Assessments - 5, GPA: 4.2
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DUAL LEVEL CONTROL - switches power to both the thermostat and water inlet solenoid valve by sensing changes in water level. 3. METAL ENCLOSURE -provides a common (ground) connection for the (TANK BODY) electrode circuit. 2. ELECTRODE ASSEMBLY - TRANSFORMER RELAYS FILL HEAT M N 120VAC PROBES HI XL C PRINTED CIRCUIT consists of a high (short) and a low (extra long) sensing electrode, or probe, molded in an epoxy body. HIGH RED WIRE GREEN WIRE RED WIRE HIGH LOW GREEN WIRE LOWSIDE MOUNTED PROBESTOP MOUNTED PROBES American Metal Ware Hot Water Boiler Page 6 II) Description and Operation of Dual Level Control System (continued) B. Operation Water Level Action 1) Both “HI” and “XL” electrode circuits open. 2) Rises to low electrode above heater coils 2) “XL” electrode circuit closes. Power to thermostat turned on. Power to fill valve 3) “HI” electrode circuit closes. Dual Level Control turns power off to fill valve and continues power to thermostat. 4) Falls below high electrode only 4) “HI” electrode circuit opens. “XL” circuit stays closed. After a few seconds delay, power to fill valve is turned on. 5) Falls below low electrode (Same as condition no. 1) 5) “XL” electrode circuit now opens. Power to thermostat is turned off. Power to fill valve remains on. 1) Below both electrodes Dual Level Control turns power on to fill valve and keeps power off to thermostat. Thermostat Fill Solenoid Valve OFFON O 3) Rises to high electrode remains on. Thermostat Fill Solenoid Valve ONON O O Thermostat Fill Solenoid Valve ONOFF O Thermostat Fill Solenoid Valve ONON III) Quick Service Check of Dual Level Control System: 1) All wire secure and properly connected. 2) Clean the electrodes. Lime (mineral scale) build-up can interfere with the operation of any liquid level control system. 3) Check the common (ground) connection. A little looseness or dirt can cause erratic operation. Page 7 American Metal Ware Hot Water Boiler IV) Trouble Shooting Auto Refill, Low Water Cutoff, and Dual Level Control System PROBLEM POSSIBLE CAUSE SERVICE CHECK REMEDY A) Overfilling of watertank when power isoff. 1) Fill solenoid valve leakingdue to dirt or scale holdingvalve open, or wornplunger seat. Visual. Water enteringtank continuously, andusually slowly. Disassemble and clean out. Mayrequire new plunger assembly. Cautionis advised to avoid damage to valve.See valve instruction sheet. 2) Fill solenoid valveinstalled backwards. Visual. On valves without integral strainer:Install so that port marked “IN” isconnected to outside fresh watersupply.On valves with integral strainer:Install so that arrow points indirection of tank, away from freshwater supply. B) Overfilling of watertank only when powerto unit is on. 1) High electrode coatedwith scale, or faulty. Jumper from “HI” terminalto metal enclosure stopsfill. Remove electrode assembly. Clean bothelectrodes. If still no remedy andconnections are good, replace assembly. 2) Missing or faultycommon connection forelectrode circuit (“C”terminal to metal enclosure). Jumper “C” terminal(next to XL) to metal enclosure stops fill. Make good secure connection. Mayrequire cleaning or replacement. 3) Fill valve connected to“HEAT” terminal. Visual. Connect “BLACK” wire lead to “FILL” terminal. 4) Dual Level printedcircuit board faulty. Jumper from “HI” to “C” does not stop fill. Replace Dual Level Control. C) Auto refill fails tofill water tank. 1) No power at equipment. Nothing operates onmachine. Make sure main switch(es), fuse(s),circuit breaker(s) provide power tounit, that machine’s circuitbreaker is OK and power switch, ifprovided, is on. 2) No water at equipment. “Crack” fitting atwater inlet for pressurecheck. Make sure all water supply linevalves are open. American Metal Ware Hot Water Boiler Page 8 IV) Trouble Shooting Auto Refill, Low Water Cutoff, and Dual Level Control System (continued) PROBLEM POSSIBLE CAUSE SERVICE CHECK REMEDY C) Auto refill fails tofill water tank(continued). 3) Water strainer clogged. Water pressure beforestrainer and not after. Remove and clean micromesh screenfilter located in water strainer. 4) No power on DualLevel Control. Check for 120V AC across“H” and “N” terminals. If voltage missing or incorrect, check wiring for looseness, breaks,and proper connections. 5) Fill solenoid valveclogged with scaleor frozen closed. Disassemble. Clean out and/or replace plungerassembly or entire valve. May requirenew coil. Caution is advised to avoiddamage to valve. See valve instructionsheet. 6) Fill solenoid valvecoil inoperativeJumper from “FILL”terminal to “H” terminaldoes not start fill. Replace coil. Also check for frozenplunger. See valve instruction sheet. 7) Electrodes shorting toground. Tank fills with electrodewire disconnected from“HI” terminal. Replace electrode assembly. If noremedy, check for improper wiring(cut insulation) or electrode tips touching metal. 8) Dual Level Controlfaulty. Tank does not fillwith electrode wiredisconnected from “HI”terminal. Replace Dual L...
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