Lennox EL297DFV Series Unit Information page 29

On Board Links
Note: In communicating systems with a conventional out-
door unit (non-communicating), the on-board clippable
links must be set to properly configure the system.
On-Board Link W914 Dehum or Harmony (R to DS)
On-Board Link W914 Dehum or Harmony (R to DS) On-
board link W914, is a clippable connection between ter-
minals R and DS on the integrated control. W914 must
be cut when the furnace is installed with either the ZSV
varaiable zoning system control or a thermostat which
features humidity control. If the link is left intact the PMW
signal from the ZSV control will be blocked and also lead
to control damage
Refer to TABLE 10 for operation sequence in applications
including EL297DFV, a thermostat which features humidi-
ty control and a single-speed outdoor unit. TABLE 11 gives
the operation sequence in applications with a two-speed
outdoor unit.
Non-Communicating Thermostat with Humidity Control Feature and Single-Speed Outdoor Unit
OPERATING SEQUENCE
System
Step
Condition
NO CALL FOR DEHUMIDIFICATION
Normal Operation 1
BASIC MODE (only active on a Y1 thermostat demand)
Normal Operation 1
Dehumidification
2
call
PRECISION MODE (operates independent of a Y1 demand)
Normal Operation 1
Dehumidification
2
Call
Dehumidification
1
Call Only
Jumpers at indoor unit with a single stage outdoor unit. With Condensing unit - Cut
W914 (R to DS) on SureLight
W951 (R to O) on SureLight
CS7000 thermostat to use for this application - Y2081 4 heat / 2 cool
*Dehumidification blower speed is 70% of COOL speed for all units .
**In Precision mode, CS7000 thermostat will maintain room temperature up to 2 °F (1.2°C) cooler than room setting.
OPERATING SEQUENCE
SYSTEM DEMAND
Thermostat Demand
Y1 O G W1
On On On
On On On
On On On
On On On
On On On
On On On
control With Heat Pump - Cut W914 (R to DS) &
®
control
®
On-Board Link W951 Heat Pump (R to O)
On-board link W951 is a clippable connection between
terminals R and O on the integrated control. W951 must
be cut when the furnace is installed in applications which
include a heat pump unit and a thermostat which features
dual fuel use. If the link is left intact, terminal "O" will re-
main energized eliminating the HEAT MODE in the heat
pump.
On-Board Link W915 2 Stage Compr (Y1 to Y2)
On-board link W915 is a clippable connection between
terminals Y1 and Y2 on the integrated control. W915 must
be cut if two-stage cooling will be used. If the Y1 to Y2 link
is not cut the outdoor unit will operate in second-stage
cooling only.
TABLE 10
Relative Humidity
Status D
24
Acceptable
VAC
24
Acceptable
VAC
Demand 0 VAC
24
Acceptable
VAC
Demand 0 VAC
Demand 0 VAC
Page 29
SYSTEM RESPONSE
Blower
Compre
CFM
ssor
(cool)
Compressor and
High 100% indoor blower follow
thermostat demand
CS7500 thermostat
High 100%
energizes Y1 and de-
energizes D on a call
High 70%
for de-humidification
Dehumidification
High 100%
mode begins when
humidity is greater
High 70%
than set point
CS7500 thermostat
will try to maintain
room humidity setpoint
High 70% by allowing the room
space to maintain
a cooler room
thermostat setpoint**
Comments