0 5 20 25 30 10 15 0 .25 .50 .75 1.0 M B M B M B M B M B M B M B M B 0 5 20 25 30 10 15 0 5 20 25 30 10 15 CALIBRATION BOARD MAIN AIR BRANCH LINE SWITCH LINE JC T400 JC T4000 BACK PLATE BACK PLATE POWERS “D” STAT POWERS 180 BACK PLATE BACK PLATE HONEYWELL TP970 HONEYWELL TP910 BACK PLATE BACK PLATE BC TK1301 SIEMENS 192 BACK PLATE BACK PLATE MAIN AIR ON SWITCH FLOW PRV OFF METER Connect the main air (blue line) and the branch line (green line) to the M and B fittings for the type of thermostat you are about to calibrate. Connect the switch line (red line) to the third line of three pipe thermostats for calibration. The back plates illustrated must be replaced for the type of back plates suiting the thermostats you calibrate. 3.22
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