Submittal Sheet

ManualsBrandsHoneywell ManualsHVAC Controls1.5 psi to 5 psi Manual Reset Pressure Switch (Subtractive)

Table Of Contents

PRODUCT DATA

68-0286

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.

Contents

Application ........................................................................ 1

Features ........................................................................... 1

Specifications ................................................................... 2

Ordering Information ........................................................ 2

Installation ........................................................................ 4

Wiring ............................................................................... 5

Setting and Checkout ....................................................... 5

Summary of content (8 pages)

PAGE 1
C437D,E Gas Pressure Switches PRODUCT DATA 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.
PAGE 2
C437D,E GAS PRESSURE SWITCHES SPECIFICATIONS Table 1. Models. Manual Reseta (Locks Out on Switch Break) Switch Action (Response at Setpoint to Pressure Change) Model Number C437D spst, breaks on rise Yes C437E spst, breaks on fall Yes a Designated Manual Reset 2; the trip-free reset mechanism does not permit the switch to function as an automatic-reset device when the manual reset lever is held in the Reset position. Table 2. Switch Ratings (In Amperes).
PAGE 3
C437D,E GAS PRESSURE SWITCHES Maximum Sustained Operating Pressure: See Table 4. Approvals: Underwriters Laboratories Inc. Listed: File No. MP2168, Guide No. MFHX. Canadian Standards Association Certified: File No. LR95329, Certificate No. 1736842. Factory Mutual Approved: Report No. 3024921. Table 4. Maximum Sustained Operating Pressure. Maximum Pressure Pressure Range psi kPa 1/2 to 5-1/2 in. of water 3.0 20.7 1 to 26 in. of water 5.0 34.5 1/2 to 5 psi 15.0 103.4 1 to 10 psi 30.0 206.
PAGE 4
C437D,E GAS PRESSURE SWITCHES INSTALLATION When Installing this Product… 1. 2. 3. 4. Mounting Read these instructions carefully. Failure to follow them could damage the product or cause a hazardous condition. Check the ratings given in the instructions and on the product to make sure the product is suitable for your application. Installer must be a trained, experienced, flame safeguard control technician. After installation is complete, check out product operation as provided in these instructions.
PAGE 5
C437D,E GAS PRESSURE SWITCHES WIRING switch will not be reset until you release the manual reset button. This prevents the switch from becoming an automaticreset device if the reset button is stuck, held in, or tied down. WARNING Electrical Shock Hazard. Can cause severe injury, death or property damage. Disconnect all power to the pressure switch before connecting wiring to prevent electrical shock and equipment damage. All wiring must comply with local electrical codes, ordinances, and regulations.
PAGE 6
C437D,E GAS PRESSURE SWITCHES Completing the Installation 1. 2. 3. 4. Remove the pressure gauge or manometer used for testing. Visually recheck the piping, wiring, and setting. Replace the cover glass and retainers. Return the system pressure to normal. Push the manual reset button (C437D,E only). Installing a Pressure Orifice (Fig.
PAGE 7
C437D,E GAS PRESSURE SWITCHES 7 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 M.S.