Honeywell C437D Quick Start Manual page 3

Maximum Sustained Operating Pressure: See Table 4.
Table 4. Maximum Sustained Operating Pressure.
Pressure Range
1/2 to 5-1/2 in. of water
1 to 26 in. of water
1/2 to 5 psi
1 to 10 psi
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).
5/16 (7.9) (4)
5/8
(15.9)
(4)
7-11/16
DIA.
(195.3)
2
45
1/8–27 NPT
1 137755 MOUNTING BRACKET (2), IN 4074BWK BAG ASSEMBLY – OPTIONAL.
2
VENT TAPPING. REMOVE DUST-SEAL LABEL BEFORE MOUNTING.
Fig. 1. Installation dimensions of the C437 gas pressure switches, in in. (mm).
RECYCLE NOTICE
If this control is replacing a control that contains
mercury in a sealed tube, do not place your old control
in the trash.
Maximum Pressure
psi kPa
3.0 20.7
5.0 34.5
15.0 103.4
30.0 206.8
6-1/4 (158.8)
7-3/8 (187.3)
1/2–14 NPT
3
C437D,E GAS PRESSURE SWITCHES
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.
Replacement Parts:
106729 Cover Glass, 6 in. (152.4 mm) diameter.
118733-21 Retaining Clip.
Accessories:
4074BWK Bag Assembly: Contains two 137755 Mounting
Brackets and four self-tapping screws: for surface
mounting. 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.
1
6-1/2
(165.1)
7-3/4
(196.9)
45
TAPPED FOR 1/2 IN.
CONDUIT
Contact your local waste management authority for instructions
regarding recycling and the proper disposal of an old control
containing mercury in a sealed tube.
1/8
(3.2)
1
(25.4)
1-5/16
(33.3)
2 (50.8)
3-7/16 (87.3)
M7192A
68-0286