Balance Point Sensor 56A83; System Operation - Lennox Harmony III Installation Instructions Manual

Harmony IIIt Zone Control System Option 3 − Lennox Heat Pump &
PRESSURE SWITCH
51M08 (R−410A)
DAMPERS(Spring
open, power close)
DISCHARGE AIR SENSOR
88K38 (included)
Vacation OFF for individual zone
control.
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
auxiliary (backup) heat to provide
all heating (disallows heat pump
from providing any heat).
IMPORTANT! Connectivity is NOT COMPLETE until all electrical adjustments (jumpers and wiring changes) have been made.
See Electrical Adjustments for SureLight

System Operation

This section describes the operation of the zone control
system.
Zone Thermostats
Only electronic thermostats with a C" terminal may be
used with the zone control system. The zone control sys-
tem distinguishes between heat pump and heat/cool ap-
plications via the SYSTEM jumper placement on the zone
control board.
1. Cool / Heat / Auto−Changeover Modes Zone thermo-
stats send a heating or cooling signal to the zone con-
trol board. Thermostat servicing zone 1 is the central
control thermostat. Zones 2, 3 and 4 each have their
own thermostat. Thermostats may be standard or au-
tochangeover type.
Heat and cool demands present at the same time from
different zones (opposing demands) are satisfied on a
first come first served basis. If a heating demand and a
cooling demand reach the zone control board at the
same time, the heating demand is satisfied first. If op-
505023M 04/06
Lennox Variable-Speed Gas Furnace (Dual Fuel)
BALANCE POINT
21J18 (R−22) SENSOR 56A83
1 2 3
PS PS BPS BPS
Damper1
NC
NO
C
Damper2
NC
NO
Heat/cool staging jumper
C
settings − page 11.
Damper3
Heating
Staging Temp
NC
85
90
NO
100
110
C
120
130
Damper4
Cooling
NC Staging Temp
50
NO
55
60
C
Cont. Air
Reduction
0%
das
25%
50%
75%
Heating Air '
Reduction
Air reduction jumper
0%
settings − page 9.
20%
40%
ESD CAUTION
OFF
TOUCH A GROUNDED METAL
Vacation
Mode OBJECT BEFORE TOUCHING
Selector
THE CIRCUIT BOARD
ON
LENNOX
OFF
Harmony IIIt
V3.0 2004
E−Heat
Selector
TDO
ON
damper 4 damper 3 Damper 2
Thermostat 2
W C Y G R
Thermostat 4 Thermostat 3
W C Y G R W C Y G R
W C Y G R
PIAB jumper
settings − page 8.
Zone1 Zone3
PIAB PIAB
0%
OFF
10% 0%
20%
10%
30%
20%
40%
30%
50%
40%
60%
50%
70%
60%
80%
70%
90%
80%
100%
90%
NotUsed
100%
Zone2 Zone4
PIAB PIAB
OFF
OFF
0%
0%
10%
10%
20%
20%
30%
30%
40%
40%
50%
50%
60%
60%
70%
70%
80%
80%
90%
90%
100%
100%
SYSTEM E−HEAT
Configuration Stages
HP GAS
DF
1
2COOL 1COOL
2
2HP 1HP
3
System Configuration & E−Heat
jumper settings − page 11.
Fault
Recall
E−Heat Vacation
Damper 1 Mode Mode Fan Cooling
®
Board (page 6) and for BDC3 Board (page 7).
Figure 21
posing demands persist, the system will work to satis-
fy the current demand for a maximum of 20 minutes,
then switch over and try to satisfy the opposing de-
mand for a maximum of 20 minutes. When either de-
mand is satisfied, the system works to satisfy the other
demand.
NOTE − Allowing opposing demands to persist may
consume excess energy. If this condition continues,
check the installation (i.e. zone arrangement, supply
registers, return registers, zone loads etc.) and make
adjustments as necessary. Table 9 shows the time de-
lays that may be expected when opposing demands
are received from the zone thermostats.
The zone control system acknowledges a new or op-
posing demand as soon as it is received by illuminating
that zone's thermostat input lights. If the first demand
is not satisfied by the time the delays elapse, the sys-
tem switches over and begins satisfying the opposing
demand. During the switchover, a delay may be im-
posed before the system begins satisfying the new de-
mand.
Page 16
Thermostat 1
W C Y G R
C R
IMPORTANT
W C Y G R
Connect
thermostat-gauge
wire to SureLight
board C" terminal
NOTE − Do not wire Y" wire(s) from the
Harmony IIIt zone control board to the
furnace terminal strip. Doing so causes
the motor to search" for proper CFM.
HEAT PUMP
Y1
Y2
O
RC
W1−Def
Equipment
RH
G
W1
W2
W3
DS
Equipment
ElectHeating Heating Status
24
120
VAC
VAC
®
R
C
Y1
Y2
O
W1
R
G
W1
W2
C
DS
VARIABLE
SPEED
FURNACE