Raypak 751 manual Electrical Power Connections, Gas Pressure Regulator, Surge Protection

Gas Pressure Regulator

The gas pressure regulator is nominally preset to the outlet values shown in Tables T and U, within +.1 in. WC. If an adjustment is needed, turn the adjustment screw clockwise to increase pressure or counterclock- wise to lower pressure.

Venting of Diaphragm Gas

Components

Boilers have gas train components that have diaphragms in their construction that are supplied with a bleed line connection that must be connected to the outside atmosphere as required by NFGC or (for Canada) the B149 Installation code and applicable provisions of local codes. Under NO circumstances shall bleed lines terminate in the gas utilization equip- ment flue or exhaust system.

ELECTRICAL POWER CONNECTIONS

Installations must follow these codes:

·National Electrical Code and any other national, state, provincial or local codes or regulations having jurisdiction.

·Safety wiring must be N.E.C. Class 1.

·Boiler must be electrically grounded as required by N.E.C. ANSI/NFPA 70-latest edition.

·In Canada, C.S.A. C22. 1 C.E.C. Part 1.

The boiler is wired for 120 VAC. The voltage is indicat- ed on the tie-in leads. Consult the wiring diagram shipped with the boiler in the instruction packet. The “TH” leads are connected to the remote tank control stat, thermostat, or electronic boiler control as applica- ble. 24 Volts are supplied to this connection through the boiler transformer. DO NOT attach line voltage to the “TH” leads. Before starting the boiler check to insure proper voltage to the boiler and pump.

Install a separate disconnect means for each load. Use appropriate-sized wire as defined by NEC, CSA and/or local code. All primary wiring should be 125% of minimum rating.

It is strongly recommended that all individually-pow- ered control modules and the boiler should be supplied from the same power source.

Surge Protection

Microprocessor-based and solid state controls are vul- nerable to damage from voltage and amperage fluctuations in the power supply. All sensitive control components should be protected by a suitable com- mercial-grade surge protection device.

If any of the original wire as supplied with the boiler must be replaced, it must be replaced with 105°C wire or its equivalent.

Check the Power Source

Using a volt-ohm meter (VOM), check the following voltages at the circuit breaker panel prior to connect- ing any equipment: Make sure proper polarity is followed and house ground is proven.

Fig. 17: Check Power Source

AC = 108 Volts AC Minimum, 132 Volts MAX AB = 108 Volts AC Minimum, 132 Volts MAX BC = Must be less than 1.0 Volts AC

Making the Electrical Connections

Refer to Fig. 18 and the wiring diagram.

1.Verify circuit breaker is properly sized by referring to boiler rating plate. A dedicated motor duty circuit breaker should be provided.

2.Turn off all power to the boiler. Verify that power has been turned off by testing with a volt-ohm meter prior to working with any electrical connec- tions or components.

3.Observe proper wire colors while making electrical connections. Many electronic controls are polarity sensitive. Components damaged by improper electrical installation are not covered by warranty.

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