238-47104-00A - Bradford White

SERVICE PROCEDURE RE-IVLight Duty CommercialThermostat TestingDouble Element, Simultaneous, Three PhaseOperation.Water In Tank Is Cold Or Not Enough HotWater With Power ON.1. This procedure assumes line voltage,ECO and elements are in working order.2. Adjust temperature setting for boththermostats to the highest setting.3. Turn power “ON” to water heater.4. Set multi-meter to “Volts AC”5. Check across terminals L4 and T2 ofupper thermostat (see illustration 47).A) Rated voltage NOT present,Recheck upper ECO(see page 14). If ECOis okay, replace upper thermostat.B) Rated voltage IS present,proceed to next step.6. Check across upper element terminals(see illustration 48).A) Rated voltage NOT present,check wire connections fromthermostat to upper element.B) Rated voltage IS present,Repeat element testingsee page 157. Check across terminal L4 of upper thermostatand T2 of lower thermostat (see illustration 49).A) Rated voltage NOT present,Check ECO (see page 14) & wireconnections at upper & lowerthermostats. If okay, replacelower thermostat.B) Rated voltage IS present,proceed to next step.8. Check across lower element terminals(see illustration 50).A) Rated voltage NOT present,check lower element wireconnections to thermostat.B) Rated voltage IS present,Repeat lower element testingsee page 15.WARNINGHigh voltage exposure. Use caution to avoidpersonal injury during this procedure.Illustration 47 Illustration 48WARNINGBe sure thermostats are reset totheir original temperature settingsas found prior to thermostattestingIllustration 49Page 31Illustration 5031