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X-XX UL

INSTALLATION INSTRUCTIONS

®U.S. Registered Trademark

T874R Thermostats and Q674L Subbases

Installation Instructions for the Trained Service Technician.

APPLICATION

The T874R Thermostat and Q674L Subbase provide 24 to 30 Vac control of 2-stage heating and 1-stage cool-ing heat

pump systems with manual changeover. Q674L Subbase provides EM.HT.-HEAT-OFF-COOL system switching and

AUTO-ON fan switching. See Table 1 for specific T874R/Q674L combinations.

Table 1. Thermostat/Subbase Specifications.

Thermostat/

Subbase

Package

Thermostat/

Subbase

Model

Numbers

LED

Indication Changeover Comments

See

Fig.

Y594R1243 T874R1152/

Q674L1207

AUX.HT.,

EM. HT.

Manual Cool

TRADELINE

; adjustable stage 2

heat anticipation. Fixed anticipation

in stage 1. Auto fan in EM.HT.

Y594R1300 T874R1475/

Q674L1520

AUX.HT.,

EM. HT.

Manual Heat

or Cool

TRADELINE

; fixed heat

anticipation. Auto fan in EM.HT.

Y594R1425 T874R1616/

Q674L1587

AUX.HT.,

EM. HT.,

CHECK

Manual Heat

or Cool

SUPER TRADELINE

; fixed heat

anticipation. Factory installed jumper

across W1 and Y1. Auto fan in

EM.HT.

Y594R1615 T874R1822/

Q674L1710

AUX.HT.,

EM. HT.,

CHECK

Manual Heat

or Cool

TRADELINE

; fixed heat

anticipation. Auto fan in EM.HT.

Y594R1664 T874R1871/

Q674L1736

EM. HT. Manual Cool

TRADELINE

; exact replacement

for York model no. 2TH11702224.

Y594R1672 T874R1889/

Q674L1736

EM. HT. Manual Cool

TRADELINE

; exact replacement

for York model nos. 2TH11702324

and 6TH11702224.

Y594R1698

T874R1905/

Q674L1777

EM. HT. Manual Cool

TRADELINE

; exact replacement

for York model nos. 2TH11702324

and 6TH11702224. Includes

C815A1054 Outdoor Thermistor.

Y594R1706

T874R1913/

Q674L1777

EM. HT. Manual Cool

TRADELINE

; exact replacement

for York model no. 2TH11702224.

Y594R1763 T874R1954/

Q674L1827

AUX.HT.,

EM. HT.

Manual Cool Requires C815A Outdoor Thermister

for outdoor reset. Fixed stage 1 heat

anticipation. No heat anticipation in

stage 2 heat. Auto fan in EM.HT.

Replaces Y594R1136.

Y594R1797 T874R1988/

Q674L1868

AUX.HT.,

EM.HT.

Manual Heat

or Cool

TRADELINE

EM.HT. LED also shows compressor malfunction.

Premier White® color.

69-0392-9

1 2 3 4 5 6 ... 11 12

Resumo do Conteúdo

Página 1 - APPLICATION

Página 2 - RECYCLING NOTICE

69-0392—910T874R THERMOSTATS AND Q674L SUBBASES

Página 3

69-0392—911T874R THERMOSTATS AND Q674L SUBBASES

Página 4

69-0392—912T874R THERMOSTATS AND Q674L SUBBASES69-0392—9 G.H. Rev. 10-97 www.honeywell.com/yourhomeAutomation and Control SolutionsHoneywell Inter

Página 5 - TRADELINE

69-0392—92T874R THERMOSTATS AND Q674L SUBBASESOPERATIONOn a 2-heat thermostat, the two stages of heat makesequentially as the temperature drops. Make

Página 6

69-0392—93T874R THERMOSTATS AND Q674L SUBBASESM925VERTICAL OUTLETBOXADAPTERRINGSUBBASECOVER PLATEMOUNTINGSCREWS (2)MOUNTINGSCREWS (2)1SUBBASEMOUNTINGS

Página 7

69-0392—94T874R THERMOSTATS AND Q674L SUBBASESFig. 5. Internal schematic and typical wiring diagram for Y594R1763 (T874R1954/Q674L1827). ReplacesGE AY

Página 8 - SETTINGS

69-0392—95T874R THERMOSTATS AND Q674L SUBBASESFig. 7. Internal schematic and typical wiring diagram for Y594R1300 (T874R1475/Q674L1520); fixed anticip

Página 9 - CALIBRATION

69-0392—96T874R THERMOSTATS AND Q674L SUBBASESFig. 9. Internal schematic and typical wiring diagram for Y594R1664 (T874R1871/Q674L1736) and Y594R1706(

Página 10 - 69-0392—9

69-0392—97T874R THERMOSTATS AND Q674L SUBBASESFig. 11. Internal schematic and typical wiring diagram for Y594R1672 (T874R1889/Q674L1736) and Y594R1698

Página 11

69-0392—98T874R THERMOSTATS AND Q674L SUBBASESMounting the Thermostat1. Remove the thermostat cover by pulling the bottomedge of the cover away from t

Página 12

69-0392—99T874R THERMOSTATS AND Q674L SUBBASESM5070CHECKOUTHeatingMove the system switch on the Q674 Subbase to HEAT.Move the setpoint lever on the T8

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