Assessments - 3, GPA: 4
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O. Smith Water Products Company. REMOVING SILICATE Ammonium bifluoride flakes (NH4F HF) can be used in conjunction with delimer to delime and remove siliceous materials from copper coil water boilers. Ammonium bifluoride flakes should be purchased locally from chemical suppliers. 56 5656565656 PRE-TROUBLESHOOTING Before any extensive trouble-shooting, perform the following: Ensure That: — Voltage (120 vac) is supplied to the appliance. — System control (tank temperature control, thermostat, etc.) is calling for appliance operation (call for heat). — Other contacts (switches) are closed (relay, low water cutoff, flow switch, coil protector, pressure switch, etc.). — Gas supply pressure is within the maximum and minimum operating ranges listed on the appliance rating plate/label. — Voltage (24 vac) is supplied by transformer. — Appliance is wired according to wiring diagram. Note: Cross wiring the 24 volt circuit of the relay will short the transformer. — All wire terminals/connectors are firmly attached to valves, modules, switches, limit controls, etc. — For LP models only check for possible lockout condition of the ignition module. TROUBLESHOOTING CER-TEMP 80 RECOVERY SYSTEM CHECKOUT PROCEDURE Use this checkout for Cer-Temp 80 Recovery Systems. (For hot water supply application only) Checkout Sequence SYSTEM OPERATION Cause RemedyContact Incorrect Set tank temperature control (thermostat) 20°F (10°C) below tank water temperature Circulating pump and burner shut off. With thermal balancer, pump off delay of approximately 2 minutes. Pump and burner remain on. Tank temperature control (thermostat) defective. Replace. System wiring is incorrect. Correct wiring. Circulating pump on. Pump wired for continuous operation. Correct wiring. Burner on. Gas valve stuck or defective. Correct or replace valve. System wiring is incorrect. Correct wiring. Set tank temperature control (thermostat) 20°F (10°C) above tank water temperature. Circulating pump and burner on. Circulating pump on. High limit control set too low. Replace. (If problem proven to be at this control by applying jumper to terminals.)High limit control differential too wide. System wiring is incorrect. Correct wiring. Coil protector switch has activated. Remove control cover, depress reset button. Gas valve or wiring defective. Check wiring. Repair or replace valve. Circulating pump and burner off. Power off or system wiring is incorrect. Check power supply and wiring. Tank temperature control (thermostat) defective. Replace. Burner on. System wiring is incorrect. Correct wiring. Boiler outlet temperature exceeds 210°F (100°C). Circulating pump on. Circulating pump and burner on. High limit control defective, or set too high (max. should be set at 200°F). Replace. Set tank temperature control (thermostat) for desired water temperature. System maintains. desired water temperature. 57 5757575757 CHECKING HONEYWELL S-8600H OR S-8610M INTERMITTENT IGNITION CONTROLS NO SPARK AT PILOT BURNER Turn off gas supply. Is voltage (24 Vac) across the 24 V terminals on module during “Call for heat”? Turn off power supply. Is ignition cable firmly plugged into pilot assembly and module? Is ground wire firmly attached to pilot assembly and GND terminal on module? Ensure ground strap is the closest metal to the igniter/sensor rod (electrode) to prevent the spark from shorting out to other metal parts (pilot screen, pilot shield, etc.). Ignition cable must not touch metal surfaces or current carrying wires. Is there a 1/8” gap between ground strap and electrode? Is the ceramic insulator surrounding the electrode cracked or broken? Replace ignition module. Turn on gas supply. turn on power supply. Securely connect cable and/or ground wire. Carefully bend downward top of ground strap to achieve 1/8” spark gap. Replace Ignition Module. YES NO YES YES NO NO NO Is voltage (24 Vac) across the PV & MV/PV terminals on “call for heat”? YES NO NOTE: S8610M will automatically reset every 5 minutes. S8600H pilot valve will be de-energized if module goes into lockout condition. Reset system by turning electrical power off or by turning system controller to off or down below "call for heat". Wait one minute, then turn system on. YES Are ignition cable and ground wire in good condition (not brittle, burnt or cracked)? Replace pilot burner and/or ground wire. YES NO YES Replace pilot burner assembly. 58 5858585858 CHECKING HONEYWELL S8600H OR S-8610M INTERMITTENT IGNITION CONTROLS SPARK AT PILOT BURNER BUT PILOT WILL NOT LIGHT Attach wires firmly. Replace gas valve. Ensure all manual shutoff valves are fully open; All filters are clean; All gas connections are gas tight; Pilot tubing is not damaged, obstructed or kinked; and pilot orifice is unclogged. Check for air in gas line, purge (bleed) line if necessary. YES Are the wires securely attached to the pilot operator on the gas control and to the PV & MV/PV terminals on the ignition module? YES NO Install a pressure gauge in the pilot tu...
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