Burnham MST288, MST396, MST629, MST513 manual Section Vi Electrical, Danger, A. General

SECTION VI: ELECTRICAL

DANGER

Positively assure all electrical connections are unpowered before attempting installation or service of electrical components or connections of the boiler or building. Lock out all electrical boxes with padlock once power is turned off.

WARNING

Failure to properly wire electrical connections to the boiler may result in serious physical harm.

Electrical power may be from more than one source. Make sure all power is off before attempting any electrical work.

Each boiler must be protected with a properly sized fused disconnect.

Never jump out or make inoperative any safety or operating controls.

A.General

1.Install wiring and electrically ground boiler in accordance with requirements of the authority having jurisdiction, or in absence of such requirements the National Electrical Code, ANSI/ NFPA 70.

2.Refer to National Electric Code or Local Electric

Codes for proper size and type of wire required.

Follow Code.

3.A separate electrical circuit must be run from the main electrical service with an over-current device/disconnect in the circuit. A service switch is recommended and may be required by some local jurisdictions.

4.Use anti-short bushings on all wiring passing through boiler jacket, junction boxes and/or control boxes.

5.Use armored cable (BX) over all exposed line voltage wiring.

6.If an Alliance™ indirect water heater is used, use priority zoning. Do not use priority zoning for

Hydro-Air Systems.

7.Wiring should conform to Figure 18.

B.Install A room thermostat on an inside wall about four feet above floor. Never install thermostat on an outside wall or where it will be influenced by drafts, hot or cold water pipes, lighting fixtures, television, rays of the sun or near a fireplace.

Keep large furniture away from thermostat so there will be free movement of room air around this control.

Heat Anticipator in Thermostat should be set to match the requirements of the control to which it is connected. See Figure 20 for desired system and heat anticipator setting. If system tends to overheat above the thermostat's temperature setting, reduce heat anticipator setting by .1 or .2 amps. If system tends to short cycle without reaching desired room temperature, increase heat anticipator setting by .1 or .2 amps.

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