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)