{"id":1284,"date":"2014-02-07T20:36:32","date_gmt":"2014-02-07T20:36:32","guid":{"rendered":"https:\/\/bravocontrols.com\/?page_id=1284"},"modified":"2025-09-15T06:25:47","modified_gmt":"2025-09-15T06:25:47","slug":"reference","status":"publish","type":"page","link":"https:\/\/bravocontrols.com\/zh\/reference\/","title":{"rendered":"\u53c2\u8003"},"content":{"rendered":"

HVAC Wiring Reference<\/a>\"Color-coded<\/a>Features of Reference
\n<\/b><\/h3>\n
    \n
  • \u8054\u5408\u7535\u7f06\u6709\u4e00\u4e9b\u7279\u6b8a\u989c\u8272\u7684\u7535\u7ebf\u7528\u4e8e\u6052\u6e29\u5668\/\u6696\u901a\u7a7a\u8c03\u4f7f\u7528<\/li>\n
  • \u5b83\u53ef\u7528\u4e8e\u4e24\u5bfc\u4f53\u591a\u8fbe\u5341\u4e2a\u5bfc\u4f53\u7248\u672c<\/li>\n
  • \u9009\u62e920-ga\u3002\u8fd0\u884c\u957f\u8fbe250\u82f1\u5c3a\u9ad8\u8fbe4A\u548c18-ga\u3002\u8fd0\u884c\u8d85\u8fc7200\u82f1\u5c3a\u9ad8\u8fbe8A<\/li>\n<\/ul>\n

    Color-Coded Cable Reference<\/h3>\n

    This color-coded cable specifically supports thermostat\/HVAC use and helps you easily track which color wire operates each function (i.e. Black=Ground, Red=24VAC, White=Heat, Green=Fan, Yellow=Compressor, and so on). This reference helps installers and technicians maintain clarity and consistency during wiring, ensuring accurate connections and efficient system performance.<\/p>\n

    Conductor Requirements for Different Systems<\/h3>\n

    \u5bf9\u4e8e\u4ec5\u52a0\u70ed\u7cfb\u7edf\uff0c2\u5bfc\u4f53\u7535\u7f06\u901a\u5e38\u4f1a\u5b58\u5728\uff0c\u8fd9\u79cd\u60c5\u51b5\u4e0b\u7684\u6052\u6e29\u5668\u53ef\u4ee5\u662f\u6c34\u94f6\u5f00\u5173\u6216\u5176\u4ed6\u4e0d\u9700\u8981\u7535\u6e90\u7684\u673a\u68b0\u7c7b\u578b\u3002\u63d0\u4f9b\u52a0\u70ed\u6216\u51b7\u5374\u7684\u5927\u591a\u6570\u7cfb\u7edf\u5c06\u5177\u67094\u62165\u6839\u5bfc\u4f53\u7535\u7f06\u3002\u591a\u7ea7\u7cfb\u7edf\u9700\u8981\u9ad8\u8fbe7\u5bfc\u4f53\u7684\u7535\u7f06\u3002\u4f7f\u752820-ga\u3002\u8fd0\u884c\u9ad8\u8fbe250\u82f1\u5c3a\u9ad8\u8fbe4A\uff0c18-ga\u3002\u8fd0\u884c\u8d85\u8fc7200\u82f1\u5c3a\u9ad8\u8fbe8A\u3002<\/p>\n

    Notes on grounding: If no blue or black wire connects to a COM terminal, the thermostat is likely a mechanical or mercury bulb type that does not require power. It may also be a \u2018power stealing\u2019 type which doesn\u2019t require the ground or \u2018common\u2019 from the transformer since these types scavenge a very small amount of power that returns through the various outputs of the thermostat without actually turning on the equipment. Because Bravo communicating thermostats draw more power than can be scavenged, they must use a separate COM connection to the transformer<\/p>\n

    In a new installation, this is not a problem, but in an existing retrofit application you may need to run an extra conductor if there isn\u2019t a spare available in the existing cabling. Sometimes installers snip spare wires inside the wall, so check the cable all the way up to where the stripping starts for cut wires. Final note: since you are (probably) running a new communications cable to the Bravo communicating thermostat anyway, you will have a GND conductor on the RS485 cable which could be used, in which case you will tie the transformer for the particular HVAC equipment in with the network GND.<\/p>\n

    Notes on Grounding<\/h3>\n

    Notes on Existing Cabling: In a retrofit situation you will often see the Rc and Rh wires jumpered on an existing installation, in this case a single transformer powers both the heating and cooling equipment which is the most common type. If you see the Rh and Rc as separate conductors not jumpered at the thermostat, you can likely conclude that two separate transformers power the system\u2014one for heating and another for cooling.<\/p>\n

    This reference serves as a practical guide for selecting the right thermostat\/HVAC wiring, ensuring proper installation, grounding, and reliable system performance.<\/p>\n

    \n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
    \u7f16\u8f91<\/a><\/caption>\n
    \u6253\u6807<\/th>\n\u7ebf\u989c\u8272\uff08TYP\u3002\uff09<\/th>\n\u63cf\u8ff0<\/th>\n<\/tr>\n<\/thead>\n
    [R<\/td>\n\u7ea2<\/td>\n\u7535\u6e90\uff0c24 VAC\u53d8\u538b\u5668<\/td>\n<\/tr>\n
    RC<\/td>\n\u7ea2<\/td>\n\u6765\u81ea\u51b7\u5374\u7cfb\u7edf\u7684\u7535\u6e90\uff0c24 VAC\u53d8\u538b\u5668<\/td>\n<\/tr>\n
    \u94d1<\/td>\n\u7ea2<\/td>\n\u6765\u81ea\u52a0\u70ed\u7cfb\u7edf\u7684\u7535\u6e90\uff0c24 VAC\u53d8\u538b\u5668<\/td>\n<\/tr>\n
    C<\/td>\n\u9ed1\u84dd<\/td>\n24 VAC\u53d8\u538b\u5668\u901a\u7528<\/td>\n<\/tr>\n
    w ^<\/td>\n\u767d\u8272<\/td>\n\u4e3b\u8981\u70ed\u547c\u53eb\u7ee7\u7535\u5668<\/td>\n<\/tr>\n
    \u00cb<\/td>\n\u68d5\u8272<\/td>\n\u7d27\u6025\u7ee7\u7535\u5668<\/td>\n<\/tr>\n
    \u00ff<\/td>\n\u9ec4\u8272<\/td>\n\u4e3b\u8981\u9177\u547c\u53eb\u4e2d\u7ee7<\/td>\n<\/tr>\n
    Y2<\/td>\n\u9ec4\u8272<\/td>\n\u4e8c\u7ea7\u51b7\u547c\u53eb\u7ee7\u7535\u5668<\/td>\n<\/tr>\n
    G<\/td>\n\u7eff\u8272<\/td>\n\u98ce\u6247\u7ee7\u7535\u5668<\/td>\n<\/tr>\n
    \u00d8<\/td>\n\u6a59\u5b50<\/td>\n\u5207\u6362\u7ee7\u7535\u5668\u4ee5\u51b7\u5374\u7ee7\u7535\u5668<\/td>\n<\/tr>\n
    \u4e59<\/td>\n\u84dd\u8272<\/td>\n\u5207\u6362\u7ee7\u7535\u5668\u52a0\u70ed\u7ee7\u7535\u5668<\/td>\n<\/tr>\n
    \u4e00\u4e2a<\/td>\n<\/td>\nHeat\uff06Cool\u6d3b\u52a8\u5230\u4efb\u4f55\u7ee7\u7535\u5668<\/td>\n<\/tr>\n
    \u5927\u53f7<\/td>\n<\/td>\n\u5e94\u6025\u70ed\u6d3b\u52a8\u706f<\/td>\n<\/tr>\n
    X<\/td>\n<\/td>\n\u7cfb\u7edf\u6545\u969c\u6307\u793a\u706f<\/td>\n<\/tr>\n
    P<\/td>\n<\/td>\n\u9664\u971c\u63a7\u5236\u706f<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>","protected":false},"excerpt":{"rendered":"

    HVAC Wiring ReferenceFeatures of Reference Allied Cable has some wire specially color coded for thermostat\/HVAC use It is available in two-conductor up to ten-conductor versions Choose 20-ga. for runs up to 250 ft. up to 4A and 18-ga. for runs over 200 ft. up to 8A Color-Coded Cable Reference This color-coded cable specifically supports thermostat\/HVAC<\/p>","protected":false},"author":1,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"open","template":"","meta":{"_acf_changed":false,"publish_to_discourse":"","publish_post_category":"","wpdc_auto_publish_overridden":"","wpdc_topic_tags":"","wpdc_pin_topic":"","wpdc_pin_until":"","discourse_post_id":"","discourse_permalink":"","wpdc_publishing_response":"","wpdc_publishing_error":"","footnotes":""},"acf":[],"yoast_head":"\nReference - Bravo Controls<\/title>\n<meta name=\"description\" content=\"Allied Cable reference guide for thermostat\/HVAC wiring, conductor choices, grounding, and retrofit installation tips\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/bravocontrols.com\/zh\/reference\/\" \/>\n<meta property=\"og:locale\" content=\"zh_CN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Reference\" \/>\n<meta property=\"og:description\" content=\"Allied Cable reference guide for thermostat\/HVAC wiring, conductor choices, grounding, and retrofit installation tips\" \/>\n<meta property=\"og:url\" content=\"https:\/\/bravocontrols.com\/zh\/reference\/\" \/>\n<meta property=\"og:site_name\" content=\"Bravo Controls\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/bravocontrols\" \/>\n<meta property=\"article:modified_time\" content=\"2025-09-15T06:25:47+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/bravocontrols.com\/wp-content\/uploads\/2014\/02\/cable.gif\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:site\" content=\"@bravo_controls\" \/>\n<meta name=\"twitter:label1\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data1\" content=\"3 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\/\/bravocontrols.com\/reference\/\",\"url\":\"https:\/\/bravocontrols.com\/reference\/\",\"name\":\"Reference - 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