Owner's Manual

Important Special Notes
Application: Heat detectors should be used for property
protection. Reliance should not be placed on heat detectors for
Life Safety.
CAUTION: When life safety is involved, smoke detectors
MUST also be used. Detectors must not be painted.
Battery Back-Up: Heat detectors should be electronically
supervised with battery back-up at the panel.
The rate-of-rise mechanism may be subject to reduced
sensitivity over time. Annual testing of the rate-of-rise mecha-
nism is recommended.
Electrical Ratings
6-125 Volts A.C., 3.0 Amps.
6-28 Volts D.C., 1.0 Amps.
125 Volts D.C., 0.3 Amps.
250 Volts D.C., 0.1 Amps.
Listings/Approvals
• Listed by Underwriters Laboratories (UL)
• Factory Mutual Approved (FM)
• California State Fire Marshal Approval (CSFM)
• City of New York (MEA) Listing No. 188-94-E
• Listed by Underwriters’ Laboratories of Canada (ULC)
Effective: November, 2001
Screw Terminals
Model 601 and 621
No Marking
Model 601 (1 circuit)
Model 621 (dua circuit)
Rate-of-Rise and Fixed
Temperature, 135°F (57°C)
Applications: Normal
temperature fluctuations
and ceiling temperatures
not exceeding 100°F (38°C)
Maximum Spacing
Allowance* -
50 x 50 ft. - UL
30 x 30 ft. - FM
Model 602 and 622
Gray Ring
Model 602 (1 circuit)
Model 622 (dual circuit)
Rate-of-Rise and Fixed
Temperature, 200°F (94°C)
Applications: Normal tempe-
rature fluctuations and ceiling
temperatures exceeding 100°F
(38°C) but not 150°F (66°C)
Maximum Spacing
Allowance* -
50 x 50 ft. - UL
30 x 30 ft. - FM
Model 603 and 623
Gray Spot
Model 603 (1 circuit)
Model 623 (dual circuit)
Fixed Temperature only,
135°F (57°C)
Applications: Unusually violent
temperature fluctuations
and ceiling temperatures
not exceeding 100°F (38°C)
Maximum Spacing
Allowance* -
25 x 25 ft. - UL
20 x20 ft. - FM
Model 604 and 624
Gray Ring and Dot
Model 604 (1 circuit)
Model 624 (dual circuit)
Fixed Temperature only,
200°F (94°C)
Applications: Unusually violent
temperature fluctuations and
ceiling temperatures exceeding
100°F (38°C) but not 150°F (66°C)
Maximum Spacing
Allowance* -
15 x 15 ft. - UL
*Refer to National Fire Alarm Code Standard NFPA 72 for application requirements
All rights reserved (11/01).
This literature is provided for informational purposes only. CHEMETRONICS assumes no responsibility for the product’s suitability for a
particular application. The product must be properly applied to work correctly. If you need more information on this product, or if you have a
particular problem or question, contact CHEMETRONICS, Ashland, MA; Telephone [phone].
Chemetronics
400 Main Street
Ashland, MA 01721 USA
Phone: [phone]
Fax: [phone]
Website: www.chemetronics.com