Adjustment, if required, is performed as follows:
1.Set primary system temperature control dial (thermostat) at lowest setting so that boiler will not call for heat.
2.Attach a pressure gauge to the tapping in the control string elbow.
3.Reset primary system temperature control dial (thermostat) to highest setting. Main burner will now ignite.
4.With main burner firing, adjust pressure, if necessary, by turning pressure regulator adjusting screw with a screwdriver.
•Clockwise to increase pressure.
•Counterclockwise to decrease pressure.
5.Set primary system temperature control dial (thermostat) to lowest setting.
6.Remove pressure gauge and replace sealing plug.
7.Set primary system temperature control dial (thermostat) to desired setting.
WARNING
DO NOT INCREASE GAS PRESSURE ABOVE THAT SPECIFIED ON THE RATING PLATE, AS OVERFIRING WILL RESULT IN DAMAGE TO THE BOILER, AS WELL AS INCREASED RISK OF FIRE, SOOTING AND ASPHYXIATION.
If gas pressure regulator cannot be adjusted to correct pressure with sufficient gas pressure at the valve, replace with new gas valve.
WIRING
WIRING CONNECTIONS
CAUTION
LABEL ALL WIRES PRIOR TO DISCONNECTION WHEN SERVICING CONTROLS. WIRING ERRORS CAN CAUSE IMPROPER AND DANGEROUS OPERATION. VERIFY PROPER OPERATION AFTER SERVICING.
1.CONVENTIONAL INSTALLATIONS
ALL ELECTRICAL WORK MUST BE INSTALLED IN ACCORDANCE WITH NATIONAL ELECTRICAL CODE, ANSI/NFPA 70 AND/ OR THE CANADIAN ELECTRICAL CODE, PART 1, CSA C22.1, ELECTRICAL CODE AND MUST CONFORM TO LOCAL REGULATIONS.
The boiler, when installed, must be electrically bonded to ground in accordance with the requirements of the authority having jurisdiction or, in the absence of such requirements, with the National Electrical Code, ANSI/NFPA 70 and/or the Canadian Electrical Code Part 1, CSA C22.1, Electrical Code.
STRICT ADHERENCE TO PIPING AND WIRING DIAGRAMS IS REQUIRED TO PREVENT CONSTANT PUMP OPERATION WHEN SYSTEM TEMPERATURE CONTROL IS SATISFIED. OTHERWISE THE WARRANTY IS VOID AS STIPULATED IN THE LIMITED WARRANTY ON THE INSTRUCTIONS MANUAL.
The electrical connections must be made so that the circulator will operate before the gas valve opens. At no time may the controlling system allow the burner to fire when there is no water flow through the boilers.
Refer to the diagrams in Figures 16 and 17 on pages 24 and 25 for proper wiring sequence with conventional single boiler installations.
The THERMAL BALANCER shown is factory included by A. O. Smith. This device serves as a pump shutdown delay switch to balance the rising boiler water temperature to system temperature before the pump stops. Overshooting of boiler temperature is prevented and stack loss after shutdown is negligible.
WARNING
AN ELECTRICAL GROUND IS REQUIRED TO REDUCE RISK OF ELECTRIC SHOCK OR POSSIBLE ELECTROCUTION. Make the ground connection to the screw provided in the electrical supply junction box on the boiler.
IF ANY OF THE ORIGINAL WIRE, AS SUPPLIED WITH THE APPLIANCE, MUST BE REPLACED, IT MUST BE REPLACED WITH TYPE 1050C WIRE OR ITS EQUIVALENT, EXCEPT FOR THE FLAME SENSOR AND IGNITION CABLE WHICH ARE 2500C AND WIRES CONNECTED TO THE COIL PROTECTOR WHICH ARE 2000C.
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