Lennox HARMONY II, Installation Instructions Manual, Page: 28 / 30

Page 28
505023M 04/06
-
Fuses OK?
-
Error code present? If so,
see troubleshooting/diag-
nostic section of this
manual (Page 25).
-
Are PIAB jumpers set
correctly?
-
Only 1 jumper per
Zone? (Zone Control
System Jumper Set-
tings (Page 8)
-
Is discharge
probe installed?
-
Is probe located
in discharge air
plenum as de-
scribed on
Page 5?
-
Is it wired cor-
rectly?
-
Does outdoor unit respond to demand?
-
Is it operating properly?
-
Test Defrost. Does outdoor unit initiate and terminate defrost correctly?
-
W1 energized during defrost?
-
Does zone control system respond appropriately during defrost?
-
Are appropriate outputs energized in response to demand?
-
Does zone control system energize appropriate outputs? During Cooling? During
Heating? During Defrost? During Emer. Heating?
-
24VAC from furnace transformer to R?
-
Does indoor unit respond to outputs? Cooling? Heating? Defrost? Emer. Heating?
-
Does blower speed change as zone demand changes? If no, does DS output vary
from 0 to 25VDC?
-
Are Reduction jumpers
set correctly? Heating Air
Reduction must be 0%.
-
Do jumpers provide ap-
propriate speed reduc-
tion? If no, check indoor
unit before replacing
zone control board.
-
Pressure Switch installed. in cor-
rect position?
-
Does switch open when high pres-
sure condition is simulated (tempo-
rarily blocking airflow in heating
mode)?
-
Does zone control system respond
appropriately when high pressure
condition is simulated (temporarily
disconnecting switch simulates
high pressure).
System Troubleshooting − Harmony III
t
Zone Control System Option 2 −
Lennox Heat Pump & Lennox Variable-Speed Coil Blower
-
Are thermostats wired correctly?
-
Does zone control system respond appropriately to demand?
-
Does electronic thermostat have relay switching output? If relay with SCR output is used, not,
isolation relays may need to be used.
-
24VAC supplied to each thermostat terminal R from zone control system?
-
Check each thermostat for output signal when calling. Heating output W1? Cooling output Y1?
-
Do dampers respond to demand? 0
volts AC = open. 24 volts AC = closed.
Dampers should drive closed when 24
volts is jumpered to damper motor.
-
Is wiring correct & in good condition?
-
Line Voltage to transformer?
-
24VAC from transformer to
zone control system?
-
Are all wire connections
good? Are all wire connec-
tions correct?
Figure 24
-
Are jumpers set cor-
rectly for auxiliary heat
and cooling? (Page 11)
BPS BPS PS PS
DAMPERS
85
90
100
110
120
130
0%
10%
20%
30%
40%
50%
60%
70%
80%
90%
100%
NotUsed
OFF
0%
10%
20%
30%
40%
50%
60%
70%
80%
90%
100%
Zone4
PIAB
Zone1
PIAB
Zone2
PIAB
Zone3
PIAB
SYSTEM
Configuration
E−HEAT
Stages
Heating
Staging Temp
50
55
60
Cooling
Staging Temp
0%
20%
40%
0%
25%
50%
75%
OFF
0%
10%
20%
30%
40%
50%
60%
70%
80%
90%
100%
OFF
0%
10%
20%
30%
40%
50%
60%
70%
80%
90%
100%
Cont. Air
Reduction
Heating Air ‘
Reduction
DF
1
2
3 HP
2COOL
2HP
GAS
1COOL
1HP
TDO
Fault
Recall
Vacation
Mode
Selector
E−Heat
Selector
1/2 AMP
DS FUSE
S
P
ARE DS FUSE
3 AMP
P
ANEL FUSE
S
P
ARE P
ANEL FUSE
Thermostat 4 Thermostat 3
W C Y G R W C Y G R
Balance
Point
Sensor
Pressure Switch
Diag4 Diag3 Diag2 Diag1
E−Heat Vacation
damper 4 damper 3 Damper 2 Damper 1 Mode Mode Fan Cooling ElectHeating Heating Status
PRESSURE
SWITCH
ESD CAUTION
TOUCH A GROUNDED METAL
OBJECT BEFORE TOUCHING
THE CIRCUIT BOARD
LENNOX
Harmony III
t
V3.0 2004
System Configuration & E−Heat jumper
settings − page 11.
piab jumper settings −
page 8.
air reduction jumper
settings − page 9.
heat/cool staging
jumper settings − page
11.
120
VAC
24
VAC
C R
Damper1
NC
NO
C
das
Damper2
NC
NO
C
Damper3
NC
NO
C
Damper4
NC
NO
C
Thermostat 2 Thermostat 1
W C Y G R
W C Y G R
W C Y G R
W C Y G R
Y1
Y2
O
RC
W1−Def
R
C
Y1
Y2
O
W1
R
G
W1
W2
C
DS
RH
G
W1
W2
W3
DS
Equipment
Equipment
DISCHARGE AIR SENSOR
HEAT PUMP
VARIABLE SPEED
BLOWER COIL
THERMOSTATS