2
DDT40 Adaptive Defrost Control
DDT40
FIG. 1
DDT40 with Enclosure
FIG. 2
Bracket Mount
(Salable item DT-B. See DT-B Installation Instructions.)
Specifications
Operating Voltages
• 120–240 VAC, 60 Hz
Maximum Loads:
Defrost Heater Load:
• 120 VAC: 4800 W
• 240 VAC: 9600 W
Fan and Compressor Load:
• 120 VAC: 1 HP
• 240 VAC: 2 HP
Fan Load on Terminal F:
• 120 VAC: 1 HP
• 240 VAC: 2 HP
Maximum Contact Ratings:
[1] & [3] Contacts:
• 40 A Resistive
• 1 HP @ 120 VAC
• 2 HP @ 240 VAC
[2] & [4] Contacts:
• 40 A Resistive
• 1 HP @ 120 VAC
• 2 HP @ 240 VAC
[1] & [F] Contacts:
• 40 A Resistive
• 1 HP @ 120 VAC
• 2 HP @ 240 VAC
Mounting:
• Enclosure: Type 3R rainproof indoor/outdoor plastic
Wiring Connections:
Note:
Refer to WARNINGS on page 1 before proceeding.
• Screw clamp terminals: #22 AWG to #8 AWG wire
• Use #8 AWG wire with 90° C rating for 40 A loads
• Use #10 AWG wire with 90° C rating for 30 A loads
Environmental Ratings:
• Operating temperature: -40° F to 130° F
(-40° C to 55° C)
• Operating humidity: 0-95% RH non-condensing
Thermistor Probe Ratings:
• Thermistor*: Type NTC
• Rating: 10 K Ω @ 25° C
• Wire Size: 24 AWG
• Working Range: -40° F to 152° F (-40° C to 67° C)
• Thermistor probe wire length: 10 ft (3.05 m)
• Connector wire length: 6 ft (1.83 m)
*Thermistor probe connection are not an isolated Class 2
circuit.
*Only use thermistor probe specified for use with DDFM
model.
Agency Approval:
• UL Listed
INSTALLATION
Note:
Refer to WARNINGS on page 1 before proceeding.
Tools Required
• Needle nose pliers
• Small flathead or #4-40 TORX™ head screwdriver
• Wire cutter
• Wire stripper
• Emery cloth or evaporator cleaner
• Insulation tape, hose clamp, or wire ties (possibly
needed)
• Fish tape (possibly needed)
