C E N T R I F U G A L H E A T E R - C S A
Chief Industries, Inc. 800-359-7600 INSTALLATION - 416274
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Natural Gas
The natural gas service should be able to provide a minimum of 5 psig (34kPa) when the heater is
operating. Check with your gas supplier to verify that the supply pressure has the pressure potential to
deliver natural gas for the length of the service line.
A line strainer must be located at the heater (order part #714709).
The natural gas service should be regulated. Contact your gas supplier. A regulator can be obtained
from Caldwell (order part #753905).
Fuel Line Installation
The suggested tubing size to be used from the supply to the heater is 5/8" (1.59cm) O.D. type K
copper tubing or 1/2" (1.27cm) black schedule 80 steel pipe. If copper tubing is used, make a loop in
the tubing within 3’ (0.9m) of the heater to absorb shock. If 1/2" (1.27cm) steel pipe is used, run the
plumbing to within about 3’ (0.9m) of the heater, and use three feet of 3/8" (.95cm) minimum I.D. high
pressure flexible hose, (CGA approved for propane). Be careful not to turn or twist the heater
plumbing parts because the proper operation of these can be affected or leaks in joints can be
developed. Verify all foreign material is out of the gas line before connecting the line to the heater.
If your natural gas supply pressure is not adequate to maintain 10 psig (69kPa) at the heater, use a one
inch or larger service line and verify that 5 psig (34kPa) natural gas pressure is available when the heater
is operating. Install a line strainer between the natural gas heater and the service line.
Check all connections for leaks with a soap test. Open the supply valve at the source and use a liquid
detergent and brush all fittings and joints. If bubbles are generated at the fitting, gas is escaping from
the joint. With the installation of the service line, inspect all parts that are added, and the heater
plumbing parts affected by the installation. Tighten the components that are not sealing and replace if
cracked or defective.
Note: Do not use galvanized pipe fittings
.
High Limit Installation
The High Limit control is connected by conduit to the control enclosure of the heater. The High Limit
will need to be installed into the bin plenum as shown in the following illustration. Install the high limit
on the right hand side of the transition, 2’ - 3’ (.60m - .91m) from the transition, approximately midway
up in plenum space under the drying floor. Drill a 4.0" (10.16cm) diameter hole centered on a valley of
the bin corrugation. Next place the limit control in the 4.0" (10.16cm) hole and match drill (4) 7/32"
(.55cm) diameter mounting holes located on the corrugation hill. Field seal around the high limit and
fasten using (4) 1/4" (.64cm) sheet metal screws located in the bolt bag to secure the High Limit to the
bin wall.
