Variable Speed Motor (Vsm) Air Handler And Heat Pump - Option; (Zoning System) - Lennox HARMONY III Installation, Setup And User Manual

2.2. Variable Speed Motor (VSM) Air Handler and Heat Pump - Option 2 (Zoning System)
Discharge Air Sensor
(19V99) is included
Connection for remote vacation
switch or Humiditrol Accessory
Vacation OFF for individual
Vacation ON for all zones to be
conditioned at the same time.
Emergency Heat OFF to allow
Heat Pump to provide heat.
Emergency Heat ON to force
vide all heating (disallows heat
pump from providing any heat).
Figure 20. Option 2 - Typical Lennox Heat Pump and Lennox Variable-Speed Air Handler (Troubleshooting)
PRESSURE SWITCH
21J18 (HFC-22)
27W13 (HFC-410A
DAMPERS
(Spring open, power close)
zone control.
System Configuration & E-Heat
jumper settings
Thermostat 2 Thermostat 1
W C Y G R W C Y G R
NOTE: Select number of HP stages by placing jumper in appropriate position
(2-Stage HP illustrated)
20
CONNECT TO THE
SAME POWER
SUPPLY AS THE AIR
HANDLER
24
240
VAC VAC
ZONE CONTROL
TRANSFORMER
IMPORTANT
Connect thermostat gauge
wire to "C" terminal on heat
pump terminal strip.
NOTE: Do not wire "Y" wires(s)
from the Harmony III control
panel to the air handler
terminals strip. Doing so will
cause the motor to search
for proper CFM.
HEAT PUMP
R
C
Y1
Y2
O
W1
R
G
W1
W2
C
DS
IMPORTANT!
Y1
DO NOT MAKE
Y2 CONNECTIONS
TO Y1 AND Y2
VARIABLE
SPEED AIR
HANDLER