Maytag Commercial MLG45 Installation Manual page 11

The input ratings shown on the data label are for elevations up
to 2000' (610 m), unless elevation requirements of over
2000' (610 m) 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 2000' (610 m) is made by
changing each burner orifice. If this conversion is necessary,
contact the distributor who sold the dryer or contact the
manufacturer.
IMPORTANT: If connection to this dryer is made with a
flexible hose, it must be suitable for the appliance category in
accordance with national installation regulations of the country
of destination, and if in doubt the installer must contact the
supplier. The manufacturer of this dryer does not recommend
the use of flexible gas supply line/hose.
Pipe joint compounds that resist the action of natural, propane,
and butane gases must be used.
In the U.S.A: An individual manual shutoff valve must be
installed within 6' (1.8 m) of the dryer in accordance with the
National Fuel Gas Code, ANSI Z223.1.
In Canada: An individual manual shutoff valve must be
installed in accordance with the B149.1, Natural Gas and
Propane Installation Code. It is recommended that an individual
manual shutoff valve be installed within 6' (1.8 m) of the dryer.
Natural Gas Specifications**
Nominal
Supply Gross Heat
Heating
Pressure Input
Value
Btu
Btu/ft in WC
3
/hr
1000 6.0-12.0 224000 65.64
*Consult factory for elevations over 2000' (609.6 m) for correct
burner orifice size(s).
** Btu rating for both tumblers.
Gas Connections
Inlet connection .....3/4" M.N.P.T.
Inlet supply size ....3/4" Pipe (minimum)
Piping / Connections
The dryer is provided with a 3/4" N.P.T. inlet pipe connection
on top of the dryer. It is recommended that a gas shutoff valve
be provided to the gas supply line of each dryer for ease in
servicing.
The size of the main gas supply line (header) will vary
depending on the distance this line travels from the gas meter.
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 system.
TYPICAL NATURAL GAS INSTALLATION
GAS LOOP
GAS SHUTOFF
VALVE
DRYERS
Orifice
Orifice
Size* Pressure
(Injector)
Quantity
kW DMS mm
5 5.2197 2
GAS SERVICE LINE TAP
GAS WATER HEATERS
IN-LINE PRESSURE REGULATOR
(ONLY WHEN LINE PRESSURE)
EXCEEDS 13" (32.34 MB)
WATER COLUMN
Consistent gas pressure is essential at all gas
connections. It is recommended that a 3/4" (19.05 mm)
pipe gas loop be installed in the supply line servicing
a bank of dryers. An in-line pressure regulator must be
installed in the gas supply line (header) if the (natural) gas
pressure exceeds 13.0 in WC (3.23 kPa) pressure.
A minimum 1/8" N.P.T. plugged tap, accessible for a
pressure gauge connection, must be installed in the main
gas supply line immediately upstream of the dryers.
Test all connections for leaks by brushing on a soapy
water solution (liquid detergent works well).
Gas Pressure Test Procedure
Burner
1. Disconnect power to the dryer.
in WC
2. Turn off gas supply using the shutoff valve that supplies the
3.5
dryer.
3. Remove the back panel from the dryer.
4. Locate the output pressure tap screw on the gas valve and
unscrew 4 to 5 full turns.
5. Connect the airtight hose to pressure tap post. (Airtight
hose will attach between pressure tap post and
manometer).
6. Feed hose through an opening in the back panel while
reattaching the back panel to the dryer.
7. Connect opposite end of hose to manometer.
8. Turn on gas supply using the shutoff valve that supplies the
dryer and reconnect the power.
9. Start the dryer in Heat Mode and wait for ignition.
10. Record the manometer reading. Check the reading
against the Burner Pressure column in the "Natural Gas
Specification" chart on page (12). Measured value should
be within .30" W.C. of that value. If not, see the next section
on Gas Pressure Adjustment.
11. Once test is complete, disconnect power to the dryer.
12. Turn off gas supply using the shutoff valve that supplies the
dryer.
13. Remove the back panel from the dryer.
14. Disconnect manometer.
15. Remove hose from pressure tap post. Tighten screw inside
the pressure tap or install plug.
GAS METER
11