Honeywell C437EC437, C637B, C437F, C437G, C437D User Manual

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C437D,E,F,G,H,J,K and C637B Gas

GENERAL

The C437 and C637 Gas Pressure Switches are pressureactuated switching devices used in industrial gas system applications for safety shutoff, pressure control, and differential-pressure control.

Pressure Switches

PRODUCT DATA

FEATURES

• C437 models have direct- and reverse-acting (spst) switching; C637B has single-pole, double-throw (spdt) switching.

• Pressure ranges: 1/2 to 5-1/2 in. of water (10 to 140 mm of water, or 0.1 to 1.4 kPa); 1 to 26 in. of water (50 to 700 mm of water, or 0.5 to 7 kPa); 1/2 to 5 psi (300 to 3500 mm of water, or 3 to 35 kPa); 1 to 10 psi (500 to 7000 mm of water, or 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.

• Mercury switch provides visual indication of switch position.

• Heavy die-cast case increases durability and resistance to corrosion.

• Main control diaphragm completely enclosed a leakproof chamber can be vented to a safe area.

• Models with a pressure range of 1 to 26 in. of water (50 to 700 mm of water, or 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.

• Models available with rainproof, dustproof, sleet- and

ice-resistant enclosure; meets NEMA 3R specification.

Contents

General ............................................................................... 1

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

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

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

Recycling Notice ................................................................. 4

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

Setting and Checkout .......................................................... 6

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C437D,E,F,G,H,J,K AND C637B GAS PRESSURE SWITCHES

SPECIFICATIONS

Models:

Model

Number

(Response at Setpoint to Pressure Change)

Switch Action

Manual Reset

(Locks Out on Switch Break)

C437D spst, breaks on rise yes C437E spst, breaks on fall yes

C437F C437G C437H

2 spst circuitsc, breaks one, makes one no spst, breaks on rise no spst, breaks on fall no

C437J 2 spst circuitsc, breaks one, makes one yes (lockout on rise) C437K 2 spst circuitsc, breaks one, makes one yes (lockout on fall) C637B spst, breaks R-W and makes R-B on fall no

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.

Weatherproof enclosure (NEMA 3R) available.

Two separate switches are contained in the same mercury bulb.

Switch Ratings (In Amperes):

C437E,G and H C437F,J,K

Voltage Full Load Locked Rotor Resistive Load Full Load Locked Rotor Resistive Load

120 Vac 8.0 48.0 10.0 8.0 48.0 10.0 240 Vac 5.1 30.6 5.0 5.1 30.6 5.0 120 Vdc 2.4 24.0 5.0 2.0 20.0 8.0 240 Vdc 1.2 12.0 2.0 1.0 10.0 3.0

C637B—62.5 VA at 120 and 240 Vac, pilot duty.

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.

2. Pressure range.

3. Replacement parts, if desired.

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 Division Sales Office (check white pages of phone directory).

2. Home and Building Control Division Customer Logistics Honeywell Inc., 1985 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.

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C437D,E,F,G,H,J,K AND C637B GAS PRESSURE SWITCHES

Switch:

Mercury switch (C437F,J and K have two spst switches in one mercury bulb).

Differentials:

Fixed, nominal; measured at pressure indicated:

Pressure Range

Model

Numbers

1/2 to 5-1/2 in.

(10-140 mm, or

0.1-1.4 kPa)

Differential Measured

at 1/2 in.

1 to 26 in.

(50-700 mm, or

0.5-7 kPa)

differential

measured at 15 in.

in. mm kPa in. mm kPa psi mm kPa psi mm kPa Type

C437D,J — — — 1-3/4 44.5 0.44 1/2 352 3.45 1c703c6.89cSubtractive C437E,F,H,K 0.25e6.4e0.06e1-1/4 31.8 0.31 1/4 176 1.72 1/2e352e3.45eAdditive C637B 0.15 3.8 0.04 C437G — — — 1-1/4 31.8 0.31 1/4 176 1.72 1/2 352 3.45 Subtractive

in. = inches of water; mm = millimeters of water.

Restrictive orifice in inlet pressure channel to compensate for momentary surges in gas pressure.

Not available for C437J.

Subtractive models: switching action occurs on pressure rise to the setpoint.

Not available for C437K.

Additive models: switching action occurs on pressure fall to the setpoint.

1/2 to 5 psi

(300-3500 mm, or

3-35 kPa) differential

measurement at

midscale

1 to 10 psi

(500-7000 mm,

or 5-70 kPa)

differential

measurement

Pressure Ranges (Scale Range):

Specify one:

1/2 to 5-1/2 inches of water (10 to 140 mm of water, or

0.1 to 1.4 kPa).

1 to 26 inches of water (50 to 700 mm of water, or 0.5 to

7 kPa).

1/2 to 5 lb per sq in. (300 to 3500 mm of water, or 3 to

35 kPa).

1 to 10 lb per sq in. (500 to 7000 mm of water, or 5 to

70 kPa).

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 30.0 206.8

Pipe Connections:

Main or High Pressure: 1/2 in. NPT, female. Vent or Low Pressure: 1/8 in. NPT, female. Electrical Wiring: Hole tapped for 1/2 in. conduit.

Maximum Ambient Temperature:

125°F (52°C).

Minimum Temperature:

32°F (0°C).

Approvals:

Underwriters Laboratories Inc. Listed: File No. MP2168,

Guide No. MFHX.

Canadian Standards Association Certified: File No. 1620,

Guide No. 380-W-1.16.

Factory Mutual Approved: Report No. 13031-S5 and

19291.

Replacement Parts:

106729 Cover Glass, 6 in. (152.4 mm) diameter. 139870A Cover Glass, for rainproof enclosures. 106747 Cover Retaining Ring, for models manufactured

before 1973.

118733-21 Retaining Clip, for models manufactured since

1975.

Accessories:

4074BWK Bag Assembly: Contains two 137755 Mounting

Brackets and four self-tapping screws: for surface mounting (standard on C437G and H). Mounting brackets are shown by dashed lines in Fig. 1.

Field-addable Orifices:

124674: 0.011 in. (0.28 mm) diameter. 122160: 0.018 in. (0.46 mm) diameter.

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