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.
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® -
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TABLE OF CONTENTS
SL297UHNV
COMMUNICATING-ENABLED SL297UHNV SERIES UNITS
Page 2
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 - Upow 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 AIRboldand
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
+1094 1279 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
Page 11
I-UNIT COMPONENTS
CAUTION
Electrostatic discharge can aect electronic
components. Take precautions to neutralize
electrostatic charge by touching your hand and
tools to metal prior to handling the control.
A- Control Box
1. Control Transformer (T1)
2. Door Interlock Switch (S51)
-
CONTROL BOX
Transformer
SureLight
®
Integrated Control
Interlock Switch
Circuit Breaker
FIGURE 2
Circuit Breaker (CB8)
-
-
CIRCUIT BREAKER CB8
PRESS TO RESET
FIGURE 3
WARNING
Shock hazard.
Disconnect power before servicing. Control is not
eld repairable. If control is inoperable, simply
replace entire control. Can cause injury or death.
Unsafe operation will result if repair is attempted.
4. Integrated Control (A92)
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®
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Electronic Ignition
Page 12
-
-
NOTE - During abnormal conditions such as low supply
voltage or low outdoor temperatures and the low re pres-
sure switch does not close, the combustion air inducer will
switch to high re. After a 15 second pre-purge the high
re pressure switch will close and the unit will begin op-
eration on high re. After 10 to 20 seconds of high re
operation the unit will switch to low re
®ig-
Two Stage Operation / Thermostat Selection DIP
Switch
-
-
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-
TABLE 1
5 Pin Terminal Designation
Pin# Function
1
2
4
TABLE 2
12 Pin Terminal Designation
Pin# Function
1
2
4
7
9
10
11
12
TABLE 3
5 Pin Terminal Designation
Pin# Function
1
2
4
INTEGRATED CONTROL
THERMOSTAT CONNECTIONS (TB1)
1/4” QUICK CONNECT TERMINALS
TB83 icomfort Communicating Outdoor Equipment
R = 24VAC
I + = DATA HIGH CONNECTION
I - = DATA LOW CONNECTION
C = 24VAXC COMMON
R = 24VAC
I + = DATA HIGH CONNECTION
I - = DATA LOW CONNECTION
C = 24VAXC COMMON
FLAME SENSE
DIP SWITCHES
OUTDOOR AIR
SENSOR
TERMINALS
DISCHARGE AIR
SENSOR
TERMINALS
INDOOR
BLOWER
CONNECTOR
NEUTRAL
DIAGNOSTIC
PUSH BUTTON
TB83
icomfort
COMMUNICATING
OUTDOOR
EQUIPMENT
TB84
icomfort
COMMUNICATING
INDOOR
THERMOSTAT
DS = DEHUMIDIFICATION SIGNAL
W2 = HEAT DEMAND FROM 2ND STAGE T/STAT
W1 = HEAT DEMAND FROM 1ST STAGE T/STAT
R = CLASS 2 VOLTAGE TO THERMOSTAT
G = MANUAL FAN FROM T'STAT
C = THERMOSTAT SIGNAL GROUND CONNECTED TO
TRANSFORMER GRD (TR) & CHASIS GROUND (GRD)
Y1 = THERMOSTAT 1ST STAGE COOL SIGNAL
Y2 = THERMOSTAT 2ND STAGE COOL SIGNAL
O = THERMOSTAT SIGNAL TO HEAT PUMP
REVERSING VALVE
L = USE ONLY WITH A COMMUNICATING THERMOSTAT
AND A NON-COMMUNICATING OUTDOOR UNIT
DH = DEHUMIDIFICATION OUTPUT COMMUNICATING
THERMOSTAT ONLY
HUM = UNPOWERED NORMALLY OPEN (DRY) CONTACTS
XMFR = 120 VAC OUTPUT TO TRANSFORMER
LI = 120 VAC INPUT TO CONTROL
ACC = 120 VAC OUTPUT TO OPTIONAL ACCESSORY
NEUTRALS = 120 VAC NEUTRAL
W915 Y1 TO Y2
2 STAGE COMPR
W951 R TO O
HEAT PUMP
W914 R TO DS
DEHUM OR
HARMONY
W1 W2 G Y2 Y1 CCRDHL ODS
RI +I- CRI +I- C
7 SEGMENT LED
ACC
LINE 1
HUM
12 PIN LOW
VOLTAGE
CONNECTOR
NON-COMMUNICATING
24V TERMINALS
HS/ CAI
TB84 icomfort Communicating Indoor Thermostat
FIGURE 4
Page 14
HEATING BLOWER−OFF DELAY
60 SECOND
HTG BLOWER
OFF DELAY
120 SECOND
HTG BLOWER
OFF DELAY
180 SECOND
HTG BLOWER
OFF DELAY
FLAME
15
HSI/CAI
2ND STAGE HEAT ON DELAY
7 MIN
UPSTAGE
DELAY
12 MIN
UPSTAGE
DELAY
*CONTINUOUS FAN MODE BLOWER SPEED
COOLING MODE BLOWER RAMPING
CLG BLOWER SPEED ADJUSTMENT
COOLING MODE BLOWER SPEED
W915
2 STAGE
COMPR
1−STG COMPRESSOR
2−STAGE
COMPRESSOR LINK
(JUMPERS Y1 to Y2)
W915
DO NOT CUT
2−STG COMPRESSOR
HEAT PUMP LINK
(JUMPERS R to O)
W951
DEHUMIDIFICATION−
HARMONY LINK
(JUMPERS R to DS)
W914
W915
2 STAGE
COMPR
CUT LINK
A/C UNIT
DO NOT CUT
HEAT PUMP UNIT
CUT LINK
W951
HEAT
PUMP
W951
HEAT
PUMP
W914
DEHUM
or
NO HARMONY ZONING
OR
NO SIGNATURESTAT
W/ DS CONNECTION
DO NOT CUT
HARMONY ZONING
OR
SIGNATURESTAT W/
DS CONNECTION
CUT LINK
HARMONY
W914
DEHUM
or
HARMONY
1
1
1
ON−BOARD LINK
OPTION SELECTION
1234567
1234567
123567
4
123567
4
NEUTRALS
L1
ACC
HUM
14
36
P79
110
312
J2
4 7
W915
2 STAGE
COMPR
W951
HEAT
PUMP
W914
DEHUM
HARMONY
CUT FOR
OPTION
SELECTION
OUTDOOR
SENSOR
DISCHARGE
AIR SENSOR
123456
10 12
91113
ON
ON
SureLight
W1W2 GY2 Y1 CC DH LODSR
W1
W2
G
Y2
Y1
C
C
R
L
DH
HIGH
SPEED
(100%)
MEDIUM−HIGH
SPEED
(70%)
MEDIUM−LOW
SPEED
(38%)
LOW
SPEED
(28%)
*
OPTION A
OFF−50%−82%−
100%−50%−OFF
OPTION B
OFF−82%−100%−OFF
OPTION C
OFF−100%−100%−OFF
OPTION D
OFF−100%−OFF
*
DEFAULT
+ 10%
− 10%
*
HIGH
SPEED
MEDIUM−HIGH
SPEED
MEDIUM−LOW
SPEED
LOW
SPEED
*
7
−PROTECTIVE PLASTIC FILM ON DIP SWITCHES MAY BE
REMOVED FOR EASE IN SETTING OF DIP SW.
−CUT ON−BOARD LINK (SOLDER TRACE) COMPLETELY THROUGH
BOTH LAYERS ON THE CONTROL BOARD
−LINKS CUT IN ERROR −INSTALL A JUMPER ON THE APPROPRIATE
TERMINALS ON THE TERMINAL STRIP
1
910 11
12 13
14
ON
ON
ON
ON
ON
ON
ON
ON
90 SECOND
HTG BLOWER
OFF DELAY
*1234567
ON
1234567
ON
THERMOSTAT SELECTION
1−STAGE
THERMOSTAT
(TIMED STAGING)
−SEE SW #2
TWO STAGE
THERMOSTAT
*1234567
1234567
ON
ON
−BLOWER ON DELAY − 30 SEC. FIXED
15
9
10 11
12 14 15
9
10 11
12 14 15
9
10 11
12 14 15
8
8
8
8
8
8
8
8
1234567
1234567
ON
ON
1234567
ON
1234567
ON
8
8
8
8
9
10 11
12 13
14
ON
ON
ON
ON
15
910 11
12 14 15
910 11
12 14 15
9
10 11
12 14 15
910 11
12 13
14
ON
ON
ON
ON
15
910 11
12 14 15
910 11
12 14 15
910 11
12 14 15
HEATING MODE BLOWER SPEED
1234567
ON
1234567
ON
1234567
ON
8
8
8
910 11
12 13
14
ON
ON
ON
ON
15
9
10 11
12 14 15
910 11
12 14 15
9
10 11
12 14 15
FACTORY
DEFAULT
+ 24%
+ 18%
+ 12%
+ 6%
− 6%
− 12%
− 18%
8
14 15
INCREASE AIR HTG CFM
DECREASE AIR HTG CFM
SENSE
RI+ I− CRI+ I− C
OUTDOOR EQUIPMENT
I+ I−
INDOOR EQUIPMENT
IGN
CAI2
CAI1
N
N
J3
S1
S4S3
13
13
13
13
13
13
13
* FACTORY DEFAULT
13
13
*
DIAGNOSTIC
LED
DIAGNOSTIC
PUSH BUTTON
INTEGRATED CONTROL CONFIGURATION GUIDE
FIGURE 5
TABLE 4
Integrated Control Diagnostic Modes
Diagnostic LED (FIGURE 4)
Diagnostic Push Button (FIGURE 4)
-
-
Error Code Recall Mode
Flame Signal Mode
•
•
•
Program Unit Capacity/Size Mode
Soft Disable
1 -
2 -
4 - setup / system devices / thermostat / edit
/ then reset.
setup / system devices / thermostat / edit
resetAll.
TABLE 5
Integrated Diagnostic Codes/Status of Equipment
d
H
U
Page 17
TABLE 5 Continued
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-
-
-
-
-
-
-
-
-
-
-
-
-
-
TABLE 5 Continued
-
-
-
-
-
-
-
-
-
-
-
-
-
-
Page 19
TABLE 5 Continued
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-
utes
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Page 20
TABLE 5 Continue
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