90300 Dual Limit Temperature Control

With Sensor Redundancy
Operation & High Limit

• Multiple sensor option (3) (Using individual and/or dual sensor assemblies)
• Sensor Redundancy (Higher temperature of two operating sensors used)
• Easy remote sense (Manual reset only if operating limit doesn’t open)
• Smart manual reset (Manual reset only if operating limit doesn’t open)
• Serviceman reset protection (Latch-up after three consecutive lockouts) Latch-up mode shuts down the control after three consecutive lockouts and requires a special procedure to reset. This ensures the owner will call in a licensed technician to troubleshoot and correct burner problems.
• Power-independent lockout (Power cycling won’t reset from lcokout or latch-up)
• Diagnostic LED’s (Power, call for heat, and lockout/latchup)
• SMC Technology (Safety Monitoring Circuit) Provides two limit relays. Carlin’s Safety Monitoring Circuit monitors the contacts for both relays. Lockout occures if a limit relay contact is found closed when it should be open.)

Model
90300B
Dual Limit Temperature Control

Operating and high limit action

Smart manual reset on high limit

Operating limit sensors, redundant

High limit sensor

Operating and limit contacts in series

Power
Input

(Red-White Wire)

120
vac, 11 VA
Contacts
2 in Series
Contact
Rating
Full Load: 120 vac, 10 Amps

Locked Rotor: 120 vac, 60 Amps

Wires
Quantity:
3
120 vac Hot/Neutral: Red-white/WhiteLimits Out: Black
Adjustable
Operating Limit Range
Any
range between 50°F to 240°F
Fixed High Limit Temperature
Any value from 160°F to 240°F
Fixed
Differential (Subtractive)
Any
value from 5°F to 100°F
Operating
Temperature Limits
+32°F
to +140°F
Storage
Temperature Limits
-40°F
to +185°F
Wiring
Diagram
Agencies
UL
& ULC Listed or Recognized Component (US & Canada)