Image DE 30 Instruction Manual page 31

INSTALLATION PROCEDURES
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 dryer.
Machine Model
Dryer DE30 lb.
Dryer DE50 lb.
Dryer DE75 lb.
3. Piping / Connections
All components / materials must conform to the National Fuel Gas Code ANSI Z223.1 –
LATEST EDITION, or in Canada, the Canadian Installation Codes CAN/CGA – B149.1 – M91
(Natural Gas) or CAN/CGA – B149.2 – M91 (L.P. Gas) or LATEST EDITION.
It is important that gas pressure regulators meet applicable pressure requirements and that
gas meters be rated for the total amount of the entire 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. DE-35 1/2 inch, DE-50 1/2 inch, DE-75 3/4 inch, The minimum pipe size
connection (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
appliances 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 system.
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 exceeds 12.0 inches of
water column pressure.
IMPORTANT: A water column pressure of 3.5 to 4.0 inches for natural gas and 11.0 inches for
L.P. dryers is required at the gas valve pressure tap of each dryer for proper and
safe operation.
A 1/8 – inch N.P.T. plugged tap, accessible for a test gauge connection, must be installed in
the main gas supply line immediately upstream of each dryer.
IMPORTANT: Pipe joint compounds that resist the action of natural and L.P gases must be used.
IMPORTANT: Test all connections for leaks by brushing on a soapy water solution (liquid
detergent works well).
WARNING: NEVER test for leaks with a flame.
IMPORTANT: The dryer and its individual shut – off valve must be disconnected from the gas
supply piping system during any pressure testing of that system at test pressures in
excess of 1/2 psig (3.5 kPa).
NOTE: The dryer must be isolated from the gas supply piping system by closing its individual
manual shut off valve during any pressure testing of the gas supply piping system at test
pressures equal to or less than 1/2 psig (3.5 kPa).
Table 3-3 Gas Data
Consumption (Btu/hr)
3-18
90000
130000
200000