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The following check-out procedure requires a voltmeter set to read 24 volts A.C..
If, after the check-out procedure is completed, the SMZ panel and dampers are operating correctly, but the system is not
functioning properly, check your wiring carefully. The most common problems experienced are a misplaced wire, a bad con-
nection or a broken wire. If none of these seem to be the problem, check your thermostats and equipment. YOU MUST
PERFORM THE FOLLOWING TEST PROCEDURES IN THE ORDER SHOWN. DO NOT SKIP ANY OF THESE
STEPS. PLACE ALL DAMPER SWITCHES IN "O" (OPEN) POSITION.
1.
You must have 24 volts across R & C of the SMZ Panel Equipment Terminal Strip. (This powers the SMZ panel and
your equipment).
2.
You must have 24 volts across 1 & 2 of the SMZ Panel Equipment Terminal Strip, and every 1 & 2 of each SMZ Panel
Zone terminal. (This powers the dampers).
3.
To test the operation of the SMZ panel, you must disconnect all thermostats. With the thermostats disconnected, and
24 volts as described in #2 above, all dampers should be open. (If the dampers are not open, go to step 4).
3A. To test the heat mode, connect R & B at the SMZ Panel Zone 1 Terminal Strip. (This sets the panel to heat). Zone 1
will be activated when you jump R & W at the SMZ Zone 1 panel terminal strip. (All zone dampers, except Zone 1 will
close and the furnace will turn on). Zone 2, 3 or 4 can be activated by jumping R & W at the corresponding SMZ Zone
2, Zone 3 or Zone 4 Terminal Strips. If the furnace does not activate, with R & B connected and R & W (or R & W
of Zone 2, Zone 3 or Zone 4) jumped, test for 24 volts across C & W at the SMZ Panel Equipment Terminal Strip. If
voltage reading is 24 volts, panel is okay.
3B. To test the cool mode, disconnect the R & B connection made for the heat mode check. Connect R & O at the SMZ
Panel Zone 1 Terminal Strip. (This sets the panel to cool). Zone 1 will be activated when you jump R & Y at the SMZ
Panel Zone 1 Terminal Strip. (All zone dampers except zone 1 will close, and the air conditioning will come on.) zones
2, 3 or 4 can be activated by jumping R & Y at the SMZ
conditioning does not activate with R & O connected and R & Y (or R & Y of Zone 2, Zone 3, or Zone 4) jumped,
test for 24 volts across C & Y at the SMZ Panel Equipment Terminal Strip. If voltage reading is 24 volts, control panel
is okay.
3C. To test the Fan, jump R & G at the SMZ Panel Zone 1 Terminal Strip. Be sure at least one Damper Switch is in "open"
"(O)" position. The fan should activate. If the fan does not activate, with R & G jumped, test for 24 volts across C &
G at the SMZ Panel Equipment Terminal Strip. If voltage reading is 24, panel is okay.
4.
To test the damper operation, perform step #3A, checking for 24 volts across 1 & 4 of every SMZ Panel Zone Termi-
nal Strip when that zone is activated, and for "O" volts at 1 & 4 of every SMZ Panel Zone Terminal Strip that is not
activated. (IMPORTANT: This test will work only if at least one zone is activated. If no zone is activated, all terminal 1
& 4 readings will be 24 volts.) If all readings are correct, the panel is operating correctly. If a damper is not functioning
but the SMZ Panel has checked out okay, check for 24 volts across terminals 1 & 2 on the damper motor. If you have
24 volts, disconnect the terminal 4 connection to the damper. Jumping terminals 4 & 5 on the damper motor should
make the damper open. (It will take 30 to 60 seconds for a damper to fully open.) When you disconnect the jumper
from terminals 4 & 5, the damper should close. If the damper tested does not operate as described, the problem could
either be binding damper linkage, the blade movement is being obstructed, or you could have either an incorrect or a
defective motor. (With multiblade dampers, it is possible to connect the motor to the linkage 180 "out of phase", which
causes the damper to be open when it should be closed, and closed when it should be open).
DuroZone
SMZ4-SW WIRING INSTRUCTIONS PAGE 3
SMZ4-SW SYSTEM CHECKOUT PROCEDURE
Zone 2, Zone 3 or Zone 4 Terminal Strips. If the air
©2007 Duro Dyne Corporation
Printed in USA 10/2007
BI035410
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