Advertisement
Quick Links
Atmospheric Gas Water Heaters
Robertshaw and Honeywell Gas Control
(GX155S6BN Model Shown)
Manual 238-46647-00B
For Models Using White Rodgers,
SERVICE
MANUAL
Troubleshooting Guide
and Instructions for Service
(To be performed ONLY by
qualified service providers)
Models Covered
by This Manual:
GX225S*BN
GX155S*BN
25X78B*N
55X80B*N
M1XR65T*(BN,CX,SX)
MI75S*(BN,CX,SX)
M2XR75S*(BN,CX,SX)
MI100T*(BN,CX,SX)
65T65*(BN,CX,SX)
75T80*(BN,CX,SX)
C(S,D)W275T*(BN,CX,SX)
(*) Denotes Warranty Years
Save this manual for future reference
Advertisement
Related Manuals for Bradford White GX225S BN Series
Summary of Contents for Bradford White GX225S BN Series
- Page 1 Atmospheric Gas Water Heaters For Models Using White Rodgers, Robertshaw and Honeywell Gas Control SERVICE MANUAL Troubleshooting Guide and Instructions for Service (To be performed ONLY by qualified service providers) Models Covered by This Manual: GX225S*BN GX155S*BN 25X78B*N 55X80B*N M1XR65T*(BN,CX,SX) MI75S*(BN,CX,SX) M2XR75S*(BN,CX,SX) MI100T*(BN,CX,SX)
- Page 2 Table of Contents Service Page Procedure Troubleshooting Chart White Rodgers and Robertshaw Gas Control - - - Troubleshooting Chart Honeywell Gas Control - - - Thermocouple Testing and Replacement White Rodgers and Robertshaw Gas Control AG-I Thermopile Testing and Replacement Honeywell Gas Control AG-I Pilot Assembly Inspection Cleaning and Replacement White Rodgers and Robertshaw Gas Control...
-
Page 3: Troubleshooting Chart
Troubleshooting Chart For Models Using White Rodgers or Robertshaw Thermostat Service Symptom Probable Cause Corrective Action Procedure 1. No incoming gas or too low gas 1. Turn on gas supply and/or check line pressure. pressure. 1. See Service Procedure 2. Gas control knob set to wrong position. 2. - Page 4 Troubleshooting Chart For Models Using Honeywell Gas Control LED Indicator Observe LED indicator on gas control. Error flash codes are displayed with a three second pause before repeating. Check and repair the system as noted in the troubleshooting table below: Service LED Status Control Status...
- Page 5 Troubleshooting Chart (cont.) For Models Using Honeywell Gas Control Service LED Status Control Status Probable Cause Procedure 1. Damage to thermowell Five flashes and a three See Service Procedure wires. Thermowell fault second pause. 2. Thermowell sensor resistance AG-III, Page 16 out of range.
- Page 6 SERVICE PROCEDURE AG-I Thermocouple Testing and Replacement For Models Using White Rodgers or Robertshaw Gas Control OPEN CIRCUIT THERMOCOUPLE TESTING Step 1. Disconnect thermocouple from gas control. Step 2. Using a multimeter capable of measuring millivolts, connect one alligator clip to the end ball or contact portion of the thermocouple, and the other alligator clip to copper portion of the thermocouple.
- Page 7 SERVICE PROCEDURE AG-I Thermocouple Testing and Replacement For Models Using Honeywell Gas Control OPEN CIRCUIT THERMOPILE TESTING Step 1. Disconnect red and white thermopile wires from the wire harness leading to the gas control. Step 2. Using a multimeter capable of reading millivolts, check across thermopile leads. Step 3.
- Page 8 SERVICE PROCEDURE AG-I Thermopile Testing and Replacement For Models Using Honeywell Gas Control THERMOPILE REPLACEMENT Step 1. Turn off the gas supply to the water heater by rotating the gas control knob to the “OFF” position (see Figure 7). Step 2. Remove outer jacket door. Step 3.
- Page 9 SERVICE PROCEDURE AG-II Pilot Assembly Inspection, Cleaning and Replacement For Models Using White Rodgers or Robertshaw Gas Control For White Rodgers gas control, depress knob PILOT ASSEMBLY INSPECTION, slightly and rotate CLEANING AND REPLACEMENT clockwise to the “OFF” position. Figure 8 Step 1.
- Page 10 SERVICE PROCEDURE AG-II Pilot Assembly Inspection, Cleaning and Replacement For Models Using Honeywell Gas Control PILOT ASSEMBLY INSPECTION, CLEANING AND REPLACEMENT Step 1. Turn off the gas supply to the water Primary Air Heater. Rotate gas control knob to the Opening “OFF”...
- Page 11 SERVICE PROCEDURE AG-II Pilot Assembly Inspection, Cleaning and Replacement For Models Using Honeywell Gas Control IGNITER/ELECTRODE TESTING AND REPLACEMENT With the pilot not in operation (no pilot flame) the igniter and electrode circuit function can be observed by opening the combustion chamber door and viewing whether there is a sparking action. Step 1.
- Page 12 SERVICE PROCEDURE AG-III Gas Control Testing and Replacement For Models using White Rodgers or Robertshaw Gas Control Gas Control Testing and Replacement The gas control is a non repairable device. If trouble shooting has determined a problem with the gas control, it must be replaced.
- Page 13 SERVICE PROCEDURE AG-III Gas Control Testing and Replacement For Models using White Rodgers or Robertshaw Gas Control THERMOCOUPLE TESTING See SERVICE PROCEDURE AG-II MAGNET ASSEMBLY TESTING (White Rodgers Control) Step 1. Following the lighting instruction label on the heater, proceed to light the pilot and allow to operate for three minutes.
- Page 14 SERVICE PROCEDURE AG-III Gas Control Testing and Replacement For Models using White Rodgers or Robertshaw Gas Control ECO (Energy Cut Off) TESTING Step 1. Disconnect thermocouple from gas control. Step 2. Using a multimeter capable of measuring Ohms (or continuity), attach one lead (alligator clip) to the pilot tube.
- Page 15 SERVICE PROCEDURE AG-III Gas Control Testing and Replacement For Models using White Rodgers or Robertshaw Gas Control Step 7. Removal of gas control. a) Disconnect main burner feedline, pilot tube and thermocouple from gas control & remove burner from combustion chamber. NOTE: Feed line nut for natural gas control uses right hand threads, LP control uses left hand thread.
- Page 16 SERVICE PROCEDURE AG-III Honeywell Thermowell Testing and Replacemet HONEYWELL THERMOWELL TESTING Step 1. If gas control has gone into lockout due to excessive tank temperature (four flashes and a three second pause) reset the gas control to the “OFF” position. Then follow the instructions located on the lighting instruction label or the lighting instructions located in the installation and operation manual.
- Page 17 SERVICE PROCEDURE AG-III Honeywell Thermowell Testing and Replacement DETERMINE WATER HEATER TANK TEMPERATURE WARNING NOTE: Stored water may be HOT when It is important to understand once the resistance for the thermowell is determined, water flow performing the following steps in this through the water heater should not occur.
- Page 18 Step 3. Disconnect wire harnesses and burner assembly from the gas control. Step 4. Using the gas control service tool (part number 239-45991-00) available from your Bradford White parts supplier, insert tool into the back of the gas control (see Figure 32 & 33).
- Page 19 SERVICE PROCEDURE AG-III Honeywell Gas Control and Thermowell Replacement HONEYWELL GAS CONTROL ASSEMBLY TO THERMALWELL Step 1. Install threaded end of thermowell into water heater. When tight, be sure thermowell flange is positioned so that thermowell relief opening is in the 6 o’clock position for proper control alignment (see Figure 35).
- Page 20 SERVICE PROCEDURE AG-IV Burner Operation Inspection, Adjustment Cleaning and Replacement MAIN BURNER: Inspection, Adjustment, Cleaning and Replacement At periodic intervals (not more then 6 months) a visual inspection should be made of the main burner for proper operation and to insure no debris accumulating. Main burner should light smoothly from pilot and burn with a blue flame with a minimum of yellow tips.
- Page 21 SERVICE PROCEDURE AG-IV Burner Operation Inspection, Adjustment Cleaning and Replacement MAIN BURNER: Inspection, Adjustment, Cleaning and Replacement (cont.) Step 3. Fully inspect combustion chamber for debris or carbon build up. Step 4. Be certain that thermocouple or thermopile, and pilot tube are routed correctly through the relief opening in the combustion chamber.
- Page 22 SERVICE PROCEDURE AG-IV Burner Operation Inspection, Adjustment Cleaning and Replacement BURNER CLEANING (Cont.) Step 5. Steel Burner: Disconnect (unscrew) burner from main burner orifice. Cast Iron Burner: Disconnect (unscrew) main burner feedline from burner. Figure 44 Step 6. Remove main burner orifice from feedline. Inspect and clean if necessary.
- Page 23 SERVICE PROCEDURE AG-V Diptube and Anode Inspection and Replacement DIPTUBE INSPECTION AND REPLACEMENT WARNING Water heater components and stored water may be HOT when performing the following steps in this procedure. Take necessary precaution to prevent personal injury. Step 1. Turn the gas control knob to the “OFF”...
- Page 24 SERVICE PROCEDURE AG-V Diptube and Anode Inspection and Replacement ANODE INSPECTION AND REPLACEMENT WARNING Water heater components and stored water may be HOT when performing the following steps in this procedure. Take necessary precaution to prevent personal injury. Step 1. Turn gas control knob to “OFF”...