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C437D,E Gas Pressure Switches
APPLICATION
The C437D,E Gas Pressure Switches are pressure-actuated
switching devices used in industrial gas system applications
for safety shutoff, pressure control, and differential-pressure
control.
All Series 4 models have MicroSwitch™ snap switches to
open or close a circuit on pressure rise or drop.
NOTE: Series numbers immediately follow OS numbers, i.e.,
C437D2003(4).
FEATURES
• C437 models have direct- and reverse-acting (spst)
switching.
• Pressure ranges: 1/2 to 5-1/2 in. of water (0.1 to 1.4
kPa); 1 to 26 in. of water (0.5 to 7 kPa); 1/2 to 5 psi (3 to
35 kPa); 1 to 10 psi (5 to 70 kPa).
• Models intended for lockout applications must be
manually reset before resuming operation.
• Trip-free mechanism on manual reset models ensures
that the limit function of the switch cannot be defeated
by jamming the reset lever.
• External manual reset button on side of lockout
models.
• Enclosed setting impedes tampering and provides
dust-resistant operation.
• Buna-N fiber-reinforced material for increased
strength of control diaphragm.
• Two Buna-N fiber-reinforced seal-off diaphragms for
added reliability.
• Clear glass cover allows observation of interior
mechanism to aid setting and checkout.
• Heavy die-cast case increases durability and
resistance to corrosion.
• Main control diaphragm completely enclosed a leak-
proof chamber can be vented to a safe area.
• Models with a pressure range of 1 to 26 in. of water (0.5
to 7 kPa) have a restrictive orifice in the inlet pressure
channel to compensate for momentary surges in gas
pressure.
• Field-addable orifices of various sizes are available.
Application ........................................................................
Features ...........................................................................
Specifications ...................................................................
Ordering Information ........................................................
Installation ........................................................................
Wiring ...............................................................................
Setting and Checkout .......................................................
PRODUCT DATA
Contents
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1
2
2
4
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68-0286
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Summary of Contents for Honeywell C437D
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Page 1: Table Of Contents
• Clear glass cover allows observation of interior mechanism to aid setting and checkout. • Heavy die-cast case increases durability and The C437D,E Gas Pressure Switches are pressure-actuated resistance to corrosion. switching devices used in industrial gas system applications for safety shutoff, pressure control, and differential-pressure •... -
Page 2: Specifications
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 Automation and Control Products Sales Office (check white pages of your phone directory). 2. Honeywell Customer Care... - Page 3 C437D,E GAS PRESSURE SWITCHES Maximum Sustained Operating Pressure: See Table 4. Approvals: Underwriters Laboratories Inc. Listed: File No. MP2168, Guide Table 4. Maximum Sustained Operating Pressure. No. MFHX. Canadian Standards Association Certified: File No. LR95329, Maximum Pressure Certificate No. 1736842.
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Page 4: Installation
C437D,E GAS PRESSURE SWITCHES INSTALLATION When Installing this Product… Mounting 1. Read these instructions carefully. Failure to follow them 1. Remove the dust-seal label from the vent tapping. could damage the product or cause a hazardous 2. Remove the screws and retainers, and the cover glass. -
Page 5: Wiring
(Fig. 2) clockwise to increase the setpoint and the differential. counterclockwise to decrease it. 3. Push the manual reset button (Fig. 2) on the C437D; the C437D should make contact. Trip-Free Manual Reset Feature (C437D,E C437E (Additive Differential) only) 1. - Page 6 Visually recheck the piping, wiring, and setting. 2. Replace the cover glass and retainers. MAIN PRESSURE TAPPING 3. Return the system pressure to normal. 4. Push the manual reset button (C437D,E only). PRESSURE ORIFICE (SELECTED) Installing a Pressure Orifice (Fig. 5)
- Page 7 C437D,E GAS PRESSURE SWITCHES 68-0286...
- Page 8 C437D,E GAS PRESSURE SWITCHES Automation and Control Solutions Honeywell International Inc. Honeywell Limited-Honeywell Limitée 1985 Douglas Drive North 35 Dynamic Drive Golden Valley, MN 55422 Toronto, Ontario M1V 4Z9 customer.honeywell.com ® U.S. Registered Trademark © 2006 Honeywell International Inc. 68-0286...