Lennox Harmony III Installation Instructions Manual page 28

System Troubleshooting − Harmony IIIt Zone Control System Option 2 −
-
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).
-
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?
DAMPERS
-
Is discharge
probe installed?
-
Is probe located
in discharge air
plenum as de-
scribed on
Page 5?
-
Is it wired cor-
rectly?
DISCHARGE AIR SENSOR
-
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.
-
Are PIAB jumpers set
correctly?
-
Only 1 jumper per
Zone? (Zone Control
System Jumper Set-
tings (Page 8)
-
Are jumpers set cor-
rectly for auxiliary heat
and cooling? (Page 11)
505023M 04/06
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?
PRESSURE
SWITCH
PS PS BPS BPS
Damper1
NC
NO
C
Damper2
NC
heat/cool staging
NO jumper settings − page
11.
C
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
das 0%
25%
50%
75%
Heating Air '
Reduction
air reduction jumper
0%
settings − page 9.
20%
40%
ESD CAUTION
Vacation
TOUCH A GROUNDED METAL
Mode
OBJECT BEFORE TOUCHING
Selector
THE CIRCUIT BOARD
LENNOX
Harmony IIIt
V3.0 2004
E−Heat
Selector
TDO
damper 4 damper 3 Damper 2
-
Error code present? If so,
see troubleshooting/diag-
nostic section of this
manual (Page 25).
Thermostat 2
THERMOSTATS
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
-
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?
Figure 24
Page 28
-
Line Voltage to transformer?
-
24VAC from transformer to
zone control system?
-
Are all wire connections
good? Are all wire connec-
tions correct?
Thermostat 1
W C Y G R
C R
W C Y G R
-
Fuses OK?
Y1
Y2
O
RC
W1−Def
Equipment
RH
G
W1
W2
W3
DS
Equipment
VARIABLE SPEED
BLOWER COIL
ElectHeating Heating Status
24
120
VAC
VAC
HEAT PUMP
R
C
Y1
Y2
O
W1
R
G
W1
W2
C
DS