Honeywell T8621D manual

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Table of contents for the manual

  • Page 1

    APPLICATION T8621A,C,D, CHRONOTHERM III FUEL SAVER THERMOSTATS These thermostats provide energy saving control for a 24 Vac heating/cooling system as indicated in Table 1, and are powered direct from the control transformer. As long as thermostat is continuously powered, the thermostat will be compatible with any control system. These models includ[...]

  • Page 2

    2 Fig. 2—Mounting subbase on wall. Fig. 3—Restrict wiring to recessed area surrounding terminals. WIRING All wiring must comply with local electrical codes and ordinances. Disconnect power before wiring to prevent electrical shock or equipment damage. The shape of the terminal barrier permits insertion of straight or conventional wraparound wir[...]

  • Page 3

    3 69-0330 — 3 Fig. 5 — T8621C,D 2-stage heat/2-stage cool thermostat with HEAT-AUTO-COOL-OFF system and AUTO-ON fan switching. For T8621C, delete second cooling stage. Fig. 6 — T8621C,D single-stage heat pump thermostats with cooling changeover. HEAT-AUTO-COOL- OFF system and AUTO-ON fan switching. M1573 HEATING TRANSFORMER R C W1 W2 HEAT REL[...]

  • Page 4

    4 Fig. 8 — T8621D 2-stage heat/2-stage cool manual changeover thermostat with auto fan on heat and cool; convertible to auto fan on cool only. HEAT-OFF-COOL system and AUTO-ON fan switching. Fig. 7 — T8621C,D single-stage heat pump thermostats with heating changeover. HEAT-AUTO-COOL- OFF system and AUTO-ON fan switching. M1576 SYSTEM TRANSFORME[...]

  • Page 5

    5 69-0330 — 3 Fig. 9 — T8621D single-stage manual changeover heat pump thermostat. HEAT-OFF-COOL system and AUTO-ON fan switching. The room air temperature will normally vary slightly from the comfort temperature setting with the cycling of the furnace or air conditioner. The heating cycle rate of this thermostat is factory-set for gas/oil warm[...]

  • Page 6

    When the batteries are low, the display will flash REPL BAT. The building owner will have 20-30 seconds to install new batteries after removing old batteries from thermostat. After 20-30 seconds, it will be necessary to reprogram. REPL BAT indication will disappear when ther- mostat is mounted back on the subbase. If batteries are completely dead, [...]

  • Page 7

    SYSTEM PRESS LOOK FOR THIS RESPONSE SWITCH THIS KEY KEY POSITION KEY DOWN RELEASED OFF 03 Blank 07 Blank 15 Blank COOL or 15 1st stage cooling, AUTO (with fan and SYSTEM f a n in A UT O) LED on. 15 2nd stage cooling also on. 15 2nd stage cooling off. 15 1st stage cooling, fan and SYSTEM LED off. NOTE: If single-stage cooling system, press key twice[...]

  • Page 8

    SYSTEM FOURTH CLOCK SWITCH DIGIT DEGREES (HRS) POSITION 0 F 12 COOL, AUTO or OFF 1 F 24 COOL, AUTO or OFF 2 F 12 HEAT 3 F 24 HEAT 4 C 12 COOL, AUTO or OFF 5 C 24 COOL, AUTO or OFF 6 C 12 HEAT 7 C 24 HEAT Honeywell Inc. International Sales Offices in all principal cities of the world. Manufacturing in U.S.A.: 1885 Douglas Drive N. Australia, Canada,[...]