Z400B
APPLICATION NOTES
TYPICAL INTERFACE WITH TORK CONTACTORS
Model 5401 - DPST
To control 120 volt circuits where increased voltage and/or
amperage switching is necessary, close or remote from controller.
Can switch up to 40 amps per pole from 120VAC to 480VAC —
one or two circuits simultaneously. Indoor-outdoor enclosure.
TYPICAL INTERFACE WITH
MOMENTARY CONTACT ADAPTER
Model SMC-3D
Momentary contact adapter 120V input maintained contact
converts to SPDT pulsed (2 seconds) circuits. Pulsed switching
circuit will control 24VAC up to 277VAC.
TYPICAL INTERFACE WITH DAY/NIGHT THERMOSTAT
A typical wiring diagram of how to use the Z400B for night set-back
for heating or night set-up for cooling.
Winter Set-back: Set 2-wire night thermostat at 55°F. When
control is “OFF” temperature will not go below 55°.
When control is “ON” (day hours) day thermostat set at 70° to 72°
will override night thermostat.
Summer Set-up: Night thermostat is usually set at 90° to 95°.
When control turns “ON”, day thermostat will override night setting
and cool to (76° to 78°) day setting.
REMOTE TIMED OVERRIDES
8
TORK MODEL Z400B TERMINAL BLOCK
NO
C
NC
OPEN
CLOSE
C
120 VAC
LINE
NEUTRAL
120 VAC COIL
TORK MODELS 5401 & 5441
OR SUITABLE SUBSTITUTE
LOAD
Electrically-
held contactor
Mechanically-
held contactor
self clearing
120/240V LINE
277/480V
40 AMP/POLE
TORK MODEL Z400B TERMINAL BLOCK
NO
C
NC
POWER
24 VOLTS
LOW VOLTAGE
CONTROL POWER
FROM HVAC UNIT
24 Volts
Two Wire
Night
Thermostat
(Time Switch
Circuit OFF)
Day Thermostat
4-Wire Heat/Cool Thermostat
(Time Switch Circuit ON)
HEAT
COOL
FAN
WHITE
YELLOW
GREEN
RED
TORK MODEL Z400B TERMINAL BLOCK
NC
OPEN
ON
120/240
VAC
SURGE
SUPPRESSOR
LINE
NEUTRAL
120 VAC
TO
CONTACTOR
LINE
OFF
Tork Model SMC-3
CLOSE
24 - 277VAC LINE
COMMON
ON
OFF
REMOTE
MANUAL
STATION
N
LINE
NO
C
TORK DIGITAL TERMINAL BLOCK
NO
C
NC
120V 60HZ
LINE
NEUTRAL
120V
COIL
5401
CONTACTOR
LIGHTING
LOAD
120/240V
277/480V
40 AMPS
PER POLE
TORK DIGITAL TERMINAL BLOCK
NO
C
NC
Load to Security
and Alarm System
Load from Security
and Alarm System
TORK MODEL Z400B TERMINAL BLOCK
1
COMMON
MOMENTARY PUSHBUTTON
2
3
4
