Hayward H-Series Millivolt Na Mv Pool Heater All models English - Page 17

SECTION 3. INSTALLATION WIRING DIAGRAM - MILLIVOLT - SINGLE THERMOSTAT TEMPERATURE LIMIT SWITCH LIMIT SWITCH PRESSURE SWITCH LIMITER SWITCH GAS VALVE ROBERTSHAW V BL R BK TH TP TH R TERMINAL BLOCK REMOTE CONTROL BK TEMPERATURE LIMITER (MANUAL) SWITCH TP GAS VALVE HONEYWELL ON OFF JUMPER SYSTEM SWITCH ON SPA/POOL T'STAT Y GY OFF IF ANY OF THE ORIGINAL WIRE AS SUPPLIED WITH THE HEATER MUST BE REPLACED, IT MUST BE REPLACES WITH APPLIANCE WIRING MATERIAL SUITABLE FOR 105ºC (STYLE 1015 OR 1230) OR ITS EQUIVALENT. P BK GENERATOR PILOT THPP TH PP W R Figure 30: Wiring Diagram - Millivolt Millivolt System: The millivolt operated heater is equipped with a standing pilot and a thermopile (pilot generator). All of the electric current required to operate the controls within the heater is provided by the pilot generator. No external wiring or electrical connections are required. The system consists of seven separate controls wired in series with the gas valve. All switches in these controls must be "closed" for the main gas valve to open and allow the heater to operate. The individual controls are described in the Maintenance/Servicing section of this manual. Figure 30 shows the heater wiring for millivolt operated systems. Electronic Ignition System: The electronic ignition system is equipped with the same basic controls as the millivolt operated heater but a direct spark ignition device (DS) is used to automatically light the main burners on each call for heat. With the DS module these controls operate on 24 volts so an external power source is required. All wiring connections to the heater must be made in accordance with the latest edition of the National Electrical Code ANSI/NFPA 70, unless local code requirements specify otherwise. In Canada, follow CSA C22.1 - CANADIAN ELECTRICAL CODE, Part 1. Since an external electrical source is utilized, the heater, when installed, must be electrically grounded and bonded in ac- cordance with local codes, or in the absence of local codes, with the National Electrical Code, ANSI/NFPA 70. The H-Series heater can be installed with the electrical connections, service entry/remote control, located on either the left or right side of the heater. Punch out the knockout slug adjacent to the controls compartment on either or both sides as necessary. The heater is supplied with a dual voltage transformer for either 120 volt or 240 volt power supply. If the heater is to be wired in series with the pump, the electrical circuit draws only 0.3 amps. Use a 15 amp circuit breaker if heater is wired to a separate circuit. Field wiring connections are to be made inside the junction box located behind the control access door. For a heater powered by a 120V source, refer to the wiring diagram and connect the power supply to the black (common) lead and the white (120V) lead. See Figure 31. For a pool heater powered by a 240V source, refer to the wiring diagram and connect the power supply to the black (common) lead and the orange (240V) lead. See Figure 32. A ground lead is provided inside the junction box for connection of green insulated ground wire. Replace junction box cover and close access panel upon completion of field wiring. Figure 33 shows the heater wiring for electronic ignition systems. 15