Table of Contents
Advertisement
COMMERCIAL ELECTRIC ENERGY SAVER
ASME SERIES IMMERSION THERMOSTAT
Manual 238-47202-00A
WATER HEATER
WITH CONTACTORS
SERVICE
MANUAL
Troubleshooting Guide
and Instructions for Service
(To be performed ONLY by
qualified service providers)
Models Covered
by This Manual:
6A, 12A, 20A, 30A, 40A, 50A, 80A, 120A
Save this manual for future reference
Advertisement
Table of Contents
Subscribe to Our Youtube Channel
Related Manuals for Bradford White 6A
Summary of Contents for Bradford White 6A
- Page 1 ASME SERIES IMMERSION THERMOSTAT WITH CONTACTORS SERVICE MANUAL Troubleshooting Guide and Instructions for Service (To be performed ONLY by qualified service providers) Models Covered by This Manual: 6A, 12A, 20A, 30A, 40A, 50A, 80A, 120A Manual 238-47202-00A Save this manual for future reference...
-
Page 2: Table Of Contents
The text and illustrations in this manual provide step by step instructions to facilitate proper operation and troubleshooting procedures. Contact the Bradford White Technical Support Group immediately if diagnosis can not be made using the methods described in this service manual. -
Page 3: General Information
- Phase - Amp Rating Warranty In the Field, this information is obtained from the heaters rating plate kW Rating Tank BRADFORD WHITE CORPORATION 200 LAFAYETTE ST. MIDDLEVILLE MI 49333 Model Number Model No: 120A-24-3-108B-BBG Serial No: ZB2564812 Cap. 120(gal.)/454.2(liters) Press:... - Page 4 GENERAL INFORMATION General Controls Layout Control Circuit Control Circuit Fuse Block Transformer Terminal strip Pressure Gage Terminal (optional) Block High Pressure Limit Switch Power Circuit (optional) Fuse Blocks Thermostat Low Pressure Control Contactors Limit Switch Heating Element (optional) Time Delay Low Water Sequencers Level Control...
- Page 5 GENERAL INFORMATION Standard Controls (continued) Immersion Style Thermostat Control The thermostat will complete control circuit voltage upon a call for heat. Likewise, the control will interrupt control circuit voltage when the water Immersion Thermostat Control temperature is sufficient to satisfy the adjustable temperature limit of control.
- Page 6 GENERAL INFORMATION Standard Controls (continued) Direct Immersion “Screw-in” Type Heating Element 2-1/8 Hex Terminal Block Screw-in Flange Zinc Plated Copper or Incoloy Sheath Terminal Block Screw Element Rating Ink Stamped on face of Terminal Block. Optional Controls Certain control components are available as “Optional“. When these optional components are installed with the water heater, the control circuit wiring diagram accordingly will include these components.
- Page 7 GENERAL INFORMATION Optional Controls (continued) Low Water Level Control- This control will interrupt the electrical current to the contactor coil when a low water level condition is sensed inside the water heater tank. When the low water level condition is corrected the control will automatically sense the new situation and electrical current will again energize the contactor coil.
- Page 8 GENERAL INFORMATION Optional Controls (continued) Electrical Door lock- An electrical door lock is offered in order to secure the access to the water heater control cabinet. This device will lock the control cabinet door when the 120VAC control circuit voltage is applied to it. Note: Once the door is opened, the water heater can be re-energized, if necessary, for service diagnosis.
- Page 9 GENERAL INFORMATION Commonly Used Formulas (balanced 3 phase) (Single phase) Watts Watts Volts Amps = Watts = Amps x Volts Ohms = Amps = Watts Volts x 1.732 Volts Common Service Wire 240V 1Ph Configurations BLACK GREEN Ungrounded Grounding Ungrounded 208 3Ph 240 3Ph 480 3Ph/277 1Ph...
-
Page 10: Sequence Of Operation
SEQUENCE OF OPERATION This water heater has two distinct electrical systems. One system, referred to as the “Control Circuit”, controls the water heater operation, while the other system referred to as the “Power Circuit”, connects the electrical power to the heating elements, The electrical contactors interconnect these two systems. - Page 11 SEQUENCE OF OPERATION Control Circuit Sequence (Continued)- Certain other control components are available as “Optional“. These controls are specified when the installation has unique requirements that must be safeguarded. When these optional components are installed the control circuit wiring diagram accordingly will include these components. The optional equipment available from the manufacturer includes the following: High Water Pressure Switch Low Water Pressure Switch...
- Page 12 SEQUENCE OF OPERATION Power Circuit Description- The Power Circuit Wiring Diagram illustrates the electrical connections from the incoming power supply through the contactors to the heating elements. The power circuits are available with internal circuit fusing and without internal circuit fusing. As it would be impractical to show all wired configurations in this service manual, a reference wiring diagram is illustrated below to aid in the understanding of the power circuit operating sequence.
-
Page 13: Troubleshooting
TROUBLESHOOTING Most common cause for improper electric water heater operation can be linked to heating element failure. When troubleshooting an electric water heater with the incidence of “No Hot Water” or “Insufficient Amount of Hot Water” It is always a good idea to check the heating elements first following the procedure on page 15. Common Heating Element Failures Are: 1. - Page 14 TROUBLESHOOTING Quick Step Plan to Hot Water WARNING High voltage exposure. Use caution when 1. STOP, DANGER! Turn power “OFF” to water heater. making voltage checks to avoid hazard to life or property. 2. Check all wire connections to insure they are snug and corrosion free.
-
Page 15: Heating Element Testing
SERVICE PROCEDURE ACE-I Heating Element Testing Test for Open or Burned Out Element. DANGER High voltage exposure. To avoid hazard to 1. STOP, DANGER! Turn power “OFF” to water heater. Life or property, be sure power is turned 2. Open control panel access door. OFF to water heater while performing this procedure. -
Page 16: Line Voltage Testing
SERVICE PROCEDURE ACE-II Line Voltage Testing DANGER Line Voltage Testing High voltage exposure. To avoid hazard to Line voltage (single phase or three phase) will life or property use extreme caution when connect to a terminal block or directly to a fuse block making voltage checks . -
Page 17: Fuse Testing
SERVICE PROCEDURE ACE-III Fuse Testing Fuse Testing DANGER High voltage exposure. To avoid hazard to Life or property, be sure power is turned OFF to water heater while performing this procedure. 1. STOP, DANGER! Turn power “OFF” to water heater. 2. -
Page 18: High Limit (Eco) Testing
SERVICE PROCEDURE ACE-IV High Limit Control Testing High Limit Control (ECO) Operation Switch Contacts: Observe heating cycle. Is water temp Normally closed. Does switch open? over 196°F Open on rise @ 196°F ±4°F Manual Reset. 1. Determine if Hi-Limit has actuated. This can be done by simply Is water temp depressing the reset buttons. -
Page 19: Immersion Thermostat Operation Testing
SERVICE PROCEDURE ACE-V Immersion Thermostat Testing Immersion Thermostat Operation Testing DANGER High voltage exposure. To avoid hazard to Thermostat Specification: life or property use extreme caution when Calibration: 184°F/176°F Max Differential: 6°F making voltage checks . Operating Range 80 to 180°F Providing the water temperature in tank is within the operating range of the thermostat, checking thermostat operation can be as simple as rotating the thermostat dial and listening to the contactor(s) to see if they respond to a call... -
Page 20: Contactor Operation Testing
SERVICE PROCEDURE ACE-VI Contactor Testing DANGER Contactor Operating Coil High voltage exposure. To avoid hazard to Contactor operation is achieved by energizing an operating coil located within the contactor. The contactor life or property, use extreme caution when coil is considered part of the control circuit operating at making voltage checks . -
Page 21: Immersion Thermostat Removal And Replacement
SERVICE PROCEDURE ACE-VII Thermostat Removal and Replacement DANGER Immersion Thermostat Removal High voltage exposure. To avoid hazard to 1. STOP, DANGER! Turn power “OFF” to water heater. Life or property, be sure power is turned OFF to water heater while performing this 2. -
Page 22: High Limit (Eco) Removal And Replacement
SERVICE PROCEDURE ACE-VIII High Limit (ECO) Control Removal and Replacement DANGER High Limit Control (ECO) Removal High voltage exposure. To avoid hazard to 1. STOP, DANGER! Turn power “OFF” to water heater. Life or property, be sure power is turned OFF to water heater while performing this 2. -
Page 23: Heating Element Removal And Replacement
SERVICE PROCEDURE ACE-IX Heating Element Removal and Replacement DANGER High voltage exposure. To avoid hazard to Heating Element Removal Life or property, be sure power is turned OFF 1. STOP, DANGER! Turn power “OFF” to water heater. to water heater while performing this procedure. -
Page 24: Anode Inspection And Replacement
SERVICE PROCEDURE ACE-X Anode Inspection and Replacement Anode Inspection and Replacement DANGER High voltage exposure. To avoid hazard to Life or property, be sure power is turned OFF to water heater while performing this procedure. WARNING Heater components and stored water may be HOT when performing the following steps in this procedure. -
Page 25: Generic Parts List
Generic Parts List Page 25... - Page 26 Generic Parts List Item Description Item Description T&P Relief Valve. Low Water Switch (optional). Nipple Plastisert. Electrical Door Lock (optional). Hot Water Outlet Nipple. Control Box Door. Magnesium Anode. Control Box. Nipple Galvanized. Knockout Plate. Pipe Tee Galvanized. Louver Plate. Combination T&P Gage (optional).
- Page 27 NOTES Page 34...
- Page 28 Email parts@bradfordwhite.com techserv@bradfordwhite.com www.bradfordwhite.com...
Need help?
Do you have a question about the 6A and is the answer not in the manual?
Questions and answers