Lennox SL297UHNV Series Installation and operation manual

Page 1
UNIT INFORMATIONUNIT INFORMATION
Service Literature
©2016 Lennox Industries, Inc.
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
HVAC installer or equivalent, service agency, or the
gas supplier.
CAUTION
As with any mechanical equipment, contact with
sharp sheet metal edges can result in personal
injury. Take care while handling this equipment and
wear gloves and protective clothing.
󰀩

       
         
       

        
-
  ®    -
        
󰀨
        
        
-

-


TABLE OF CONTENTS











SL297UHNV


COMMUNICATING-ENABLED SL297UHNV SERIES UNITS

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SPECIFICATIONS
Gas
Heating
Performance
 SL297UH040NV36B SL297UH060NV36B
1  
High
Fire
 40,000 
  
  


 
Low
Fire
  
  
  


 
High static - in. w.g. Heating  
  
Connections
in.
  
  
  
  
  
Indoor
Blower
  
  
  
  
Electrical Data  
  
  
Shipping Data   

1󰀩

SPECIFICATIONS
Gas
Heating
Performance
 SL297UH080NV48C SL297UH080NV60C
1  
High
Fire
  
  
  40-70


 
Low
Fire
  
  
  


 
High static - in. w.g. Heating  
  
Connections
in.
  
  
  
  
  
Indoor
Blower
  
  1
  
  
Electrical Data  
  
  
Shipping Data   

1󰀩



OPTIONAL ACCESSORIES - ORDER SEPARATELY
NOTE - FURNACES CANNOT BE TWINNED!
“B” Width
Models
“C” Width
Models

Horizontal Suspension Kit - Horizontal only 51W10 51W10
Return Air Base - Upow only 50W98 50W99
High Performance Economizer (Commercial Only) 10U53 10U53

Condensate Drain Heat Cable  26K68 26K68
 26K69 26K69
Crawl Space Vent Drain Kit US 51W18 51W18
 15Z70 15Z70

S30 Smart Wi-Fi Thermostat 19V30 19V30
1Remote Outdoor Air Temperature Sensor X2658 X2658
2Discharge Air Temperature Sensor 88K38 88K38

3Air Filter and
Rack Kit
 87L96 87L97
  
  44J22 44J22
 66K63 66K63
  

Page 4
BLOWER DATA
SL297UH040NV36B BLOWER PERFORMANCE (less lter)
BOTTOM RETURN AIR
0 through 0.8 in. w.g. (Heating) and 0 through 1.0 in. w.g. (Cooling) External Static Pressure Range
HEATING
1Heating Speed
DIP Switch Settings First Stage Heating Speed - cfm Second Stage Heating Speed - cfm
+24%  
+18% 1101 1099
+12%  1041
+6% 771 999
Factory Default 704 944
–6%  
–12%  
–18%  
COOLING
1Cooling Speed
DIP Switch Settings
First Stage Cooling Speed - cfm Second Stage Cooling Speed - cfm
Low Medium-Low Medium-High 2High Low Medium-Low Medium-High 2High
+   970 907 1072  
Factory Default       1117 
–441      1014 1142
1
2
󰀨



®
SL297UH040NV36B BLOWER PERFORMANCE (less lter)
SINGLE SIDE RETURN AIR
0 through 0.8 in. w.g. (Heating) and 0 through 1.0 in. w.g. (Cooling) External Static Pressure Range
HEATING
1Heating Speed
DIP Switch Settings First Stage Heating Speed - cfm Second Stage Heating Speed - cfm
+24%  1129
+18%  
+12%  1021
+6%  
Factory Default  
–6%  
–12%  
–18%  
COOLING
1Cooling Speed
DIP Switch Settings
First Stage Cooling Speed - cfm Second Stage Cooling Speed - cfm
Low Medium-Low Medium-High 2High Low Medium-Low Medium-High 2High
+      1217 
Factory Default   724  799  1109 
–      1002 
1
2
󰀨



®


SL297UH040NV36B BLOWER PERFORMANCE (less lter)
SINGLE SIDE RETURN AIR WITH OPTIONAL RETURN AIR BASE
0 through 0.8 in. w.g. (Heating) and 0 through 1.0 in. w.g. (Cooling) External Static Pressure Range
HEATING
1Heating Speed
DIP Switch
Settings
First Stage Heating Speed - cfm Second Stage Heating Speed - cfm
+24%  
+18%  
+12%  
+6%  770
Factory Default  
–6%  
–12%  
–18%  
COOLING
1Cooling Speed
DIP Switch
Settings
First Stage Cooling Speed - cfm Second Stage Cooling Speed - cfm
Low Medium-Low Medium-High 2High Low Medium-Low Medium-High 2High
+   947   1201 
Factory Default      949  
–   779    
1
2
󰀨



®
SL297UH060NV36B BLOWER PERFORMANCE (less lter)
BOTTOM RETURN AIR
0 through 0.8 in. w.g. (Heating) and 0 through 1.0 in. w.g. (Cooling) External Static Pressure Range
HEATING
1Heating Speed
DIP Switch Settings First Stage Heating Speed - cfm Second Stage Heating Speed - cfm
+24%  
+18% 1047 
+12%  1110
+6% 940 
Factory Default  999
–6%  947
–12%  
–18% 722 
COOLING
1Cooling Speed
DIP Switch Settings
First Stage Cooling Speed - cfm Second Stage Cooling Speed - cfm
Low Medium-Low Medium-High 2High Low Medium-Low Medium-High 2High
+   949   1212 
Factory Default       1107 
–  712     
1
2
󰀨



®


BLOWER DATA
SL297UH060NV36B BLOWER PERFORMANCE (less lter)
SINGLE SIDE RETURN AIR
0 through 0.8 in. w.g. (Heating) and 0 through 1.0 in. w.g. (Cooling) External Static Pressure Range
HEATING
1Heating Speed
DIP Switch Settings First Stage Heating Speed - cfm Second Stage Heating Speed - cfm
+24% 1114 
+18%  
+12% 1010 
+6%  
Factory Default  
–6%  942
–12%  
–18%  
COOLING
1Cooling Speed
DIP Switch Settings
First Stage Cooling Speed - cfm Second Stage Cooling Speed - cfm
Low Medium-Low Medium-High 2High Low Medium-Low Medium-High 2High
+ 749     1229 1404
Factory Default        1279
–      1011 1147
1
2
󰀨



®
BLOWER DATA
SL297UH060NV36B BLOWER PERFORMANCE (less lter)
SINGLE SIDE RETURN AIR WITH OPTIONAL RETURN AIR BASE
0 through 0.8 in. w.g. (Heating) and 0 through 1.0 in. w.g. (Cooling) External Static Pressure Range
HEATING
1Heating Speed
DIP Switch Settings First Stage Heating Speed - cfm Second Stage Heating Speed - cfm
+24%  1229
+18%  
+12% 992 1104
+6%  
Factory Default  
–6%  
–12%  
–18% 717 
COOLING
1Cooling Speed
DIP Switch Settings
First Stage Cooling Speed - cfm Second Stage Cooling Speed - cfm
Low Medium-Low Medium-High 2High Low Medium-Low Medium-High 2High
+     1042 1197 
Factory Default     799 949  1249
–    721   1122
1
2
󰀨



®

Page 7
BLOWER DATA
SL297UH080NV48C BLOWER PERFORMANCE (less lter)
BOTTOM RETURN AIR
0 through 0.8 in. w.g. (Heating) and 0 through 1.0 in. w.g. (Cooling) External Static Pressure Range
HEATING
1Heating Speed
DIP Switch Settings First Stage Heating Speed - cfm Second Stage Heating Speed - cfm
+24% 1499 
+18% 1427 
+12%  1472
+6% 1294 
Factory Default 1219 
–6%  1242
–12% 1090 
–18% 1007 1077
COOLING
1Cooling Speed
DIP Switch Settings
First Stage Cooling Speed - cfm Second Stage Cooling Speed - cfm
Low Medium-Low Medium-High 2High Low Medium-Low Medium-High 2High
+797  1071 1241 1102   
Factory Default    1147    
–    911   1422
1
2
󰀨



®
BLOWER DATA
SL297UH080NV48C BLOWER PERFORMANCE (less lter)
SINGLE SIDE RETURN AIR
0 through 0.8 in. w.g. (Heating) and 0 through 1.0 in. w.g. (Cooling) External Static Pressure Range
HEATING
1Heating Speed
DIP Switch Settings First Stage Heating Speed - cfm Second Stage Heating Speed - cfm
+24%  
+18%  
+12%  
+6% 1229 
Factory Default  
–6%  
–12% 1024 1107
–18%  
COOLING
1Cooling Speed
DIP Switch Settings
First Stage Cooling Speed - cfm Second Stage Cooling Speed - cfm
Low Medium-Low Medium-High 2High Low Medium-Low Medium-High 2High
+792    1104   
Factory Default     1001 1202  
– 771    1090  
1
2
󰀨



®


BLOWER DATA
SL297UH080NV48C BLOWER PERFORMANCE (less lter)
SINGLE SIDE RETURN AIR WITH OPTIONAL RETURN AIR BASE
0 through 0.8 in. w.g. (Heating) and 0 through 1.0 in. w.g. (Cooling) External Static Pressure Range
HEATING
1Heating Speed
DIP Switch Settings First Stage Heating Speed - cfm Second Stage Heating Speed - cfm
+24% 1407 
+18%  
+12%  
+6% 1217 
Factory Default  
–6%  
–12%  1114
–18%  
COOLING
1Cooling Speed
DIP Switch Settings
First Stage Cooling Speed - cfm Second Stage Cooling Speed - cfm
Low Medium-Low Medium-High 2High Low Medium-Low Medium-High 2High
+       
Factory Default        
–    920 1102  
1
2
󰀨



®
BLOWER DATA
SL297UH080NV60C BLOWER PERFORMANCE (less lter)
BOTTOM RETURN AIR
0 through 0.8 in. w.g. (Heating) and 0 through 1.0 in. w.g. (Cooling) External Static Pressure Range
HEATING
1Heating Speed
DIP Switch Settings First Stage Heating Speed - cfm Second Stage Heating Speed - cfm
+24% 1477 2011
+18%  
+12%  
+6% 1249 
Factory Default  
–6%  1477
–12%  
–18%  1291
COOLING
1Cooling Speed
DIP Switch Settings
First Stage Cooling Speed - cfm Second Stage Cooling Speed - cfm
Low Medium-Low Medium-High 2High Low Medium-Low Medium-High 2High
+1094       
Factory Default        2092
– 1021    1490  
1
2
󰀨



®

Page 9
BLOWER DATA
SL297UH080NV60C BLOWER PERFORMANCE (less lter)
SINGLE SIDE RETURN AIRboldand

0 through 0.8 in. w.g. (Heating) and 0 through 1.0 in. w.g. (Cooling) External Static Pressure Range
HEATING
1Heating Speed
DIP Switch
Settings
First Stage Heating Speed - cfm Second Stage Heating Speed - cfm
+24%  1952
+18%  1853
+12%  
+6%  
Factory Default  
–6%  
–12%  
–18%  
COOLING
1Cooling Speed
DIP Switch
Settings
First Stage Cooling Speed - cfm Second Stage Cooling Speed - cfm
Low Medium-Low Medium-High 2High Low Medium-Low Medium-High 2High
[phone]     2051 2239
Factory Default        2097
– 1044    1490  
1
2
󰀨



®

Page 10
Parts Arrangement
Heat Exchanger
Gas Valve
Combustion
Air Inducer
Indoor Blower
Two-Stage Control
Cabinet
Panel
Inner Panel
Gas Pipe Inlet
(right side only)
Inlet Vent Pipe
Exhaust Vent Pipe
Exhaust Coupling
Intake Air Assembly
Rollout Switch
Burner Assembly
FIGURE 1