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Hersteller: Bradford-White Corp Dateigröße: 592.1 kb Dateiname: 77fe9708-7f87-4154-8d1f-e2638d0887fd.pdf Unterrichtssprache:

WATER (POTABLE) HEATING AND SPACE HEATING 1. All piping components connected to this unit for space heating applications shall be suitable for use with potable water. 15 2. Toxic chemicals, such as those used for boiler treatment, shall NEVER be introduced into this system. 3. This unit may never be connected to any existing heating system or component(s) previously used with non-potable water heating appliance. 4. When the system requires water for space heating at temperatures higher than required for domestic water purposes, a tempering valve must be installed. Please refer to installation diagrams on pages 23 through 28 in back of manual for suggested piping arrangements. HEATER WIRING IF ANY OF THE ORIGINAL WIRE AS SUPPLIED WITH THE APPLIANCE MUST BE REPLACED, IT MUST BE REPLACED WITH 105°C OR ITS EQUIVALENT, EXCEPT IN THE BURNER HOUSING. IN THIS CASE USE 200°C WIRE. THE COMPUTER CONTROL REQUIRES A SOURCE OF STABLE CLEAN ELECTRICITY FOR PROPER OPERATION. INSTALLING THE HEATER ON A BRANCH CIRCUIT THAT HAS ELECTRONIC NOISE, IS SUBJECT TO FLUCTUATIONS IN VOLTAGE LEVEL OR HAS AN APPLIANCE WHICH GENERATES EMF OF RFI INTERFERENCE CAN CAUSE THE CONTROLLER TO MALFUNCTION. A HIGH QUALITY POWER CONDITIONER MUST BE INSTALLED IF THE ABOVE CONDITIONS EXIST. MALFUNCTIONS CAUSED BY A POOR ELECTRICAL SUPPLY ARE NOT COVERED UNDER YOUR WARRANTY. The controller is wired to the heater as shown in figures 15 & 16. The model and rating plate provides the electrical information needed to size the complete heater branch supply. All electrical work must be installed in accordance with the National Electrical Code, NFPA 70 or the Canadian Electrical Code, CSA C22.1 and local requirements. When installed, the appliance must be electrically grounded in accordance with local codes or, in the absence of local codes, with the National Electrical Code, ANSI/NFPA 70 or the Canadian Electrical Code, CSA C22.1. DO NOT ENERGIZE THE BRANCH CIRCUIT BEFORE THE HEATER TANK IS FILLED WITH WATER. NOTE: This controller is Polarity Sensitive. If the Hot and Neutral Supply Voltage is reversed, the controller will not sense flame. Verify polarity before connecting the unit. WHC1202 INTEGRATED WATER HEATER CONTROL CONNECTION DIAGRAM FIGURE 15. 16 FIGURE 16. OPERATION SEQUENCE OF OPERATION Typical Control/Appliance Operating Sequence 1. When the control is powered, it should first display “0”, then the input line voltage (“120”), the calibration setting (12), then the actual water temperature in the tank. 2. If the control determines that the actual water temperature inside the tank is below the programmed temperature setpoint less the differential, a call for heat is activated. 3. The control then performs selected system diagnostic checks. This includes confirming the proper state of the air switches and ECO limit device. 4. If all checks are successfully passed, the combustion blower is energized for the pre-purge cycle. 5. When the pre-purge cycle is complete, power is applied to the ignitor element for the ignitor warm-up period. 6. At the conclusion of the igniter warm-up period, the gas valve will open, allowing gas to enter the burner chamber. 7. The igniter will remain on for a short predetermined time period, then will be turned off. 8. After an additional 2 seconds, the control will monitor the flame sense probe to confirm a flame is present. If a flame is not verified within this time period, the gas valve will immediately be closed, and the blower will continue to run for approximately 10 seconds. The control will then return to step 2. 9. If a flame is confirmed, the control will enter the heating mode where it will continue heating the tank water until the setpoint temperature plus differential is reached. At this point, the gas valve is closed and the control enters the post-purge cycle. 10. The combustion blower will run for the duration of the post purge cycle to purge the system of all combustion gases. When the post purge cycle is complete, the blower is de-energized and will coast to a stop. 11. The control will now enter the idle state while continuing to monitor the internal tank water temperature and the state of other system devices. If the temperature drops below the setpoint value less differential, the control will automatically return to step 2 and repeat the entire operating cycle. During this idle state, if the control detects an improper operating state for external devices such as the ECO switch, vent switch, pressure switch, etc., the appropriate LED(s) on the Display Board will be illuminated indicating the nature of the fault. SELF DIAGNOSTIC CONTROLLER This controller is designed for ignition lockout after three consecutive failed attempts to light. If lockout occurs, the display lights will match Figure 17. Along with this, a numeric message will appear in the display. The following list of ERROR CODES illustrates possible numeric failures. FIGURE 17. GAS VALVE LED FLASHING This condition results from a failure ...

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