Lennox SL280DFNV 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.
CAUTION
Failure to use properly sized wiring and circuit breaker
may result in property damage. Size wiring and circuit
unit rating plate.
-
tured with Lennox Duralok heat exchangers formed of alu-
minized steel. SL28DFV units are available in heating ca-
sizing.
SL280DFNV model units are equipped with a communi-
cating enabled SureLight®two-stage variable speed in-
tegrated control. SL280DFNV unit meets the California
Nitrogen Oxides (NOx) Standards and California Season-
Procedures outlined in this manual are presented as a
recommendation only and do not supersede or replace lo-
cal or state codes. In the absence of local or state codes,
the guidelines and procedures outlined in this manual (ex-
cept where noted) are recommendations only and do not
constitute code.
Table of Contents
Parts Arrangement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
I Unit Components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
II Placement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
III Start-Up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
IV Heating System Service Checks . . . . . . . . . . . . . . 28
SL280DFNV
COMMUNICATING -ENABLED SL280DFNV SERIES UNITS
Page 2
SPECIFICATIONS
Gas
Heating
Performance
Model No. SL280DF060NV36B SL280DF080NV60C
1 80% 80%
High
Fire
60,000 80,000
Temperature rise range - °F 25 - 55
Gas Manifold Pressure (in. w.g.)
Natural Gas Only
Low
Fire
52,000
Temperature rise range - °F 25 - 55
Gas Manifold Pressure (in. w.g.)
Natural Gas Only
1.5 1.5
High static - in. w.g. Heating 0.8 0.8
Cooling 1.0 1.0
Connections
in.
Gas pipe size IPS 1/2 1/2
Indoor
Blower
Wheel nominal diameter x width - in. 10 x 8 11-1/2 x 10
Motor output - hp 1/2 1.0
Tons of add-on cooling
Air Volume Range - cfm
Electrical Data Voltage 120 volts - 60 hertz - 1 phase
12.5
Maximum overcurrent protection 15 15
Shipping Data lbs. - 1 package
1
furnaces.
OPTIONAL ACCESSORIES - ORDER SEPARATELY
“B” Width Models “C” Width Models
CABINET ACCESSORIES
Downow Combustible Flooring Base 11M60 11M61
CONTROLS
S30 Smart Wi-Fi Thermostat 19V30 19V30
1 Remote Outdoor Temperature Sensor X2658 X2658
² Discharge Air Temperature Sensor 88K38 88K38
DOWNFLOW FILTER KITS
Downow Air Filter and Rack Kit 51W07 51W08
- in. (2) 16 x 20 x 1 (2) 16 x 20 x 1
1Remote Outdoor Temperature Sensor is used with conventional (non-Lennox®Communicating) outdoor units (sensor is furnished with Lennox®Communicating outdoor
2Optional for service diagnostics.
SL280DF060NV36B BLOWER PERFORMANCE (less lter)
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% 1065
+18% 1010 1105
+12% 1055
+6%
Factory Default 855
–6% 880
–12% 820
–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
+ 1000 1215
Factory Default 665 1220
–600 685 810 885
Settings.
2 Factory default setting.
Lennox®
SL280DF060NV36B BLOWER MOTOR WATTS (COOLING)
1Cooling Speed
DIP Switch
Settings
Motor Watts @ Various External Static Pressures - in. wg.
First Stage Second Stage
0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0
+ Setting
Cooling
Speed
Low 51 65 86 106 125 160 116 251
Med-Low 58 115 215 112 200 261 288
Med-High 115 156 215 152 228 265
High 102 156 182 228 252 508
Factory Default
Cooling
Speed
Low 56 128 158 118 166 188 212 256
Med-Low 151 168 188 88 216 268
Med-High 58 111 152 205 260
High 66 106 216 228
– Setting
Cooling
Speed
Low 65 81 162 58 118 165 202
Med-Low 52 88 106 152 110 155
Med-High 55 111 168 86 111 216 265
High 51 106 185 211 111 150
BLOWER DATA
BLOWER DATA
SL280DF080NV60C BLOWER PERFORMANCE (less lter)
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% 1610
+18% 1515
+12%
+6% 1255
Factory Default 1285
–6% 1100
–12% 1050
–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
+ 1220 1800 2000
Factory Default 1110 1250 1600 1820 2050
– 1855
Settings.
2 Factory default setting.
Lennox®
Page 5
Control box
Flue chase
Internal flue pipe assembly
Blower assemblyBlower assembly
Heat exchanger assembly
Air fuel intake assembly
Gas valve
Combustion air inducer
Access panel
Parts Arrangement
FIGURE 1
Page 6
I-UNIT COMPONENTS
The gas valve, combustion air inducer and burners can be
-
blower section.
SL280DFNV units are factory equipped with a bottom re-
removed as required for bottom air return. Markings are
.
ELECTROSTATIC DISCHARGE (ESD)
Precautions and Procedures
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)
A transformer located in the control box provides pow-
er tothe low voltage section of the unit. Transformers on
secondary.
2. Door Interlock Switch (S51)
-
ries with line voltage. When the inner blower access panel
is removed the unit will shut down.
CONTROL BOX
SureLight®Integrated Control
Interlock Switch
Transformer
Circuit Breaker
FIGURE 2
3. Circuit Breaker (CB8)
The switch provides overcurrent protection to the trans-
exceeds this limit the breaker will trip and all unit opera-
tion will shutdown. The breaker can be manually reset by
.
CIRCUIT BREAKER CB8
PRESS TO RESET
FIGURE 3
WARNING
Shock hazard.
Disconnect power before servicing. Integrated
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)
Units are equipped with the communicating enabled Sure-
Light®two-stage, variable speed integrated control. This
control is used with any communicating enabled thermo-
stat as part of a communicating comfort system. The con-
trol can also operate with a non-communicating conven-
tional single or two-stage thermostat. The system consists
The control and ignitor work in combination to ensure fur-
nace ignition and ignitor durability. The control provides
gas ignition, safety checks and indoor blower control with
two-stage gas heating.
The furnace combustion air inducer, gas valve and indoor
blower are controlled in response to various system inputs
such as thermostat signal, pressure and limit switch signal
-
switch circuit is open. The control also has two unpowered
-
At the beginning of the heat cycle the integrated control
inducer prove switch. The control will not begin the heating
Likewise the integrated control will not begin the second
stage heating cycle if the second stage prove switch is
heat pre-purge, the control will allow second stage heat.
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.
After the 15-second pre-purge period, the SureLight ig-
nitor warms up for 20 seconds after which the gas valve
-
four more times with an inter purge and warm-up time be-
ignition (including the initial trial), the control goes into
Watchguard-Flame Failure mode. After a 60-minute reset
period, the control will begin the ignition sequence again.
Two Stage Operation / Thermostat Selection DIP
Switch
selection is made using a DIP switch and must be posi-
tioned for the particular application. DIP switch 1, labeled
use with a two-stage thermostat. Move the DIP switch to
ON for use with a single stage thermostat.
While in the single-stage thermostat mode, the burners
-
ducer will operate on low speed and indoor blower will
operate on low heat speed. The unit will switch to second
-
be moved to the ON position for a 12 minute recognition
period, after which time the unit will switch to secondstage
heat.
While in the two-stage thermostat mode (two DIP switch
-
bustion air inducer will operate on low speed and indoor
blower will operate on low heat speed. The unit will switch
to second-stage heat on call from the indoor thermostat.
-
-
for more detail.
TABLE 1
SureLight®Control 5 Pin Terminal Designation
PIN# Function
1 Ignitor
2 Combustion Air Inducer High
Speed
Combustion Air Inducer Low
Speed
Combustuion Air Inducer
Neutral
5 Ignitor Neutral
TABLE 2
SureLight® Control 12 Pin Terminal Designation
PIN# Function
1 Gas Valve High Fire
2 Second Stage Prove Switch
Rollout In
Ground
5
6 Primary Limit In
Gas Valve Low Stage
8 Gas Valve Common
10 Ground
11 Rollout Switch Out
12 1st Stage Prove Switch
TABLE 3
SureLight®Control 6 Pin Terminal Designation
PIN# Function
1 Data Input From Motor
2 Common
Not Used
Data Output To Motor
5
6Not Used
Page 8
THERMOSTAT CONNECTIONS (TB1)
1/4” QUICK CONNECT TERMINALS
RS-BUS LINK (TB82, future use)
I+ = DATA HIGH CONNECTION
I - = DATA LOW CONNECTION
RS-BUS OUTDOOR (TB83)
R = 24VAC
I + = DATA HIGH CONNECTION
I - = DATA LOW CONNECTION
C = 24VAXC COMMON
RS-BUS INDOOR (TB84)
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
COMMUNICATING
OUTDOOR
EQUIPMENT
TB84
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-COMMUNICATINGNG
24V TERMINALS
HS/ CAI
FIGURE 4
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
910 11
12 14 15
910 11
12 14 15
910 11
12 14 15
8
8
8
8
8
8
8
81234567
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
Page 10
TABLE 4
Integrated Control Diagnostic Modes
Dispaly Action (when button released)
No change (idle)* Remain in idle mode
Discharge Air Installed
Program unit capacity/size (Unit Code)
Two horizontal bars = Soft disable
* No change implies the display will continue to show whatever is currently being displayed for normal operation (blinking decimal, active error code,
heat state, etc..)
Diagnostic LED (FIGURE 5)
Diagnostic Push Button (FIGURE 5)
The diagnostic push button is located adjacent to the sev-
be displayed. When the button is released, the displayed
item will be selected. Once all items in the menu have
been displayed, the menu resumes from the beginning
until the button is released.
Error Code Recall Mode
Flame Signal Mode
• Flame signal mode is exited after any of the follow-
ing: Power is reset
•
•
Program Unit Capacity/Size Mode
during that time, the control will start to display characters
displayed push button has to be released. Selected option
button has to be pressed and held for 5 seconds. Once
control accepts new setting it will store data in non-volatile
memory and reset itself. If 10 seconds expires or push
test mode and go into idle without changing programming
the unit size.
Soft Disable
a the device a message to be in soft disabling mode until
Steps to follow if the damper control module is displaying
the soft disable code.
1 -
(thermostat, damper control module, indoor and
outdoor).
2 - Cycle power to the control that is displaying the soft
disable code.
Put the room thermostat through set up.
Go to setup / system devices / thermostat / edit
/ then push reset.
5 - Go to setup / system devices / thermostat / edit /
then push resetAll.
Page 11
TABLE 5
Integrated Diagnostic Codes/Status of Equipment
Code Action Required to Clear and Recover
. Idle mode (Decimal blinks at 1 Hertz -- 0.5
second ON, 0.5 second OFF).
A Cubic feet per minute (cfm) setting for
indoor blower (1 second ON, 0.5 second
OFF) / cfm setting for current mode
displayed.
C Cooling stage (1 second ON, 0.5 second
OFF) / 1 or 2 displayed / Pause / cfm
setting displayed / Pause / Repeat codes).
d
1 second OFF) / cfm setting displayed /
Pause / Repeat Codes).
h Heat pump stage (1 second ON, 0.5
second OFF) / % of input rate displayed
/ Pause / cfm setting / Pause / Repeat
codes.
H Gas Heat Stage (1 second ON, 0.5 second
OFF) / 1 or 2 displayed / Pause / cfm
setting displayed / Pause / Repeat codes.
dF Defrost mode.
UDischarge Air Temperature
Device communication problem - No other
system).
errors. In most cases errors are related to electrical noise. Make sure
loose connections between the stat, indoor unit and outdoor unit. Check
for a high voltage source of noise close to the system. Fault clears after
communication is restored.
Low line voltage. Line Voltage Low (Voltage lower than nameplate rating). Check power line
voltage and correct. Alarm clears 5 seconds after fault recovered.
Low line voltage. Reverse line power voltage wiring. System resumes normal operation 5
seconds after fault recovered.
Ground not detected System shuts down. Provide proper earth ground. System resumes normal
operation 5 seconds after fault recovered.
High line voltage. Line Voltage High (Voltage higher than nameplate rating). Provide power
voltage within proper range. System resumes normal operation 5 seconds
after fault recovered.
Line voltage frequency out-of-range. No 60 Hertz Power. Check voltage and line power frequency. Correct
voltage and frequency problems. System resumes normal operation 5
seconds after fault recovered.
recovers.
Check for additional power-robbing equipment connected to system. May
require installation of larger VA transformer to be installed in furnace / air
handler. Clears after fault recovered.
control senses proper voltage.
Poor ground detected (Warning only) Provide proper grounding for unit. Check for proper earth ground to the
Unresponsive device. Communication
only.
Usually caused by delay in outdoor unit responding to indoor unit poling.
Recycle power. Check all wiring connections. Cleared after unresponsive
device responds to any inquiry.
Page 12
TABLE 5 Continued
Code Action Required to Clear and Recover
Active communicating thermostat signal
four wiring connections, ohm wires and cycle power at the
thermostat. Alert stops all services and waits for heartbeat
message from thermostat (subnet controller). Cleared after
valid thermostat (subnet controller) message is received.
Control failed self-check, internal error,
failed hardware. Will restart if error recov-
ers. Integrated control not communicating.
-
cuit faults, pin shorts, etc.).
Hardware problem on the control. Cycle power on control.
Replace if problem prevents service and is persistent. Criti-
Control internal communication problem. Hardware problem on the control. Cycle power on con-
trol. Replace if problem prevents service and is persistent.
Corrupted control parameters (Verify con-
-
ing is not available. Only applicable in the communicating
‘Set Factory Default mode Control will still operate on default
parameter settings
Outdoor air temperature sensor failure.
Only shown if shorted or out-ofrange.
Compare outdoor sensor resistance to temperature/ resis-
tance charts in unit installation instructions. Replace sensor
or air handler control will sense outdoor air and discharge
air temperature sensor(s). If detected (reading in range),
appropriate feature will be set as ‘installed’ and that could
be seen in ‘About’ screen. In normal operation after control
recognizes sensors, alarm will be sent if valid temperature
-
ration and make sure that temperature sensor is marked as
‘not installed’ in Indoor Unit ‘About’ screen. When Indoor unit
control is replaced, thermostat will ‘tell’ new control if tem-
fault recovered.
Hard lockout - Rollout circuit open or pre-
viously open.
Test furnace operation. Cleared after fault recovered.
Indoor blower communication failure - Un-
able to communicate with blower motor.
Indoor blower communication failure (including power out-
age). Lost communication with indoor blower motor. Possible
causes: motor not powered, loose wiring. Problem may be
on control or motor side. Cleared after fault recovered.
Indoor blower motor mis-match - Indoor
motor horsepower does not match unit ca-
pacity.
Incorrect appliance capacity code selected. Check for proper
after the correct match is detected following a reset. (Re-
move thermostat from system while applying power and re-
programming.)
Appliance capacity / size is NOT pro-
grammed. Invalid unit codes refer to con-
No appliance capacity code selected. Check for proper con-
guide or in installation instructions. Critical Alert. Cleared af-
ter valid unit code is read following a reset. (Remove thermo-
stat from system while applying power and reprogramming.)
Gas valve mis-wired. Check gas valve operation and wiring. Clears when repaired.
Gas valve control relay contact shorted. Check wiring on control and gas valve. If wiring is correct,
replace control.
TABLE 5 Continued
Code Action Required to Clear and Recover
Gas valve second-stage relay failure Furnace will operate on 1st stage for remainder of the
heating demand. Will clear after fault recovered. If un-
able to operate 2nd stage, replace control.
Hot surface ignitor sensed open. Measure resistance of hot surface ignitor. Replace if
-
sumes normal operation after fault is cleared.
Low pressure switch failed open. Check pressure (inches w.c.) of low pressure switch
closing on heat call. Measure operating pressure (inch-
es w.c.). Inspect vent and combustion air inducer for
correct operation and restriction. Resumes normal op-
eration after fault is cleared
Low pressure switch failed closed. Check operation of low pressure switch to see if it is
stuck closed on heat call longer than 150 seconds. Mea-
sure operating pressure (inches w.c.). Inspect vent and
combustion air inducer for correct operation and restric-
tion. Resumes normal operation after fault is cleared.
High pressure switch failed open. Check pressure (inches w.c.) of high pressure switch
closing on heat call. Measure operating pressure (inch-
es w.c.). Inspect vent and combustion air inducer for
correct operation and restriction. Resumes normal op-
eration after fault is cleared.
High pressure switch failed closed Check operation of high pressure switch closing on heat
call. Measure operating pressure (inches w.c.). Inspect
vent and combustion air inducer for correct operation
and restriction. Resumes normal operation after fault is
cleared.
Low pressure switch open during trial for ignition
or run mode.
Check pressure (inches w.c.) of low pressure switch
closing on heat call. Measure operating pressure (inch-
es w.c.). Inspect vent and combustion air inducer for
correct operation and restriction. Resumes normal op-
eration after fault is cleared.
Combustion air inducer calibration failure Unable to perform pressure switch calibration. Check
vent system and pressure switch wiring connections.
Resumes normal operation after fault is cleared.
-
sure switch did not close in allowed time. No action is
needed.
sensor. Measure voltage of neutral to ground to ensure
good unit ground. Alert clears after current heat call has
been completed.
Flame sensed out of sequence - Flame still pres-
ent.
-
essary. Alert clears when fault is recovered.
Limit switch circuit open.
lockout. Resumes normal operation after fault is cleared.
Discharge air temperature too high (gas heat only).
-
TABLE 5 Continued
Code Action Required to Clear and Recover
-
tries. Last retry failed due to the pressure switch
opening.
Check pressure (inches w.c.) of low pressure switch clos-
ing on heat call. Measure operating pressure (inches w.c.).
Inspect vent and combustion air inducer for correct oper-
-
cessfully.
-
cycles. Last recycle due to the pressure switch
opening.
Check operation of low pressure switch to see if it is stuck
closed on heat call. Check pressure (inches w.c.) of high
pressure switch closing on heat call. Measure operating
pressure (inches w.c.). Inspect vent and combustion air
inducer for correct operation and restriction. Clears when
-
-
Measure voltage of neutral to ground to ensure good unit
-
cycles. Last recycle failed due to the limit circuit
-
utes
Soft lockout - Flame sensed out of sequence.
Flame signal is gone.
Watchguard calibration failure. Unable to perform pressure switch calibration. Check vent
system and pressure switch wiring connections. 1-hour soft
Ignitor circuit fault - Failed ignitor or triggering cir-
cuitry.
Measure resistance of hot surface ignitor. Replace if open
performance. 1-hour soft lockout. Cleared when heat call
Indoor blower motor unable to start due to ob-
structed wheel, seized
bearings.
Indoor blower motor unable to start (seized bearing, stuck
wheel, etc.). Replace motor or wheel if assembly does not
operate or meet performance standards. 1-hour soft lock-
out. Clears after circulator successfully starts.
Combustion air inducer over current. Check combustion blower bearings, wiring and amps. Re-
place if does not operate or does not meet performance
standards. Clears after inducer current is sensed to be in-
range after the ignition following the soft lockout or reset.
Indoor blower motor temperature is too high. Indoor blower motor over temperature (motor tripped on
internal protector). Check motor bearings and amps. Re-
place if necessary. Cleared after blower demand is satis-
Discharge error temperature sensor failure. Only
shown if shorted or
out of range.
Compare outdoor sensor resistance to temperature/ re-
sistance charts in installation instructions. Replace sensor
-
onds after fault recovered. In Non- Communicating mode:
Cleared after the current heat call is completed.
Warning Only. Furnace blower in cutback mode due to
Page 15
TABLE 5 Continued
TABLE 5 Continued
Code Action Required to Clear and Recover
-
ous fan mode is lower than cfm setting.
-
duced CFM (Cutback Mode - The variable speed motor has pre-set
speed and torque limiters to protect the motor from damage caused
-
-
Indoor or outdoor unit capacity mismatch.
Communication only.
Incorrect indoor/outdoor capacity code selected. Check for proper
-
rameters. Alarm will clear when commissioning is exited. Cleared
after commissioning is complete.
Global network connection - Communica-
tion link problem.
For Future Use.
Replace integrated control.
unit.
did not close or the relay coil did not energize; no input back to IFC
unit.
relay coil did not energize; no input back to IFC chip). Critical Alert.
unit (Dual fuel module required for heat
pump application
wire. Applicable in non communicating mode. Critical Alert.
Interlock switch sensed open for 2 min-
utes.
and wait for interlock switch to close. The alarm will clear when
seconds or on a power reset.
LSOM - Compressor internal overload
tripped.
Check power to outdoor unit. Clears the error after current is sensed
in both RUN and START sensors for at least 2 seconds, or after
service is removed, or after power reset.
LSOM Compressor long run cycle or low
system pressure.
Compressor ran more than 18 hours to satisfy a single thermostat
run cycles or power reset. Also monitors low pressure switch trips.
LSOM - Outdoor unit system pressure
trip.
Discharge or suction pressure out-of-limits, or compressor over-
cycles.
LSOM - Compressor short-cycling. .(Run-
pressure trip
-
power reset.
LSOM - Compressor rotor locked. Com-
pressor short-cycling. (Running less than
Compressor rotor locked up due to run capacitor short, bearings
consecutive normal run cycles or after power reset.
LSOM - Compressor open circuit. Compressor circuit open (due to power disconnection, open fuse,
etc.) Clears the error after 1 normalcompressor run cycle.
Page 16
TABLE 5 Continued
Code Action Required to Clear and Recover
LSOM - Compressor open start circuit. Required amount of current is not passing through Start cur-
rent transformer. Clears the error after current is sensed in
START sensor, or after power reset.
LSOM - Compressor open run circuit. Required amount of current is not passing through Run current
transformer. Clears the error after current is sensed in RUN
sensor, or 1 normal compressor run cycle, or after power reset.
LSOM - Compressor contactor is welded. Compressor runs continuously. Clears the error after 1 normal
compressor run cycle or after power reset.
LSOM - Compressor low voltage. Secondary voltage is below 18VAC. After 10 minutes, oper-
ation is discontinued. Clears the code after voltage is higher
than 20 VAC for 2 seconds or after power reset.
DIP Switch Settings
NOTE - All communicating settings are set at the commu-
nicating thermostat. See thermostat installation instruc-
tion. In a communicating system all DIP switch and clippa-
ble link settings are ignored. For conventional thermostats
proceed with DIP switch and clippable link settings as out-
lined in the following.
Heating Operation DIP Switch Settings
Switch 1 -- Thermostat Selection -- This unit may be
used with either a single-stage or two-stage thermostat.
The thermostat selection is made using a DIP switch
which must be properly positioned for the particular appli-
cation. The DIP switch is factory-positioned for use with a
twostage thermostat. If a single-stage thermostat is to be
used, the DIP switch must be repositioned.
a.
two-stage heating thermostat (factory setting);
b.
a single-stage heating thermostat. This setting provides a
timed delay before second-stage heat is initiated.
Switch 2 -- Second Stage Delay (Used with Single-
Stage Thermostat Only) -- This switch is used to deter-
mine the second stage on delay when a single-stage ther-
mostat is being used. The switch is factory-set in the OFF
-
stage heat is initiated. If the switch is toggled to the ON
position, it will provide a 12-minute delay before second-
stage heat is initiated. This switch is only activated when
-
stage thermostat use.
Switches 3 and 4 -- Blower-O Delay -- The blower-on
(time that the blower operates after the heating demand
-
at the exact moment that the blower is de-energized. Lon-
-
tures; shorter settings provide higher supply air tempera-
TABLE 6
Blower O Delay Switch Settings
Blower O Delay
Seconds Switch 3 Switch 4
60 On
120 On
180 On On
Indoor Blower Operation DIP Switch Settings
Switches 5 and 6 -- Cooling Mode Blower Speed -- The
unit is shipped from the factory with the dip switches po-
settings. Switches 5 and 6 set the blower cfm for second-
stage cool. The integrated control automatically ramps
Refer to tables for corresponding cfm values.
TABLE 7
Cooling Mode Blower Speeds
Speed Switch 5 Switch 6
Low On On
Medium Low On
Medium High On
High (factory)
Switches 7 and 8 -- Cooling Blower Speed Adjustment
-- The unit is shipped from the factory with the dip switches
positioned for NORMAL (no) adjustment. The dip switches
may be positioned to adjust the blower speed by +10%
switch settings. Refer to tables for corresponding cfm val-
ues.
TABLE 8
Cooling Blower Speed Adjustment
Adjustment Switch 7 Switch 8
+10% (approx) On
Factory Default
-10% (approx)
Switches 9 and 10 -- Cooling Mode Blower Speed
Ramping -- -
-
mode blower speed ramping options that will result from
ramping options are detailed below.
TABLE 9
Cooling Mode Blower Speed Ramping
Ramping Switch 9 Switch 10
A (Factory)
On
C On
D On On
Ramping Option A (Factory Selection)
•
• -
utes.
•
• -
onds then ramps down to stop.
OFF
OFF
1/2 MIN
50% CFM
COMPRESSOR DEMAND
7 1/2 MIN
82% CFM
100%
CFM
1/2 MIN
50% CFM
Ramping Option B
•
-
• Once demand is met, motor ramps down to stop.
OFF
OFF
82%CFM 100% CFM
COMPRESSOR DEMAND
7 1/2 MIN
Ramping Option C
•
•
seconds then ramps down to stop
OFF
OFF
100% CFM 100% CFM
45 SEC.
COMPRESSOR
DEMAND
Ramping Option D
•
• Once demand is met, motor ramps down to stop.
OFFOFF
100% CFM
COMPRESSOR
DEMAND
Switches 11, 12 and 13 -- Heating Mode Blower Speed
The switches are factory set to the OFF position which
increases or decrease to both high and low heat demand
TABLE 10
Heating Mode Blower Speeds
Heat Speed Switch 11 Switch 12 Switch 13
On On On
Increase 18% On On
Increase 12% On On
Increae 6% On
Factory
Default
Decrease 6% On
Decrease
12%
On
Decrease
18%
On On
Switches 14 and 15 -- Continuous Blower Speed --
TABLE 11
Continuous Blower Speed
Switch 15
28% of High Cool Speed On
(Factory)
On
100% of High Cool Speed On On
Page 18
On-Board Links
Note: In communicatiung systems with a conventional
outdoor unit (non-communicating), the on-board clippable
links must be set to properly congure the system.
WARNING
Failure to properly set DIP switches, jumpers and on-
board links can result in improper operation!
On-Board Link W914 Dehum or Harmony (R to DS)
be cut when the furnace is installed with either the Harmo-
ny III zone control or a thermostat which features humidity
control. If the link is left intact the PMW signal from the
Harmony III control will be blocked and also lead to control
applications including SL280UHNV, a thermostat which
features humidity control and a single-speed outdoor unit.
with a two-speed outdoor unit.
On-Board Link W951 Heat Pump (R to O)
be cut when the furnace is installed in applications which
include a heat pump unit and a thermostat which features
-
pump.
On-Board Link W915 2 Stage Compr (Y1 to Y2)
is not cut the outdoor unit will operate in second-stage
cooling only.
TABLE 12
OPERATING SEQUENCE
SL280DFV Non-Communicating Thermostat with Humidity Control Feature and Single-Speed Outdoor Unit
System
Condition Step
Thermostat Demand Relative Humidity Compre
ssor
CFM
(cool)
Comments
O G W1 Status D
NO CALL FOR DEHUMIDIFICATION
Normal Operation 1 On On On Acceptable
VAC High 100%
Compressor and
indoor blower follow
thermostat demand
BASIC MODE (only active on a Y1 thermostat demand)
Normal Operation 1 On On On Acceptable
VAC High 100%
energizes D on a call
call 2 On On On Demand 0 VAC High
PRECISION MODE (operates independent of a Y1 demand)
Normal Operation 1 On On On Acceptable
VAC High 100%
mode begins when
humidity is greater
than set point
Call 2 On On On Demand 0 VAC High
Call Only 1 On On On Demand 0 VAC High
will try to maintain
room humidity setpoint
by allowing the room
space to maintain
a cooler room
thermostat setpoint**
Jumpers at indoor unit with a single stage outdoor unit. With Condensing unit - Cut
Use CS7500 thermostat to use for this application - Y2081 4 heat / 2 cool
*Dehumidication blower speed is 70% of COOL speed for all units .
**In Precision mode, CS7500 thermostat will maintain room temperature up to 2 °F (1.2°C) cooler than room setting.
TABLE 13
OPERATING SEQUENCE
SL280DFV, Non-Communicating Thermostat with Humidity Control Feature and Two-Speed Outdoor Unit
System
Condition Step
Thermostat Demand Relative Humidity Compre
ssor
CFM
(cool)
Comments
O G W1 W2 Status D
NO CALL FOR DEHUMIDIFICATION
Normal Operation
1 On On On Acceptable
VAC Low Compressor and indoor
blower follow thermostat
demand
Normal Operation
2 On On On On Acceptable
VAC High 100%
ROOM THERMOSTAT CALLS FOR FIRST STAGE COOLING
Normal Operation 1 On On On Acceptable
VAC Low
energizes D on a call for
call 2 On On On On Demand 0
VAC High
Normal Operation 1 On On On Acceptable
VAC Low
begins when humidity is
greater than set point
Call 2 On On On On Demand 0
VAC High
Call Only 1 On On On On Demand 0
VAC High
will try to maintain
room humidity setpoint
by allowing the room
space to maintain a
cooler room thermostat
setpoint**
ROOM THERMOSTAT CALLS FOR FIRST AND SECOND STAGE COOLING
Normal Operation 1 On On On On Acceptable
VAC High 100%
energizes D on a call for
Call 2 On On On On Demand 0
VAC High
Normal Operation 1 On On On Acceptable
VAC Low
begins when humidity is
greater than set point
Call 2 On On On On Demand 0
VAC High
1 On On On On Demand 0
VAC High
will try to maintain
room humidity setpoint
by allowing the room
space to maintain a
cooler room thermostat
setpoint***
Jumpers at indoor unit with a two stage outdoor unit
Use CS7500 thermostat to use for this application - Y2081 4 heat / 2 cool
*Normal operation rst stage cooling blower speed is 70% COOL speed.
**Dehumidication blower speed is, reduced to 70% of COOL.
***In Precision mode, CS7500 thermostat will maintain room temperature up to 2 °F (1.2°C) cooler than room setting.
Page 20
B- Indoor Blower Motor
To Remove Blower From Unit:
1. Disconnect Power, 2. Remove internal flue pipe and chase
3. Remove Control Box 4. Remove Bolts. 5. Unplug Motor
Wires From Control Board. Then Slide Out Front of Unit.
Supply Air Blower
power
choke
blower wheel
blower motor
FIGURE 6
WARNING
energy that may interfere with pacemaker operation.
Interference is reduced by both the sheet metal cabinet
and distance.
IMPORTANT
models are not interchangeable with motors used on the
SL280DF furnace line.
that may interfere with pacemaker operation. Interference
is reduced by both the sheet metal cabinet and distance.
The motor communicates with the integrated control via
a 2-way serial connection. The motor receives all neces-
sary functional parameters from the integrated control and
does not rely on a factory program like traditional variable
speed motors. SL280DFNV units use a three-phase, elec-
tronically controlled D.C. brushless motor (controller con-
verts single phase a.c. to three phase D.C.), with a perma-
has a permanent magnet rotor it does not need brushes
like conventional D.C. motors.
The stator windings are split into three poles which are
electrically connected to the controller. This arrangement
the controller.
A solid-state controller is permanently attached to the mo-
tor. The controller is primarily an A.C. to D.C. converter.
Converted D.C. power is used to drive the motor. The con-
troller contains a microprocessor which monitors varying
conditions inside the motor (such as motor workload).
BLOWER MOTOR COMPONENTS
STATOR
(WINDINGS)
BEARING
ROTOR
FIGURE 7
The controller uses sensing devices to sense what posi-
-
tion of the rotor and then switching the motor windings on
All SL280DFNV blower motors use single phase power.
An external run capacitor is not used. The motor uses per-
manently lubricated ball-type bearings.
Internal Operation
The motor is controlled via serial communication between
the integrated control on the furnace and the controller
attached to the motor shell. The messages sent back and
forth between the two controls serve to communicate rota-
tional direction, demand, motor size, current draw, torque,
and rpm, among other variables.
Motor rpm is continually adjusted internally to maintain
constant static pressure against the blower wheel. The
controller monitors the static work load on the motor and
motor ampdraw to determine the amount of rpm adjust-
-
bles. The cfm remains relatively stable over a broad range
of static pressure. Since the blower constantly adjusts rpm
refer to blower cfm regardless of motor rpm.
Initial Power Up
If the disconnect switch is bounced when the disconnect is
closed, the disconnect contacts may become welded. Try
not to bounce the disconnect switch when applying power
to the unit.
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