Honeywell T841A Installation Instructions Manual Download | Manualshive

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T841A HEATING-COOLING THERMOSTATS

L1

L2

Fig. 14. T841A with two auxiliary heat stages and AUX.HT. and EM.HT. LEDs. Provides auto fan in emergency heat.

Fig. 15. T841A with EM. HT. and AUX. HEAT LEDs. Provides outdoor reset when used with C815 Thermistor.

69-1218

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Summary of Contents for T841A

Page 1: ...W1 Y G R E C X O B EM HT AUX HT Yes 14 W Y G R T F X2 O B U EM HT AUX HT Yes 15 W2 Y G R E B X Yes 16 OPERATION The stages of heat make sequentially as the temperature drops Make refers to the mercury switch initiating a call for heat or cool There is about 1 F 0 6 C between stages so the second stage auxiliary heat makes only when the first stage cannot handle the load This 1 F is the interstage ...

Page 2: ...rage temperature Do not mount thermostat where it may be affected by drafts or dead spots behind doors and in corners hot or cold air from ducts radiant heat from sun or appliances concealed pipes and chimneys unheated uncooled areas behind the thermostat such as an outside wall This thermostat is a precision instrument and was carefully adjusted at the factory Handle itcarefully Mounting and Wiri...

Page 3: ... w s at the m id d le o f the d evice 8 Install tw o s c re w s in the top m o u ntin g h o le s and tig hte n IMPORTANT An incorrectlyleveled subbase willcause the temperature control to deviate from setpoint It is not a calibrationproblem 9 R e place the th e rm o sta t cover ODT 1 L1 HOT L2 CHANGEOVER RELAY COOL POWER SUPPLY PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTIONAS REQUIRED DO NOT JUM...

Page 4: ...Internal schematic and typical wiring diagram for T841A with EM HT and AUX HT LEDs Provides cool changeover relay control only Cool changeover O wire must be connected for proper operation Use L terminal for compressor malfunction indication 69 1218 4 ...

Page 5: ... for T841A with fan in Emergency Heat mode 2 stage heat 1 stage cool manual changeover L1 L2 HOT Fig 5 Internal schematic and typical wiring diagram for T841A with EM HT and AUX HT LEDs Provides outdoor reset when used with C815 Thermistor Provides cool changeover relay control 5 69 1218 ...

Page 6: ...JUMPER E TO W2 TERMINAL L1 L2 HOT W 3 a R W 2 AUX HT LED GREEN E a y RTD 1 ODT 1 J HhH T HHl EHR 1 RTD 2 ODT 2 m TEEh EHR 2 RTD y r m a t J VH A EM HT LED RED X h Y c EM HEAT RELAY A V H V CHANGEOVER VALVE HEAT COMPRESSOR CONTACTOR VH CHANGEOVER VALVE COOL T v Fig 7 Internal schematic and typical wiring diagram for T841A with AUX HT and EM HT LEDs Provides both heat and cool changeover relay contr...

Page 7: ... typical wiring diagram for T841A with AUX HT and EM HT LEDs Provides both heat and cool changeover relay control CHANGEOVER VALVE COOL Fig 9 Internal schematic and typical wiring diagram with AUX HT and EM HT LEDs Provides both heat and cool changeover relay control 7 69 1218 ...

Page 8: ...T841A HEATING COOLING THERMOSTATS FAN RELAY Fig 11 Internal schematic and typical wiring diagram for T841A with EM HT and COMP FAULT LEDs Common X wire must be connected for proper operation 69 1218 8 ...

Page 9: ...MOVE W1 Y1 JUMPER WHEN HEAT RELAY 1 IS USED WHEN L TERMINAL IS CONNECTED TO SYSTEM MONITOR EM HEAT LED ALSO INDICATES COMPRESSOR MALFUNCTION X TERMINAL MUST BE CONNECTED FOR PROPER OPERATION M1103C Fig 13 Internal schematic and typical wiring diagram for T841A with EM HT and AUX HT LEDs Provides both heat and cool changeover relay control 9 69 1218 ...

Page 10: ...ERMOSTATS L1 L2 Fig 14 T841A with two auxiliary heat stages and AUX HT and EM HT LEDs Provides auto fan in emergency heat Fig 15 T841A with EM HT and AUX HEAT LEDs Provides outdoor reset when used with C815 Thermistor 69 1218 10 ...

Page 11: ...cale System Switch Setting T h e s yste m s w itch in g p o sitio n s co ntro l the sys te m o p e ra tio n a s follow s EM HT T 8 4 1 A o n ly e m e rg e n c y h ea t re la y is e n e rg ize d C o oling s yste m is off C o m p re s s o r is d e e n e rg ize d Fan runs w ith call fo r h eat in A U T O position EM HT LE D is on H E A T h ea ting sy ste m is a u to m a tic a lly c o n tro lle d b y ...

Page 12: ...fan operation is controlled by the heating or cooling system control circuit Outdoor Reset Thermistor Honeywell C815A1005 For system shown in Fig 5 the thermistor must be used if not thermostat performance deviates radically from proper operation The proper thermostat operation must be verified to assure the correct operation of the thermostat Check thermistor operation as follows 1 Disconnect the...

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