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5
Pump 1
Pump 2
Cool Sta
g
es 1
Cool Sta
g
es 2
Heat Sta
g
es 1
Heat Sta
g
es 2
Transformer 1 Transformer 2
Transformer 3
Processor Input/Output 1 Input/Output 2
Low Volta
g
e
Zone Thermostat
Control Rela
y
s
HOA
INPUT
TYPE
UCS-421
MODE
FLT SEQ
MODE
FLT SEQ
A
B
C
D
MA
V
CH
H3
H4
H5
A
B
C
D
24V
POWER
COMMON
SIGNAL
INPUT
CHAIN
OUTPUT
INPUT
TYPE
UCS-421
MODE
FLT SEQ
MODE
FLT SEQ
A
B
C
D
MA
V
CH
H3
H4
H5
A
B
C
D
24V
POWER
COMMON
SIGNAL
INPUT
CHAIN
OUTPUT
INPUT
TYPE
UCS-421
MODE
FLT SEQ
MODE
FLT SEQ
A
B
C
D
MA
V
CH
H3
H4
H5
A
B
C
D
24V
POWER
COMMON
SIGNAL
INPUT
CHAIN
OUTPUT
INPUT
TYPE
UCS-421
MODE
FLT SEQ
MODE
FLT SEQ
A
B
C
D
MA
V
CH
H3
H4
H5
A
B
C
D
24V
POWER
COMMON
SIGNAL
INPUT
CHAIN
OUTPUT
POWER SWITCH
CONVENIENCE
OUTLET
CONDUIT
PANDUCT®
WIRING DUCT
Fig. 4 — Aquazone™ System Control Panel