Midco DS45B - Manual (Page 5)

Part 1
Installation
Continued
The frame of the burner should be well grounded. Normally the piping and/or electric
conduit will provide sufficient grounding. However, 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 earth ground) from other
equipment, as that can cause the electronic flame safeguard 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.
Set the thermostat heat anticipator for the total current draw handled by the thermostat.
The current draw of the Economite 24V operating circuit is 0.7 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: Do not add any power consuming devices in the low voltage cir-
cuit as it could overload the transformer. Do no use the Motor Relay to operate any
external devices as the extra load could damage the relay contacts.
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.
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CAUTION: The available gas
pressure should be within the limits
shown in SPECIFICATIONS section.
Excessive pressure will damage
Combination Valve and Regulator. If
the supply pressure exceeds the
14.0" W.C. maximum, a suitable
intermediate main regulator 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 comply with local codes.
To obtain the maximum firing rate of
400 MBH, the NATURAL gas supply
piping must be sized to provide a mini-
mum of 5.0" W.C. pressure (11.0" W.C.
PROPANE) to the inlet of the combina-
tion valve when the burner and all
other gas utilization equipment are on.
CAUTION: Because it is
difficult to accurately control
pressure during supply pipe leak test, it is recommended that the Combination Valve
be disconnected. Exposing the Combination Valve to a pressure 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 jacketed 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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5
Part 1 Installation
VI Piping
V Electrical
Continued
Pipe
Size
3/4
1
1 1/4
1 1/2
400
400 250
250
400
400 200
200
350
400
400
250
300
400
Type of
Gas
Propane
Natural
Propane
Natural
Propane
Natural
Capacity - MBH
Length of Pipe
Capacities shown are for a total pressure drop of
0.3” W.C. For 0.5” W.C. pressure drop, multiply
capacity shown by 1.3. For higher permissible
pressure drops, consult your fuel supplier.
15 30 45 90
Table 2: Supply Pipe Capacities in MBH
Figure 5: Piping Connections