T22 Series Line Voltage Thermostats with Selector Switch

Master Catalog 125 Room Thermostats Section T Product Bulletin T22 Issue Date 0389

T22 Series Line Voltage Thermostats With Selector Switch

Application fan coils, blast coils, refrigeration storage rooms, electric heat, The T22 line voltage thermostats duct furnaces, greenhouses, etc. control heating, cooling, or year Models are available with SPST ‘round air conditioning units in or SPDT contact action for commercial, industrial or standard duty (nominal 1/4 hp) residential installations. or heavy duty (nominal 1 hp) Typical uses are for unit heaters, applications.

Specifications Fig. 1 -- A T22 Thermostat with system selector knob. Attractive styling with self contained selector functions. No subbase required.

These thermostats are also suitable for low voltage applications. Thermostats are available with a variety of integral selector switches (not separate subbases -- see Specifications). All Series T22 thermostats are designed for use only as operating controls. Where an operating control failure would result in personal injury and/or loss of property, it is the responsibility of the installer to add devices (safety, limit controls) or systems (alarm, supervisory systems) that protect against, or warn of, control failure.

Fig. 2 -- Interior of a T22 with selector switch.

Fig. 4 -- Heating operating differential for T22A Fig. 3 -- A T22 Thermostat with (lower graph line). Upper graph line illustrates concealed adjustment. differential for heating side of T22T.

T22T Cooling 5 For line voltage thermostats less selector switches, refer to the 4 2.2 T26 literature (LIT-125645). 3 Features 2 1.1 1 • Sensitive liquid charge T22S, T22J Cooling 0 element and efficient 04682 leverage provides close Amperage Load differential without anticipators. Fig. 5 -- Cooling operating differential for T22S, • Thermostats have T22J is shown on lower graph line. Upper graph concealed, adjustable, high line illustrates differential for cooling side of T22T. temperature stop. (See Fig. 2.) • Choice of built-in selector switches -- and wide selection of circuitry. Requires no “add-on” subbases. • Snap-acting contacts in a Electrical Ratings sealed dust protected enclosure. • Close differential without need for anticipator. • Bimetal thermometer is standard. Easily calibrated.

General Description The cover and faceplate design makes the thermostat adaptable to any decor. The thermostats have a sturdy steel cover with “tawny silver” finish. The faceplates are dark brown and light brown with aluminum numbers and graduation marks. The liquid charged sensing element is formed to achieve maximum sensitivity to ambient air temperature changes. (See Fig. 2.)

2 T22 Product Bulletin Fig. 6 -- T22AAA (OFF-AUTO Fig. 13 -- T22SEB selector) on heating system. (HEAT-OFF-COOL selector) on Fig. 9 -- T22JAA (OFF-AUTO fan-coil unit with cycling fan selector) on cooling system. and valve.

Fig. 7-- T22ABC, T22BBC, or Fig. 10 -- T22JCC T22CBC (AUTO-OFF-FAN (AUTO-OFF-FAN selector) Fig. 14 -- T22SEB selector) on gas-fired on cooling system. (HEAT-OFF-COOL selector) on unit heater. fan-coil unit with cycling valve, continuous fan.

Fig. 11 -- T22SDA (OFF-AUTO selector) on fan-coil unit with cycling valve, continuous fan. Fig. 15 -- T22SFB or T22TFB Fig. 8-- T22ABC, T22BBC, OR Terminal markings shown for (HEAT-OFF-COOL selector) on T22CBC (AUTO-OFF-FAN A19CAC changeover control. heating-cooling system. selector) on steam or hot water coil unit.

Fig. 12 -- T22SDA (OFF-AUTO selector) on fan-coil unit with Fig. 16 -- T22SFB and T22TFB cycling fan and valve. Terminal (HEAT-OFF-COOL selector) can markings shown for A19CAC be used to control fan-coil units changeover control. with cycling valve and continuous fan. Field install a jumper between terminals 2 and 3 as shown.

T22 Product Bulletin 3 Coupled with a highly efficient current flowing through the Brand Nameplates diaphragm and leverage thermostat (amperage load), the mechanism, the element velocity of air over the Available on quantity orders. operates a totally enclosed thermostat, the rate of Contact Customer Service. Pennswitch contact unit for close temperature change to which the differential and dependable thermostat is subjected and Celsius Dial and Thermometer switching action without the use whether the thermostat is May be supplied if ordered, at no of “heat or cool" anticipators. operating heating or cooling extra charge. equipment. Elimination of anticipators increases versatility of these The graphs in Figs. 4 and 5 Thermostat Guards thermostats, allowing them to be show the operating temperature used on heating and/or cooling differentials of these thermostats Plastic, wire or cast aluminum over a wide range of current under various load conditions. guards available at extra cost. loads, either on 120 V or The air velocity was 25 feet per See the Johnson Controls 240 V systems. minute (.127 m/sec) and the rate Product Catalog. of temperature change was All types are available on special 6F° (3.3C°) per hour. For air order with concealed Ordering Information velocities greater than adjustments (temperature 25 feet per minute and/or for To order, specify: setting and selector switch). All rates of temperature change 1. Type number. thermostats are equipped with ° Allen head cover screws. less than 6F per hour, the operating differentials will be 2. Any optional constructions, These thermostats have a less than shown in Figs. 4 and 5. if required (quantity orders concealed high temperature only). stop with adjustments in 2F° Optional Constructions (1.1C°) increments between Repairs and Replacement 68 and 80°F (20 and 27°C). Concealed Adjustment Field repairs must not be made Models are available with solid except for replacement of the Operating Differential cover which conceals dial. knobs and cover. For a The operating temperature replacement thermostat, knob or differential of any self-contained cover, contact the nearest thermostat depends on the Johnson Controls wholesaler.

UL Guide No. XAPX File E6688

Controls Group 507 E. Michigan Street P.O. Box 423 Printed in U.S.A. Milwaukee, WI 53201

4 T22 Product Bulletin