Bryant Q674 manuals
Household Appliance > Thermostat
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Bryant Q674 Specifications
224 pages 4.31 Mb
PRODUCT DATA T874 Multistage Thermostats and Q674 SubbasesAPPLICATION FEATURES 2 ORDERING INFORMATIONSPECIFICATIONSSuper Tradeline/Tradeline ModelsSuper Tradeline Models Tradeline Models 3 Standard ModelsT874 MULTISTAGE THERMOSTATS AND Q674 SUBBASES 7 MERCURY NOTICEINSTALLATIONWhen Installing this Product Location Mount SubbaseT874 MULTISTAGE THERMOSTATS AND Q674 SUBBASES 8 Wire Subbase10 Outdoor DisconnectInstall and Adjust Stop Brackets Mount ThermostatDo not overtighten screws 11 SETTINGSSet the Heat Anticipator 12 Temperature SettingSubbase Setting Setting the Adjustable Differentialwider larger closer smaller closer larger wider smaller Verify the Adjustment 13 CHECKOUTHeating Cooling Fan Outdoor Reset Thermistor (Where Applicable)They do not have provision for field calibration. 14 CALIBRATION UNDERSTANDING CIRCUITS 21 OPERATIONHeat Anticipation/Cool Anticipationanticipates current anticipation voltage anticipation Interstage Differential Droop Outdoor Reset 22 Service and Replacement of C815A Outdoor ThermistorFeatures LED IndicatorsThis must be done during installation. Restricted Setpoint (DoD) Applications Changeover on Standard Residential Systems 23 Commercial Rooftop ApplicationHeat Pump Application Space Temperature Sensing Low Voltage Controls Two-Stage Thermostat whenever possible only when necessary balance point make sequentially 24 Cycling RateVoltage Anticipation Outdoor Reset Outdoor ResetHow it Works Changeoverautomatically manually manual automatic manual 25 Low Temperature LockoutsHeat Pumps with Dual Compressors Two speed Heat Pump 26 Defrost ControlDefrostingDefrost Control Functionsquipment safety economy of operation Auxiliary Heat Two-Stage Thermostat 27 Stage or Time Modulated ControlOutdoor thermostats time modulated thermostat jiggler Three-Stage Thermostat Emergency Heat Switching to Emergency Heatemergency heat second stage second heat relay is cycled first stage 28 Crankcase HeatCompressor Fault Relay 29 CROSS REFERENCE96 WIRING DIAGRAMSFig. 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. 97 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. 98 Fig. 48. Schematic and hookup of T874D with Q674B. Used in standard applications.99 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. 100 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 101 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. 102 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. 103 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. 104 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. 105 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. 106 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. 107 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. 108 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. 109 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. 110 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. 111 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. 112 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. 113 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. 114 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. 115 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. 116 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. 117 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. 118 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. 119 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. 120 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. 121 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. 122 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. 123 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. 124 Fig. 99. Schematic and hookup of T874C with Q674C. Used in standard applications. 125 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. 126 Fig. 102. Schematic and hookup of T874J,R with Q674L. Used in heat pump applications. 127 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. 128 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. 129 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. 130 Fig. 109. Schematic and hookup of T874R with Q674L. Used in heat pump applications. 131 Fig. 110. Schematic and hookup of T87C,R with Q674L. Used in heat pump applications. 132 Fig. 111. Schematic and hookup of T874R with Q674L. Used in heat pump applications. 133 Fig. 112. Schematic and hookup of T874R with Q674L. Used in heat pump applications. 134 Fig. 113. Schematic and hookup of T874R with Q674L. Used in heat pump applications. 135 Fig. 114. Schematic and hookup of T874D with Q674L. Used in heat pump applications. 136 Fig. 115. Schematic and hookup of T874R with Q674L. Used in heat pump applications. 137 Fig. 116. Schematic and hookup of T874R with Q674L. Used in heat pump applications. 138 Fig. 117. Schematic and hookup of T874D with Q674L. Used in heat pump applications. 139 Fig. 118. Schematic and hookup of T874W with Q674L. Used in heat pump applications. 140 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. 141 Fig. 121. Schematic and hookup of T874C with Q674L. Used in heat pump applications. 142 Fig. 122. Schematic and hookup of T874R with Q674L. Used in heat pump applications. 143 Fig. 123. Schematic and hookup of T874R with Q674L. Used in heat pump applications. 144 Fig. 124. Schematic and hookup of T874J with Q674L. Used in heat pump applications. 145 Fig. 125. Schematic and hookup of T874R with Q674L. Used in heat pump applications. 146 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. 147 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. 148 Fig. 130. Schematic and hookup of T874R with Q674L. Used in heat pump applications. 149 Fig. 131. Schematic and hookup of T874R with Q674L. Used in heat pump applications. 150 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. 151 Fig. 134. Schematic and hookup of T874R with Q674L. Used in heat pump applications. 152 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. 153 Fig. 137. Schematic and hookup of T874R with Q674L. Used in heat pump applications. 154 Fig. 138. Schematic and hookup of T874L with Q674B. Used in heat pump applications. Fig. 139. Schematic and hookup of T874D with Q674F. Used in heat pump applications.HEAT PUMP LED (GREEN) AUX. HT LED (RED) 1 2 4 6 8 10 11 Y2 G 155 Fig. 140. Schematic and hookup of T874W with Q674L. Used in heat pump applications. 156 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. 157 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. 158 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. 159 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. 160 Fig. 149. Schematic and hookup of T874C with Q674F. Used in heat pump applications. 161 Fig. 150. Schematic and hookup of T874G with Q674F. Used in heat pump applications. 162 Fig. 151. Schematic and hookup of T874G with Q674F. Used in heat pump applications. 163 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. 164 Fig. 154. Schematic and hookup of T874G with Q674F. Used in heat pump applications. 165 Fig. 155. Schematic and hookup of T874G with Q674F. Used in heat pump applications. 166 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. 167 Fig. 158. Schematic and hookup of T874G with Q674F. Used in heat pump applications. 168 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. 169 Fig. 161. Schematic and hookup of T874G with Q674J. Used in heat pump applications. 170 Fig. 162. Schematic and hookup of T874G with Q674J. Used in heat pump applications. 171 Fig. 163. Schematic and hookup of T874G with Q674C. Used in standard applications. 172 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. 173 Fig. 166. Schematic and hookup of T874D with Q674F. Used in standard applications. 174 Fig. 167. Schematic and hookup of T874G with Q674F. Used in heat pump applications. 175 Fig. 168. Schematic and hookup of T874R with Q674L. Used in heat pump applications. 176 Fig. 169. Schematic and hookup of T874G with Q674F. Used in heat pump applications. 177 Fig. 170. Schematic and hookup of T874G with Q674F. Used in heat pump applications. 178 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. 179 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. 180 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. 181 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. 182 Fig. 179. Schematic and hookup of T874N with Q674F. Used in heat pump applications. 183 Fig. 180. Schematic and hookup of T874A,D with Q674J. Used in heat pump applications. 184 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. 185 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. 186 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. 187 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. 188 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. 189 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. 190 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. 191 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. 192 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. 193 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. 194 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. 195 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. 196 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. 197 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. 198 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. 199 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. 200 Fig. 213. Schematic and hookup of T874L with Q674C. Used in heat pump applications. 201 Fig. 214. Schematic and hookup of T874A with Q674B. Used in standard applications. 202 Fig. 215. Schematic and hookup of T874L with Q674B. Used in heat pump applications. 203 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. 204 Fig. 218. Schematic and hookup of T874R with Q674L. Used in heat pump applications. 205 Fig. 219. Schematic and hookup of T874C with Q674C. Used in standard applications. 206 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. 207 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. 208 Fig. 224. Schematic and hookup of T874A,D with Q674E. Used in standard applications. 209 Fig. 225. Schematic and hookup of T874D with Q674C. Used in standard applications. 210 Fig. 226. Schematic and hookup of T874G with Q674G. Used in standard applications. 211 Fig. 227. Schematic and hookup of T874G with Q674F. Used in heat pump applications. 212 Fig. 228. Schematic and hookup of T874R with Q674L. Used in heat pump applications. 213 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. 214 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. 215 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. 216 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. 217 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. 218 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. 219 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. 220 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. 221 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. 222 Fig. 247. Schematic and hookup of T874W with Q674L. Used in heat pump applications.223 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 ControlPrinted in U.S.A. on recycled paper containing at least 10% post-consumer paper fibers. 224 Fig. 249. Schematic and hookup of T874C with Q674B. Used in heat pump applications.
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