Lennox EL296UH070XV36B - Page 47

Page 47
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 congure 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 12 for operation sequence in applications
including EL296UHV, a thermostat which features hu-
midity control and a single-speed outdoor unit. TABLE 13
gives the operation sequence in applications with a two-
speed outdoor unit.
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 12
OPERATING SEQUENCE
Non-Communicating Thermostat with Humidity Control Feature and Single-Speed Outdoor Unit
OPERATING SEQUENCE SYSTEM DEMAND SYSTEM RESPONSE
System
Condition
Step
Thermostat Demand Relative Humidity
Compre
ssor
Blower
CFM
(cool)
Comments
Y1 O G W1 Status D
NO CALL FOR DEHUMIDIFICATION
Normal Operation 1 On On On Acceptable
24
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
24
VAC
High 100%
CS7500 thermostat
energizes Y1 and de-
energizes D on a call
for de-humidication
Dehumidication
call
2 On On On Demand 0 VAC High 70%
PRECISION MODE (operates independent of a Y1 demand)
Normal Operation 1 On On On Acceptable
24
VAC
High 100%
Dehumidication
mode begins when
humidity is greater
than set point
Dehumidication
Call
2 On On On Demand 0 VAC High 70%
Dehumidication
Call Only
1 On On On Demand 0 VAC High 70%
CS7500 thermostat
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
W914 (R to DS) on SureLight
®
control With Heat Pump - Cut W914 (R to DS) &
W951 (R to O) on SureLight
®
control
CS7000 thermostat to use for this application - Y2081 4 heat / 2 cool
*Dehumidication 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.