Mercoid 1000 Serie Instrucciones De Montage

This control is operated by a negative-rate Bellville spring-
augmented diaphragm.
Location and Mounting
Select a location recommended by the equipment manu-
facturer. Use the four (4) lugs on the case to mount the
control on a panel or smooth wall surface, or mount direct-
ly by the pressure connection.
The control is not position-sensitive and may be mounted
in any position. However, vertical is preferred when there is
a possibility of sludge accumulation or condensed water
freezing in the pressure chamber.
Pressure Connection
The pressure connection is a standard female 1/4" NPT
taper pipe thread. Teflon
material should be used to assure a pressure-tight joint.
Wiring
A 3/4" conduit connection is provided for wiring. Wire in
accordance with local electrical codes or equipment man-
ufacturer's instructions. Use a short piece of BX between
rigid conduit and control so that control will not be subject
to the stress of conduit expansion and contraction.
Electrical ratings are shown on the label.
DO NOT OVERLOAD
Setting Operating Point
Remove the transparent cover over the adjusting wheel.
Move the wheel by hand to the desired pressure on the ver-
tical scale. If the adjusting wheel is difficult to move, a small
screwdriver inserted in the adjusting wheel arms will provide
extra leverage. A stop is provided at the top and bottom of
the scale to prevent setting beyond the control's range.
Dial markings are for the High operating point. Switch will
reset at a lower pressure. Dial markings are a guide for set-
ting. Actual setting should be checked with a good pres-
sure gage.
Teflon ® is a registered trademark of E.I. du Pont de Nemours and Company.
MERCOID DIVISION
DWYER INSTRUMENTS, INC.
P.O. BOX 258 • MICHIGAN CITY, INDIANA 46361 U.S.A.
Series 1000 Diaphragm Operated Pressure Switches
Installation and Operating Instructions
® tape or other good pipe joint
2.725
[69.22]
1.913
1.725
[48.59]
[43.82]
Ø.265
[6.73]
ADJUSTING
WHEEL
2.687
[68.25]
1.350
1/4 NPT
[34.29]
PHYSICAL DATA
Maximum Temperature: 170°F (76°C).
Pressure Connections: 1/4" NPT(F)
Electrical Rating: See Chart on back.
Wiring Connections: 3-screw type; N.O., N.C. and
Common.
Set Point Adjustment: Internal thumbwheel with visible
scale.
Housing: Die-cast, copper-free aluminum, weather-proof.
Diaphragm: Polyimide, Teflon
Calibration Spring: Plated Steel.
Mounting: 4 Holes to accept 1/4" bolts.
Weight: 3 lbs. (1.4 kg)
Installation: Any position.
Note: When used on steam, a pigtail siphon and Type 3
(Teflon ® ) diaphragm should be used. Maximum case ambi-
ent temperature: 170° F (76.7° C).
Warning: A failure resulting in injury or damage may be
caused by over-pressures, excessive vibration or pressure
pulsation, excessive temperature, corrosion of pressure-
containing parts and movement assembly, electrical over-
load or other misuse.
Phone: 219/879-8000
Fax: 219/872-9057
Lit-by-Fax: 888/891-4963
Bulletin IN-1001
3/4 NPT CONDUIT
5.000 [127.00]
CONNECTION
3.825 [97.16]
.625 [15.88]
3.750
[95.25]
7.269
[184.63]
2.094
[53.19]
4.500
[114.3]
® or 316 Stainless Steel
www.dwyer-inst.com
e-mail: info@dwyer-inst.com