Lennox LB-114470G User manual

02/12 506872−01
*2P0212* *P506872-01*
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E2012 Lennox Industries Inc.
Dallas, Texas, USA
KITS AND ACCESSORIES Litho U.S.A.
506872−01
02/12 Danfoss RTC DDC KIT
INSTALLATION INSTRUCTIONS FOR DANFOSS RTC DDC LB−114470G (86W95)
USED WITH SCC/SGC UNITS
Shipping & Packing List
Package 1 of 1 contains:
1 − Danfoss RTC DDC assembly (A1)
1 − Return air sensor (A2) with P62 connector
1 − Discharge air sensor (RT1) with P63 connector
1 − Bracket, DDC controls
1 − Bag assembly containing:
4 − #8−32 X 1/2" screws
1 − Wiring diagram sticker
6 − #10−16 X 5/8" screws
Application
The Danfoss RTC DDC is used with SCC/SGC series
units.
An A2 return air sensor monitors return air temperature
and provides input to the DDC to determine unit heating or
cooling function.
An A74 room air sensor is used to monitor space tempera-
ture. Do not install the return air sensor if a room air sensor
is used. The room air sensor is wired to the Prodigy® con-
trol by the controls contractor.
The RT1 discharge air sensor monitors discharge or sup-
ply air temperature.
WARNING
Improper installation, adjustment, alteration, ser-
vice or maintenance can cause personal injury, loss
of life, or damage to property.
Installation and service must be performed by a
qualified installer or service agency.
CAUTION
Physical contact with metal edges and corners
while applying excessive force or rapid motion can
result in personal injury. Use caution when working
near these areas during installation or while servic-
ing this equipment.
WARNING
Electric shock hazard.
Can cause injury or death.
Before attempting to perform any
service or maintenance, turn the
electrical power to unit OFF at
disconnect switch(es).
Unit may have multiple power
supplies.
Installation
1. Disconnect all electrical power to unit.
2. Open compressor section access doors.
3. Depending on the size of unit, perform step 4 or 5.
4. 036, 060, 120 Units:Position DDC hinged mounting
panel as shown in figure 1. Make sure the DDC faces
the A55 Prodigy control board. Align holes on hinged
bracket with dimples on the unit side. Secure DDC
panel to unit with two 5/8" screws.
SECURE DDC ASSEMBLY TO UNIT
WITH TWO 5/8" SCREWS
DDC HINGED
MOUNTING PANEL A55 Prodigy
Control
DDC (Faces Prodigy®
Control)
UNIT SIDE
(WITH DIMPLES)
Figure 1. 036, 060, 120 Units − Installing DDC
Hinged Mounting Panel

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Pivot hinged panel away from Prodigy® control board
to access the DDC. See figure 2.
A55 Prodigy
control board
DDC
ASSEMBLY
DDC
Figure 2. 036, 060, 120 Units − Accessing DDC
(Top View)
5. 240 Units:Attach the hat section provided in the kit
to the DDC assembly using two 5/8" screws (see figure
3.)
HAT SECTION − USED
ON 240 UNITS ONLY
DDC HINGED
MOUNTING PANEL
HAT SECTION − USED
ON 240 UNITS ONLY
Figure 3. 240 Units − Attaching DDC Hinged
Mounting Panel to Hat Section
Position the DDC assembly as shown in figure 4. Make
sure the DDC faces the A55 Prodigy control board. Align
holes on hat section with dimples on the unit side. Secure
hat section to unit with four 5/8" screws.
UNIT SIDE
(WITH DIMPLES)
A55 PRODIGY
CONTROL
BOARD
DDC HINGED
MOUNTING
PANEL
DDC (Faces
A55 Prodigy
control board)
HAT SECTION
Figure 4. 240 Units − Installing DDC/Hat Section
Pivot hinged panel away from A55 Prodigy control
board to access DDC (see figure 5).
A55 Prodigy
control board
DDC
ASSEMBLY
DDC
HAT
SECTION
Figure 5. 240 Units − Accessing DDC (Top View)
Route harnesses coming from sub−assembly as shown in
figure 6 for the following steps 1 through 3.
1. Disconnect J264C from M2 board and connect to
P303 of controller sub−assembly.
2. Connect connectors (J297A, B and C) to M2 board
J297.
3. Route J63 Harness through conduit bushing.
4. Route harnesses coming from DDC Control sub−as-
sembly J63 down to lower blower support panel.
SCC/SGC 036/060 units: see Figure 7.
SCC/SGC 120/240 units: see Figure 8.
5. Route J62 Harness over top of blower section and in−
front of evaporator coil.
6. Continue to route J62 inside conduit on−top of filter
rack toward filter access door and economizer section.
See figure 9.

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NOVAR 2051
B3 B4B1 B2
Figure 6. Connecting DDC Jack/Plugs

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Discharge
Air Probe
P63/J63
RT1
Figure 7. Routing J63 RT1 Harness (036,060 Units)

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Discharge
Air Probe
P63/J63
RT1
Figure 8. Routing J63 RT1 Harness (120,240 Units)

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Return Air Sensor
1. Open filter access door.
2. Insert return air sensor probe into hole (location shown
in figure 9). Secure with screws provided.
3. Connect A2 return air sensor plug P62 to A2 return air
sensor jack J62.
NOTE − When an optional field−provided A74 room air sen-
sor is installed, the controls contractor wires the sensor to
Prodigy Controller P298 Terminal Strip. Do not install the
return air sensor in these applications.
A2 RETURN
AIR SENSOR
J62/P62 RETURN AIR SEN-
SOR JACK/PLUGS
FILTER
SECTION
Figure 9. Return Air Sensor
Discharge Air Sensor RT1
1. Insert discharge air sensor probe into knockout as
shown in figure 10 (036, 060 units) or figure 11 (120,
240 units). Secure with two screws provided.
RT1 DISCHARGE
AIR SENSOR
(DAS)
DAS
PROBE
P63/J63
DAS CON-
NECTIONS
Figure 10. RT1 Discharge Air Sensor
(036, 060 Units)
2. Connect RT1 discharge air sensor plug P63 to RT1
discharge air sensor jack J63.
RT1 DISCHARGE
AIR SENSOR (DAS)
DAS PROBE
P63/J63 DAS
CONNECTIONS
Figure 11. RT1 Discharge Air Sensor
(120, 240 Units)
Wiring
Field Wiring
Controls contractor completes field wiring connections to
optional system components shown in dotted lines in fig-
ure 13.
Wiring Diagrams
Wiring diagram sections are affixed to inside of unit pan-
el in alpha−numeric order. Figure12 shows an example
of acomplete system diagram onaninstallationconsist-
ing of an SGA240 unit with an electro−mechanical or
electroniccontrolsystemandamodulatingeconomizer.
Affix the C7" section wiring diagram, provided, over the
top of the existing C" section wiring diagram.
A2
Gas
Heating
Section
B7
Cooling or
Heating and
Cooling
Section
C2
Electro−
mechanical
Control
Section
D1
Modulating
Economizer
Section
AFFIX C7 WIRING DIAGRAM SECTION HERE
Figure 12. Complete System Diagram
Final Wiring Check
Before applying power to unit check the following wiring:
1. Jack/plug connections to DDC and RT1 sensor.
2. Jack/plug connections to system options such as elec-
tric heat or economizers.
3. Polarity of wiring between A16 control microproces-
sor, room air sensor if used, and TB1 terminal strip.
4. Line voltage to unit and/or options such as electric
heat.

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Figure 13. Control for SCC/SGC Units − Danfoss RTC

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Check−Out Procedure
Connect jumpers or toggle switches between the DDC out-
put terminals to simulate a thermostat demand and con-
firm proper unit operation. See figure 16. Refer to unit
installation instruction and Prodigy Control manual pro-
vided with unit.
1. Disconnect 24V power connector on DDC.
2. Use Prodigy Control manual to troubleshoot and/or
clear any errors codes from the Prodigy Control main
board readout.
3. Install a jumper wire across fan output terminals C and
NO.
4. Apply power to unit; blower will operate. Leave blower
jumper in place throughout check−out.
5. Manually activate stages of heating and cooling with
a jumper connection between terminal NO and C as
follows:
HEAT 1 First−stage heating
HEAT 2 Second−stage heating
COOL 1 First−stage cooling
COOL 2 Second−stage cooling
DAMPER Economizer
The corresponding indicating light on the A55 M2 main
control board should turn on. This indicates that the Prodi-
gy Control board is receiving a demand from the DDC. This
also indicates that wiring between the DDC output terminal
block and the Prodigy Control input terminal is correct for
each function.
IMPORTANT
Do not jumper cooling and heating outputs at the
same time.
6. Turn off power.
7. Remove all jumpers or toggle switches.
IMPORTANT − All field installed jumpers or toggle
switches should be removed after service has been
completed to ensure that unit control has been
switched back to the DDC.
8. Connect 24V power connector to DDC.
9. Restore power to unit. Check the SERVICE LED −
Flashing or steady-ON indicates replace board; OFF
indicates board OK.
10. Repeat check−out procedure if needed.
CAUTION:
REMOVE 24V
POWER
CONNECTOR
BEFORE UNIT
CHECK−OUT
JUMPER
ACROSS FAN
TERMINALS
C & NO
JUMPER
TERMINALS
C & NO TO
ACTIVAGE
STAGES − DO
NOT JUMPER
HEAT & COOL
AT SAME TIME!
COOL
2
DAMPER
(ECONOMIZER)
COOL
1
HEAT
2
HEAT
1
FAN
SERVICE LED
Figure 14. Danfoss RTC