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Master Catalog 125

Room Thermostats Section T

Product/Technical Bulletin T26

Issue Date 0296

Part No. 24-8466-28, Rev. —

Code No. LIT-125645

T26 Series Line Voltage Thermostats

The T26 Series line voltage thermostat controls

heating and/or cooling units in commercial, industrial,

or residential installations. Typical uses are for unit

heaters, fan coils, blast coils, electric heat, duct

furnaces, or greenhouses.

Models are available with Single-Pole Single-Throw

(SPST) or Single-Pole Double-Throw (SPDT) switches

rated for a variety of applications. The T26

thermostats are also suitable for low voltage

applications.

Figure 1: T26 Thermostat with Vertical Faceplate

Features and Benefits

❑

Narrow Differential Increases versatility of the thermostats, which

may be used on heating and/or cooling over a

wide range of voltages (24V, 120V, 240V, or

277V)

❑

Line Voltage Components

Switch Box Mounted

Provides isolation of electrical circuit from

sensing element

❑

Models with Limited Ranges

Available

Provides energy conservation

❑

Adjustable High/Low

Range Stops

Allows adjustments within a desired range

❑

Enclosed Pennswitch Provides dust protection for contacts

❑

Mounting Plate Allows easy mounting and wiring without

removing the cover

Summary of content (8 pages)

PAGE 1
Master Catalog Room Thermostats Section Product/Technical Bulletin Issue Date 125 T T26 0296 T26 Series Line Voltage Thermostats The T26 Series line voltage thermostat controls heating and/or cooling units in commercial, industrial, or residential installations. Typical uses are for unit heaters, fan coils, blast coils, electric heat, duct furnaces, or greenhouses. Models are available with Single-Pole Single-Throw (SPST) or Single-Pole Double-Throw (SPDT) switches rated for a variety of applications.
PAGE 2
I ntroduction 2.2 3 1.1 2 1 0 T26A and T26S Heating 0 2 4 6 8 10 12 14 16 18 20 22 Operating Differential C° T26B and T26T Heating 4 Amperage Load Note: The dark shading applies to non-inductive loads only. Figure 2: Operating Differentials for T26A, T26B, and Heating Side for T26S and T26T An adjusting knob and easy-to-read dial allow quick selection of the desired setpoint. The thermostat is supplied with the faceplate installed for vertical mounting and knob adjustment.
PAGE 3
Location Considerations • away from direct sunlight or radiant heat, outside walls or behind doors, air discharge grills, stairwells, or outside doors • away from steam or water pipes, warm air stacks, or heated/uncooled areas Locate the T26 thermostat as follows: • on a partitioning interior wall, and approximately 5 ft (1.5 m) above the floor in a location of average temperature Dimensions 6-32 Mounting Screws (Two Places) 0.69 18 1.20 30 1.34 34 3.22 82 2.34 59 4.71 120 0.80 20 2.96 75 1.
PAGE 4
IMPORTANT: Do not remove the thermostat cover during installation. The sensing element must be carefully protected against accidental damage. All wiring and mounting can be completed without removing the cover. h h 1 ! Line Neutral CAUTION: Shock hazard. Disconnect power supply before wiring connections are made to avoid electrical shock or possible damage to the equipment.
PAGE 5
Heating and Cooling Table 1: Electrical Ratings h T26A, T26S Motor Ratings 3 1 2 Line Neutral H° °C H° Manual or Automatic °C Changeover Switch To Heating Load To Cooling Load 120V 208V 240V 277V AC Full Load Ampere 6.0 3.5 3.0 -- AC Locked Rotor Ampere 36.0 21.0 18.0 -- AC Non-inductive Ampere 10.0 10.0 10.0 10.
PAGE 6
High Range Stop 1. Set the adjustment knob to the maximum desired temperature setting. 2. Pull the adjustment knob off the thermostat cover. 3. Loosen the bottom cover screw and remove the cover. 4. While holding the dial firmly in place, keeping the setting in line with the reference mark, depress the tab “A” (see Figure 12) and rotate it clockwise until it is against the stop pin “C”. 4.
PAGE 7
O rdering Information Table 2: Ordering Information Item Product Code Number Thermostat, SPST, Heating T26A Thermostat, SPST, Heavy Duty Heating T26B Thermostat, SPST, Cooling T26J Thermostat, SPDT, Heating, Cooling, or Heating and Cooling T26S Thermostat, SPDT, Heavy Duty Heating, Cooling, or Heating and Cooling T26T 1 Table 3: Faceplate Ordering Information (For T26 Thermostats with Plastic Cover) Kit Number Mounting Position Adjustment Type Thermometer Cutout Temperature Scale 1 Vertic
PAGE 8
R eplacement Parts Table 4: Replacement Parts Item Product Code Number Cover Assembly for Knob Adjustment Models with Thermometer, °F Scale, Vertical Faceplate (Horizontal Faceplate Supplied Unassembled) CVR88A-600R Thermoplastic Push On Adjustment Knob KNB26A-600R Thermostat Mounting Plate PLT51A-602R Mounting Plate for Thermostat and Selector Switch PLT61A-600 Double Gang Box Mounting Plate PLT231-1R Specifications Product Contact Ratings Measurement Range Differential Ambient Operating Temper