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COMMERCIAL ELECTRIC ENERGY SAVER
IMMERSION AND SURFACE MOUNTED
Manual 238-47174-00B
WATER HEATER
MII SERIES
THERMOSTAT MODELS
SERVICE
MANUAL
Troubleshooting Guide
and Instructions for Service
(To be performed ONLY by
qualified service providers)
Models Covered
by This Manual:
MII50(A)-*-**-(SF,CF,SCF)-***
MII80(A)-*-**-(SF,CF,SCF)-***
MII120(A)-*-**-(SF,CF,SCF)-***
*Denotes kW Rating
**Denotes Warranty Years
***Denotes Wiring Code
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Table of Contents
Related Manuals for Bradford White MII120 CF Series
Summarization of Contents
General Information
Model Number Coding
Explains how model numbers identify control systems, ratings, and features of the water heater.
Contactor Models General Controls Layout
Diagram and labels for the control layout of contactor models, detailing component locations.
Surface Mounted Thermostat Models General Controls Layout
Diagram and labels for the control layout of surface mounted thermostat models.
600V Surface Thermostat (w/Contactors) General Controls Layout
Diagram and labels for the control layout of 600V surface thermostat models with contactors.
Surface Mounted Thermostats Operation
Explains how surface mounted thermostats are mounted and function to sense tank temperatures.
Immersion Style Thermostat Control for Contactor Models
Explains the operation of immersion style thermostats in contactor models for temperature control.
Immersion Style High Limit (ECO) Control for Contactor Models
Explains the operation of the immersion style high limit (ECO) control for safety shutoff.
Surface Mounted Thermostats (w/Contactors) for 600V Models
Explains the use of surface mounted thermostats with contactors for 600V models.
Contactor Operation
Explains how contactor operation is achieved by energizing an operating coil in response to a call for heat.
Direct Immersion 'Screw-in' Type Heating Element
Details the features and identification of the direct immersion screw-in type heating element.
Full Load Current Amps
Table showing full load current (amps) for various kW ratings and voltages.
Sequence of Operation
Immersion Thermostat (Contactor Models) Sequence of Operation
Explains the sequence of operation for immersion thermostat models, covering power and control circuits.
Surface Mounted Thermostats Sequence of Operation
Details the step-by-step operational sequence for surface mounted thermostats.
600V Surface Mounted Thermostats (w/Contactors) Sequence of Operation
Explains the operational sequence for 600V surface mounted thermostats with contactors.
Troubleshooting
Common Heating Element Failures
Lists common failures like dry firing, grounded elements, and sediment build-up affecting heating elements.
Quick Step Plan to Hot Water
A rapid troubleshooting guide for diagnosing and resolving no hot water issues.
Service Procedure MCE-I
Test for Open or Burned Out Element
Procedure to test heating elements for being open or burned out using an ohm meter.
Test For Grounded Heating Element
Procedure to test heating elements for a short circuit to ground.
Service Procedure MCE-II
Single Phase Line Voltage Testing
Procedure to test line voltage for single-phase connections to the water heater.
Three Phase Line Voltage Testing
Procedure to test line voltage for three-phase connections to the water heater.
Service Procedure MCE-III
Fuse Testing
Procedure for testing fuses for continuity to determine if they are operational.
Service Procedure MCE-IV
High Limit Control (ECO) Testing for Surface Thermostat models (not including 600V)
Procedure to test the High Limit (ECO) control on surface thermostat models, excluding 600V units.
Service Procedure MCE-V
High Limit Control (ECO) Testing for 600V Surface Thermostat Models
Procedure to test the High Limit (ECO) control on 600V surface thermostat models.
Service Procedure MCE-VI
High Limit Control (ECO) Testing for Contactor Models
Procedure to test the High Limit (ECO) control for contactor models.
High Limit Control Continuity Testing for Contactor Models
Procedure to test the continuity of the High Limit (ECO) control for contactor models.
Service Procedure MCE-VII
Surface Mounted Thermostat. Operation Testing (not including 600V models)
Procedure to test the operation of surface mounted thermostats (non-600V models).
Water Temperature In Tank Is Above Thermostat Setting
Procedure for testing thermostat operation when water temperature is above the set point.
Service Procedure MCE-VIII
600V Surface Mounted Thermostat Models. Operation Testing
Procedure to test the operation of 600V surface mounted thermostat models.
Water Temperature In Tank Is Above Thermostat Setting
Procedure for testing thermostat operation when water temperature is above the set point.
Service Procedure MCE-IX
Immersion Thermostat Operation Testing
Procedure to test the operation of immersion thermostats.
Thermostat Control Continuity Testing
Procedure to test the continuity of immersion thermostat controls.
Service Procedure MCE-X
Noisy Contactor
Discusses causes and troubleshooting for noisy contactor operation.
Contactor Operating Coils
Information on different contactor operating coils and their identification.
Contactor Operation Testing
Procedure to test the operation of contactors.
Service Procedure MCE-XI
Surface Mounted Thermostat Removal
Step-by-step guide for safely removing surface mounted thermostats.
Surface Mounted Thermostat Replacement
Step-by-step guide for correctly replacing surface mounted thermostats.
Service Procedure MCE-XII
Immersion Thermostat Removal & Replacement
Procedure for safely removing and replacing immersion thermostats.
Service Procedure MCE-XIII
Contactor Model High Limit (ECO) Control Removal and Replacement
Procedure for removing and replacing the ECO control on contactor models.
Service Procedure MCE-XIV
600V Surface Thermostat Model High Limit (ECO) Control Removal and Replacement
Procedure for removing and replacing ECO control on 600V surface thermostat models.
Service Procedure MCE-XV
Heating Element Removal
Steps for safely removing a heating element from the water heater.
Heating Element Replacement
Steps for correctly installing a new heating element.
Service Procedure MCE-XVI
Anode Inspection and Replacement
Procedure for inspecting and replacing the water heater anode rod.
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