The SMZ4-SW Zone System has a built-in safety feature.
At least one zone damper switch must be in the open posi-
tion for the "fan on" switch on the master thermostat to
be operational. If all switches are set to "closed" (c), the
constant fan circuit is disabled. This safety feature removes
the possibility that the air handler could be damaged due to
cavitation, or by a restricted air distribution system.
O
C
Damper is closed
when zone is satisfied.
SMZ Gas/Electric Jumper
Your SMZ panel includes a jumper block labeled JP1. The
purpose of this jumper is to configure the operation of the
fan for normal gas /oil heating equipment or for electric
heating equipment.
When Placed in the "G" position (default) the fan is con-
trolled by the equipment in the heat mode (conventional
operation).
When Placed in the "E" position the fan will come on immedi-
ately with the call for heating (electric heat operation).
Fan Control Center
Heating & Cooling Control
C
Common
R
Hot
W
Heating
Y
Compressor
G
Fan
PT40
24 VAC\40 VA Transformer part # 35054
120 VAC
24 VAC
B
3WT
R
O
Thermostat
Part# 35052
With MSSB
G
W
Sub-Base
Y
Part# 35214
DuroZone
Motor Terminals
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DuroZone
SMZ4-SW WIRING INSTRUCTIONS PAGE 2
O
C
Damper is open
when zone is satisfied.
DuroZone SMZ4-SW Wiring Diagram
Fan
Relay
Equipment
C
R
W
Y
O
G
1
C
2
Zone 1
R
O
B
O
C
W
Y
G
1
O
2
4
C
O
C
DuroZone SMZ4-SW
JP1
G
G
ORDERING INFORMATION
Duro Zone's SMZ Panels can be ordered either as 2, 3 or
4 zone systems.
35214: MSSB Sub-Base - 1 Switchable Sub-Base for use
with Duro Zone's 3WT Thermostat (35052).
35226: SMZ-2 SW - 1 SMZ-SW Panel configured for two
zones.
35227: SMZ-3 SW - 1 SMZ-SW Panel configured for
three zones.
35228: SMZ-4 SW - 1 SMZ-SW Panel configured for
four zones.
NOTE: End user must provide a switchable heat/cool
thermostat with B & O terminals for use in Zone 1,
such as Duro Zone's MSSB, (item #35214). Ther-
mostats such as Honeywell's T87F/Q539A are also
compatible.
JP1
Equipment
CAC
Relay
Relay
G
Zone 2
W
R
Y
Zone 1
1
Relay
2
4
Zone 3
W
Zone 2
R
Relay
Y
1
2
4
Zone 3
Relay
Zone 4
W
R
Y
1
Zone 4
2
Relay
4
Gas Mode - Normal
E
operations. (Default Settings)
Electric Mode - Fan
E
comes on immediately with heat call.
E
3 WT Room Thermostat
Part# 35052
5(R)
4(W)
6(Y)
3 WT Room Thermostat
5(R)
4(W)
6(Y)
3 WT Room Thermostat
5(R)
4(W)
6(Y)
DuroZone
Motor Terminals
1 2 3 4 5
DuroZone
Motor Terminals
1 2 3 4 5
DuroZone
Motor Terminals
1 2 3 4 5
