Product Manual

WASH DOWN THERMOSTATS
TPI CORPORATION
PO BOX 4973
JOHNSON CITY, TN 37602
Models HTW155 and HTW255 are the same as the above models except they have a limited temperature adjustment range.
TW255D 2 STAGE HEAT ONE STAGE COOL
MODEL DESCRIPTION
CTW155B HEAT WITH CORD
CTW155C COOL WITH CORD
TW155E HEAT or COOL WITH REMOTE SENSOR
ELECTRICAL RATINGS (CORDED MODELS)
13 AMP @ 125 Vac
58.8 L.R.A. @ 125 Vac
9.8 F.L.A. @ 125 Vac
TW155 / TW255 SERIES
INSTALLATION INSTRUCTIONS
APPLICATION
The TW155 and TW255 thermostats are intended for use in wash down and mildly corrosive atmospheres for control of heating
or cooling equipment.
The TW155 and TW255 are designed for use as operating or regulating controls only. Where control failure could result
in personal injury or loss of property, an approved backup temperature limit control or an advisory alarm system should
be used to warn of control failure.
MODEL DESCRIPTION
TW155(A) HEAT or COOL SPDT
TW255(A) HEAT or COOL DPDT
DESCRIPTION
The TW series thermostats utilize a two piece molded plastic enclosure with all exposed metal hardware being stainless
steel. the thermostat, adjusting knob and sensing coil are attached to the enclosure cover, allowing the box to be mounted
and the wiring to be connected with out damaging the control. Wiring will be at the bottom of the enclosure.
ELECTRICAL RATINGS
22 AMP @ 125/250/277 Vac
3/4 HP @ 125 Vac
1 1/2 HP @ 250/277 Vac
** CAUTION **
Installation must be performed by an experienced, qualified service person
Always disconnect power supply before performing any work.
Wire nut or otherwise insulate any unused conductors.
All wiring must conform to state and local codes.
SAFETY INFORMATION
1. Disconnect all power before installing or servicing.
2. Be certain that the electrical load that is to be controled does not exceed the thermostat rating.
3. This thermostat is intended for permanent installation and must be installed in accordance with the National Electric Code
(NEC) and all state and local codes.
4. Use copper conductors only.
5. This thermostat is rated for wash down applications, and is not to be used in potentially explosive or flammable atmospheres.
6. The TW155 and TW255 thermostats are designed to prevent the entry of dust and water inside the enclosure. If any part of this
assembly is cracked or broken do not install, use or operate as this could result in personal injury and/or property damage.
INSTALLATION
1. Locate the thermostat 4 to 6 FT. above the floor, where it will be exposed to an average temperature of the controlled space.
Do not mount near windows, doors or direct sunlight.
2. Remove the thermostat cover. Position the box with the wiring hole oriented as desired. Fasten the box to the wall with 4
screws through the mounting holes.
3. The thermostat may be installed using conduit, flexible cable or other code approved wiring methods. All fittings and materials
used in the installation should be approved for the application and should be installed in accordance with their instructions.
CAUTION The conduit hub, cord seal or other device used for connection should be UL Listed and marked NEMA 4X. The conduit
hub is to be installed into the conduit before installing into the enclosure.
4. A drip loop should be used to prevent water or other fluids from entering the thermostat housing. The cable or conduit
connections to the enclosure must be water and dust tight. Even though this thermostat is sealed, an improper wiring seal
could cause water or dust to enter the enclosure, resulting in possible personal injury, property damage and also voids the
warranty.
5. Complete the wiring by attaching the thermostat leads in accordance to the applicable wiring diagram using wire nuts (not
provided). A green ground wire is provided to attach the line and equipment ground to the thermostat assembly. After the
connections are made, all wires should be pushed back into the box.
6. The thermostat cover should now be attached to the box using the four screws provided. Do not use any other screws.
The cover assembly uses a resilient gasket and must be tightened securely to compress the gasket and provide a watertight
seal. Do not over tighten.