Manual

HIGH PRESSURE REGULATOR

It is necessary to install a high-pressure regulator upstream of the unit if the incoming gas pressure is

greater than ½ PSIG. This item ships loose for field installation and is available in 1” and 1-1/4” diameter

pipe sizes.

HIGH AND/OR LOW GAS PRESSURE SWITCH

As an option these switches are available to monitor high, low or high & low gas pressure to the burner.

If improper gas pressure is measured than the burner circuit is de-energized.

COIL COMPARTMENT (WITH OR WITHOUT COIL)

An insulated coil section for a chilled water coil can be factory installed. Housing includes access door,

drain pan and selected coil (if required). The coil compartment is custom-designed to fit the coil selected

and the unit housing size.

EVAPORATIVE COOLING SECTION

This section includes the housing, evaporative cooling media, submersible pump, float valve, overflow

coupling, drain pipe, flush valve and flow meter.

DISCHARGE LOUVERS

A field installed louver, with vertical and horizontal blades, which is designed to discharge air in four

directions. The blades are installed 2" apart, and can be manually adjusted to set direction of air flow.

CONTROLS DESCRIPTION & TESTING

1. LOW TEMPERATURE LIMIT SWITCH

This is a freeze protector. If the unit supply temperature is below the setting of this controller, it

will open the circuit (R-W) shutting the unit operation down and close the circuit (R-B) lighting the

optional “ALARM” light of the remote control panel. It also has a bypass timer that allows the unit

to run on a cold start without shutting it down.

Temperature Adjustment

Set: 40

. Bulb location in supply air duct of unit.

Test: Adjust setting above discharge temperature. The unit will shut down. (

NOTE:

For ease of

testing run blower only.)

Timer Adjustment

Set: 5 minutes.

Test: Set timer at "0" minutes. The control circuit will be through low temp limit. Turn low temp limit up

and the unit will shut down. Set timer at 5 minutes; reset timer and adjust low temp limit to 40

setting and the unit will continue to operate through the time contacts. To reset timer turn power

"OFF" and back "ON".