Midco Economite RE4400DS - Manual (Page 5)

conduit will provide sufficient grounding. However, a ground lug is located in control box 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 L1, neutral L2—and that the
neutral line is not subject to induced low voltage (check L2 to earth ground) from other
equipment, as that can cause the Electronic Control to malfunction.
? Each installation must include suitable limit control(s). Existing oil burner combination
operating and limit controls are normally NOT SUITABLE for gas burner use.
? Connect motors used on forced air furnace fans or boiler pumps to a combination limit
control and switch.
? Set the thermostat heat anticipator for the total current draw handled by the thermostat.
The current draw of the ECONOMITE 24V operating circuit is 0.9 amps.
CAUTION: Label all wires prior to disconnection when servicing controls.
Wiring errors can cause improper and dangerous operation. Verify proper operation
after servicing.
____________________________
CAUTION: The available gas pressure should be within the limits shown in
Table 1 - SPECIFICATIONS section. Excessive pressure may damage electric valves,
regulators and manual valves. If the supply pressure exceeds the 14.0"W.C. maximum,
a suitable high pressure regulator must be installed between the Main Manual Shut-
Off Valve and burner combination valve as shown in Figure 6.
? 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 6.
? Use pipe joint compound approved for use with Liquid Petroleum Gases.
? Piping must also comply with your local codes.
? To obtain the maximum firing rate of the burner, the gas supply piping must be sized to
provide a minimum pressure of 7.0"W.C. (Natural) and 5.0”W.C. (Propane) to the inlet of the
combination redundant valve when the burner and all other gas utilization equipment are on.
The main regulator, if equipped, should be mounted upright and in a horizontal run of pipe.
CAUTION: Because it is difficult to accurately control pressure during supply
pipe leak testing, it is recommended that all low pressure (14.0"W.C. max.)
components be disconnected during testing. Exposing low pressure regulators and
valves, including manual valves, to pressures over 1/2 PSIG (14.0"W.C.) will cause
damage and void all warranties.
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 limitation, be sure to carry out
the general arrangement shown in Figure 6. Install the combination valve in any position
except up-side down.
5
Part 1
Installation Continued
Part 1 Installation
Figure 5: Wiring Diagram
VI Piping
V Electrical
Continued