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SMZ4-SW INSTALLATION INSTRUCTIONS
Congratulations on purchasing a Duro Zone SMZ Control
System. The SMZ Panel together with Duro Zone Multiline
Dampers will provide year round comfort for your customer.
Following are simple step-by-step installation instructions and
wiring diagrams for the SMZ System.
For your convenience, your SMZ System is shipped "knocked
down". Do not mount circuit board to box before attaching
box to wall or the mounting holes will be inaccessible.
1 - Mount the panel box to any flat surface.
2 - Mount the circuit board to the panel box with the
nylon standoffs provided.
3 - Strip the wires and attach them to their respective
terminals.
4 - Snap the cover onto the panel box.
ZONE 1
The lower left terminal strip is for Zone 1. The Zone 1
Thermostat must have a heat/cool fan on/auto switchable
sub-base with B & O Terminals. Duro Zone's MSSB Sub-
Base, Part #35214, with a Duro Zone 3WT Thermostat,
Part #35052, is recommended.
FROM TOP TO BOTTOM:
SMZ Terminal "R" goes to "R" on Zone 1 Thermostat.
SMZ Terminal "B" goes to "B" on Zone 1 Thermostat.
SMZ Terminal "O" goes to "O" on Zone 1 Thermostat.
SMZ Terminal "W" goes to "W" on Zone 1 Thermostat.
SMZ Terminal "Y" goes to "Y" on Zone 1 Thermostat.
SMZ Terminal "G" goes to "G" on Zone 1 Thermostat.
SMZ Terminal 1 goes to Terminal 1 of Zone 1 Damper Motor.
SMZ Terminal 2 goes to Terminal 2 of Zone 1 Damper Motor.
SMZ Terminal 4 goes to Terminal 4 of Zone 1 Damper Motor.
SMZ4-SW OPERATION
The SMZ is a simple zoning system incorporating individual
thermostats and zone dampers to provide comfort and
economy. The Zone One Thermostat has a Sub-Base which
acts as the master control to determine if heating or cooling
is desired and if the fan should be on constantly or just when
the equipment calls. When all zones are satisfied, each zone
damper will be in the position set by the Damper Switch,
(see below). If any zone calls, that damper will open, or
remain open, and all others will close. Should another zone
call, its corresponding damper will open. Upon satisfaction
of the zone (s) all dampers will return to the position set
with the Damper Switch, (see below).
With a call in the heat mode, "R" makes to "W" in the
equipment section, activating the furnace relay. The fan will
be controlled by the fan limit switch in the furnace.
DuroZone
SMZ4-SW WIRING INSTRUCTIONS PAGE 1
WIRING
Your SMZ Panel has 5 distinct terminal strips for wiring. One
is for the equipment and one is for each zone thermostat and
damper. Simply follow the instructions below using the wiring
diagram included for reference.
EQUIPMENT
The upper left terminal strip is for wiring the equipment to
the SMZ Panel.
FROM TOP TO BOTTOM:
Terminal "C" goes to the "C" or common side of the
equipment transformer.
Terminal "R" goes to the "R" or hot side of the equipment
transformer
Terminal "W" goes to the furnace relay (W).
Terminal "Y" goes to the compressor relay (Y).
Terminal "G" goes to the fan relay (G).
Terminals 1 and 2 go to a separate 24-volt transformer
used to power the Duro Zone Dampers.
Duro Zone's PT-40, 24-volt 40VA transformer, (Part
#35054), is recommended.
ZONE 2,3&4
The upper right terminal strip is for Zone 2. The middle right
terminal strip is for Zone 3. The lower right SMZ terminal
strip is for Zone 4.
FROM TOP TO BOTTOM:
SMZ Terminal W goes to Terminal "4" (W) of 3WT Ther-
mostat.
SMZ Terminal R goes to Terminal "5" (R) of 3WT Ther-
mostat.
SMZ Terminal Y goes to Terminal "6" (Y) of 3WT Ther-
mostat.
NOTE:
If using a Thermostat other than a Duro Zone 3WT Part
#35052, Terminal W corresponds to "W", Terminal "R"
corresponds to "R", and Terminal "Y" corresponds to "Y".
Second-source thermostats must be three-wire, non-switchable,
sub-base configuration.
SMZ Terminal 1 goes to Terminal 1 of Zone Damper Motor.
SMZ Terminal 2 goes to Terminal 2 of Zone Damper Motor.
SMZ Terminal 4 goes to Terminal 4 of Zone Damper Motor.
With a call in the cool mode, "R" makes to "Y" activating the
Compressor and "R" makes to "G", activating the fan.
When the fan switch on the Zone One Sub-Base is in the "on"
position, "R" makes to "G" and the fan provides constant air
circulation.
NOTE: If all damper switches are set in "closed",
"(C)" position, the fan will not operate in the "Fan
On" position.
DAMPER SWITCHES
The SMZ4-SW Zone System is equipped with individual zone
damper control switches. These switches are located to the left
of the zone relays; one switch per zone. These switches will
allow a zone damper to remain in either the open or closed
position when the system board is at rest. The SMZ4-SW al-
lows the installer or home owner to choose the position of his
system's dampers, to inhibit migration of air into spaces not
desire, for seasonal purposes, or when a zone is not in use.
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