JA. 8-71 60-2196 Form Number Residential Div, T991A Proportional Temperature Controllers provide modulating control of water or air temperatures in ducts, tanks, and similar applications. Standard models have sensing bulb and capillary; fast response models have a coiled sensing element that operates at least four times faster than standard controllers, depending upon operating conditions. C All models compensate for effects of ambient temperature on the case and tubing.
MODELS: T991A Temperature Controller—standard or fast response. ELECTRICAL RATING: 24 to 30v ac, POTENTIATE RESISTANCE: 135 ohms (280 vhs available as option on model with 55 to 173 F range). TEMPERATURE RANGES AND LIMITS: KNOCKOUT FOR CONDUIT {2} Maxims: Ambient] Marian Ope rating Range | Temperature for | Temperature for Controller Bulb 0to 100 F 125 F 55 to 175 ¥° 200 7 80 to 180 © 125 ¥ 200 F 160 to 260 F 280 F Tito 35 C1 520 1540 20t s0C sae 125 C 38 C Available 7/64 O.D.
CAUTION: Disconnect power supply. instillation should be made only by a qualified serviceman, Tinfoil instructions of system manufacturer, if available, LOCATION ‘The T991A may be mounted in any convenient position on a flat surface where the ambient temperature does not exceed 125 F. ‘When mounting on a hot or cold surface, mount the case on a wood board or other insulating material, The capillary tube provides for remote mounting.
TO INSTALL SENSING BULB IN TANK OR BOILER: The bulb may be inserted directly into a tank or boiler tapping by means of a pressure fitting (see ACCESSORIES), or the bulb may be inserted into an immersion well that is screwed into the tank or boiler (see ACCESSORIES). To install pressure fishing: He THREAD A constriction | ! (TIC cn fan ve A E80 ER PLUG SL swore wanness TEAR Eau FIG. 7-PRESSURE FITTING ASSEMBLY. 1, Drain system, and screw boiler plug into properly sized and threaded holier or pipe tapping NP.