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60-2159—8
2
C645A-E PRESSURE SWITCHES
SPECIFICATIONS
Models:
C645A,C,D Pressure Switches—break a circuit when
pressure falls to scale setting minus the differential.
Refer to Table 1.
ORDERING INFORMATION
When purchasing replacement and modernization products from your TRADELINE® wholesaler or your distributor, refer to the
TRADELINE® catalog or price sheets for complete ordering number, or specify—
1. Order number. 3. Optional specifications.
2. Air or gas control on C645A,B models. 4. Accessories, if desired.
If you have additional questions, need further information, or would like to comment on our products or services please write or phone:
1. Your local Honeywell Home and Building Control Sales Office (check white pages of your phone directory).
2. Honeywell Home and Building Control Customer Relations
Honeywell, 1885 Douglas Drive North
Minneapolis, Minnesota 55422-4386
In Canada—Honeywell Limited/Honeywell Limitée, 35 Dynamic Drive, Scarborough, Ontario M1V 4Z9. International sales and
service offices in all principal cities of the world. Manufacturing in Australia, Canada, Finland, France, Germany, Japan, Mexico,
Netherlands, Spain, Taiwan, United Kingdom, U.S.A.
C645B Pressure Switches—break a circuit when pressure
rises to scale setting. Refer to Table 1.
C645E—breaks circuit when pressure falls to scale setting
minus the differential. Refer to Table 1.
Table 1. Pressure switch model selection.
a
Locks out when pressure falls to setpoint minus differential; can be reset manually after pressure rises to setpoint.
b
Locks out when pressure rises to setpoint; can be manually reset after pressure falls to setpoint minus differential.
c
Without indicator on Auto Recycle; with indicator on Lockout model.
d
With surge orifice.
Switch Ratings (Amperes):
Model 120 Vac 240 Vac
C645A Full Load 7.4 3.7
C645B Locked Rotor 44.4 22.2
C645D
C645C Full Load 8.0 5.1
Locked Rotor 48.0 30.6
C645E Full Load 7.4 3.7
Locked Rotor 44.4 22.2
All models also rated 2A at 30 Vac.
Alternate Electrical Ratings when used with Honeywell
Flame Safeguard Programmers (all C645 models):
Ignition
Transformer
540 VA
Pilot Valve 50
Main Valve 250 VA with 10 times inrush.
400 VA with 2-1/2 times inrush.
Scale
Range
Scale
Range
Natural
or LP
Switching
Switch
Position
Differential
Range
(in. wc)
Differential
Range
(kPa)
Maximum
Surge
Pressure
Maximum
Surge
Pressure Cover
Models (in. wc) (kPa) Gas Air Action Indicator
Nom. Max. Nom. Max.
(psi) (kPa) Window
C645A 3 to 21 0.7 to
5.2
Yes Yes Auto Recycle
or Lockout
a
Optional 1 3 0.2 0.7 5 34.5 Optional
5 to 35 1.2 to
8.7
Yes Yes
c
1 4 0.2 1.0 5 34.5 Yes
C645B 3 to 21 0.7 to
5.2
Yes Yes Lockout
b
Yes 1 3 0.2 0.7 5 34.5 Optional
5 to 35 1.2 to
8.7
Yes Yes Yes 1 4 0.2 1.0 5 34.5 Yes
C645C 0.6 to
5.3
0.1 to
1.3
No Yes Auto Recycle
or Lockout
a
Optional 0.2 0.8 0.05 0.02 1.5 10.3 No
2 to 20
d
0.5 to 5 No Yes Auto Recycle No 1 3 0.2 0.7 5 34.5 No
C645D 3 to 21 0.7 to
5.2
No Yes Auto Recycle No 1 3 0.2 0.7 5 34.5 No
C645E 3 to 21 0.7 to
5.2
No Yes Auto Recycle No 1 3 0.2 0.7 5 34.5 No