
90300 Temperature Limit Control
Specs At A Glance
Temperature Limit (ºF) 100-180 8 Differential
High Limit 200 10 differential
Power Input (VAC) 120
- 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
Locked Rotor: 120 vac, 60 Amps
Wires
Quantity: 3
120 vac Hot/Neutral: Red-white/White
Limits Out: Black
120 vac Hot/Neutral: Red-white/White
Limits Out: Black
Adjustable Operating Limit Range
Any range between 50ºF to 240ºF
Fixed High Limit Temperature
Any value from 160ºF to 240ºF
Fixed Differential (Subtractive)
Any value from 5ºF to 100ºF
Operating Temperature Limits
+32ºF to +140ºF
Storage Temperature Limits
-40ºF to +185ºF
Agencies
UL & ULC Listed or Recognized Component (US & Canada)

Description
Bock Commercial Recommended Temperature Range Service Pak - Dual limit (operating limit and manual reset high limit) for direct fired commercial storage water heaters (and similar applications). Includes temperature control, sensor and mounting hardware. Replacement for Carlin Model 90100BL1S. UL Recognized.


