Ashcroft T700 DIRECT MOUNT Instruções de instalação e manutenção - Página 2

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Installation and Maintenance Instructions for

T400 & T700 ASHCROFT

Switches for Temperature Control

There are three holes external to the enclosure for surface

MOUNTING T400 AND T700 SERIES

mounting. Location of these holes is shown on the general di-

mension drawing.

These controls have a

⁄

NPT threaded adapter and may be at-

A. Direct - Mounted Controls

tached directly or indirectly by means of a thermowell to equip-

ment to be controlled. When installing or removing control

always use the wrench flats or hex above the threads. Do

not twist the housing.

Two types of union bushings are available to install a remote

B. Remote Mounted Controls

mounted bulb into a thermowell or other

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 be-

tween 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

nut. To use

this, the union bushing is screwed into the

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

⁄

turns. This will lock the capillary at the

desired location.

Remove cover

ELECTRICAL CONNECTIONS

T400 Series – two screws hold cover to enclosure

T700 Series – cover unscrews

Note – It is recommended that Teflon

CONDUIT CONNECTIONS

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

SPDT – Wire directly to the switch according to circuit require-

T400 SERIES

ments. On controls with pilot lights wire lights according to circuit

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.

All sales subject to standard terms and conditions of sale. I&M009-10006-10/00 (250-2230G) 12/17

Snap Action

⁄

NPT threaded hole.

TERMINAL BLOCK

FRONT SWITCH

TERMINAL BLOCK

REAR SWITCH

⁄

NPT threaded hole.

tape or other sealant be

⁄

NPT conduit hole right side.

⁄

NPT conduit holes with one per-

⁄

NPT reducing

⁄

NPT conduit holes.

2-SPDT – Dual switching elements consist of two SPDT switches

mounted together in a bracket. Switches are calibrated to have

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

When hermetically sealed switch element (s) are supplied, the

lead color coding is as follows:

Common

– White

Normally Closed

– Red

Normally Open

– Blue

SPDT – Wire directly to the switch according to circuit

T700 SERIES

requirements.

2-SPDT – Wire to front switch terminal block (left) and rear

switch terminal block (right) as marked. Strip insulation

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

˝ 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 set-

point locking screw.

After installation of the control replace cover to insure electrical

safety and to protect internal parts from the environment.

T400 & T700 Series – A single setpoint adjustment nut (

ADJUSTMENT OF SETPOINT

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.

⁄

˝,

Setpoint

Locking

Screw

⁄

˝) is