Ashcroft T400, T700 Schematics

Page 1
Installation and Maintenance Instructions for
3
.32
(84)
3.26 (83)
0.28 (7) X 3 HOLES
4.03 (102)
Ø2.31 (59)
4.61
(
117)
2.31
ACTIVE BULB
L
ENGTH
(59)
2.77 (70)
2.27 (58)
1.25 (32)
0.25 (
6)
3
.00
(76)
Ø0.37
(9)
“L”
2.50 (64)
2.00 (51)
3/4 NPT
Ø
0.22 (6)
3
.32
(84)
3
.26 (83)
Ø 0.28 (7) X 3 HOLES
4.03 (102)
Ø
2.31 (59)
4.61
(117)
2
.77
(70)
2.27 (
58)
1.25 (32)
0.25 (6)
Ø0.37
(9)
2.00 (
51)
1.31 (
33)
2
.31
ACTIVE BULB
LENGTH
(59)
“S”
3
/4 NPT
1
/2 NPT MALE
7
/8 HEX
5.20
(
132)
3.61 (92)
2.18 (
55)
0
.32 (8)
4
.37
(111)
1.37 (35)
Ø
0.28 x 3 HOLES (7)
2
.31
(59)
5.23
(133)
1.93 (49)
2.31
ACTIVE BULB
LENGTH
(59)
Ø3.90
(
99)
0.03 (1)
3.58 (
91)
1.22 (31)
2.50 (64)
“L”
3.00 (
76)
Ø0.37
(9)
3/4 NPT 2 HOLES
5
.20
(132)
3.60 (91)
2.18 (55)
4.37
(111)
1.37 (35)
Ø 0.28 x 3 HOLES
(7)
1.93 (49)
0.32 (8)
5.23
(133)
2.31 (59)
Ø3.90
(99)
0.03 (1)
3.58 (91)
0.31 (8)
1
.22
(
31)
0.37 (9)
2.31
ACTIVE BULB
(59)
1.31 (
33)
“S”
1/2 NPT MALE
3/4 NPT 2 HOLES
7/8 HEX
LENGTH
T400 & T700 ASHCROFT®Snap Action Switches for Temperature Control
400 REMOTE MOUNT
T
400 DIRECT MOUNT
T
3.5 lbs.
700 REMOTE MOUNT
T
4.5 lbs.
2.5 lbs.
700 DIRECT MOUNT
T
3.7 lbs.
STEM LENGTH – INCHES
S 2.75 4.0 6.0 9.0 12.0
LINE LENGTH – FEET
L 5.0 10.0 15.0 20.0 25.0
INTRODUCTION
The Ashcroft
®
temperature switch is a precision built U.L. and C.S.A. approved control device which features a mechanical snap action switch. Controllers are available for operation on temperature with fixed or variable differential. Also, manual reset types are available for operation on increasing or decreasing temperature. The manual reset types remain tripped until reset by pressing a button on the top of the enclosure. The standard electrical switch is SPDT and is available with various electrical characteristics. Two SPDT switch elements mounted together are available except on variable deadband and manual reset types. Bulb material is stainless steel.
The Ashcroft snap action temperature switch is furnished in the standard NEMA 4/4X and explosion proof NEMA 7 and 9 enclo­sure styles. Both enclosures are epoxy coated aluminum castings.
© 2017 Ashcroft Inc., 250 East Main Street, Stratford, CT 06614-5145, USA, Tel: 203-378-8281, Fax: 203-385-0499, www.ashcroft.com All sales subject to standard terms and conditions of sale. I&M009-10006-10/00 (250-2230G) 12/17
INSTALLATION
These controls are precision instruments and should never be left with internal components exposed. During installation insure that covers are in place and conduit openings are closed except when actually working on the control. Good piping practice re­quires the use of a thermowell for installation where pressure may be applied to the thermal system. The thermowell provides protection against physical damage as well as corrosive effects of media flow. Use of a thermowell also facilitates removal of the bulb from the process line without disturbing the process. Stan­dard thermowell materials include brass, steel and stainless steel; other materials are available upon request. Selection should be based on corrosion resistance requirements and process pressure.
Page 2
Installation and Maintenance Instructions for
TERMINAL BLOCK F
RONT SWITCH
TERMINAL BLOCK R
EAR SWITCH
NC
NO
C
N
C
N
O
C
T400 & T700 ASHCROFT®Snap Action Switches for Temperature Control
MOUNTING T400 AND T700 SERIES
There are three holes external to the enclosure for surface
ounting. Location of these holes is shown on the general di-
m mension drawing.
A. Direct - Mounted Controls
These controls have a
1
2 NPT threaded adapter and may be at-
tached directly or indirectly by means of a thermowell to equip­ment to be controlled. When installing or removing control
always use the wrench flats or hex above the threads. Do not twist the housing.
B. Remote Mounted Controls
Two types of union bushings are available to install a remote mounted bulb into a thermowell or other
1
2 NPT threaded hole.
A non-pressure tight type consists of a bushing, split grommet and compression nut. To use this, the bulb is inserted through the nut and the split grommet is slipped into the capillary be­tween the compression nut and the bushing. After positioning the bulb as desired tighten the nut to the bushing. This will lock the capillary at the desired location. The pressure tight type is clamped to the bulb after insertion by tightening the compression
2-SPDT – Dual switching elements consist of two SPDT switches
ounted together in a bracket. Switches are calibrated to have
m simultaneous operation within 1% of range either on increasing or decreasing pressure but not in both directions. Wire directly to the front and rear switch according to circuit requirements. Leads are provided on rear switch color coded as follows: Common – White Normally Closed – Red Normally Open – Blue
hen hermetically sealed switch element (s) are supplied, the
W lead color coding is as follows: Common – White Normally Closed – Red Normally Open – Blue
T700 SERIES SPDT – Wire directly to the switch according to circuit
requirements.
2-SPDT – Wire to front switch terminal block (left) and rear switch terminal block (right) as marked. Strip insulation
5
16˝,
insert in proper terminal connector and tighten clamping screw to secure.
SETPOINT LOCKING SCREW (T400 ONLY)
Once setpoint has been determined, tighten setpoint locking
screw using a
5
/64˝ allen (hex) wrench. Do not over torque;
setpoint locking screw only needs to be hand tight.
When performing calibration or changing the setpoint, the setpoint locking screw should be loosened before turning the setpoint adjusting nut. Once calibration is complete, re-tighten the set­point locking screw.
nut. To use this, the union bushing is screwed into the
1
2 NPT threaded hole.
The compression nut and sleeve are slipped onto the bulb which is then inserted into the union bushing. The bulb is then positioned and the compression nut is hand tightened pus 2
1
4 turns. This will lock the capillary at the
desired location.
ELECTRICAL CONNECTIONS
Remove cover
T400 Series – two screws hold cover to enclosure T700 Series – cover unscrews
CONDUIT CONNECTIONS Note – It is recommended that Teflon
®
tape or other sealant be
Setpoint Locking Screw
used on conduit, bushing or plug threads to ensure integrity of the enclosure.
T400 Series standard – one T700 Series standard – two
manent plug. NEMA 7 & 9 enclosures require proper conduit seals and breathers as per the National Electrical Code. T400 & T700 series – XJL variation – bushing supplied.
T400 Series – XJK variation – two
T400 SERIES SPDT – Wire directly to the switch according to circuit require-
ments. On controls with pilot lights wire lights according to circuit
3
4 NPT conduit hole right side.
3
4 NPT conduit holes with one per-
3
1
4 to
2 NPT reducing
3
4 NPT conduit holes.
After installation of the control replace cover to insure electrical
safety and to protect internal parts from the environment.
ADJUSTMENT OF SETPOINT
T400 & T700 Series – A single setpoint adjustment nut (
7
8˝) is
located centrally at the bottom on the inside of the enclosure.
The bulb of the control should be immersed in a bath at the desired setpoint temperature. Optimum performance will be obtained if the bulb is fully immersed. Allow five minutes for initial stabilization.
diagram on inside of cover. See special wiring instruction tag for single switches with two pilot lights and dual switches with one or more lights.
© 2017 Ashcroft Inc., 250 East Main Street, Stratford, CT 06614-5145, USA, Tel: 203-378-8281, Fax: 203-385-0499, www.ashcroft.com All sales subject to standard terms and conditions of sale. I&M009-10006-10/00 (250-2230G) 12/17
Page 3
Installation and Maintenance Instructions for T400 & T700 ASHCROFT®Snap Action Switches for Temperature Control
As received, the temperature switch will normally be set to pproximately 90% of the indicated range. After stabilization,
a turn the adjustment nut until switch changes mode. Direction of turning is indicated on a label affixed to the inside of the control enclosure. When setpoint has been achieved raise and lower temperature to insure that the setpoint is correct. After installation of the control replace cover to insure electrical safety and to protect internal parts from the environment.
T450 and T750 VARIABLE DEADBAND SWITCHES
eadband is varied by rotating the wheel on the precision switch.
D When viewed from the front of the enclosure, rotation to the left increases deadband – rotation to the right decreased deadband. Letters on the wheel may be used as a reference. Deadbands obtainable will vary from 0.5% to 9% of pressure range depending on range segment.
ADJUSTMENT OF SETPOINT
As received, the temperature switch will normally be set to approximately 90% of range. Rotate the wheel on the MICRO SWITCH all the way to the right; this will provide smallest dead­band. Increase bath temperature to the required setpoint and turn the adjustment nut until the switch changes mode. Lower the bath temperature to reset the switch. Rotate the wheel on the MICRO SWITCH until the desired deadband is obtained. The upper setpoint will be changing upward with this adjustment. Lower the bath temperature to reset the switch. Raise the bath temperature to the desired setpoint and turn the adjusting nut until the switch changes mode. Lower the bath temperature and check reset point and deadband.
T428 & T429 MANUAL RESET SWITCHES
Route wire leads from switch terminals so as not to interfere with or touch reset button. Note – As indicated above, adjustment of setpoint is made by
7
use of
8˝ nut. Precision switch element mounting screws and
bracket adjusting screw are factory sealed and should not be tampered with.
© 2017 Ashcroft Inc., 250 East Main Street, Stratford, CT 06614-5145, USA, Tel: 203-378-8281, Fax: 203-385-0499, www.ashcroft.com All sales subject to standard terms and conditions of sale. I&M009-10006-10/00 (250-2230G) 12/17
Page 4
Installation and Maintenance Instructions for T400 & T700 ASHCROFT®Snap Action Switches for Temperature Control
© 2017 Ashcroft Inc., 250 East Main Street, Stratford, CT 06614-5145, USA, Tel: 203-378-8281, Fax: 203-385-0499, www.ashcroft.com All sales subject to standard terms and conditions of sale. I&M009-10006-10/00 (250-2230G) 12/17
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