Dexter Laundry T-80 Reversing (On-Premise) - Manual (Page 7)

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5. GAS REQUIREMENTS. The complete gas requirements necessary to operate the dryer
satisfactorily are listed on the serial plate located on the back panel of the dryer.
The inlet gas connection to the unit is 2 inch pipe thread. However, the size of the piping to
supply the dryer should be determined by reference to the National Fuel Gas Code ANSI
Z223.1A-1988 and consultation with the local gas supplier.
A joint compound resistant to the action of liquefied petroleum gases should be employed in
making pipe connections.
A drip tee should be provided in the gas piping entering the unit to catch dirt and other
foreign articles.
All pipe connections should be checked for leakage with soap solution. Never check with an
open flame.
For altitudes above 2,000 feet [610m] it is necessary to derate the BTU input. Contact your
local distributor for instructions.
6. PRESSURE TESTING. The dryer and its individual shutoff valve must be disconnected
from the gas supply piping system during any pressure testing of that system at test pressure in
excess of 2 PSIG [35mbar].
The dryer must be isolated from the gas supply piping system by closing its individual
manual shutoff valve during any pressure testing of the gas supply piping system at test pressures
equal to or less than 2 PSIG [35mbar].
7. EXHAUST INSTALLATION. (Refer to Figure 2 at the end of section 7.) Exhausting of
the dryer(s) should be planned and constructed so that no air restrictions occur. Any restriction
due to pipe size or type of installation can cause slow drying time, excessive heat, and lint in the
room.
From an operational standpoint, incorrect or inadequate exhausting can cause a cycling of the
high limit thermostat, which shuts off the main burners and results in inefficient drying.
Individual exhausting of the dryers is recommended. All heat, moisture, and lint should be
exhausted outside by attaching a pipe of the proper diameter to the dryer adapter collar and
extending it out through an outside wall. This pipe must be very smooth on the inside, as rough
surfaces tend to collect lint, which will eventually clog the duct and prevent the dryer from
exhausting properly. All elbows must be smooth on the inside. All joints must be made so the
exhaust end of one pipe is inside the next one downstream. The addition of an exhaust pipe
tends to reduce the amount of air the blower can exhaust. This does not affect the dryer
operation if held within practical limits. For the most efficient operation, it is recommended that
no more than 20 feet [6m] of straight 8" diameter pipe be used with two right angle elbows.
When more than two elbows are used, two feet of straight pipe should be removed for each
additional elbow. No more than four right angle elbows should be used to exhaust a dryer.