Midco Economite E20B - V ELECTRICAL; VI PIPING

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MODEL E20B ECONOMITE

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CONNECTION DIAGRAM

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SCHEMATIC

LEGEND

CAUTION: Do not add any power consuming devices in the low voltage circuit as overloading of the transformer

can result. Do not use Motor Relay to operate any external devices as overloading of motor relay contacts can result.

NOTE: If any of the original wiring as supplied with the conversion burner must be replaced, it must be replaced with type TFF wire or

its equivalent.

Capacities shown are for a total pressure drop of 0.3"

W.C. For a higher permissible pressure drops, consult

your fuel supplier. Source, Gas Engineering Handbook -

1974

TABLE 2 Supply Pipe Capacities in MBH

145

190

225

100

125

150

225

TYPE

OF GAS

NATURAL

PROPANE

NATURAL

PROPANE

NATURAL

PROPANE

NATURAL

PIPE

SIZE

1/2

3/4

11/4

APPROX. CAPACITY - MBH

LENGTH OF PIPE

130

200

225

100

130

205

225

105

165

195

-4-

FIGURE 5. Wiring Diagram

V ELECTRICAL

Installation wiring and grounding of the burner must

conform to local codes or, in their absence in the United

States to National Electric Code, ANSI/NFPA No. 70

latest edition; in Canada, to Canadian Electrical Code

Part 1, CSA Standard C22.1.

■ Use 14 gage copper wire, for line voltage wiring. Be

sure to hook up to a permanently live circuit. Provide a

fused on-off disconnect switch carrying a minimum 3

amp fuse.

■ The frame of the burner should be well grounded. A

terminal is provided on the terminal strip for positive

grounding where insulated pipe couplings are used or

where any doubt exists regarding grounding sufficiency.

■ Confirm that the polarity is correct -- hot wire to strip

terminal 1, neutral 2 and that the neutral line is not subject

to induced low voltage (check 2 to ground) from other

equipment .

■ Each installation must include suitable limit controls.

Existing oil burner combination limit and operating controls

containing cad cells.are NOT SUITABLE for gas burner

use.

■ Set the thermostat heat anticipator for total current draw

handled by the thermostat. The current draw of the

Economite 24V operating circuit is 0.3 amp on E20B

(NATURAL) and 0.7 amp on E20BP (PROPANE). Setting

may have to be increased on steam or gravity systems.

CAUTION: Label all wires prior to disconnection

when servicing controls. Wiring errors can cause

improper and dangerous operation. Verify proper

operation after servicing.

VI PIPING

CAUTION: The available gas pressure should be

within the limits shown in SPECIFICATIONS section.

If the supply pressure exceeds the 14.0" W.C.

maximum, a suitable intermediate main regulator rated

for main and pilot loads must be installed ahead of the

main manual shut-off valve shown in Figure 5.

■ The burner gas supply piping should branch off from the

main line as close to the gas meter as possible. Do not

connect to the bottom of a horizontal section. Use new

black pipe and malleable fittings free of cutting and

threading burrs or defects.

■ Provide a sediment trap, union and 1/8" pressure tap in

piping close to burner as shown in Figure 5.

■ Use pipe joint compound resistant to Liquid Petroleum

Gases.

■ Piping must also comply with local codes.

■ To obtain the maximum firing rate of 225 MBH, the

NATURAL and PROPANE gas supply piping must be sized

to provide a minimum of 5.0" W.C. pressure to the inlet of the

combination valve when the burner and all other gas

appliances are on.

CAUTION: Because it is difficult to accurately con-

trol pressure during supply pipe leak test, it is recom-

mend that the Combination Valve be disconnected. Ex-

posing the Combination Valve to pressures over 1/2

PSIG will damage the valve and void its warranty.

DANGER: Explosion hazard. Do not use oxygen for

pressure testing. An explosion could occur during initial

start-up.

■ If the burner piping must be rearranged because of space

limitations, be sure to carry out the general arrangement

shown in Figure 5. Install the combination valve in any

position except up-side down.

■ When the burner is installed in the vestibule of equipment,

it is recommended that the combination valve be left

adjacent to the Burner within the vestibule and the Main

Manual Shut-Off Valve be installed outside.

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Midco Economite E20B - V ELECTRICAL; VI PIPING

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