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TRADELINE
T8611G,R
Chronotherm III
Fuel Saver Thermostats
The AUX. HT., EM. HT., and CHECK LEDS are located
Application
near the bottom center of the subbase. See Table 1. The AUX.
These thermostats provide energy saving control for a 24
HT. LED lights whenever the thermostat is calling for
Vac multistage heat pump heating/cooling system as indi-
operation of the backup or auxiliary heater. Backup (auxil-
cated in Table 1 and are powered directly from the control
iary) heat is more expensive to
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SYSTEM FAN ON AUTO EM. HT. HEAT OFF AUTO COOL AUX. HEAT CHECK by— Fig. 2—Mounting subbase on wall. —drafts or dead spots behind doors, in corners or under cabinets. —hot or cold air from ducts. WALL —radiant heat from sun or appliances —concealed pipes and chimneys. WIRES THROUGH WALL —unheated (uncooled) areas behind the thermostat, such WALL OPENING ANCHORS as an outside wall. (2) IF REPLACING AN EXISTING THERMOSTAT Turn off power to thermostat at furnace or heat pump. A two-transformer syste
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Fig. 4—T8611G 2-stage heat/1-stage cool thermostat. 1 L1 L2 (HOT) 2 R POWER SUPPLY HIGH LIMIT C/X EM. HEAT AUX. HEAT LED (GRN) LED (RED) L FAN SWITCH MONITOR ON W2 SUBBASE AUTO HEAT 2 THERMOSTAT LOGIC/ AUXILIARY LOGIC CONTROL HEAT RELAY CIRCUIT CIRCUIT E EMERGENCY HEAT RELAY SYSTEM SWITCH EM. HT. G HEAT FAN RELAY OFF C.O. O AUTO CHANGEOVER COOL C.O. RELAY (COOL) B HIGH LIMIT CHANGEOVER COOL HEAT 1 RELAY (HEAT) Y COMPRESSOR CONTACTOR 1 POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PR
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Fig. 5—T8611R 2-stage heat/1-stage cool thermostat. 1 L1 L2 (HOT) 3 R POWER HIGH SUPPLY LIMIT C/X AUX. HEAT EM. HEAT LED (GRN) LED (RED) L FAN SWITCH MONITOR ON W2 SUBBASE AUTO THERMOSTAT LOGIC/ AUXILIARY HEAT 2 LOGIC HEAT RELAY CONTROL CIRCUIT CIRCUIT E EMERGENCY HEAT RELAY SYSTEM W1 SWITCH STAGE 1 HEAT RELAY EM. HT. G HEAT FAN RELAY OFF 2 O COOL CHANGEOVER RELAY (COOL) B HIGH CHANGEOVER LIMIT HEAT 1 RELAY (HEAT) Y1 COOL COMPRESSOR CONTACTOR P POWER SUPPLY. PROVIDE DISCONNECT MEANS AND
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Fig. 6—T8611R 2-stage heat/1-stage cool thermostat. Exact replacement for York model no. 2ET11700224. R L1 POWER (HOT) 1 HIGH SUPPLY LIMIT L2 5 B TRANSFORMER EM. HEAT 3 LED (RED) X FAN MONITOR SWITCH ON W2 SUBBASE THERMOSTAT LOGIC/ 4 AUXILIARY AUTO LOGIC CONTROL HEAT 2 HEAT RELAY CIRCUIT CIRCUIT E EMERGENCY HEAT RELAY SYSTEM W1 SWITCH STAGE 1 HEAT RELAY EM. HT. G HEAT FAN RELAY OFF 2 O AUTO CHANGEOVER RELAY (COOL) H HIGH CHANGEOVER LIMIT HEAT 1 COOL RELAY (HEAT) Y1 COMPRESSOR CONTACTOR 1
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When the batteries are low, the display will flash REPL Fig. 9—Mounting the thermostat on subbase. BAT. Homeowner will have 20-30 seconds to replace batter- ies after removing batteries from thermostat. After 20-30 seconds, it will be necessary to reprogram. REPL BAT indication will be disappear when thermostat is mounted back on the powered subbase. MOUNTING THE THERMOSTAT With system switch set to OFF, hang the thermostat on the tabs at the top of the subbase (Fig. 9A). Swing down and press on
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Perform the following test as a check of all thermostat System Press Look for this functions. If thermostat does not respond as indicated, ther- Switch This Response mostat must be replaced. 1. Press AHEAD and BACK keys at the same time. Position Key Key Down Key Released While holding keys down, all segments of the display should CHANGE OFF 03 Blank TO LAST be on, see Fig. 10. PERIOD 2. Set system switch to OFF. Press AHEAD and BACK SKIP 07 Blank NEXT and PRESENT SETTING keys at the same time t
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4-DIGIT CODE EXPLANATION Second Clock Digit (Hrs.) Degrees Cycle Rate Setting 012 F First (CPH at 50% on time, 112 C Digit 2nd stage heat) 424 F 0 or 2 6 524 C 4 or 6 3 M 524 Third System System Digit Switch Position Fourth Thermostat Switch Digit Type No. Position 0 HEAT, EM.HT, or OFF 0R COOL, OFF 2 AUTO 1G COOL, 4 COOL AUTO or OFF 2R EM.HT. or HEAT 3G AUTO, EM.HT. or HEAT Refer to Owner’s Manual for programming instructions and homeowner troubleshooting. This equipment is a Class B digital ap
