 0.75 1312 0.79 1345 0.82
1600 1092 0.61 1137 0.65 1178 0.68 1216 0.72 1253 0.76 1288 0.80 1321 0.84 1354 0.88
1700 111 2 0.67 1155 0.70 1193 0.75 1230 0.79 1265 0.83 1299 0.87 1332 0.91 1364 0.95
1800 1133 0.73 1174 0.77 1209 0.81 1244 0.85 1278 0.90 1311 0.94 1343 0.98 1375 1.02
1900 1156 0.80 1193 0.84 1226 0.89 1260 0.93 1293 0.97 1325 1.01 1356 1.06 1388 1.10
2000 1178 0.87 1213 0.92 1243 0.97 1275 1.02 1307 1.06 1339 1.10 1370 1.14 1402 1.18
HORIZONTAL
Air
Volume
cfm
1200 567 0.19 633 0.22 700 0.24 768 0.27 833 0.30 884 0.33 928 0.37 974 0.40
1300 599 0.22 664 0.25 729 0.28 793 0.30 853 0.33 902 0.37 945 0.41 990 0.44
1400 634 0.26 697 0.29 758 0.31 819 0.34 875 0.38 921 0.42 964 0.46 1008 0.49
1500 669 0.30 730 0.33 789 0.36 846 0.39 897 0.42 941 0.47 983 0.51 1028 0.54
1600 705 0.34 763 0.37 819 0.40 873 0.43 921 0.48 963 0.52 1004 0.56 1048 0.59
1700 741 0.38 796 0.41 850 0.45 900 0.49 945 0.53 985 0.58 1026 0.62 1070 0.65
1800 776 0.43 829 0.46 880 0.51 927 0.55 970 0.60 1009 0.64 1050 0.68 1093 0.71
1900 812 0.48 862 0.52 910 0.57 955 0.62 996 0.66 1035 0.71 1076 0.74 111
2000 847 0.54 895 0.59 941 0.64 984 0.69 1023 0.74 1062 0.78 1103 0.81 1144 0.85
Air
Volume
cfm
1200 1022 0.43 1071 0.45 1117 0.48 1160 0.52 1200 0.55 1237 0.59 1271 0.62 1303 0.66
1300 1037 0.47 1085 0.50 1130 0.53 1171 0.57 1210 0.60 1246 0.64 1280 0.68 1312 0.71
1400 1054 0.52 1100 0.54 1144 0.58 1183 0.62 1221 0.66 1256 0.70 1290 0.73 1321 0.77
1500 1073 0.57 1117 0.60 1159 0.64 1197 0.67 1234 0.71 1268 0.75 1301 0.79 1332 0.83
1600 1093 0.62 1136 0.66 1175 0.70 1212 0.74 1247 0.78 1281 0.82 1313 0.86 1344 0.90
1700 111 4 0.68 1155 0.72 1192 0.76 1227 0.80 1262 0.85 1295 0.89 1327 0.93 1358 0.97
1800 1136 0.75 1175 0.79 1210 0.83 1245 0.88 1278 0.92 1311 0.97 1342 1.01 1373 1.05
1900 1159 0.82 1197 0.86 1229 0.92 1263 0.97 1296 1.01 1328 1.06 1359 1.10 1390 1.14
2000 1183 0.90 1218 0.95 1249 1.01 1282 1.06 1314 1.11 1346 1.15 1377 1.20 1408 1.24
0.10 0.20 0.30 0.40 0.50 0.60 0.70 0.80
RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP
Field Furnished Kit A02
0.90 1.00 1.10 1.20 1.30 1.40 1.50 1.60
RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP
Kit A02 Kit A06
0.10 0.20 0.30 0.40 0.50 0.60 0.70 0.80
RPM BHP RPM BHP RPM BHP RPM
Field Furnished Kit A02
0.90 1.00 1.10 1.20 1.30 1.40 1.50 1.60
RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP
Kit A02 Kit A06
External Static - in. w.g.
External Static - in. w.g.
External Static - in. w.g.
BHP RPM BHP RPM BHP RPM BHP RPM BHP
8 0.78
External Static - in. w.g.
Page 10
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 eld installed accessories air resistance (duct resistance, diffuser, etc.).
See page 13 for blower motors and drives and page 14 for wet coil and options/accessory air resistance data.
DOWNFLOW
Air
Volume
cfm
1600 665 0.30 716 0.34 768 0.38 819 0.41 879 0.44 937 0.46 985 0.49 1022 0.52
1700 723 0.31 768 0.35 814 0.39 860 0.43 910 0.47 959 0.50 1001 0.54 1037 0.58
1800 779 0.32 818 0.37 857 0.41 897 0.46 939 0.50 980 0.55 1018 0.59 1054 0.64
1900 826 0.36 859 0.41 894 0.45 928 0.50 964 0.56 1000 0.61 1036 0.66 1072 0.70
2000 857 0.42 889 0.47 920 0.52 952 0.57 986 0.62 1020 0.68 1055 0.73 1091 0.77
2100 878 0.49 909 0.54 940 0.59 973 0.64 1006 0.70 1041 0.75 1076 0.80 1112 0.85
2200 897 0.55 929 0.61 961 0.66 994 0.72 1028 0.78 1063 0.83 1099 0.89 1134 0.93
2300 918 0.62 950 0.68 983 0.74 1017 0.80 1052 0.86 1087 0.92 1122 0.97 1157 1.02
2400 941 0.70 974 0.77 1008 0.83 1042 0.90 1077 0.96 1111 1.01 1146 1.06 1181 1.11
Air
Volume
cfm
1600 1059 0.57 1098 0.61 1138 0.65 1177 0.68 1218 0.71 1257 0.75 1290 0.79 1319 0.83
1700 1074 0.62 1113 0.66 1152 0.70 1190 0.74 1231 0.77 1268 0.80 1299 0.84 1328 0.89
1800 1091 0.68 1129 0.72 1167 0.76 1205 0.80 1244 0.83 1280 0.87 1310 0.91 1338 0.95
1900 1109 0.75 1146 0.79 1183 0.82 1221 0.86 1260 0.90 1294 0.94 1323 0.98 1349 1.02
2000 1128 0.82 1164 0.86 1201 0.89 1239 0.93 1276 0.97 1310 1.01 1336 1.06 1362 1.10
2100 1148 0.89 1185 0.93 1221 0.97 1258 1.01 1294 1.05 1325 1.09 1351 1.14 1376 1.19
2200 1170 0.97 1206 1.01 1242 1.05 1277 1.09 1311 1.14 1341 1.18 1365 1.23 1390 1.28
2300 1193 1.06 1228 1.09 1262 1.14 1295 1.19 1327 1.24 1355 1.29 1380 1.33 1406 1.37
2400 1216 1.15 1250 1.19 1282 1.24 1313 1.30 1343 1.36 1371 1.40 1396 1.44 1423 1.48
HORIZONTAL
Air
Volume
cfm
1600 712 0.29 758 0.32 807 0.36 855 0.39 906 0.43 955 0.46 997 0.50 1035 0.54
1700 766 0.32 808 0.36 850 0.40 892 0.44 936 0.47 978 0.51 1016 0.56 1052 0.60
1800 814 0.36 851 0.40 888 0.44 925 0.49 963 0.53 1000 0.57 1035 0.62 1071 0.66
1900 853 0.41 886 0.46 919 0.50 952 0.55 986 0.60 1021 0.64 1056 0.69 1091 0.73
2000 883 0.48 913 0.53 944 0.57 976 0.62 1009 0.67 1043 0.71 1078 0.76 111
2100 906 0.56 936 0.60 967 0.65 999 0.70 1033 0.75 1067 0.79 1101 0.84 1135 0.88
2200 930 0.64 960 0.68 991 0.73 1024 0.78 1058 0.83 1092 0.88 1126 0.92 1160 0.96
2300 954 0.72 985 0.77 1017 0.82 1051 0.87 1085 0.92 1119 0.96 1152 1.00 1186 1.04
2400 981 0.81 1013 0.86 1046 0.91 1079 0.96 1113 1.00 1146 1.05 1180 1.09 1213 1.13
Air
Volume
cfm
1600 1071 0.58 1109 0.62 1147 0.66 1186 0.69 1225 0.72 1263 0.76 1299 0.80 1334 0.83
1700 1088 0.64 1126 0.68 1164 0.72 1202 0.75 1240 0.78 1276 0.82 1311 0.86 1345 0.90
1800 1107 0.70 1143 0.74 1181 0.78 1219 0.81 1256 0.85 1291 0.89 1324 0.93 1357 0.97
1900 1126 0.77 1163 0.81 1200 0.85 1237 0.88 1273 0.92 1306 0.96 1339 1.00 1371 1.04
2000 1148 0.84 1183 0.88 1220 0.92 1257 0.96 1291 1.00 1323 1.04 1354 1.08 1385 1.12
2100 1170 0.92 1206 0.96 1242 1.00 1277 1.04 1310 1.08 1340 1.13 1371 1.17 1401 1.21
2200 1195 1.00 1230 1.04 1265 1.08 1299 1.13 1330 1.18 1359 1.23 1388 1.27 1418 1.31
2300 1220 1.08 1254 1.13 1288 1.17 1320 1.23 1350 1.28 1378 1.34 1406 1.38 1435 1.42
2400 1245 1.18 1278 1.22 1311 1.28 1341 1.33 1370 1.40 1397 1.45 1425 1.50 1454 1.54
0.10 0.20 0.30 0.40 0.50 0.60 0.70 0.80
RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP
Field Furnished Kit A03
0.90 1.00 1.10 1.20 1.30 1.40 1.50 1.60
RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP
Kit A03 Kit A07
0.10 0.20 0.30 0.40 0.50 0.60 0.70 0.80
RPM BHP RPM BHP RPM BHP RPM
Field Furnished Kit A03
0.90 1.00 1.10 1.20 1.30 1.40 1.50 1.60
RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP
Kit A03 Kit A07
External Static - in. w.g.
External Static - in. w.g.
External Static - in. w.g.
BHP RPM BHP RPM BHP RPM BHP RPM BHP
2 0.80
External Static - in. w.g.
Page 11
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 eld installed accessories air resistance (duct resistance, diffuser, etc.).
See page 13 for blower motors and drives and page 14 for wet coil and options/accessory air resistance data.
External Static - in. w.g.
Air
Volume
cfm
1900 826 0.36 859 0.41 894 0.45 928 0.50 964 0.56 1000 0.61 1036 0.66 1072 0.70
2000 857 0.42 889 0.47 920 0.52 952 0.57 986 0.62 1020 0.68 1055 0.73 1091 0.77
2100 878 0.49 909 0.54 940 0.59 973 0.64 1006 0.70 1041 0.75 1076 0.80 1112 0.85
2200 897 0.55 929 0.61 961 0.66 994 0.72 1028 0.78 1063 0.83 1099 0.89 1134 0.93
2300 918 0.62 950 0.68 983 0.74 1017 0.80 1052 0.86 1087 0.92 1122 0.97 1157 1.02
2400 941 0.70 974 0.77 1008 0.83 1042 0.90 1077 0.96 1111 1.01 1146 1.06 1181 1.11
2500 966 0.79 1000 0.86 1034 0.93 1068 1.00 1103 1.06 1137 1.11 1171 1.16 1205 1.20
2600 994 0.90 1028 0.97 1062 1.04 1096 1.10 1130 1.16 1164 1.21 1197 1.26 1231 1.30
2700 1023 1.01 1057 1.08 1091 1.15 1125 1.22 1159 1.27 1192 1.32 1225 1.37 1258 1.41
2800 1053 1.13 1088 1.21 1122 1.27 1155 1.33 1188 1.39 1221 1.43 1253 1.48 1286 1.53
2900 1085 1.26 1119 1.33 1153 1.40 1186 1.45 1218 1.51 1250 1.55 1281 1.61 1313 1.66
Air
Volume
cfm
1900 1109 0.75 1146 0.79 1183 0.82 1221 0.86 1260 0.90 1294 0.94 1323 0.98 1349 1.02
2000 1128 0.82 1164 0.86 1201 0.89 1239 0.93 1276 0.97 1310 1.01 1336 1.06 1362 1.10
2100 1148 0.89 1185 0.93 1221 0.97 1258 1.01 1294 1.05 1325 1.09 1351 1.14 1376 1.19
2200 1170 0.97 1206 1.01 1242 1.05 1277 1.09 1311 1.14 1341 1.18 1365 1.23 1390 1.28
2300 1193 1.06 1228 1.09 1262 1.14 1295 1.19 1327 1.24 1355 1.29 1380 1.33 1406 1.37
2400 1216 1.15 1250 1.19 1282 1.24 1313 1.30 1343 1.36 1371 1.40 1396 1.44 1423 1.48
2500 1240 1.24 1273 1.29 1302 1.36 1331 1.42 1360 1.48 1388 1.52 1414 1.55 1441 1.58
2600 1265 1.34 1296 1.40 1324 1.47 1352 1.54 1381 1.60 1408 1.64 1434 1.67 1460 1.70
2700 1291 1.46 1321 1.52
2800 1317 1.58 1346 1.66 1372 1.74 1399 1.80 1426 1.85 1451 1.89 1477 1.92 1503 1.95
2900 1343 1.72 1371 1.80 1397 1.88 1424 1.95 1450 1.99 1475 2.02 1500 2.05 1526 2.08
0.10 0.20 0.30 0.40 0.50 0.60 0.70 0.80
RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP
Field Furnished Kit A04
External Static - in. w.g.
0.90 1.00 1.10 1.20 1.30 1.40 1.50 1.60
RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP
Kit A04 Kit A08
1347 1.60 1374 1.67 1403 1.72 1429 1.76 1455 1.79 1481 1.82
Page 12
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 eld installed accessories air resistance (duct resistance, diffuser, etc.).
See page 13 for blower motors and drives and page 14 for wet coil and options/accessory air resistance data.
External Static - in. w.g.
Air
Volume
cfm
1900 853 0.41 886 0.46 919 0.50 952 0.55 986 0.60 1021 0.64 1056 0.69 1091 0.73
2000 883 0.48 913 0.53 944 0.57 976 0.62 1009 0.67 1043 0.71 1078 0.76 1112 0.80
2100 906 0.56 936 0.60 967 0.65 999 0.70 1033 0.75 1067 0.79 1101 0.84 1135 0.88
2200 930 0.64 960 0.68 991 0.73 1024 0.78 1058 0.83 1092 0.88 1126 0.92 1160 0.96
2300 954 0.72 985 0.77 1017 0.82 1051 0.87 1085 0.92 1119 0.96 1152 1.00 1186 1.04
2400 981 0.81 1013 0.86 1046 0.91 1079 0.96 1113 1.00 1146 1.05 1180 1.09 1213 1.13
2500 1010 0.91 1042 0.96 1075 1.00 1109 1.05 1142 1.09 1175 1.14 1207 1.18 1239 1.23
2600 1040 1.01 1073 1.05 1106 1.10 1139 1.14 1171 1.19 1203 1.23 1235 1.28 1266 1.33
2700 1072 1.10 1104 1.15 1137 1.20 1169 1.24 1201 1.29 1232 1.34 1263 1.40 1293 1.46
2800 1105 1.21 1137 1.25 1168 1.30 1200 1.35 1231 1.40 1261 1.46 1291 1.52 1321 1.59
2900 1138 1.32 1169 1.37 1200 1.42 1231 1.47 1261 1.53 1291 1.60 1321 1.66 1350 1.73
Air
Volume
cfm
1900 1126 0.77 1163 0.81 1200 0.85 1237 0.88 1273 0.92 1306 0.96 1339 1.00 1371 1.04
2000 1148 0.84 1183 0.88 1220 0.92 1257 0.96 1291 1.00 1323 1.04 1354 1.08 1385 1.12
2100 1170 0.92 1206 0.96 1242 1.00 1277 1.04 1310 1.08 1340 1.13 1371 1.17 1401 1.21
2200 1195 1.00 1230 1.04 1265 1.08 1299 1.13 1330 1.18 1359 1.23 1388 1.27 1418 1.31
2300 1220 1.08 1254 1.13 1288 1.17 1320 1.23 1350 1.28 1378 1.34 1406 1.38 1435 1.42
2400 1245 1.18 1278 1.22 1311 1.28 1341 1.33 1370 1.40 1397 1.45 1425 1.50 1454 1.54
2500 1271 1.28 1303 1.33 1334 1.39 1363 1.45 1391 1.52 1418 1.57 1446 1.62 1474 1.66
2600 1297 1.39 1328 1.45 1357 1.52 1385 1.58 1412 1.64 1439 1.70 1467 1.74 1495 1.78
2700 1323 1.52 1353 1.58
2800 1351 1.65 1380 1.72 1407 1.78 1434 1.85 1460 1.90 1486 1.95 1513 1.99 1541 2.02
2900 1379 1.79 1407 1.86 1434 1.92 1460 1.98 1485 2.04 151
0.10 0.20 0.30 0.40 0.50 0.60 0.70 0.80
RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP
Field Furnished Kit A04
External Static - in. w.g.
0.90 1.00 1.10 1.20 1.30 1.40 1.50 1.60
RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP
Kit A04 Kit A08
1382 1.65 1409 1.72 1435 1.77 1462 1.82 1490 1.86 1517 1.90
1 2.08 1538 2.12 1565 2.15
BELT DRIVE KIT SPECIFICATIONS
Model No.
Nominal Maximum Nominal Maximum
Blower Motor Choice (HP)
036 1.5 1.72 2 2.3
048 1.5 1.72 2 2.3
060 1.5 1.72 2 2.3
072 1.5 1.72 2 2.3
NOTE - Using total air volume and system static pressure requirements determine from blower performance tables rpm and motor hp required. Maximum usable hp of
motors furnished are shown. In Canada, nominal motor hp is also maximum usable motor hp. If motors of comparable hp are used, be sure to keep within the service
factor limitations outlined on the motor nameplate.
Drive Kit No. RPM Range
A01 673 - 1010 rpm
A05 897 - 1346 rpm
A02 745 - 1117 rpm
A06 1071 - 1429 rpm
A03 833 - 1250 rpm
A07 1212 - 1548 rpm
A04 968 - 1340 rpm
A08 1193 - 1591 rpm
Page 13
Page 14
BLOWER DATA
POWER EXHAUST FANS PERFORMANCE
Return Air System
Static Pressure
in. w.g.
208V 230V, 460V and 575V 208V 230V, 460V and 575V
Low Medium High Low Medium High Low Medium High Low Medium High
0 1290 1300 1320 1300 1305 1295 3545 3915 4230 3880 4135 4340
0.1 1045 1055 1055 1040 1050 1055 2880 3215 3580 3255 3550 3755
0.2 805 805 815 805 810 810 2290 2665 3055 2710 3010 3240
0.3 580 580 600 595 590 585 1735 2175 2605 2200 2500 2770
0.4 390 405 400 405 400 410 1165 1660 2175 1685 2010 2325
0.5 245 315 215 240 255 300 530 1045 1710 1120 1510 1885
0.6 155 340 35 90 165 290 - - - 250 1160 470 990 1420
0.7 145 515 - - - - - - 140 400 - - - - - - 470 - - - 430 915
OPTIONS / ACCESSORIES AIR RESISTANCE - in. w.g.
Air Volume
cfm
Economizer Electric Heat
800 0.04 0.01 0.01 0.01
1000 0.04 0.03 0.02 0.01
1200 0.04 0.06 0.02 0.01
1400 0.04 0.09 0.03 0.02
1600 0.04 0.12 0.04 0.03
1800 0.05 0.15 0.05 0.04
2000 0.05 0.18 0.06 0.05
2200 0.05 0.20 0.08 0.06
2400 0.05 0.22 0.09 0.07
2600 0.06 0.24 0.10 0.08
2800 0.06 0.26 0.11 0.09
3000 0.06 0.28 0.13 0.10
CEILING DIFFUSERS AIR RESISTANCE (in. w.g.)
Air Volume
cfm
RTD9-65 Step–Down Diffuser FD9-65
2 Ends
Open
1 Side &
2 Ends Open
800 0.15 0.13 0.11 0.11 - - - - - - - - - - - 1000 0.19 0.16 0.14 0.14 - - - - - - - - - - - 1200 0.25 0.20 0.17 0.17 - - - - - - - - - - - 1400 0.33 0.26 0.20 0.20 - - - - - - - - - - - 1600 0.43 0.32 0.20 0.24 - - - - - - - - - - - -
1800 0.56 0.40 0.30 0.30 0.13 0.11 0.09 0.09
2000 0.73 0.50 0.36 0.36 0.15 0.13 0.11 0.10
2200 0.95 0.63 0.44 0.44 0.18 0.15 0.12 0.12
2400 - - - - - - - - - - - - - 0.21 0.18 0.15 0.14
2600 - - - - - - - - - - - - - 0.24 0.21 0.18 0.17
2800 - - - - - - - - - - - - - 0.27 0.24 0.21 0.20
3000 - - - - - - - - - - - - - 0.32 0.29 0.25 0.25
CEILING DIFFUSER AIR THROW DATA
Air Volume - cfm 1 Effective Throw - ft.
Model No. RTD9-65 FD9-65
800 10 - 17 14 - 18
1000 10 - 17 15 - 20
1200 11 - 18 16 - 22
1400 12 - 19 17 - 24
1600 12 - 20 18 - 25
1800 13 - 21 20 - 28
2000 14 - 23 21 - 29
2200 16 - 25 22 - 30
Model No. RTD11-95 FD11-95
2600 24 - 29 19 - 24
2800 25 - 30 20 - 28
3000 27 - 33 21 - 29
1
Effective throw based on terminal velocities of 75 ft. per minute.
T1PWRE10A T1PWRE10N
All Ends &
Sides Open
Air Volume Exhausted - cfm
036-048 060-072
RTD11-95 Step-Down Diffuser FD11-95
Flush
Diffuser
2 Ends
Open
2 Ends Open
Page 14
Wet Indoor Coil
1 Side &
All Ends &
Sides Open
Flush
Diffuser
Page 15
ELECTRICAL DATA 2 - 2.5 TON
DIRECT DRIVE BLOWER
1
Voltage - 60hz 208/230V - 1 Ph 208/230V - 1 Ph
Compressor 1 Rated Load Amps 13.5 14.1
Locked Rotor Amps 58.3 73
Outdoor Fan
Full Load Amps (total) 1.7 1.7
Motors (1)
Service Outlet 115V GFI 15 Amps 15 Amps
Indoor Blower
Motor
2
Maximum
Horsepower .25 .25
Full Load Amps 1.8 1.8
Unit Only 30 35
Overcurrent
Protection
3
Minimum
Unit Only 21 22
Circuit
Ampacity
ELECTRIC HEAT DATA
Electric Heat Voltage 208 240 208 240
2
Maximum
Overcurrent
Protection
3
Minimum
Circuit
Ampacity
Unit +
Electric Heat
Unit +
Electric Heat
7.5 kW 60 60 60 70
10 kW 70 80 70 80
7.5 kW 55 60 55 61
10 kW 66 73 67 74
ELECTRICAL ACCESSORIES
Disconnect
Kit
Fuse Block 28W69 28W69 17W94 17W94
1
Extremes of operating range are plus and minus 10% of line voltage.
2
HACR type breaker or fuse.
3
Refer to National or Canadian Electrical Code manual to determine wire, fuse and disconnect size requirements.
Standard Access - 0-10 kW 20W15 20W15 20W15 20W15
Hinged Access - 0-10 kW 20W21 20W21 20W21 20W21
KHA024S KHA030S
Page 15
Page 16
ELECTRICAL DATA 3 TON
KHA036S
1
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 5.8 3.8
Locked Rotor Amps 79 73 38 36.5
Outdoor Fan
Motors (1)
Power
Exhaust
(1) 0.75 HP
Service Outlet 115V GFI 15 Amps 15 Amps 15 Amps 15 Amps
Indoor
Blower
Motor
2
Maximum
Overcurrent
Protection
3
Minimum
Circuit
Ampacity
ELECTRIC HEAT DATA
2
Maximum
Overcurrent
Protection
3
Minimum
Circuit
Ampacity
2
Maximum
Overcurrent
Protection
3
Minimum
Circuit
Ampacity
ELECTRICAL ACCESSORIES
Disconnect
Kit
Fuse Block Unit Only 17W95 17W97 18W00 18W01 18W01 18W06 18W06
1
Extremes of operating range are plus and minus 10% of line voltage.
2
HACR type breaker or fuse.
3
Refer to National or Canadian Electrical Code manual to determine wire, fuse and disconnect size requirements.
Full Load Amps (total) 1.7 1.7 1.1 0.7
Full Load Amps (total) 5 5 2.2 1.5
Horsepower .5 1.5 .5 1.5 2 .5 1.5 2 .5 1.5 2
Full Load Amps 3.9 11 3.9 6.6 7.5 2 3 3.4 2 2.4 2.7
Unit Only 40 50 25 30 30 15 15 15 15 15 15
with (1) 0.75 HP
45 50 30 35 35 15 15 15 15 15 15
Power Exhaust
Unit Only 27 34 19 22 23 11 12 12 8 8 9
with (1) 0.75 HP
32 39 24 27 28 13 14 14 9 10 10
Power Exhaust
Electric Heat Voltage 208 240 208 240 208 240 208 240 208 240 480 480 480 600 600 600
Unit +
Electric Heat
Unit +
Electric Heat
Unit +
Electric Heat
and (1) 0.75 HP
7.5 kW 70 70 70 80 40 45 45 45 45 50 25 25 25 20 20 20
15 kW 100 110 110 125 60 70 70 70 70 70 35 35 35 30 30 30
7.5 kW 61 66 68 73 39 42 41 44 42 45 22 23 24 17 17 18
15 kW 95 105 102 11 2 58 64 61 67 62 68 33 34 35 26 26 27
7.5 kW 70 80 80 80 45 50 50 50 50 50 25 25 30 20 20 20
15 kW 100 110 110 125 70 70 70 80 70 80 40 40 40 30 30 30
Power Exhaust
Unit +
Electric Heat
and (1) 0.75 HP
7.5 kW 66 71 73 78 44 47 46 49 47 50 24 25 26 18 19 19
15 kW 100 110 107 117 63 69 66 72 67 73 36 37 37 27 28 28
Power Exhaust
Standard Access - 0-7.5 kW 20W15 20W15 20W15 20W15 20W15 20W15 20W15
15 kW 20W16 20W16 20W15 20W15 20W15 20W15 20W15
Hinged Access - 0-7.5 kW 20W21 20W21 20W21 20W21 20W21 20W21 20W21
15 kW 20W22 20W22 20W21 20W21 20W21 20W21 20W21
Unit + Power Exhaust 17W96 17W97 18W01 18W02 18W02 18W06 18W06
Page 16
Page 17
ELECTRICAL DATA 4 TON
KHA048S
1
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 6.2 4.8
Locked Rotor Amps 117 83.1 41 33
Outdoor Fan
Motors (1)
Power
Exhaust
(1) 0.75 HP
Service Outlet 115V GFI 15 Amps 15 Amps 15 Amps 15 Amps
Indoor
Blower
Motor
2
Maximum
Overcurrent
Protection
3
Minimum
Circuit
Ampacity
ELECTRIC HEAT DATA
Electric Heat Voltage 208 240 208 240 208 240 208 240 208 240 480 480 480 600 600 600
2
Maximum
Overcurrent
Protection
3
Minimum
Circuit
Ampacity
2
Maximum
Overcurrent
Protection
3
Minimum
Circuit
Ampacity
ELECTRICAL ACCESSORIES
Disconnect
Kit
Fuse Block Unit Only 17W97 17W98 18W02 18W02 18W03 18W06 18W06
1
Extremes of operating range are plus and minus 10% of line voltage.
2
HACR type breaker or fuse.
3
Refer to National or Canadian Electrical Code manual to determine wire, fuse and disconnect size requirements.
Full Load Amps (total) 1.7 1.7 1.1 0.7
Full Load Amps (total) 5 5 2.2 1.5
Horsepower .5 1.5 .5 1.5 2 .5 1.5 2 .5 1.5 2
Full Load Amps 3.9 11 3.9 6.6 7.5 2 3 3.4 2 2.4 2.7
Unit Only 50 60 35 35 40 15 15 15 15 15 15
with (1) 0.75 HP
50 60 40 40 45 15 20 20 15 15 15
Power Exhaust
Unit Only 33 40 23 26 27 11 12 13 9 10 10
with (1) 0.75 HP
38 45 28 31 32 14 15 15 11 11 11
Power Exhaust
Unit +
Electric Heat
Unit +
Electric Heat
Unit +
Electric Heat
and (1) 0.75 HP
7.5 kW 80 80 80 90 50 50 50 50 50 50 25 25 25 20 20 20
15 kW 11 0 125 110 125 70 70 70 80 70 80 35 35 35 30 30 30
7.5 kW 67 72 74 80 43 46 45 48 46 49 23 24 24 18 19 19
15 kW 101 111 108 119 62 68 65 71 66 72 34 35 35 27 28 28
7.5 kW 80 90 90 90 50 60 50 60 60 60 25 30 30 20 20 20
15 kW 11 0 125 125 125 70 80 70 80 80 80 40 40 40 30 30 30
Power Exhaust
Unit +
Electric Heat
and (1) 0.75 HP
7.5 kW 72 77 79 85 48 51 50 53 51 54 25 26 26 20 20 20
15 kW 106 116 113 124 67 73 70 76 71 77 36 37 38 29 29 29
Power Exhaust
Standard Access - 0-7.5 kW 20W15 20W16 20W15 20W15 20W15 20W15 20W15
15 kW 20W16 20W16 20W15 20W15 20W15 20W15 20W15
Hinged Access - 0-7.5 kW 20W21 20W22 20W21 20W21 20W21 20W21 20W21
15 kW 20W22 20W22 20W21 20W21 20W21 20W21 20W21
Unit + Power Exhaust 17W97 17W98 18W03 18W03 18W04 18W06 (.5 hp)
18W06
18W07 (1.5-2 hp)
Page 17
Page 18
ELECTRICAL/ELECTRIC HEAT DATA 5 TON
KHA060S
1
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 7.8 5.8
Locked Rotor Amps 134 11 0 52 38.9
Outdoor Fan
Motors (1)
Power
Exhaust
(1) 0.75 HP
Service Outlet 115V GFI 15 Amps 15 Amps 15 Amps 15 Amps
Indoor Blower
Motor
2
Maximum
Overcurrent
Protection
3
Minimum
Circuit
Ampacity
ELECTRIC HEAT DATA
Electric Heat Voltage 208 240 208 240 208 240 480 480 600 600
2
Maximum
Overcurrent
Protection
3
Minimum
Circuit
Ampacity
2
Maximum
Overcurrent
Protection
3
Minimum
Circuit
Ampacity
ELECTRICAL ACCESSORIES
Disconnect
Kit
Fuse Block Unit Only 17W99 18W03 18W04 18W07 18W06
1
Extremes of operating range are plus and minus 10% of line voltage.
2
HACR type breaker or fuse.
3
Refer to National or Canadian Electrical Code manual to determine wire, fuse and disconnect size requirements.
Full Load Amps (total) 2.4 2.4 1.3 1
Full Load Amps (total) 5 5 2.2 1.5
Horsepower 1.5 1.5 2 1.5 2 1.5 2
Full Load Amps 11 6.6 7.5 3 3.4 2.4 2.7
Unit Only 70 40 45 20 20 15 15
with (1) 0.75 HP
70 45 45 20 20 15 15
Power Exhaust
Unit Only 47 29 30 15 15 11 11
with (1) 0.75 HP
52 34 35 17 17 13 13
Power Exhaust
Unit +
Electric Heat
7.5 kW 90 100 50 60 60 60 30 30 20 20
15 kW 125 125 70 80 70 80 40 40 30 30
22.5 kW 150 175 90 100 90 100 50 50 40 40
Unit +
Electric Heat
7.5 kW 81 86 51 51 52 52 26 26 20 20
15 kW 11 4 125 68 74 69 75 37 38 29 29
22.5 kW 148 164 88 97 89 98 48 49 38 39
Unit +
Electric Heat
and (1) 0.75 HP
Power Exhaust
Unit +
Electric Heat
and (1) 0.75 HP
Power Exhaust
7.5 kW 100 100 60 60 60 60 30 30 25 25
15 kW 125 150 80 80 80 80 40 40 35 35
22.5 kW 175 175 100 110 100 110 60 60 40 40
7.5 kW 86 91 54 57 54 57 28 28 22 22
15 kW 11 9 130 73 79 74 80 39 40 31 31
22.5 kW 153 169 93 102 94 103 51 51 40 40
Standard Access - 0-15 kW 20W19 20W18 20W18 20W18 20W18
22.5 kW - - - 20W19 20W19 20W18 20W18
Hinged Access - 0-15 kW 20W25 20W24 20W24 20W24 20W24
22.5 kW - - - 20W25 20W25 20W24 20W24
Unit + Power Exhaust 17W99 18W04 18W05 18W07 18W06
Page 18
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 19 9.7 7.4
Locked Rotor Amps 123 62 50
Outdoor Fan
Motor
Power Exhaust
(1) 0.75 HP
Service Outlet 115V GFI 15 Amps 15 Amps 15 Amps
Indoor Blower
Motor
2
Maximum
Overcurrent
Protection
3
Minimum
Circuit
Ampacity
ELECTRIC HEAT DATA
Electric Heat Voltage 208 240 208 240 480 480 600 600
2
Maximum
Overcurrent
Electric Heat
Protection
3
Minimum
Circuit
Electric Heat
Ampacity
2
Maximum
Overcurrent
Protection
Electric Heat
and (1) 0.75 HP
Power Exhaust
3
Minimum
Circuit
Ampacity
Electric Heat
and (1) 0.75 HP
Power Exhaust
ELECTRICAL ACCESSORIES
Disconnect
Kit
1
Extremes of operating range are plus and minus 10% of line voltage.
2
HACR type breaker or fuse.
3
Refer to National or Canadian Electrical Code manual to determine wire, fuse and disconnect size requirements.
Standard Access - 0-22.5 kW 20W18 20W18 20W18 20W18
Hinged Access - 0-22.5 kW 20W24 20W24 20W24 20W24
Full Load Amps 3 1.5 1.2
Full Load Amps 5 2.2 1.5
Horsepower 1.5 2 1.5 2 1.5 2
Full Load Amps 6.6 7.5 3 3.4 2.4 2.7
Unit Only 50 50 25 25 20 20
With (1) 0.75 HP
Power Exhaust
50
50
25
25
20
Unit Only 34 35 17 18 13 14
With (1) 0.75 HP
39 40 19 20 15 15
Power Exhaust
Unit+
7.5 kW 60 70 60 70 35 35 25 25
15 kW 80 80 80 80 40 40 35 35
22.5 kW 100 110 100 110 60 60 40 45
30 kW 125 125 125 125 70 70 50 50
Unit+
7.5 kW 53 56 54 57 28 29 22 23
15 kW 73 79 74 80 40 40 31 32
22.5 kW 92 102 93 102 51 51 40 41
30 kW 11 2 124 113 125 62 63 49 50
Unit+
7.5 kW 70 70 70 70 35 35 25 25
15 kW 80 90 80 90 45 45 35 35
22.5 kW 100 110 100 110 60 60 45 45
30 kW 125 150 125 150 70 70 60 60
Unit+
7.5 kW 58 61 59 62 31 31 24 24
15 kW 78 84 79 85 42 42 33 33
22.5 kW 97 107 98 107 53 54 42 42
30 kW 11 7 129 118 130 64 65 51 51
30 kW 20W19 20W19 20W18 20W18
30 kW 20W25 20W25 20W24 20W24
20
Page 19
Page 20
ELECTRIC HEAT CAPACITIES
Input
Voltage
208 1 5.6 19,200 1 7.5 25,600 1 11.2 38,200 2 16.9 57,700 1 22.5 76,800
220 1 6.3 21,500 1 8.4 28,700 1 12.6 43,000 2 18.9 64,500 1 25.2 86,000
230 1 6.9 23,500 1 9.2 31,400 1 13.8 47,000 2 20.7 70,700 1 27.5 93,900
240 1 7.5 25,600 1 10.0 34,200 1 15.0 51,200 2 22.5 76,800 1 30.0 102,400
440 1 6.3 21,500 - - - - - - - - - 1 12.6 43,000 2 18.9 64,500 1 25.2 86,000
460 1 6.9 23,500 - - - - - - - - - 1 13.8 47,000 2 20.7 70,700 1 27.5 93,900
480 1 7.5 25,600 - - - - - - - - - 1 15.0 51,200 2 22.5 76,800 1 30.0 102,400
550 1 6.3 21,500 - - - - - - - - - 1 12.6 43,000 2 18.9 64,500 1 25.2 86,000
575 1 6.9 23,500 - - - - - - - - - 1 13.8 47,000 2 20.7 70,700 1 27.5 93,900
600 1 7.5 25,600 - - - - - - - - - 1 15.0 51,200 2 22.5 76,800 1 30.0 102,400
No of
Stages
7.5 kW 10 kW 15 kW 22.5 kW 30 kW
kW
input
Btuh
Output
No of
Stages
kW
input
Btuh
Output
No of
Stages
kW
input
Btuh
Output
No of
Stages
kW
input
Btuh
Output
No of
Stages
kW
input
Btuh
Output
Page 20
Page 21
KHA PARTS ARRANGEMENT
FILTERS
024, 030, 036, 048, :16 X 20 X 2"
060S, : 20 X 20 X 2"
INDOOR TXV
ECONOMIZER
(OPTIONAL)
CONDENSATE
DRAIN
INDOOR COIL
ELECTRIC HEAT
(OPTIONAL)
BLOWER
MOTOR
BLOWER
REVERSING
VALV E
DEFROST CONTROL
BOARD (CMC1)
TB1 LOW VOLTAGE
TERMINAL BLOCK
OUTDOOR FAN
OUTDOOR
TXV
OUTDOOR
COIL
COMPRESSOR
CMC1
TERMINAL BLOCK TB1
KHA CONTROL BOX
TRANSFER RELAY
K8
FAN RELAY
K10
LOW AMBIENT RELAY
K58
FIGURE 1
BLOWER CONTACTOR
K3
CONTACTOR
K1
TRANSFORMER T4
OR
OVERLOAD RELAY S42
TRANSFORMER
T1
T1
CAPACITOR C1
or C12
FIGURE 2
Page 21
Page 22
I−UNIT COMPONENTS
The KHA unit parts arrangement are shown in figure 1. All
L1, L2 and L3 wiring is color coded; L1 is red, L2 is yellow
and L3 is blue. See wiring diagrams in the back of this manual for complete call out of components.
A−Control Box Components
KHA control box components are shown in figure 2. The
control box is located in the upper portion of the compressor compartment.
1−Terminal Strip TB1
All indoor thermostat connections will be to TB1 located in
the control box.
2−Transformer T1
All KHA series units use a single line voltage to 24VAC
transformer mounted in the control box. Transformer
supplies power to control circuits in the unit. The transformer is rated at 70VA and is protected by a 3.5 amp circuit breaker (CB8). The 208/230 (Y) voltage transform-
208/230V TRANSFORMER
PINK GRAY
SECONDARY
208 VOLTS
230 VOLTS
ORANGE GRAY
PRIMARY
FIGURE 3
ers use two primary
voltage taps as shown
in figure 3, while 460
(G) and 575 (J) voltage
transformers use a
single primary voltage
tap.
3−Outdoor Fan Capacitor C1 (Y, G, J & M)
Fan capacitors C1 is used to assist in the start up of condenser fan motor B4. Capacitor ratings will be on outdoor fan
motor nameplate.
4−Dual Capacitor C12 (Single Phase)
A single dual capacitor is used for both the outdoor fan and
compressor (see unit diagram). The fan side and the compressor side have different MFD ratings. See side of capacitor for
ratings,.
5−Compressor Contactor K1
K1 is a 24V line voltage contactor used to energize the
compressor and in some cases (P and Y voltage) condenser fan in response to thermostat demand. Single
phase units use single−pole double break contactors
and three phase units use three−pole double break contactors.
6−Low Ambient Kit Relay K58
(option used with S11 low ambient switch)
Low ambient relay K58 is a N.C.DPDT relay with a 24V
coil wired in parallel with reversing valve L1. When L1 is
energized in the cooling cycle, K58 is also energized
opening K58−1. Therefore, K58−1 is always closed during heating demand bypassing S11. This allows the fan
to operate during the heating demand and cycle during
the cooling demand.
7−Blower Contactor K3
Blower contactor K3 is used in all units. K3 has a 24V coil used
to energize the indoor blower motor in response to blower demand. In single phase units K3 is a single−pole contactor and in
three phase units K3 is a two−pole contactor.
8−Transfer Relay K8
K8 is a two−pole relay with a 24V coil used to de−energize the
reversing valve during a heat call. On a first stage heat call
K8−1 closes de−energizing the reversing valve and K8−2 closes
energizing Y1 on the CMC1 board. Without K8 the reversing
valve would remain energized at all times.
9−Outdoor Fan Relay K10 G, J & M Voltage
Outdoor fan relay K10 is a DPDT relay switch with a 24VAC
coil. K10 energizes condenser fan motor B4 in response to a
heating or cooling demand.
10−Transformer T4 (J voltage)
All (J) 575 voltage units use transformer T4 mounted in the
control box. T4 is a line voltage to 460V to power the indoor
blower. It is connected to line voltage and is powered at all
times.
Page 22
Page 23
11−Defrost Control CMC1
The KHA defrost system includes two components: a defrost thermostat and a defrost control.
Defrost Thermostat (Defrost Switch S6)
The defrost thermostat is located on the liquid line between
the outdoor check/expansion valve and the distributor.
When defrost thermostat senses 42°F (5.5°C) or cooler,
the thermostat contacts close and send a signal to the defrost control board to start the defrost timing. It also terminates defrost when the liquid line warms up to 70°F (21°C).
Defrost Control
The defrost control board includes the combined functions
of a time/temperature defrost control, defrost relay and
diagnostic LEDs.
The control provides automatic switching from normal
heating operation to defrost mode and back. During compressor cycle (call for defrost), the control accumulates
compressor run times at 30-, 60-, or 90-minute field−adjustable intervals. If the defrost thermostat is closed when the
selected compressor run time interval ends, the defrost
relay is energized and defrost begins.
Defrost Control Board
FIELD SELECT
TIMING PINS
TEST
PINS
DIAGNOSTIC
COMPRESSOR
DELAY PINS
REVERSING
VALV E
S49
FREEZESTAT
DEFROST
THERMOSTAT
S4
HIGH PRESSURE
SWITCH
FIGURE 4
Defrost Control Timing Pins
Each timing pin selection provides a different accumulated compressor run time period. This time period must
occur before a defrost cycle is initiated. The defrost interval can be adjusted to 30, 60 or 90 minutes (see figure 4).
The defrost timing jumper is factory−installed to provide a
60−minute defrost interval. If the timing selector jumper is
not in place, the control defaults to a 90−minute defrost
interval. The maximum defrost period is 14 minutes and
cannot be adjusted.
A TEST option is provided for troubleshooting. The TEST
mode may be started any time the unit is in the heating
mode and the defrost thermostat is closed or jumpered. If the jumper is in the TEST position at power-up, the
control will ignore the test pins. When the jumper is placed
across the TEST pins for two seconds, the control will enter
the defrost mode. If the jumper is removed before an additional 5−second period has elapsed (7 seconds total), the
unit will remain in defrost mode until the defrost thermostat
opens or 14 minutes have passed. If the jumper is not re-
LEDS
24V TERMINAL
STRIP
CONNECTIONS
moved until after the additional 5−second period has
elapsed, the defrost will terminate and the test option will
not function again until the jumper is removed and re−applied.
Compressor Delay
The defrost board has a field−selectable function to reduce
occasional sounds that may occur while the unit is cycling
in and out of the defrost mode. The compressor will be
cycled off for 30 seconds going in and out of the defrost
mode when the compressor delay jumper is removed.
NOTE − The 30-second compressor feature is ignored
when the defrost test pins are jumpered.
Time Delay
The timed-off delay is five minutes long. The delay helps to
protect the compressor from short-cycling in case the power to the unit is interrupted (demand met for example) or a
pressure switch opens. The delay is bypassed by placing
the timer select jumper across the TEST pins for 0.5 seconds.
Pressure Switch Circuit
The defrost control incorporates two pressure switch circuits. An optional high pressure switch (S4) is connected to
the board’s HI PS terminals (see figure 4). The board also
includes terminals LO PS for a freezestat (S49) or low pressure switch (S87). Switches are shown in the unit wiring
diagram. During a single demand cycle, the defrost control
will lock out the unit after the fifth time that the circuit is interrupted by any switch wired to the control board. In addition,
the diagnostic LEDs will indicate a locked-out switch after
the fifth occurrence of an open pressure switch (see Table
1). The unit will remain locked out until power to the board is
interrupted, then re-established or until the jumper is applied to the TEST pins for 0.5 seconds.
NOTE − The defrost control board ignores input from the LO
PS terminals as follows:
during the TEST mode,
during the defrost cycle,
during the 90-second start-up period,
and for the first 90 seconds each time the reversing valve
switches heat/cool modes.
Diagnostic LEDs
The defrost board uses two LEDs for diagnostics. The LEDs
flash a specific sequence according to the condition.
TABLE 1
Defrost Control Board Diagnostic LED
Mode Green LED (DS2) Red LED (DS1)
No power to control
Normal operation /
power to control
Anti-short cycle
lockout
Low pressure
switch, freezestat
fault
Low pressure
switch, freezestat
lockout
High pressure
switch fault
High pressure
switch lockout
OFF OFF
Simultaneous Slow FLASH
Alternating Slow FLASH
OFF Slow FLASH
OFF ON
Slow FLASH OFF
ON OFF
Page 23
Page 24
EVAPORATOR COIL
RETURN
AIR SECTION
KHA PLUMBING and S49 FREEZESTAT LOCATION
CONTROL SECTION
INDOOR EXPANSION VALVE
REVERSING
VALV E
INDOOR BLOWER SECTION
PROCESS TUBE
used for charging
OUTDOOR
EXPANSION
VALV E
DRIER
ELECTRIC HEAT SECTION
COMPRESSOR
KHA−060 KHA−024, 030, 036, 048
S49
FIGURE 5
Page 24
Page 25
B−Cooling Components
If Interlink compressor replacement is necessary, call
1−800−4−LENNOX (1−800−453−6669).
If the freezestat is tripping frequently due to coil icing, check the
airflow, filters and unit charge before allowing unit back in operation. Make sure to eliminate conditions which might promote indoor coil ice buildup.
IMPORTANT
Some scroll compressors have an internal vacuum
protector that will unload scrolls when suction
pressure goes below 20 psig. A hissing sound will
be heard when the compressor is running unloaded. Protector will reset when low pressure in
system rises above 40 psig. DO NOT REPLACE
COMPRESSOR.
KHA units use one cooling circuit consisting of a compressor, outdoor coil and indoor coil. See figure 5. Units are
equipped with one draw−through type condenser fan. All
units are equipped with indoor blowers which draw air
across the indoor coil during unit operation. KHA units have
three condensate drain locations: front, back and bottom of
unit. See unit installation instructions for more detail.
Cooling may be supplemented by a factory or fieldinstalled economizer. The indoor coil is slab type. The indoor coil uses a thermostatic check/expansion valve as the
primary expansion device. The indoor coil is also equipped
with enhanced fins and rifled tubing. In all units the compressor
is protected by a freezestat (S49) (on the indoor coil) and a
high pressure switch (S4). A low ambient switch (S84) is
available as an option for additional compressor protection.
1−Compressor B1
All KHA024/060 units use scroll compressor. See SPECIFICATIONS" and ELECTRICAL DATA" (table of contents)
or compressor nameplate for compressor specifications.
3−High Pressure Switch S4
The high pressure switch is an auto reset SPST N.C. switch
which opens on a pressure rise. The switch is located in the
compressor discharge line and is wired to HI PS" on the
CMC1 board.
When discharge pressure rises to 640 ± 10 psig (4413 ±
69 kPa) (indicating a problem in the system) the switch
opens and the CMC1 board de−energizes the compressor (the economizer can continue to operate). S4 will
close when pressure drops back to 475 psig (3275 kPA).
4−Low Ambient Switch S11 (option)
The low ambient switch is an auto-reset SPST N.O. pressure switch which allows for mechanical cooling operation at low outdoor temperatures. In all models a switch
is located in the liquid line prior to the indoor coil section.
In the P and Y voltage units S11 is wired in series with the K1
contactor and the CMC1 board fan contacts. In G, J and M voltage units S11 in series with outdoor fan relay K10 and low ambient relay K58 (if used).
When liquid pressure rises to 450 ± 10 psig (3102 ± 69
kPa), the switch closes and the condenser fan is energized. When discharge pressure in drops to 240 ± 10 psig
(1655 ± 69 kPa), the switch opens and the condenser fan in
that refrigerant circuit is de−energized. This intermittent fan
operation results in higher evaporating temperature allowing the system to operate without icing the indoor coil and
losing capacity.
WARNING
Electrical shock hazard. Compressor must be
grounded. Do not operate without protective cover
over terminals. Disconnect power before removing
protective cover. Discharge capacitors before servic-
ing unit. Failure to follow these precautions could
cause electrical shock resulting in injury or death.
The compressor is energized by a corresponding compressor contactor.
NOTE−Refer to the wiring diagram section for specific unit
operation.
2−Freezestat S49
Each unit is equipped with a low temperature switch (freezestat) located on the return bend of the indoor coil.
The freezestat is wired to LO PS" on the CMC1 board and is
a SPST N.C. auto−reset switch which opens at 29F + 3F
(-1.7C + 1.7C) on a temperature dr op and clos es at 58F
+ 4F (14.4C + 2.2C) on a temperature rise. To prevent
coil icing, the freezestat opens during compressor operation to temporarily disable the compressor until the
coil warms sufficiently to melt any accumulated frost.
5−Reversing Valve L1
A refrigerant reversing valve with a 24 volt solenoid coil
is used to reverse refrigerant flow during unit operation
in all KHA un its . The rev ersi ng valve is connected in the vapor line of the refrigerant circuit. Th e r ever sing valve co il is
energized during cooling demand and during defrost.
Reversing valve L1 is controlled by the CMC1 board and
transfer relay K8 in response to cooling demand or by defrost.
6−Condenser Fan Motor B4
See specifications section of this manual for specifications of
condenser fan B4. B4 is energized by contactor K1 in P and Y
voltage units and K10 in G and J units. All motors are ball
bearing type single−phase motors. The fans may be removed
for servicing and cleaning by removing the fan grilles.
7−Low Temperature Switch S3 (option)
(compressor monitor)
S3 is a SPST bimetal thermostat which opens on temperature drop. It is wired in line with the indoor thermostat and
transfer relay K8. In the cooling mode, when outdoor temperature drops below 40° F (4.5° C) the switch opens and
Page 25
Page 26
de−energizes the compressor. When the compressor is de−
energized the cooling demand is handled by the economizer. The switch automatically resets when outdoor temperature rises to 50° F (10° C).
8−Filter Drier (all units)
KHA units have a filter drier located in the liquid line of the refrigerant circuit at the exit of the condenser coil (outdoor coil
in KHA units). The drier removes contaminants and moisture
from the system. Replacement must be suitable for R−410A
refrigerant.
9−Crankcase Heater HR1 & Thermostat S40
All units have a crankcase heater. HR1 prevents migration
of liquid refrigeration into the compressor and ensures
proper compressor lubrication.
S40 is a N.C. thermostat located on the discharge line
which opens when discharge line temperature rises above
94°F (34°C). When S40 opens the crankcase heater is de−
energized. The thermostat closes when discharge line
temperature drops below 74°F (23°C) energizing the
crankcase heater.
C−Blower Compartment
KHA036 and 048 units are equipped with either direct drive
or belt drive blowers. KHA024S and 030S units are
equipped with direct drive blowers only and KHA060S units
are available with belt drive blowers only. See unit nameplate for blower type. The blower compartment in all
KHA036/060 units is located between the evaporator coil and
the compressor compartment.
1−Blower Wheels
All belt drive units use 10" x 10" (254 mm x 254 mm) blower
wheels. The KHA024, 030, 036 and 048 direct drive units use
10" x 10" (254 mm x 254 mm) blower wheels also.
2−Indoor Blower Motor Capacitor C4
All single phase blower motors are PSC and requires a run
capacitor. Ratings may vary from each motor. See motor
nameplate for capacitor ratings.
3−Indoor Blower Motor B3
All direct drive units use single phase PSC motors. Belt
drive units use single or three phase motors (same as supply voltage). CFM adjustments on belt drive units are made
by adjusting the motor pulley (sheave). CFM adjustments
on direct drive units are made by changing speed taps. Belt
drive motors are equipped with sealed ball bearings. Direct
drive motors are equipped with sleeve bearings. Units may
be equipped with motors manufactured by various
manufacturers, therefore electrical FLA and LRA specifications will vary. See unit rating plate for information specific
to your unit.
OPERATION / ADJUSTMENT
IMPORTANT
Three phase scroll compressors must be phased sequentially for correct compressor and blower rotation. Follow COOLING START−UP" section of installation instructions to ensure proper compressor and
blower operation.
A−Blower Operation
Initiate blower demand at thermostat according to instructions provided with thermostat. Unit will cycle on thermostat
demand. The following steps apply to applications using a
typical electro−mechanical thermostat.
1− Blower operation is manually set at the thermostat sub-
base fan switch. With fan switch in ON position, blow-
ers will operate continuously.
2− With fan switch in AUTO position, the blowers will cycle
with demand. Blowers and entire unit will be off when
system switch is in OFF position.
B−Determining Unit CFM − Direct Drive Blowers
1− The following measurements must be made with air fil-
ters in place and no cooling demand.
2− With all access panels in place, measure static pres-
sure external to unit (from supply to return). Add any
additional air resistance for options and accessories
shown in air resistance table on Page 13.
3− Use figure 6 to determine the factory set blower speed.
BLOWER SPEED FACTORY SETTINGS
036 Units
1
Com
2
Hi
3
Med
4
Low*
*Factory Setting
FIGURE 6
4− Use the blower tables starting on Page 7, mea-
sured static pressure and the factory−set blower
speed to determine CFM. If CFM is lower than the design specified CFM, move the lead from speed tap 3
or 4 to speed tap 2. See figure 7.
Note − Speed tap 3 can be used on 036 units if speed tap 2
delivers more CFM than required by design specification.
For 460/575V units, remove the isolation lead from speed
tap 2 before moving the wire to speed tap 2. Tape the exposed end of the isolation lead and secure away from other
components. See figure 7.
024, 030,
048 Units
1
2
3
4
Com
Hi
Med*
Low
Page 26
Page 27
DIRECT DRIVE HIGH STATIC APPLICATIONS
MOVE CONNECTOR TO
TERMINAL 2 FOR HIGH
TERMINAL 1
REMAINS AT
COMMON
SPEED
TAPS
460/575V UNITS:
Disconnect isolation lead before
moving speed tap wire. Tape exposed
end of isolation lead and secure away
from other components.
STATIC APPLICATIONS
BLOWER
MOTOR
1
2
3
4
BLOWER
SHAFT
FIGURE 7
C−Determining Unit CFM − Belt Drive Blowers
1− The following measurements must be made with air fil-
ters in place and no cooling demand.
2− With all access panels in place, measure static pres-
sure external to unit (from supply to return).
3− Measure the indoor blower wheel RPM.
4− Referring to the blower tables starting on Page 7 use
static pressure and RPM readings to determine unit
CFM. Use air resistance table on Page 13 when instal-
ling units with any of the options or accessories listed.
5− The blower RPM can be adjusted at the motor pulley.
Loosen Allen screw and turn adjustable pulley clock-
wise to increase CFM. Turn counterclockwise to de-
crease CFM. See figure 8. Do not exceed minimum and
maximum number of pulley turns as shown in table 2.
TABLE 2
MINIMUM AND MAXIMUM PULLEY ADJUSTMENT
Belt Min. Turns Open Max. Turns Open
A Section No minimum 5
D−Blower Belt Adjustment
Maximum life and wear can be obtained from belts only if
proper pulley alignment and belt tension are maintained. Tension new belts after a 24−48 hour period of
1
2
3
4
operation. This will allow belt to stretch and seat
grooves. Make sure blower and motor pulley are aligned as
shown in figure 9.
1− Loosen four bolts securing motor base to mounting
frame. See figure 8.
2− To increase belt tension −
Slide blower motor downward to tighten the belt. This
increases the distance between the blower motor and
the blower housing.
3− To loosen belt tension −
Slide blower motor upward to loosen the belt. This de-
creases the distance between the blower motor and
the blower housing.
4− Tighten four bolts securing motor base to the mounting
frame.
Page 27
Page 28
TO INCREASE CFM
LOOSEN ALLEN SCREW &
TURN PULLEY CLOCKWISE
BLOWER ASSEMBLY
TO DECREASE CFM
TURN PULLEY
COUNTERCLOCKWISE
SIDE VIEW
MOTOR
TO INCREASE BELT TENSION
1−Loosen four bolts securing motor base to mounting
frame.
2−Slide the motor downward to tighten the belt.
3−Tighten four bolts on motor base.
ALLEN
SCREW
PULLEY
FIGURE 8
PULLEY ALIGNMENT
ALIGNED
MOTOR
PULLEY
BELT
NOT ALIGNED
BLOWER
PULLEY
FIGURE 9
E−Check Belt Tension
Overtensioning belts shortens belt and bearing life. Check
belt tension as follows:
1− Measure span length X. See figure 10.
2− Apply perpendicular force to center of span (X) with
enough pressure to deflect belt 1/64" for every inch of
span length or 1.5mm per 100mm of span length.
LOOSEN ALLEN
SCREW TO
ADJUST CFM
LOOSEN FOUR BOLTS AND
SLIDE BLOWER MOTOR
DOWNWARD TO TIGHTEN BELT
Example: Deflection distance of a 40" span would be
40/64" or 5/8".
Example: Deflection distance of a 400mm span would
be 6mm.
3− Measure belt deflection force. For a used belt, the
deflection force should be 5 lbs. (35kPa). A new belt
deflection force should be 7 lbs. (48kPa).
A force below these values indicates an undertensioned belt. A force above these values indicates an
overtensioned belt.
F−Field−Furnished Blower Drives
See blower data tables for field−furnished blower drives to
determine BHP and RPM required. See drive kit table on to
determine the drive kit number.
MEASURE BELT TENSION
FORCE
DEFLECTION 1/64" PER INCH OF SPAN
OR 1.5mm PER 100mm OF SPAN
FIGURE 10
Page 28
Page 29
D−Optional Electric Heat Components
Electric heat matchups are found in the ELECTRICAL
DATA tables. See table of contents.
All electric heat sections consist of electric heating elements exposed directly to the airstream. See figure 11.
See figure 12 for vestibule parts arrangement.
1−Contactors K15, K16
All contactors are double break and either single,
double or three pole (see diagram) and equipped with
a 24VAC coil. The coils in the K15 and K16 contactors
are energized by the indoor thermostat. In all units
K15 energizes the heating elements, while in the 22.5
kW units, K15 and K16 energize the heating elements
simultaneously.
2−High Temperature Limits S15 (Primary)
S15 is a SPST N.C. auto-reset thermostat located on the
back panel of the electric heat section above the heating
elements. S15 is the high temperature limit for the electric
heat section. When S15 opens, indicating a problem in the
system, contactor K15 is de-energized (including K16 in
22.5 kW units). When K15 is de-energized, all stages of
heat are de-energized. See table 3 for S15 set points. Set
points are factory set and not adjustable.
TABLE 3
5−Terminal Strip TB3
P and Y voltage units are equipped with terminal strip
TB3. Electric heat line voltage connections are made
to TB3, which distributes power to the electric heat
components and is located on the vestibule. See fig-
ure 12.
6−Heating Elements HE1 through HE6
Heating elements are composed of helix wound bare
nichrome wire exposed directly to the airstream. Three
elements are connected in a three-phase arrange-
ment. The elements in 208/230V units are connected
in a Delta" arrangement. Elements in 460 and 575V
units are connected in Wye" arrangement. Each stage
is energized independently by the corresponding contac-
tors located on the electric heat vestibule panel. Once
energized, heat transfer is instantaneous. High temper-
ature protection is provided by primary and redundant
high temperature limits and overcurrent protection is
provided by fuses.
ELECTRIC HEAT ELEMENTS
Unit kW (Voltage) S15 Opens ° F S15 Closes ° F
7.5 (Y, G, J, P) 160 120
10 (P) 170 130
15 (Y) 170 130
15 (G, J, P) 160 120
22.5 (Y, G, J) 160 120
22.5 (P) 150 110
3−High Temperature Limit S20 and S157 (Secondary)
S20 and S157 are SPST N.C. manual-reset thermostats. S20 and S157 are wired in series with the heating
elements. See T1EH wiring diagrams. When either
limit opens K15 and K16 are de-energized. When the
contactors are de-energized, all stages of heat are deenergized. The thermostat is factory set to open at
220_F + 6_F (104_C + 3.3_C) on a temperature rise
and can be manually reset when temperature falls below 160_F (71.0_C). See figure 12 for location.
4−Terminal Strip TB2
Terminal strip TB2 is used for single point power installations only. TB2 distributes power to TB3. Units with
multi−point power connections will not use TB2.
FIGURE 11
7−Fuse F3 and F42
Fuse F3 and F42 are housed in a fuse block which holds
two or three fuses. Each F3 fuse is connected in series
with each leg of electric heat. Figure 12 and table 4 show
the fuses used with each electric heat section.
8−Unit Fuse Block & Fuse F4
Unit fuses F4 provide short circuit and ground fault
protection to all cooling components in the KHA units
with electric heat. The fuses are rated in accordance
with the amperage of the cooling components. The F 4
fuse block is located inside a sheetmetal enclosure.
Page 29
Page 30
TABLE 4
Unit
T1EH0075
T1EH0010 208/230V−1P 30 A−250V 30A−250V 2 2
T1EH0015
T1EH00225
T1EH0300
Voltage−
Phase
208/230V−1P 40 A−250V −−−−− 2 2
208/230V−3P 25 A−250V −−−−− 3 3
460V−3P 15 A−600V −−−−− 3 3
575V−3P 15 A−600V −−−−− 3 3
208/230V−1P 40 A−250V 40A−250V 2 4
208/230V−3P 50 A−250V −−−−− 3 3
460V 25 A−600V −−−−− 3 3
575V 20 A−600V −−−−− 3 3
208/230V−1P 40 A−250V 40A−250V 3 6
208/230V−3P 45 A−250V 45A−250V 3 6
460V−3P 35 A−600V −−−−− 3 3
575V−3P 30 A−600V −−−−− 3 3
208/230V−3P 60 A−250V 60A−250V 3 6
460V−3P 50 A−600V −−−−− 3 3
575V−3P 40 A−600V −−−−− 3 3
FUSE Qty Qty
F3 F42 each total
Primary Limit
S15
Pilot Relay
K9
Contactors
K15 & K16
ELECTRIC HEAT VESTIBULE
Heating Element Bank
HE1 − HE6
Secondary Limit
S20 & S157
Fuse
F42
Fuse
F3
Terminal Strip
TB3
FIGURE 12
Page 30
Page 31
II−PLACEMENT AND INSTALLATION
Make sure the unit is installed in accordance with the
installation instructions and all applicable codes. See
accessories section for conditions requiring use of the
optional roof mounting frame (T1CURB).
III−START UP − OPERATION
Refer to startup directions and refer closely to the unit wiring diagram when servicing. See unit nameplate for minimum circuit ampacity and maximum fuse size.
A−Preliminary and Seasonal Checks
1− Make sure the unit is installed in accordance with the
installation instructions and applicable codes.
2− Inspect all electrical wiring, both field and factory installed
for loose connections. Tighten as required. Refer to unit
diagram located on inside of unit control box cover.
3− Check to ensure that refrigerant lines are in good
condition and do not rub against the cabinet or other
refrigerant lines.
4− Check voltage at the disconnect switch. Voltage must
be within the range listed on the nameplate. If not,
consult the power company and have the voltage corrected before starting the unit.
5− Recheck voltage and amp draw with unit running. If
voltage is not within range listed on unit nameplate,
stop unit and consult power company. Refer to unit
nameplate for maximum rated load amps.
6− Inspect and adjust blower belt (see section on Blower
Compartment − Blower Belt Adjustment).
B−Heating Start Up
1− Set thermostat or temperature control device to initiate
a first−stage heating demand.
A first−stage heating demand (W1) will energize compressor 1 and the outdoor fan.
Note − L1 reversing valve is de−energized in the heating
mode.
KHA Units With Optional Electric Heat −
An increased heating demand (W2) will energize electric heat. Electric heat is also energized during the defrost cycle to maintain discharge air temperature.
C−Cooling Start Up
IMPORTANT
If unit is equipped with a crankcase heater. Make sure
heater is energized 24 hours before unit start−up to
prevent compressor damage as a result of slugging.
1− Set thermostat or temperature control device fan
switch to AUTO or ON. Set thermostat or temperature
control device to initiate a first−stage cooling demand.
A Y1 cooling demand will energize L1 reversing valve
and the compressor.
Units With Optional Economizer −
The optional economizer will start on a Y1 cooling de-
mand when outdoor air enthalpy is suitable.
2− Refrigerant circuits are factory charged with R−410A
refrigerant. See unit rating plate for correct amount of
charge.
Three Phase Scroll Compressor Voltage Phasing
Three phase scroll compressors must be phased sequentially to ensure correct compressor and blower rotation and operation. Compressor and blower are wired in
phase at the factory. Power wires are color−coded as follows: line 1−red, line 2−yellow, line 3−blue.
1− Observe suction and discharge pressures and blower
rotation on unit start−up.
2− Suction pressure must drop, discharge pressure must
rise and blower rotation must match rotation marking.
If pressure differential is not observed or blower rotation is
not correct:
3− Disconnect all remote electrical power supplies.
4− Reverse any two field−installed wires connected to the
line side of K1 contactor. Do not reverse wires at blower contactor.
Make sure the connections are tight.
Discharge and suction pressures should operate at their
normal start-up ranges.
Page 31
Page 32
IV− SYSTEMS SERVICE CHECKS
Refrigerant Charge and Check
WARNING−Do not exceed nameplate charge under any condition.
This unit is factory charged and should require no further
adjustment. If the system requires charge, reclaim the
charge, evacuate the system and add required nameplate charge.
NOTE − System charging is not recommended below 60_F
(15_C). In temperatures below 60_F (15_C) , the charge
must be weighed into the system.
If weighing facilities are not available, or to check the
charge, use the following procedure:
1− Attach gauge manifolds and operate unit in cooling
mode until system stabilizes (approximately five minutes).
2− Check each system separately with all stages operat-
ing.
3− Use a thermometer to accurately measure the outdoor
ambient temperature.
4− Apply the outdoor temperature to tables 5 through 9 to
determine normal operating pressures.
5− Compare the normal operating pressures to the pres-
sures obtained from the gauges. Minor variations in
these pressures may be expected due to differences
in installations. Significant differences could mean that
the system is not properly charged or that a problem
exists with some component in the system. Correct
any system problems before proceeding.
6− If discharge pressure is high, remove refrigerant from
the system. If discharge pressure is low, reclaim the
charge, evacuate the system then add refrigerant.
D Add or remove charge in increments.
D Allow the system to stabilize each time refriger-
ant is added or removed.
7− Use the following approach method along with the nor-
mal operating pressures to confirm readings.
TABLE 5
KHA024S NORMAL OPERATING PRESSURES
Outdoor Coil
Entering Air Temp
65_F
75_F
85_F
95_F
105_F
115_F
Dis. + 10 psig Suct. +5 psig
226 147
258 148
304 151
351 154
402 157
460 160
TABLE 6
KHA030S NORMAL OPERATING PRESSURES
Outdoor Coil
Entering Air Temp
65_F
75_F
85_F
95_F
105_F
115_F
Dis. + 10 psig Suct. +5 psig
235 145
273 148
316 151
363 153
416 156
476 158
TABLE 7
KHA036S NORMAL OPERATING PRESSURES
Outdoor Coil
Entering Air
Temp
65_F
75_F
85_F
95_F
105_F
115_F
Dis. + 10 psig Suct. +5 psig
247 140
289 143
331 145
381 148
434 151
492 154
TABLE 8
KHA048S NORMAL OPERATING PRESSURES
Outdoor Coil
Entering Air
Temp
65_F
75_F
85_F
95_F
105_F
115_F
Dis. + 10 psig Suct. +5 psig
272 139
313 142
359 145
410 148
465 150
529 152
TABLE 9
KHA060S NORMAL OPERATING PRESSURES
Outdoor Coil
Entering Air
Temp
65_F
75_F
85_F
95_F
105_F
115_F
Dis. + 10 psig Suct. +5 psig
265 136
304 139
348 141
397 144
447 147
507 149
Page 32
Page 33
C−Charge Verification − Approach Method
8− Using the same thermometer, compare liquid tempera-
ture to outdoor ambient temperature.
Approach Temperature = Liquid temperature minus
ambient temperature.
9− Approach temperature should match values in table
10. An approach temperature greater than value
shown indicates an undercharge. An approach temperature less than value shown indicates an overcharge.
A−Lubrication
All motors are lubricated at the factory. No further lubrication is required.
B−Filters
Units are equipped with temporary filters which need to be
replaced before the building is occupied. See table 11 for
correct filter size. Refer to local codes or appropriate jurisdiction for approved filters.
Approved filters should be checked monthly and replaced
when necessary. Take note of air flow direction marking on
filter frame when reinstalling filters. See figure 13.
10− Do not use the approach method if system pressures
do not match pressures in tables 5 through 9. The approach method is not valid for grossly over or undercharged systems.
TABLE 10
APPROACH TEMPERATURE
Unit
Liquid Temp. Minus Ambient
024S 7°F + 1 (3.9°C + 0.5)
030S, 036S 9°F + 1 (5.0°C + 0.5)
048S, 060S 11 °F + 1 (6.1°C + 0.5)
Temp.
V−MAINTENANCE
The unit should be inspected once a year by a qualified service technician.
WARNING
Product contains fiberglass wool.
Disturbing the insulation in this product during
installation, maintenance, or repair will expose you
to fiberglass wool. Breathing this may cause lung
cancer. (Fiberglass wool is known to the State of California to cause cancer.)
Fiberglass wool may also cause respiratory, skin and
eye irritation.
To reduce exposure to this substance or for further
information, consult material safety data sheets
available from address shown on unit nameplate or
contact your supervisor.
CAUTION
Label all wires prior to disconnection when servicing
controls. Wiring errors can cause improper and dangerous operation. Verify proper operation after servicing.
WARNING
Units are shipped from the factory with temporary filters. Replace filters before building is occupied.
Damage to unit could result if filters are not replaced
with approved filters. Refer to appropriate codes.
TABLE 11
UNIT FILTERS
Unit Qty Filter Size − inches (mm)
024, 030, 036, 048, 4 16 X 20 X 2 (406 X 508 X 51)
060 4 20 X 20 X 2 (508 X 508 X 51)
NOTE−Filters must be U.L.C. certified or equivalent for use
in Canada.
C−Supply Air Blower Wheel
Annually inspect supply air blower wheel for accumulated
dirt or dust. Turn off power before attempting to remove access panel or to clean blower wheel.
D−Indoor Coil
Inspect and clean coil at beginning of each cooling and
heating season. Clean using mild detergent or commercial
coil cleanser. Flush coil and condensate drain with water
taking care not to get insulation, filters and return air ducts
wet.
E−Outdoor Coil
Clean outdoor coil annually with detergent or commercial
coil cleaner and inspect monthly during the cooling season.
Outdoor coils are made of single and two formed slabs. On
units with two slabs, dirt and debris may become trapped
between the slabs. To clean between slabs, carefully separate coil slabs and wash them thoroughly. See figure 14.
Flush coils with water following cleaning.
Note − Remove all screws and gaskets prior to cleaning
procedure and replace upon completion.
F−Filter Drier
The unit is equipped with a biflow filter drier. if replacement
is necessary, order another of like design.
Page 33
Page 34
REMOVE FILTERS
FIGURE 13
ENDPLATE IS SECURED
TOP VIEW
SUPPLY
AIR
PULL TO
REMOVE
FILTERS
CLEAN OUTDOOR COIL
TO MULLION
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.
4− Rinse thoroughly with water and reassemble.
BLOWER
OUTDOOR
COILS
FIGURE 14
Page 34
Page 35
VI−ACCESSORIES
The accessories section describes the application of most of
the optional accessories which can be factory or field installed
to the KHA units.
A−T1CURB
When installing the KHA units on a combustible surface for
downflow discharge applications, the Lennox T1CURB 8
inch, 14-inch, 18 inch or 24-inch height roof mounting frame
is used. The roof mounting frames are recommended in all
other applications but not required. If the units are not
mounted on a flat (roof) surface, they MUST be supported
under all edges and under the middle of the unit to prevent
sagging. The units MUST be mounted level within 1/16" per
linear foot or 5mm per meter in any direction.
The assembled mounting frame is shown in figure 15. Refer to the roof mounting frame installation instructions for
details of proper assembly and mounting. The roof mounting frame MUST be squared to the roof and level before
mounting. Plenum system MUST be installed before the
unit is set on the mounting frame. Typical roof curbing and
flashing is shown in figure 16. Refer to the roof mounting
frame installation instructions for proper plenum construction and attachment.
ASSEMBLED ROOF MOUNTING FRAME
UNIT BASE
BOTTOM
UNIT BASE
RAIL
FIBERGLASS
INSULATION
(Furnished)
COUNTER FLASHING
NAILER STRIP
(Furnished)
RIGID INSULATION
(Field Supplied)
ROOF
MOUNTING FRAME
(Extends around entire
perimeter of unit)
(Field Supplied)
CANT STRIP
(Field Supplied)
ROOFING
MATERIAL
FIGURE 16
B−Transitions
Optional supply/return transitions T1TRAN10AN1 is
available for use with the KHA 2, 2.5, 3, 4 and 5 units utilizing optional T1CURB roof mounting frames. Transition must be installed in the mounting frame before
mounting the unit to the frame. Refer to the manufacturer’s
instructions included with the transition for detailed installation procedures.
TYPICAL FLASHING DETAIL
FIGURE 15
C−Outdoor Air Dampers
T1DAMP11A−1 is available for KHA024, 030 036, 048 units
and T1DAMP11N−1 is available for the KHA060S. Both
sets include the outdoor air hood. A motorized kit
(T1DAMP21AN1) can be ordered separately for all KHA
unit sizes. The dampers may be manually or motor (M) operated to allow up to 25 percent outside air into the system
at all times (see figure 17). Washable filter supplied with
the outdoor air dampers can be cleaned with water and a
mild detergent. It should be sprayed with Filter Handicoater when dry prior to reinstallation. Filter Handicoater is R.P.
Products coating no. 418 and is available as Lennox Part
No. P−8−5069.
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OUTDOOR AIR DAMPER
MOTORIZED
DAMPER ASSEMBLY
B7
DAMPER
MOTOR
MANUAL OUTDOOR AIR
DAMPER − PAINTED SIDE
ECONOMIZER CONTROLS
ENTHALPY
SENSOR (OTHER
SIDE OF PANEL)
A6
ENTHALPY
CONTROL
B7
DAMPER
MOTOR
MIXED AIR SENSOR
(R1) AND WIRING IN
THIS BUNDLE
A7
POWER EXHAUST WIRES
ONLY CONNECTED WHEN
UNIT IS EQUIPPED WITH
POWER EXHAUST
FIGURE 18
FIGURE 17
D−Supply and Return Diffusers (all units)
Optional flush mount diffuser/return FD9−65 and extended mount diffuser/return RTD9−65 available for use
with all KHA units. Refer to manufacturer’s instructions
included with transition for detailed installation procedures.
E−Economizer
(Field or Factory Installed)
Unit may contain an optional field or factory−installed economizer equipped with an A6 enthalpy control and an A7
outdoor enthalpy sensor. The modulating economizer
opens fully to use outdoor air for free cooling when temperature is suitable and opens to minimum position during the
occupied time period.
The A6 enthalpy control is located in the economizer access area. See figure 18. The A7 enthalpy sensor is located
on the division panel between horizontal supply and return
air sections.
Optional Sensors
An optional differential sensor (A62) may be used with the
A7 outdoor sensor to compare outdoor air enthalpy to return air enthalpy. When the outdoor air enthalpy is below
the return air temperature, outdoor air is used for free cooling.
Mixed air sensor (R1) is used to modulate dampers to 55°F
(13°C) discharge air.
An optional IAQ sensor (A63) may be used to lower operating costs by controlling outdoor air based on CO2 level or
room occupancy (also called demand control ventilation or
DCV). Damper minimum position can be set lower than
traditional minimum air requirements; dampers open to
traditional ventilation requirements when CO2 level reaches DCV (IAQ) setpoint.
Refer to instructions provided with sensors for installation.
A6 Enthalpy Control LED’s
A steady green Free Cool LED indicates that outdoor air is
suitable for free cooling.
When an optional IAQ sensor is installed, a steady green
DCV LED indicates that the IAQ reading is higher than setpoint requiring more fresh air. See figure 19.
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Page 37
A6 ENTHALPY CONTROLLER
EXH
Set
2V 10V
EXH
DAMPER MINI-
MUM POSITION
1− Set thermostat to occupied mode if the feature is avail-
able. Make sure jumper is in place between TB1 termi-
nals R and OC if using a thermostat which does not
have the feature.
2− Rotate MIN POS SET potentiometer to approximate
desired fresh air percentage.
Min
Pos
Open
DCV
Max
2V 10V
DCV
DCV
Set
2V 10V
Free
Cool
C
B
A
D
FREE COOLING SETPOINT;
A=Completely counterclockwise
D=Completely clockwise
IAQ MAXIMUM
POSITION
(set higher than
minimum position)
IAQ READING IS
ABOVE SETPOINT
IAQ SETPOINT
OUTDOOR AIR
SUITABLE LED
FIGURE 19
Free Cooling Setpoint
Outdoor air is considered suitable when temperature and
humidity are less than the free cooling setpoints shown in
table 12. Setting A is recommended. See figure 19. At setting A, free cooling will be energized when outdoor air is
approximately 73°F (23°C) and 50% relative humidity. If indoor air is too warm or humid, lower the setpoint to B. At setting B, free cooling will be energized at 70°F (21°C) and
50% relative humidity.
When an optional A62 differential sensor is installed, turn
A6 enthalpy control free cooling setpoint potentiometer
completely clockwise to position D".
TABLE 12
ENTHALPY CONTROL SETPOINTS
Control Setting Free Cooling Setpoint At 50% RH
A
B
C
D
73° F (23° C)
70° F (21° C)
67° F (19° C)
63° F (17° C)
Damper Minimum Position
NOTE − A jumper must be installed between TB1 R and
OC terminals to maintain occupied status (allowing minimum fresh air). When using an electronic thermostat or
energy management system with an occupied/unoccupied feature, remove jumper.
Note − Damper minimum position can be set lower than
traditional minimum air requirements when an IAQ sensor
is specified. Dampers will open to DCV MAX setting (if CO2
is above setpoint) to meet traditional ventilation requirements.
3− Measure outdoor air temperature. Mark the point on
the bottom line of chart 1 and label the point A" (40_F,
4_C shown).
4− Measure return air temperature. Mark that point on the
top line of chart 1 and label the point B" (74_F, 2 3 _C
shown).
5− Measure mixed air (outdoor and return air) tempera-
ture. Mark that point on the top line of chart 1 and label
point C" (70_F, 21_C shown).
6− Draw a straight line between points A and B.
7− Draw a vertical line through point C.
8− Draw a horizontal line where the two lines meet. Read
the percent of fresh air intake on the side.
9− If fresh air percentage is less than desired, adjust MIN
POS SET potentiometer higher. If fresh air percentage
is more than desired, adjust MIN POS SET potentiom-
eter lower. Repeat steps 3 through 8 until calculation
reads desired fresh air percentage.
DCV Set and Max Settings
Adjust settings when an optional IAQ sensor is installed.
The DCV SET potentiometer is factory−set at approximately 50% of the potentiometer range. Using a standard
1−2000ppm CO2 sensor, dampers will start to open when
the IAQ sensor reads approximately 1000ppm. Adjust
the DCV SET potentiometer to the approximate setting
specified by the controls contractor. Refer to figure 19.
The DCV MAX potentiometer is factory−set at approximately 50% of the potentiometer range or 6VDC. Dampers will open approximately half way when CO2 rises
above setpoint. Adjust the DCV MAX potentiometer to
the approximate setting specified by the controls contractor. Refer to figure 19.
Note − DCV Max must be set higher than economizer minimum position setting for proper demand control ventilation.
Page 37
Page 38
_F
_C
10
CHART 1
CALCULATE MINIMUM FRESH AIR PERCENTAGE
MIXED AND RETURN AIR TEMPERATURE
−20
−10
−29
−230−1810−1220−730−140450106016702180279032
0
100
_F
38
_C
BC
0
10
20
30
40
50
60
70
80
90
100
_F
_C
−20
−10
−29
−230−1810−1220−730−140450106016702180279032
OUTDOOR AIR TEMPERATURE
A
Economizer Operation
The occupied time period is determined by the thermostat
or energy management system.
Outdoor Air Not Suitable:
During the unoccupied time period dampers are closed.
20
30
40
50
60
70
80
90
100
100
_F
38
_C
B−Outdoor Air Dampers
Optional manual and motorized outdoor air dampers provide fresh outdoor air. The motorized damper assembly
opens to minimum position during the occupied time period and remains closed during the unoccupied period.
Manual damper assembly is set at installation and remains in that position.
During the occupied time period a cooling demand will
open dampers to minimum position and mechanical cooling functions normally.
During the occupied time period dampers will open to DCV
MAX when IAQ reading is above setpoint (regardless of
thermostat demand or outdoor air suitability).
Outdoor Air Suitable:
See table 13 for economizer operation with a standard two−
stage thermostat.
During the occupied period, dampers will open to DCV
MAX when IAQ reading is above setpoint (regardless of
thermostat demand or outdoor air suitability). DCV MAX
will NOT override damper full−open position. When an R1
mixed air sensor for modulating dampers is installed, DCV
MAX may override damper free cooling position when occupancy is high and outdoor air temperatures are low. If R1
senses discharge air temperature below 45_F (7_C),
dampers will move to minimum position until discharge air
temperature rises to 48_F (9_C).
Set damper minimum position in the same manner as
economizer minimum position. Adjust motorized damper
position using the thumbwheel on the damper motor. See
figure 20. Manual damper fresh air intake percentage can
be determined in the same manner.
DAMPER MOTOR
THUMBWHEEL
FIGURE 20
Page 38
Page 39
TABLE 13
ECONOMIZER OPERATION
OUTDOOR AIR IS SUITABLE FOR FREE COOLING −− FREE COOL LED ON"
THERMOSTAT DEMAND
OFF
G
Y1
Y2
UNOCCUPIED
CLOSED
CLOSED
OPEN*
OPEN*
DAMPER POSITION
OCCUPIED
CLOSED
MINIMUM
OPEN*
OPEN*
MECHANICAL COOLING
*Dampers will modulate to maintain 55_F (13_C) supply air when an R1 mixed air sensor is installed.
NO
NO
NO
STAGE 1
POWER EXHAUST FAN
CONNECT P18 TO J18
BEFORE SECURING
EXHAUST FAN IN
PLACE
P18
J18 JACK ON
UNDERSIDE OF
DIVISION PANEL
FIGURE 21
F−Power Exhaust Relay K65 (PED units)
Power exhaust relay K65 is a N.O. DPDT relay with a
24VAC coil. K65 is used in all KHA units equipped with
the optional power exhaust dampers. K65 is energized
by the economizer control panel (A6), after the economizer dampers reach 50% open (adjustable on control
A6). When K65 closes, the exhaust fan B10 is energized.
G−Power Exhaust Fans
T1PWRE10A available for KHA036, 048 units and
T1PWRE10N available for 060 units, provide exhaust air
pressure relief and also run when return air dampers are
closed and supply air blowers are operating. See figure 21
and installation instructions for more detail.
H−Dirty Filter Switch S27
The dirty filter switch senses static pressure increase indicating a dirty filter condition. The switch is N.O. and closes
at 1" W.C. (248.6 Pa) The switch is mounted in the filter section on the left unit mullion.
I−Indoor Air Quality (CO2) Sensor A63
The indoor air quality sensor monitors CO2 levels and reports the levels to the economizer enthalpy control A6.
Controller A6 adjusts the economizer dampers according
to the CO2 levels. The sensor is mounted next to the indoor thermostat or in the return air duct. Refer to the indoor air quality sensor installation instructions for proper
adjustment.
J−Drain Pan Overflow Switch S149 (optional)
The overflow switch is used to interrupt cooling operation when excessive condensate collects in the drain
pan. The N.O. overflow switch is controlled by K220 and
DL46 relays, located in the unit control panel. When the
overflow switch closes, 24VAC power is interrupted and
after a five−second delay unit compressors are de−energized. Once the condensate level drops below the set
level, the switch will open. After a five−minute delay the
compressor will be energized.
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VII− WIRING DIAGRAMS / SEQUENCE OF OPERATION
KHA024, 036, 048, 060 P Voltage
9
8
5
5
9
1
2
4
8
4
9
5
3
6
10
11
7
Page 40
Page 41
KHA036, 048, 060 Y Voltage
2
4
8
9
5
8
4
9
5
1
9
5
3
6
10
11
7
Page 41
Page 42
KHA036, 048, 060 G, J Voltage
7
11
4
2
8
5
9
5
9
1
9
5
4
3
6
10
7
11
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SEQUENCE OF OPERATION KHA024/060
Power:
1. Line voltage from unit disconnect energizes transformer T1. T1 provides 24VAC power to terminal strip TB1
found in the control box. TB1 provides 24VAC to the
unit cooling, heating and blower controls.
Blower Operation:
2. Indoor thermostat terminal G" energizes contactor K3.
K3 closes, energizing blower B3.
Economizer Operation:
3. The EXH (power exhaust set point) found on the face of
A6, is factory set at approximate 50% of the dial range.
Economizer control module A6 receives a demand and
opens outside dampers 50%. Power exhaust fan relay
K65 is energized 30 seconds after dampers are 50%
open. K65−1 and K65−2 close, energizing power exhaust fan B10.
Cooling Demand
Cooling demand energizes Y1 and G in the thermostat. G
energizes blower (see step 2.)
4. Indoor thermostat COOLING mode energizes reversing
valve L1.
5. CMC1 proves N.C. freezestat S49 and optional N.C. high
pressure switch S4 to energize compressor contactor K1.
6. K1 closes energizing compressor B1.
7. P and Y Voltage
Line voltage is routed through optional N.O. low ambient
pressure switch S11 and optional low ambient kit K58 to
energize outdoor fan B4.
G, J and M Voltage
24VAC passes through optional N.O. low pressure switch
S11 and optional low ambient kit K58 to energize outdoor
fan relay K10. N.O. contacts K10−1 close energizing outdoor fan B4 .
First Stage Heat
NOTE: On heating demand after unit has been in cooling mode, indoor thermostat in HEATING mode will de−
energize reversing valve L1.
8. Heating demand energizes W1 in the thermostat. Relay
K8 is energized. N.C. K8−1 opens, de−energizing reversing valve L1.
9. CMC1 proves N.C.high pressure switches S4 and N.C.
freezestats S49 . Compressor contactor K1 is energized.
10. K1 closes energizing compressor B1.
11. P and Y Voltage
Line voltage from CMC1 is routed through optional N.C.
low ambient switch S11 to energize outdoor fan B4.
G, J and M Voltage
24VAC passes through optional N.O. low pressure switch
and optional low ambient switch K58 to energize outdoor
fan relay K10. K10−1 closes energizing outdoor fan B4.
Second Stage Heat (electric heat):
12. Second stage heat demand energizes W2 in the thermostat.
See sequence of operation for electric heat.
Defrost Mode:
DEFROST MODE:
13. When a defrost cycle is initiated, the control energizes the reversing valve solenoid and turns off the
condenser fan. The control will also put 24VAC on
the W1" (auxiliary heat) line. The unit will stay in this
mode until either the defrost thermostat (S6) temperature is above the termination temperature of
70°, the defrost time of 14 minutes has been completed, or the room thermostat demand cycle has
been satisfied. If the room thermostat demand cycle
terminates the cycle, the defrost cycle will be held
until the next room thermostat demand cycle. If the
defrost thermostat (S6) temperature is still below
the termination temperature, the control will continue the defrost cycle until the cycle is terminated in
one of the methods mentioned above.
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ELECTRONIC OR ELECTROMECHANICAL THERMOSTAT
POWER:
1. Terminal strip TB1 found in the main control box supplies thermostat components with 24VAC.
OPERATION:
2. 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
Page 45
ECONOMIZER
POWER:
1. Terminal strip TB1 found in the main control box energizes the economizer components with 24VAC.
OPERATION:
2. Enthalpy sensor A7 and A62 (if differential enthalpy is used) communicates to the economizer control
module A6 when to power the damper motor B7.
3. Economizer control module A6 supplies B7 with 0 − 10 VDC to control the positioning of economizer.
4. The damper actuator provides 2 to 10 VDC position feedback.
SEQUENCE OF OPERATION
Page 45
Page 46
T1EH−7.5, 10, 15, 22.5 kW P VOLTAGE
3
6
1
5
2
4
7
4
7
4
7
4
7
Page 46
Page 47
T1EHA−7.5, 15, 22.5kW Y VOLTAGE
KHA SERIES UNITS
2
5
3
6
1
4
7
4
7
Page 47
Page 48
T1EHA−7.5, 15, 22.5kW G, J VOLTAGE
KHA SERIES UNITS
5
2
3
6
1
4
7
7
4
Page 48
Page 49
Sequence of Operation −T1EH 7.5, 10, 15, 22.5kW − P Voltage
HEATING ELEMENTS:
1 − Terminal Strip TB2 is energized when the unit discon-
nect closes. TB2 supplies line voltage to electric heat
elements HE1 and TB3. TB3 supplies line voltage to
HE2 through HE6. Elements are protected by fuses F3
and F42.
FIRST STAGE HEAT:
2 − Heating demand initiates at W1 in thermostat.
3 − 24VAC is routed from the indoor thermostat through
N.C. primary limit S15. Electric heat contactor K15 and
heat relay K9 are energized. K9 energizes blower contactor K3 and economizer.
4 − 7.5kW units − N.O. contacts K15−1 close energizing
HE1.
10kW 15kW units − K15−1 and K15−2 close energizing
HE2 and HE3.
22.5kW units − K15−1, K16−1 and K16−2 close energizing HE4, HE5 and HE6.
Sequence of Operation −T1EH 7.5, 15, 22.5kW − Y, G, J Voltage
HEATING ELEMENTS:
1 − Terminal Strip TB2 is energized when the unit discon-
nect closes. TB2 supplies line voltage to electric heat
elements HE1 and TB3. TB3 supplies line voltage to
HE2 and HE3. Elements are protected by fuses F3 and
or F42.
FIRST STAGE HEAT:
2 − Heating demand initiates at W1 in thermostat.
3 − 24VAC is routed from the indoor thermostat through
N.C. primary limit S15. Electric heat contactor K15 and
heat relay K9 are energized. Heat relay K9 energizes
blower contactor K3 and economizer.
4 − 7.5kW and 15kW units − N.O. contacts K15−1 close en-
ergizing HE1.
22.5kW units − N.O. contacts K15−1 close energizing
HE2 and HE3.
END OF FIRST STAGE HEAT:
5 − Heating demand is satisfied. Terminal W1 in the ther-
mostat is de−energized.
6 − Electric heat contactor K15 is de−energized.
7 − 7.5kW units − N.O. contacts K15−1 open de−energizing
HE1.
15kW units − K15−1 and K15−2 open de−energizing HE2
and HE3.
22.5kW units − K15−1, K16−1 and K16−2 open de−energizing HE4, HE5 and HE6.
END OF FIRST STAGE HEAT:
5 − Heating demand is satisfied. Terminal W1 in the ther-
mostat is de−energized.
6 − Electric heat contactor K15 is de−energized.
7 − 7.5kW and 15kW units − N.O. contacts K15−1 open de−
energizing HE1.
22.5kW units − N.O. contacts K15−1 open de−energizing HE2 and HE3.
Page 49
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