Évaluations - 4, GPA: 3.5
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d) Route the other end of the BVS harness to the ignition module . Connect the fully insulted quick connect to the “24 Volt” terminal. Connect the uninsulated connector to the “24 V Ground” piggy back terminal. Secure the BVS harness to the jacket with the nylon clips provided as shown in Figure D. e) If a damper is installed, remove the red jumper wire inside the junction box that is indicated by Note #2 in Figure A. Connect the damper harness to the wiring in the junction box as shown in Figure A. Route the damper harness to the damper as shown in Figure D, using care to make sure that it does not come in contact with the draft hood or steam piping. f) If a redundant LWCO and/or pressure limit are used, wire them so that they interrupt 120VAC power to the boiler. 2) Water Boiler wiring is shown in Figure B for boilers without a tankless heater and in Figure C for boilers with a tankless heater. The blocked vent switch (BVS) wire harness is factory wired to B1 and B2 on the “aquastat” (L8148E or L8124E). a) Mount the aquastat to the control well. b) Mount the blocked vent switch (BVS) to the draft hood as shown in Figure E using two #10 x 1/2” sheet metal screws. Route the red BVS harness along the side of the boiler as shown in Figure F and connect the pair of fully insulated quick connects to the BVS. c) Route the other end of the BVS harness to the ignition module . Connect the fully insulated quick connect to the “24 Volt” terminal. Connect the uninsulated connector to the “24 V Ground” piggy back terminal. Secure the BVS harness to the jacket with the nylon clips provided as shown in Figure F. d) A vent damper cannot be used on boilers equipped with tankless heater. If a damper is installed on a boiler without the tankless heater, remove the jumper plug inside the L8148E aquastat. Plug the 6-pole end of the damper harness into the aquastat. Plug the 4-pole end of the harness into the damper. Route the damper harness to the damper as shown in Figure F, using care to make sure that it does not come in contact with the draft hood. e) If a LWCO and/or redundant temperature limit are used, wire them so that they interrupt 120VAC power to the boiler. 3) Provide a Class II circuit between the boiler and the thermostat. Make thermostat connections to the boiler in accordance with Figure A-C. 4) Make 120VAC connections to the boiler in accordance with Figure A-C. CAUTION Make sure that damper and BVS harnesses are secured so that they do not come in contact with draft hood or steam piping. 3 “BURNER” “BURNER” TH TR + ROBERTSHAW 7000DERHC GAS VALVE VENT DAMPER (NOTE 2) NOTE 2 LESS VENT DAMPER 2. ON BOILERS LESS VENT DAMPER, DAMPER HARNESS NOT USED. RED AND BLUE LEADS ARE JUMPED TOGETHER USING RED JUMPER WIRE. RD RD RD ALARM ALARM 2 (NOTE 2) 2. WHEN DAMPER IS NOT USED, DAMPER HARNESS IS REPLACED WITH JUMPER PLUG. PILOT VALVE MAIN VALVE TH TR + ROBERTSHAW 7000DERHC GAS VALVE RD RD RD/YE RD/YE - RED with YELLOW TRACE RD BL ALARM ALARM RD/YE Figure B: Water Boiler Wiring (Less Tankless Heater) 4 Figure A: Steam Boiler Wiring Sequence of Operation - Steam Boiler 1) When the boiler is energized, 24 volts is immediately applied to terminals “1” (blue) and “4” (yellow) on the vent damper. Assuming that there is no call for heat, and that the damper switch is in the “automatic” position, the damper will close. On boilers equipped with Hydrolevel CG400A probe type low water cut-offs, voltage is also always applied to terminals “1” (blue) and “2” (yellow) on the low water cut-off to power the water level sensing circuit. 2) Assuming that water is above the cut-off level, power will appear at terminal “3” on the CG400 LWCO or terminal “1”. 3) Assuming that steam pressure is below the pressure limit setting, power will appear on one side of relay contact 1R1 (Gray lead). Relay 1R is the R8225 mounted under the junction box. 4) A call for heat from the thermostat energizes relay coil 1R causing contacts 1R1 to make. Current then flows through contacts 1R1 to pin terminal “2” (orange) at the vent damper (if used) and the damper opens. 5) Once the vent damper is fully open, an end switch inside the damper will make, energizing pin “3” (red) at the damper. If a vent damper is not present, current flows through the red jumper indicated by Note 2 in Figure A directly to the blocked vent switch. 6) Current passes from terminal “3” on the vent damper through the blocked vent switch. Under normal conditions, this switch is made and voltage will therefore immediately appear across terminals “24V” and “24V (GND)” on the ignition module. 7) Upon application of voltage across the “24V” and “24V (GND)” terminals, the ignition module will start an ignition spark at the pilot and apply 24 volts across the pilot valve (terminals “PV” and “MV/PV”). 8) Once the pilot is established, the pilot flame will act as a diode, converting the AC current at the electrode to a half wave DC current at the pilot’s ground strap. This DC current flows throu...
Ce manuel est également adapté pour les modèles :Chauffe-eau - 32-475ECS (1.64 mb)