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60-2159—8
3
C645A-E PRESSURE SWITCHES
Switching:
Spdt Micro Switch snap-acting switch (Fig. 3).
Minimum Ambient Temperature:
-20°F (- 29°C).
Maximum Ambient Temperature:
125°F (52°C).
Connections:
1/4-18 NPT female tapping for main or high pressure
connection.
1/8-27 NPT female tapping for venting or low-pressure
connection.
Approvals:
Underwriters Laboratories Inc. listed: C645AE File
no. MP2168, Guide no. MFHX; for use in ambient
temperatures normally prevailing in occupiable spaces,
which usually are not higher than 77°F (25°C) but can
occasionally be as high as 104°F (40°C) for brief periods.
Canadian Standards Association listed: C645A-E, File no.
LR1620-369, Guide no. 140-A-2; for use subject to
same ambient temperature restrictions as Underwriters
Laboratories Inc.
Factory Mutual Approved.
Industrial Risk Insurers: C645A-D models with window in
cover approvable for applications on burners over
5 million Btuh (5 thousand cfh) input.
Optional Specifications:
1. C645A with position indicator and manual reset.
2. C645A operation to 1.5 in. WC with position indicator
and manual reset.
3. C645B with position indicator and manual reset.
4. C645C with position indicator and manual reset.
5. C645D with 2 in. (50.8 mm) differential.
Accessories:
1. C645A,B,D: Mounting Bracket: part no. 15865AC.
2. C645C: Mounting Bracket: part no. 112657A.
3. C645A: Cover with Window: part no. 137637B.
4. C645B: Cover with Window: part no. 137637C.
2-7/8 (73)
3-1/2
(88.9)
3/8
(9.5)
1-1/8
(28.6)
4
(101.6)
4-3/4
(120.6)
3-1/2 (88.9)
3/16 (2)
(4.8)
2-1/2 (63.5)
1-5/16
(33.3)
5/8
(15.9)
1/4-18 NPT
1/8-27 NPT
MOUNTING
BRACKET
(OPTIONAL)
M7564
3/8 (9.5)
1
1
IMPORTANT: FOR MODELS WITH LOCKOUT, DO NOT OBSTRUCT MANUAL RESET LEVER.
Fig. 1. Dimensions of C645A,B,D, and E in in. (mm).