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Bryant Q674, T874 Fig. 247. Schematic and hookup of T874W with Q674L. Used in heat pump applications.

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T874 MULTISTAGE THERMOSTATS AND Q674 SUBBASES

60-2485—8222

Fig. 247. Schematic and hookup of T874W with Q674L. Used in heat pump applications.

C815A OUTDOOR

THERMISTOR

AUX. HT. RELAY

FAN RELAY

EM. HT. RELAY

CHANGEOVER

RELAY (HEAT)

CHANGEOVER

RELAY (COOL)

COMPRESSOR

CONTACTOR 1

COMPRESSOR

CONTACTOR 2

EM.HT.

AUTO

FAN SWITCH

H1 ANTICIPATOR

H2 ANTICIPATOR

H3 ANTICIPATOR

RESET

FALL

AUX. HEAT

LED (GREEN)

POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.

CONNECT CHANGEOVER RELAY TO 'O' TERMINAL FOR CHANGEOVER IN COOLING OR TO 'B' TERMINAL FOR CHANGEOVER IN HEATING. M6999

C1 ANTICIPATOR

RISE

RISE C2 ANTICIPATOR

EM. HEAT

LED (RED)

CHECK LED

(YELLOW)

HEAT

OFF

COOL

SYSTEM

SWITCH

THERMOSTAT SUBBASE SYSTEM COMPONENTS

(HOT)

L21

Contents

Main PRODUCT DATA T874 Multistage Thermostats and Q674 Subbases APPLICATION FEATURES Contents ORDERING INFORMATION SPECIFICATIONS Super Tradeline/Tradeline Models Super Tradeline Models Tradeline Models Standard Models Page Page Page T874 MULTISTAGE THERMOSTATS AND Q674 SUBBASES MERCURY NOTICE INSTALLATION When Installing this Product Location Mount Subbase Wire Subbase Page Outdoor Disconnect ithin remains Install and Adjust Stop Brackets not SETTINGS Set the Heat Anticipator Temperature Setting Subbase Setting Setting the Adjustable Differential wider larger CHECKOUT Heating Cooling Fan Outdoor Reset Thermistor (Where Applicable) CALIBRATION Thermostat Thermometer UNDERSTANDING CIRCUITS Tracing Method: Page Fig. 18. Tracing the changeover relay circuit. Fig. 19. Tracing the heat 1 and anticipation circuit. Fig. 20. Tracing the heat 1 anticipation circuit. Fig. 21. Tracing the heat 2, anticipation and AUX. HT. LED circuit. Fig. 22. Tracing the emergency heat and EM. HT. LED circuit. Fig. 23. Tracing the cooling circuit. Fig. 24. Tracing the auto fan circuit. Fig. 25. Tracing the fan on circuit. OPERATION Heat Anticipation/Cool Anticipation anticipates current anticipation voltage anticipation Service and Replacement of C815A Outdoor Thermistor 80 50 60 70 80 Features LED Indicators This must be done during installation. Commercial Rooftop Application Enthalpy Heat Pump Application Space Temperature Sensing Low Voltage Controls Two-Stage Thermostat Cycling Rate Voltage Anticipation designed into Outdoor Reset Outdoor ResetHow it Works Low Temperature Lockouts COP = Heat Pumps with Dual Compressors Two speed Heat Pump Defrost Control Defrosting Defrost Control Functions quipment safety economy of operation Stage or Time Modulated Control Outdoor thermostats time modulated thermostat jiggler Three-Stage Thermostat Crankcase Heat Compressor Fault Relay CROSS REFERENCE Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page T874 MULTISTAGE THERMOSTATS AND Q674 SUBBASES Page Page Page Page Page Page Page Page WIRING DIAGRAMS Fig. 44. Schematic and hookup of T874A,B,C,D,E,F with Q674B. Used in standard applications. Fig. 45. Schematic and hookup of T874C,D with Q674B. Used in standard applications. Fig. 46. Schematic and hookup of T874A,B,D with Q674B. Used in standard applications. . Fig. 47. Schematic and hookup of T874R with Q674B. Used in heat pump applications. Fig. 48. Schematic and hookup of T874D with Q674B. Used in standard applications. Fig. 49. Schematic and hookup of T874C with Q674B. Used in standard applications. Fig. 50. Schematic and hookup of T874G with Q674B. Used in heat pump applications. Fig. 51. Schematic and hookup of T874D with Q674B. Used in standard applications. Fig. 52. Schematic and hookup of T874C with Q674B. Used in standard applications. W1 G RC W3 W2 F RH B O Y1 COMPRESSOR CONTACTOR Fig. 53. Schematic and hookup of T874D with Q674B. Used in standard applications. Fig. 54. Schematic and hookup of T874W with Q674B. Used in standard applications. Fig. 55. Schematic and hookup of T874A,D,F with Q674D. Used in standard applications. Fig. 56. Schematic and hookup of T874C with Q674B. Used in standard applications. Fig. 57. Schematic and hookup of T874P with Q674B. Used in heat pump applications. Fig. 58. Schematic and hookup of T874G with Q674D. Used in standard applications. Fig. 59. Schematic and hookup of T874A with Q674Q. Used in fan coil applications. Fig. 60. Schematic and hookup of T874C with Q674N. Used in evaporative cooler applications. Fig. 61. Schematic and hookup of T874C with Q674N. Used in evaporative cooler applications. Fig. 62. Schematic and hookup of T874F with Q674B. Used in wood/coal applications. Fig. 63. Schematic and hookup of T874F with Q674D. Used in wood/coal applications. Fig. 64. Schematic and hookup of T874A with Q674Q. Used in fan coil applications. Fig. 65. Schematic and hookup of T874A with Q674B. Used in standard applications. Fig. 66. Schematic and hookup of T874A,D,F with Q674D. Used in standard applications. Fig. 67. Schematic and hookup of T874R with Q674B. Used in heat pump applications. Fig. 68. Schematic and hookup of T874P with Q674B. Used in heat pump applications. Fig. 69. Schematic and hookup of T874V with Q674R. Used in fan coil applications. Fig. 70. Schematic and hookup of T874C with Q674S. Used in heat pump applications. Fig. 71. Schematic and hookup of T874A-D with Q674A. Used in standard applications. Fig. 72. Schematic and hookup of T874D,E,F with Q674C. Used in standard applications. Fig. 73. Schematic and hookup of T874G with Q674C. Used in heat pump applications. Fig. 74. Schematic and hookup of T874H with Q674C. Used in heat pump applications. Fig. 75. Schematic and hookup of T874A with Q674C. Used in standard applications. Fig. 76. Schematic and hookup of T874A-D with Q674C. Used in standard applications. Fig. 77. Schematic and hookup of T874K with Q674C. Used in heat pump applications. Fig. 78. Schematic and hookup of T874P with Q674C. Used in heat pump applications. Fig. 79. Schematic and hookup of T874G,H with Q674C. Used in standard applications. Fig. 80. Schematic and hookup of T874D with Q674E. Used in standard applications. Fig. 81. Schematic and hookup of T874C with Q674C. Used in heat pump applications. Fig. 82. Schematic and hookup of T874A,C,D with Q674E. Used in standard applications. Fig. 83. Schematic and hookup of T874G with Q674C. Used in standard applications. Fig. 84. Schematic and hookup of T874G with Q674E. Used in heat pump applications. Fig. 85. Schematic and hookup of T874A-D with Q674E. Used in standard applications. Fig. 86. Schematic and hookup of T874G with Q674E. Used in heat pump applications. Fig. 87. Schematic and hookup of T874D with Q674E. Used in standard applications. Fig. 88. Schematic and hookup of T874B,D with Q674E. Used in standard applications. Fig. 89. Schematic and hookup of T874D with Q674E. Used in standard applications. Fig. 90. Schematic and hookup of T874D with Q674G. Used in standard applications. Fig. 91. Schematic and hookup of T874A-F,Q with Q674G. Used in standard applications. Fig. 92. Schematic and hookup of T874C with Q674G. Used in heat pump applications. Fig. 93. Schematic and hookup of T874D with Q674K. Used in standard applications. Fig. 94. Schematic and hookup of T874D with Q674G. Used in standard applications. Fig. 95. Schematic and hookup of T874F with Q674K. Used in wood/oil applications. Fig. 96. Schematic and hookup of T874C with Q674C. Used in standard applications. Fig. 97. Schematic and hookup of T874P with Q674C. Used in heat pump applications. Fig. 98. Schematic and hookup of T874D with Q674E. Used in standard applications. Fig. 99. Schematic and hookup of T874C with Q674C. Used in standard applications. Fig. 100. Schematic and hookup of T874W with Q674C. Used in standard applications. Fig. 101. Schematic and hookup of T874R with Q674L. Used in heat pump applications. Fig. 102. Schematic and hookup of T874J,R with Q674L. Used in heat pump applications. Fig. 103. Schematic and hookup of T874G with Q674L. Used in heat pump applications. Fig. 104. Schematic and hookup of T874R with Q674L. Used in heat pump applications. Fig. 105. Schematic and hookup of T874C with Q674L. Used in heat pump applications. Fig. 106. Schematic and hookup of T874R with Q674L. Used in heat pump applications. Fig. 107. Schematic and hookup of T874D with Q674L. Used in heat pump applications. Fig. 108. Schematic and hookup of T874R with Q674L. Used in heat pump applications. Fig. 109. Schematic and hookup of T874R with Q674L. Used in heat pump applications. Fig. 110. Schematic and hookup of T87C,R with Q674L. Used in heat pump applications. Fig. 111. Schematic and hookup of T874R with Q674L. Used in heat pump applications. Fig. 112. Schematic and hookup of T874R with Q674L. Used in heat pump applications. Fig. 113. Schematic and hookup of T874R with Q674L. Used in heat pump applications. Fig. 114. Schematic and hookup of T874D with Q674L. Used in heat pump applications. Fig. 115. Schematic and hookup of T874R with Q674L. Used in heat pump applications. Fig. 116. Schematic and hookup of T874R with Q674L. Used in heat pump applications. Fig. 117. Schematic and hookup of T874D with Q674L. Used in heat pump applications. Fig. 118. Schematic and hookup of T874W with Q674L. Used in heat pump applications. Fig. 119. Schematic and hookup of T874R with Q674L. Used in heat pump applications. Fig. 120. Schematic and hookup of T874R with Q674L. Used in heat pump applications. Fig. 121. Schematic and hookup of T874C with Q674L. Used in heat pump applications. Fig. 122. Schematic and hookup of T874R with Q674L. Used in heat pump applications. Fig. 123. Schematic and hookup of T874R with Q674L. Used in heat pump applications. Fig. 124. Schematic and hookup of T874J with Q674L. Used in heat pump applications. Fig. 125. Schematic and hookup of T874R with Q674L. Used in heat pump applications. Fig. 126. Schematic and hookup of T874G with Q674P. Used in heat pump applications. Fig. 127. Schematic and hookup of T874C with Q674L. Used in heat pump applications. Fig. 128. Schematic and hookup of T874R with Q674L. Used in heat pump applications. Fig. 129. Schematic and hookup of T874G with Q674L. Used in heat pump applications. Fig. 130. Schematic and hookup of T874R with Q674L. Used in heat pump applications. Fig. 131. Schematic and hookup of T874R with Q674L. Used in heat pump applications. Fig. 132. Schematic and hookup of T874R with Q674L. Used in heat pump applications. Fig. 133. Schematic and hookup of T874R with Q674L. Used in heat pump applications. Fig. 134. Schematic and hookup of T874R with Q674L. Used in heat pump applications. Fig. 135. Schematic and hookup of T874R with Q674L. Used in heat pump applications. Fig. 136. Schematic and hookup of T874R with Q674L. Used in heat pump applications. Fig. 137. Schematic and hookup of T874R with Q674L. Used in heat pump applications. Fig. 138. Schematic and hookup of T874L with Q674B. Used in heat pump applications. O R B Fig. 140. Schematic and hookup of T874W with Q674L. Used in heat pump applications. Fig. 141. Schematic and hookup of T874C with Q674F. Used in standard applications. Fig. 142. Schematic and hookup of T874C,D with Q674F. Used in standard applications. Fig. 143. Schematic and hookup of T874G with Q674B. Used in heat pump applications. Fig. 144. Schematic and hookup of T874J with Q674J. Used in heat pump applications. Fig. 145. Schematic and hookup of T874G with Q674F. Used in heat pump applications. Fig. 146. Schematic and hookup of T874D with Q674F. Used in heat pump applications. Fig. 147. Schematic and hookup of T874G with Q674F. Used in heat pump applications. Fig. 148. Schematic and hookup of T874G with Q674F. Used in heat pump applications. Fig. 149. Schematic and hookup of T874C with Q674F. Used in heat pump applications. Fig. 150. Schematic and hookup of T874G with Q674F. Used in heat pump applications. Fig. 151. Schematic and hookup of T874G with Q674F. Used in heat pump applications. Fig. 152. Schematic and hookup of T874D with Q674F. Used in standard applications. Fig. 153. Schematic and hookup of T874G with Q674F. Used in heat pump applications. Fig. 154. Schematic and hookup of T874G with Q674F. Used in heat pump applications. Fig. 155. Schematic and hookup of T874G with Q674F. Used in heat pump applications. Fig. 156. Schematic and hookup of T874G with Q674F. Used in heat pump applications. Fig. 157. Schematic and hookup of T874G with Q674F. Used in heat pump applications. Fig. 158. Schematic and hookup of T874G with Q674F. Used in heat pump applications. Fig. 159. Schematic and hookup of T874G with Q674J. Used in heat pump applications. Fig. 160. Schematic and hookup of T874G with Q674J. Used in heat pump applications. Fig. 161. Schematic and hookup of T874G with Q674J. Used in heat pump applications. Fig. 162. Schematic and hookup of T874G with Q674J. Used in heat pump applications. Fig. 163. Schematic and hookup of T874G with Q674C. Used in standard applications. Fig. 164. Schematic and hookup of T874H with Q674C. Used in standard applications. Fig. 165. Schematic and hookup of T874L with Q674C. Used in heat pump applications. Fig. 166. Schematic and hookup of T874D with Q674F. Used in standard applications. Fig. 167. Schematic and hookup of T874G with Q674F. Used in heat pump applications. Fig. 168. Schematic and hookup of T874R with Q674L. Used in heat pump applications. Fig. 169. Schematic and hookup of T874G with Q674F. Used in heat pump applications. Fig. 170. Schematic and hookup of T874G with Q674F. Used in heat pump applications. Fig. 171. Schematic and hookup of T874J with Q674J. Used in heat pump applications. Fig. 172. Schematic and hookup of T874H with Q674B. Used in heat pump applications. Fig. 173. Schematic and hookup of T874H with Q674C. Used in heat pump applications. Fig. 174. Schematic and hookup of T874G with Q674J. Used in heat pump applications. Fig. 175. Schematic and hookup of T874G with Q674J. Used in heat pump applications. Fig. 176. Schematic and hookup of T874G with Q674C. Used in standard applications. Fig. 177. Schematic and hookup of T874G,H with Q674C. Used in standard applications. Fig. 178. Schematic and hookup of T874N with Q674F. Used in heat pump applications. Fig. 179. Schematic and hookup of T874N with Q674F. Used in heat pump applications. Fig. 180. Schematic and hookup of T874A,D with Q674J. Used in heat pump applications. Fig. 181. Schematic and hookup of T874K with Q674C. Used in heat pump applications. Fig. 182. Schematic and hookup of T874R with Q674L. Used in heat pump applications. Fig. 183. Schematic and hookup of T874G with Q674J. Used in heat pump applications. Fig. 184. Schematic and hookup of T874A,F with Q674G. Used in standard applications. Fig. 185. Schematic and hookup of T874D with Q674E. Used in standard applications. Fig. 186. Schematic and hookup of T874D with Q674G. Used in standard applications. Fig. 187. Schematic and hookup of T874C with Q674B. Used in standard applications. Fig. 188. Schematic and hookup of T874D with Q674G. Used in standard applications. Fig. 189. Schematic and hookup of T874F with Q674D. Used in standard applications. Fig. 190. Schematic and hookup of T874C with Q674L. Used in heat pump applications. Fig. 191. Schematic and hookup of T874R with Q674B. Used in heat pump applications. Fig. 192. Schematic and hookup of T874D with Q674C. Used in standard applications. Fig. 193. Schematic and hookup of T874D with Q674E. Used in standard applications. Fig. 194. Schematic and hookup of T874G with Q674F. Used in heat pump applications. Fig. 195. Schematic and hookup of T874G with Q674F. Used in heat pump applications. Fig. 196. Schematic and hookup of T874G with Q674J. Used in heat pump applications. Fig. 197. Schematic and hookup of T874R with Q674L. Used in heat pump applications. Fig. 198. Schematic and hookup of T874L with Q674E. Used in standard applications. Fig. 199. Schematic and hookup of T874G with Q674F. Used in heat pump applications. Fig. 200. Schematic and hookup of T874R with Q674L. Used in heat pump applications. Fig. 201. Schematic and hookup of T874R with Q674L. Used in heat pump applications. Fig. 202. Schematic and hookup of T874D with Q674G. Used in standard applications. Fig. 203. Schematic and hookup of T874L with Q674C. Used in heat pump applications. Fig. 204. Schematic and hookup of T874D with Q674F. Used in standard applications. Fig. 205. Schematic and hookup of T874H with Q674C. Used in heat pump applications. Fig. 206. Schematic and hookup of T874J with Q674J. Used in heat pump applications. Fig. 207. Schematic and hookup of T874J with Q674L. Used in heat pump applications. Fig. 208. Schematic and hookup of T874D with Q674D. Used in standard applications. Fig. 209. Schematic and hookup of T874R with Q674L. Used in heat pump applications. Fig. 210. Schematic and hookup of T874Y with Q674E. Used in heat pump applications. Fig. 211. Schematic and hookup of T874G with Q674F. Used in standard applications. Fig. 212. Schematic and hookup of T874A with Q674E. Used in standard applications. Fig. 213. Schematic and hookup of T874L with Q674C. Used in heat pump applications. Fig. 214. Schematic and hookup of T874A with Q674B. Used in standard applications. Fig. 215. Schematic and hookup of T874L with Q674B. Used in heat pump applications. Fig. 216. Schematic and hookup of T874G with Q674J. Used in heat pump applications. Fig. 217. Schematic and hookup of T874N with Q674C. Used in heat pump applications. Fig. 218. Schematic and hookup of T874R with Q674L. Used in heat pump applications. Fig. 219. Schematic and hookup of T874C with Q674C. Used in standard applications. Fig. 220. Schematic and hookup of T874W with Q674C. Used in standard applications. Fig. 221. Schematic and hookup of T874H with Q674C. Used in heat pump applications. Fig. 222. Schematic and hookup of T874B with Q674E. Used in standard applications. Fig. 223. Schematic and hookup of T874S with Q674F. Used in heat pump applications. Fig. 224. Schematic and hookup of T874A,D with Q674E. Used in standard applications. Fig. 225. Schematic and hookup of T874D with Q674C. Used in standard applications. Fig. 226. Schematic and hookup of T874G with Q674G. Used in standard applications. Fig. 227. Schematic and hookup of T874G with Q674F. Used in heat pump applications. Fig. 228. Schematic and hookup of T874R with Q674L. Used in heat pump applications. Fig. 229. Schematic and hookup of T874G with Q674F. Used in heat pump applications. Fig. 230. Schematic and hookup of T874R with Q674L. Used in heat pump applications. Fig. 231. Schematic and hookup of T874G with Q674F. Used in heat pump applications. Fig. 232. Schematic and hookup of T874D with Q674G. Used in standard applications. Fig. 233. Schematic and hookup of T874W with Q674L. Used in heat pump applications. Fig. 234. Schematic and hookup of T874G with Q674B. Used in heat pump applications. Fig. 235. Schematic and hookup of T874G and Q674F. Used in heat pump applications. Fig. 236. Schematic and hookup of T874A-D with Q674C. Used in standard applications. Fig. 237. Schematic and hookup of T874C with Q674B. Used in standard applications. Fig. 238. Schematic and hookup of T874C with Q674F. Used in heat pump applications. Fig. 239. Schematic and hookup of T874R with Q674L. Used in heat pump applications. Fig. 240. Schematic and hookup of T874A with Q674W. Used in standard applications. Fig. 241. Schematic and hookup of T874J with Q674L. Used in heat pump applications. Fig. 242. Schematic and hookup of T874G with Q674C. Used in standard applications. Fig. 243. Schematic and hookup of T874G with Q674F. Used in heat pump applications. Fig. 244. Schematic and hookup of T874J with Q674J. Used in heat pump applications. Fig. 245. Schematic and hookup of T874R with Q674L. Used in heat pump applications. Fig. 246. Schematic and hookup of T874C with Q674G. Used in standard applications. Fig. 247. Schematic and hookup of T874W with Q674L. Used in heat pump applications. Fig. 248. Schematic and hookup of T874Y with Q674F. Used in heat pump applications. 60-24858 J.H. Rev. 3-01 www.hone y well.com Home and Building Control Home and Building Control Fig. 249. Schematic and hookup of T874C with Q674B. Used in heat pump applications.