Lennox LHT Series Owner's manual

Page 1
LHT
Service Literature 6.5 / 7.5 / 8.5 /10 / 12.5
100087
LHT HEAT PUMP SERIES
WARNING
To prevent serious injury or death:
1- Lock-out/tag-out before performing maintenance.
2- If system power is required (e.g., smoke detector main
tenance), disable power to blower, remove fan belt
where applicable, and ensure all controllers and ther
mostats are set to the “OFF” position before
performing maintenance.
3- Always keep hands, hair, clothing, jewelry, tools, etc.,
away from moving parts.
WARNING
Improper installation, adjustment, alteration, service
or maintenance can cause property damage, person
al injury or loss of life. Installation and service must
be performed by a licensed professional HVAC in
staller or equivalent, service agency, or the gas sup
plier
The LHT commercial heat pump is available in 6.5, 7.5, 8.5,
10 and 12.5 ton capacities. The refrigerant systems utilize
two compressors, two reversing valves, two accumulators,
and other parts common to a heat pump. Electric heat oper
ates in single or multiple stages depending on the kW input
size. 7.5kW through 60kW heat sections are available for
the LHT heat pump.
LHT078-150 units are equipped with variable-volume, di
rect drive blowers. These units will provide supply air at
lower speeds when cooling demand is low and increase to
higher speeds when cooling demand is high. Refer to Sup
ply Air Start-Up sections.
LHT units are designed to accept any of several different
energy management thermostat control systems with mini
mum field wiring.
Information contained in this manual is intended for use by
qualified service technicians only. All specifications are
subject to change. Procedures outlined in this manual are
presented as a recommendation only and do not super
sede or replace local or state codes.
If the unit must be lifted for service, rig unit by attaching four
cables to the holes located in the unit base rail (two holes at
each corner). Refer to the installation instructions for the
proper rigging technique.
EE
M
CAUTION
As with any mechanical equipment, contact with
sharp sheet metal edges can result in personal in
jury. Take care while handling this equipment and
wear gloves and protective clothing.
WARNING
Electric shock hazard. Can cause injury
or death. Before attempting to perform
any service or maintenance, turn the
electrical power to unit OFF at discon
nect switch(es). Unit may have multiple
power supplies.
Table of Contents
Options / Accessories 2..........................
Specifications 5.................................
Blower Data 7..................................
Electrical \ Electric Heat Data 10...................
I Unit Components 16............................
II Placement and Installation 28....................
III Start Up 28...................................
IV System Service Checks 29.....................
V Maintenance 31................................
VI Accessories 32................................
VII Wiring Diagrams 37...........................

Page 2
OPTIONS / ACCESSORIES
Item Description Catalog
Number
Unit Model No
078 092 102 122 150
COOLING SYSTEM
Condensate Drain Trap PVC 22H54 XXXXX
Copper 76W27 XXXXX
 21Z07 OX OX OX OX OX
BLOWER - SUPPLY AIR
 ® OOOOO
CABINET
 24C86 OX OX OX
24C87 OX OX
  OOOOO
 51W25 XXXXX
 54W96 OX OX OX OX OX
CONTROLS
 21Z10 OX OX OX OX OX
 CPC Einstein Integration  OOOOO
® 54W27 OX OX OX OX OX
Novar®   OOOOO
 53W67 OX OX OX OX OX
 21Z08 OX OX OX OX OX
 11K76 OX OX OX OX OX
 11K80 OX OX OX OX OX
INDOOR AIR QUALITY
Air Filters
®󰀩

 50W61 OX OX OX OX OX
 52W41 OX OX OX OX OX
 21U41 XXXXX
 Y3063 XXXXX
Indoor Air Quality (CO) Sensors
󰀨 77N39 XXXXX
󰀨 23V86 XXXXX
 87N52 XXXXX
 87N54 XXXXX
CO 85L43 XXXXX
77N3990N43 XXXXX
Needlepoint Bipolar Ionization (NPBI)
 22U15 XXXXX
UVC Germicidal Lamps
1® 21A93 XXXXX
  10H20 XXXXX
 10H21 XXXXX
1




X = Field Installed.


OPTIONS / ACCESSORIES
Item Description Catalog
Number
Unit Model No
078 092 102 122 150
ELECTRICAL
   OOOOO
  OOOOO
  OOOOO
  54W56 OX OX OX OX OX
 54W57 OX OX OX OX OX
  OOOOO


 74M70 OX OX OX OX OX
  OOOOO
 67E01 XXXXX
²   OOOOO
 10C89 XXXXX
ELECTRIC HEAT
  23U73 OX OX OX
 23U74 OX OX OX
 23U75 OX OX OX
  23U76 OX OX OX OX OX
 23U77 OX OX OX OX OX
 23U78 OX OX OX OX OX
  23U79 OX OX OX OX OX
 23U80 OX OX OX OX OX
 23U81 OX OX OX OX OX
  23U82 OX OX OX OX OX
 23U83 OX OX OX OX OX
 23U84 OX OX OX OX OX
  23U85 OX OX OX OX
 23U86 OX OX OX OX
 23U87 OX OX OX OX
  23U88 OX OX
 23U89 OX OX
 23U90 OX OX
1


2



X = Field Installed.

Page 4
OPTIONS / ACCESSORIES
Item Description Catalog
Number
Unit Model No
078 092 102 122 150
ECONOMIZER





20U80 OX OX OX OX OX
Horizontal Barometric Relief Dampers
 53K04 XXXXX
Economizer Controls
󰀨 Order 2 21Z09 OX OX OX OX OX
   OOOOO
 21Z09 OX OX OX OX OX
 13J77 XXXXX
 13J76 XXXXX
   OOOOO
OUTDOOR AIR
Outdoor Air Dampers With Outdoor Air Hood
 14G28 OX OX OX OX OX
 14G29 XXXXX
POWER EXHAUST
  53W44 OX OX OX OX OX
 53W45 OX OX OX OX OX
 53W46 OX OX OX OX OX
ROOF CURBS

 11F54 XXXXX
 11F55 XXXXX
 11F56 XXXXX
 11F57 XXXXX
Adjustable Pitch Curb
 54W50 XXXXX
CEILING DIFFUSERS
  13K61 X X
 13K62 XXX
  13K56 X X
 13K57 XXX
  12X65 X X
 12X66 XXX



X = Field Installed.

Page 5
SPECIFICATIONS 6.5 TON | 7.5 TON | 8.5 TON
General Data Nominal Tonnage 6.5 Ton 7.5 Ton 8.5 Ton
󰀩 High High High
Model Number LHT078H4E LHT092H4E LHT102H4E
Blower Type 

®


®


®
Cooling
Performance
   
1   
 2400 2800 2800
  7.4 8.1
1 12.4 12.1 12.1
1   15.5
   


   
   
Heating
Performance
1   
   
  7.0 
1C.O.P.   
1   
 5.2  
1C.O.P. 2.25 2.25 2.25
Electric Heat Options Available  
Compressor Type (number) 

Outdoor Coil    
   
   
 20 20 20
Outdoor
Coil Fans
   
   
   
   
   
   
Indoor
Coil
 12.8 12.8 12.8
   
 444
 14 14 14
 
 

Indoor
Blower
   
   
Filters  
 
Electrical characteristics 

1
Cooling Ratings
High Temperature Heating Ratings
Low Temperature Heating Ratings


SPECIFICATIONS 10 TON | 12.5 TON
General Data Nominal Tonnage 10 Ton 12.5 Ton
󰀩 High High
Model Number LHT122H4E LHT150H4E
Blower Type 

®


®
Cooling
Performance
  
1  
  4200
  12.4
1 12.1 11.0
1 15.5 
  


  
  
Heating
Performance
1  
  4200
  11.0
1C.O.P.  
1  
 8.5 10.2
1C.O.P. 2.25 2.10
Electric Heat Options Available 
Compressor Type (number) 

Outdoor Coil  40.4 40.4
  
  
 20 20
Outdoor
Coil Fans
  
  
  
  
  
  
Indoor
Coil
 12.8 12.8
  
 4 4
 14 14
 
 

Indoor
Blower
  
  
Filters  
 
Electrical characteristics 

1
Cooling Ratings
High Temperature Heating Ratings
Low Temperature Heating Ratings

Page 7
BLOWER DATA
BLOWER TABLE INCLUDES RESISTANCE FOR BASE UNIT ONLY (NO HEAT SECTION) WITH DRY INDOOR COIL AND AIR
FILTERS IN PLACE.



󰀨


Total
Air Volume
cfm
Total Static Pressure - in. w.g.
0.2 0.4 0.6 0.8 1.0 1.2 1.4
RPM Watts RPM Watts RPM Watts RPM Watts RPM Watts RPM Watts RPM Watts
1750        420 1128 508    704
2000  271    410 1117 488   1255 704  804
2250     1111  1184 577 1247     
2500     1180  1245       1008
2750   1182  1248 715      1011  
    718  827   1444 1024    
 1282 711  827    1044 1521     
  821     1544      1700 
   1517 1081 1571 1221     1725 1700  1875
4000           1801  1847 
4250    1458   1784    1877   
4500 1724 1510 1772  1818 1851       2000 
4750 1811       2254    2587  
5000    2144   2028 2480 2071  2114 2805 2158 
5250  2205     2111       
5500 2070 2428 2112           
5750              
Total
Air Volume
cfm
Total Static Pressure - in. w.g.
1.6 1.8 2.0 2.2 2.4 2.6
RPM Watts RPM Watts RPM Watts RPM Watts RPM Watts RPM Watts
1750    875     1548 1175  
2000   1425   1081 1540     1458
2250  1001 1480 1101       1700 
2500  1117       1700  1752 1810
2750 1547      1705     2004
  1425  1577 1715    1815   
    1787 1778  1828 2110    
 1748    1844       
  2048  2214     2012   
4000      2581   2084   
4250  2475     2111     
4500    2844 2140  2187     
4750 2124  2170         
5000            
5250            
5500            

Page 8
BLOWER DATA
POWER EXHAUST FAN PERFORMANCE
Return Air System Static Pressure Air Volume Exhausted
in. w.g. cfm
0
0.05 
0.10 
0.15 2410
0.20 
0.25 
 1420
 1200
MINIMUM AIR VOLUME REQUIRED FOR USE WITH OPTIONAL ELECTRIC HEAT
Electric Heat kW Minimum cfm
7.5 1750
15 2250
22.5 2250
 2750
45 2750
 
FACTORY INSTALLED OPTIONS/FIELD INSTALLED ACCESSORY AIR RESISTANCE - in. w.g.
Air
Volume
cfm
Wet Indoor Coil Electric
Heat Economizer
Filters Return Air
Adaptor
Plate
078, 092 102, 122, 150 MERV 8 MERV 13 MERV 16
1750 0.04 0.04  0.05 0.01   0.00
2000 0.05 0.05   0.01  0.08 0.00
2250   0.04 0.08 0.01 0.04  0.00
2500 0.07 0.07 0.04 0.11 0.01 0.05 0.10 0.00
2750 0.08 0.08 0.05 0.12 0.02 0.05 0.11 0.00
 0.10    0.02  0.12 0.02
 0.11 0.10  0.15 0.02   0.02
 0.12 0.11  0.15  0.07 0.15 0.04
 0.14   0.15  0.08  0.07
4000 0.15 0.14   0.04 0.08 0.17 
4250 0.17 0.15   0.04   0.11
4500  0.17 0.14 0.22 0.04  0.20 0.12
4750 0.20 0.18 0.17 0.25 0.05 0.10 0.21 
5000 0.22 0.20 0.20   0.10  0.18
5250 0.24 0.22 0.22   0.11 0.24 
5500 0.25  0.25  0.07 0.12 0.25 0.22
5750 0.27 0.25  0.45 0.07 0.12 0.27 0.25
  0.27  0.52 0.08  0.28 0.27


BLOWER DATA
CEILING DIFFUSERS AIR RESISTANCE - in. w.g.
󰀨 FD11 Flush
󰀨
Unit Size Air Volume
cfm 2 Ends Open 1 Side, 2 Ends Open
All Ends & Sides
Open

2400 0.21 0.18 0.15 0.14
 0.24 0.21 0.18 0.17
2800 0.27 0.24 0.21 0.20
   0.25 0.25
 0.41   
 0.50 0.45  
  0.54 0.48 0.44
   0.57 0.51

  0.28  0.15
 0.40   0.18
4000 0.44   0.21
4200  0.40  0.24
4400 0.54 0.44  0.27
   0.42 
4800    
5000  0.58 0.50 
5200 0.75  0.54 

4200 0.22   0.10
4400 0.28 0.24 0.20 0.12
   0.24 0.15
4800 0.40   
5000    
5200 0.52 0.44  0.27
5400 0.58   
  0.54 0.47 
5800 0.70  0.51 
CEILING DIFFUSER AIR THROW DATA
Model No. Air Volume
1󰀨
RTD11 Step-Down FD11 Flush
cfm ft. ft.


  
2800  
  
  
  


  
  
4000  
4200  
4400  
150

  
5800  
  
  
  
  
1󰀨


Page 10
ELECTRICAL/ELECTRIC HEAT DATA 6.5 TON
Model No. LHT078H4E
1Voltage - 60Hz 208/230V-3ph 460V-3ph 575V-3ph


  7.1 
 105  


 8.5  
 70  27


 2.8 1.4 1.1


 2.4  1
 15 15 20


   
 8.7 4.7 4.1
2


 50 25 20


50 25 20



  21 


42 22 17
ELECTRIC HEAT DATA
Electric Heat Voltage 208V 240V 480V 600V
2



Unit+

7.5 kW 4  70  25
15 kW 4 80  45 
22.5 kW 4 100 110  45
30 kW 4 125 150 70 




Unit+

7.5 kW    25
15 kW  85  
22.5 kW  107 55 
30 kW 118   52
2



Unit+



7.5 kW 70 70  
15 kW   45 
22.5 kW 4 100 110  45
30 kW 4 125 150 70 




Unit+



7.5 kW    
15 kW 81 87 45 
22.5 kW 100   44
30 kW 120   
ELECTRICAL ACCESSORIES
Disconnect 7.5 kW 54W56 54W56 54W56 54W56
15 kW 54W57 54W57 54W56 54W56
22.5 kW 54W57 54W57 54W56 54W56
30 kW 54W57 54W57 54W56 54W56

1
2

4