Technical gas data, Natural gas, Liquid propane (l.p.) gas – Maytag MDG120 User Manual

Page 15: Piping/connections

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NOTE: Undersized gas piping will result in
ignition problems, slow drying, increased use of

energy, and can create a safety hazard.

The dryer must be connected to the type of
heat/gas indicated on the dryer data label
affixed to the back of the dryer at the upper
right hand corner. If this Information does not
agree with the type of gas available, do not

operate the dryer. Contact the distributor who
sold the dryer.

IMPORTANT: Any burner changes or conver­

sions must be made by a qualified profes­

The input ratings shown on the dryer data label
are for elevations of up to 2,000 feet, unless

elevation requirements of over 2,000 feet were
specified at the time the dryer order was placed
with the factory. The adjustment or conversion
of dryers in the field for elevations over 2,000

feet are made by changing each burner orifice.

If this conversion is necessary, contact the

distributor who sold the dryer.


Gas Specifications

Type of Gas


Liquid Propane

Manifold Pressure*

3.5-4.0 Inches W.C.

10.5-11.0 inches W.C.

Inline Pressure

6.0 to 12.0 inches W.C.

11.0 Inches W.C.

* Measured at gas valve pressure tap when the gas valve Is on

GAS Connections:

Inlet connection


Inlet supply size

1-inch N.P.T.



Btu/hr input (per dryer) 375,000

Natural Gas

Regulation is controlled by the dryer’s gas

valve’s Internal regulator. Incoming supply

pressure must be consistent between a mini­
mum of 6.0 inches and a maximum of 12.0

inches water column pressure.

Liquid Propane (L.P.) Gas

Dryers made for use with L.P. gas have the gas

valve’s internal pressure regulator blocked
open so that the gas pressure must be regu­

lated upstream of the dryer. The pressure

measured at each gas valve pressure tap must
be a consistent 11.0 inches water column.

There is no regulator or regulation provided in
an L.P. dryer. The water column pressure must

be regulated at the source (L.P. tank) or an

external regulator must be added to each

Type of Gas



Kit Part





Per Hour



Liquid Propane

Qty. QM.S*



Qty. □iM.a* Part


MDG120 375,000



140832 3

#30 I4081S 880886

*D.M.S. (Drill Material Size) equivalents are as follows:

Natural Gas............................. #4 = .2090”

Liquid Propane Gas................#30 = .1285”


ALL components/materials must conform to

National Fuel Gas Code Specifications, or in

CANADA, the Canadian Installation Codes (for
General Installation and Gas Plumbing). It Is
important that gas pressure regulators meet
applicable pressure requirements and that gas
meters be rated for the total amount of all the
appliance Btu’s being supplied.

The dryer is provided with a 1-inch N.P.T. inlet
pipe connection extending out the back area of
the burner box. The minimum pipe size connec­
tion (supply line) to the dryer is 1-inch N.P.T.

For ease of servicing, the gas supply line of

each dryer must have its own shut-off valve.

The size of the main gas supply line (header)
will vary depending on the distance this line
travels from the gas meter or, in the case of L.P.

gas, the supply tank, other gas-operated appli­
ances on the same supply line, etc. Specific

information regarding supply line size should
be determined by the gas supplier.

NOTE: Undersized gas supply piping can

create a low or inconsistent pressure which will

result in erratic operation of the burner ignition


Consistent gas pressure is essential at ALL
gas connections. It is recommended that a 1 -
inch pipe gas loop be installed in the supply line
serving a bank of dryers. An in-line pressure

regulator must be installed in the gas supply
line (header) if the (natural) gas pressure