238-47104-00A - Bradford White

SERVICE PROCEDURE RE-IVLight Duty CommercialThermostat TestingDouble Element, Non-Simultaneous, Single PhaseOperation.WARNINGHigh voltage exposure. Use caution to avoidpersonal injury during this procedure.Water In Tank Is Cold With Power ON.1. This procedure assumes line voltage, ECO andelements are in working order.2. Turn power “ON” to water heater.3. Set multi-meter to “Volts AC”.4. Check across terminals L4 and T2 ofupper thermostat (see illustration 29).A) Rated voltage NOT present,Recheck ECO (see page 14). IfECO is okay, replace thermostat.B) Rated voltage IS present,proceed to next step.5. Check across element terminals(see illustration 30).A) Rated voltage NOT present,check wire connections fromthermostat to element.B) Rated voltage IS present,Repeat element testingsee page 15. Illustration 29 Illustration 30Tank Does Not Deliver Enough Hot Water.1. This procedure assumes line voltage, ECO and elements are inworking order.2. Turn power “ON” to water heater and set multi-meter to “Volts AC”3. Adjust temperature setting of upper & lower thermostat to theHighest setting. Water temperature in tank must be below thermostatsetting for this test.4. See illustration 29 above. Check voltage across terminals L4 & T2 ofupper thermostat.A) Rated voltage IS present, okay, upper thermostat is callingfor heat. Go to step 5 below.B) Rated voltage NOT present, replace upper thermostat.5. Adjust temperature setting of upper thermostat to the minimumsetting. Water temperature in tank must be above thermostat settingfor this test.6. Check voltage across terminals L3 & T4 of upperthermostat (see illustration 31).A) Rated voltage NOT present, replace upper thermostat.B) Rated voltage IS present, upper thermostat is okay. Go tostep 7 on next page.Illustration 31Page 2525