Specifications

– 17 –
SUGGESTED TOOLS AND INSTRUMENTS
Volt/Ohm meter
Tachometer
Stack & Temperature Thermometer
Gas Pressure Gauge
Ammeter/Amprobe (or equal)
U-Tube Manometer (0 – 10” W.C.) Two Required
Flue Gas Test Equipment
Standard Hand Tools
D.C. Volt Meter
SUGGESTED CONTROLS SETTINGS
FL-01 Fan Control………..…………….... 95
o
– 110
o
F
FL-02 High Limit (IFR Down Discharge) ...…….165
o
F
FL-02 High Limit (All Other Units) ……......…….200
o
F
FL-04 Auxiliary High Limit …………….....…….210
o
F
PS-01 Draft Proving Switch.....Adjust to field condition
PS-02 Burner Proving Switch..Adjust to field condition
PS-04 Low Gas Pressure Switch……….…..1.0” W.C.
PS-07 High Gas Pressure Switch………125% above
burner firing rate
PS-10 Main Air Proving Switch Adjust to field condition
PS-12 Clogged Filter Switch….Adjust to field condition
RE-21 Time Clock……………..…Customer Discretion
TC-01 Room Thermostat ……… Customer Discretion
TC-02 Modulating Discharge Ductstat…….…… 70
o
F
TC-03 On-Off Inlet Ductstat…………………...….65
o
F
TC-06 High Limit Discharge Ductstat…………. 100
o
F
TC-07 Low Limit Discharge Ductstat…….…....…60
o
F
TC-08 Freeze Thermostat………....45
o
F & 3 Minutes
TC-09 Night Setback Thermostat.Customer Discretion
BEFORE ATTEMPTING TO START THE HEATER, READ THE TYPICAL
SEQUENCE OF OPERATION AS SHOWN BELOW:
Typical Sequence Of Operations Note: This se-
quence is written for only the burner safety and operat-
ing portion of the heater. Other control systems for
dampers, mixing boxes, and temperature controls are
included in the unit typical sequence of operation and
/ or wiring diagram:
1. With main supply air fan(s) on, thermostat calling for
heat, and all switches and operating controls in their
normal position, the exauster motor and burner motor
will run and "pre-purge" the combustion chamber.
Pre-purge timing is not adjustable and is approxi-
mately 90 seconds.
2. With pre-purge timing complete, the pilot solenoid
valve and ignition transformer are energized. The
pilot flame will be established and sensed by the
flame sensor.
3. Ignition transformer is de-energized and pilot valve
remains on.
4. Main fuel valve(s) will open. The main burner flame
will be established.
5. Pilot valve is de-energized. (This is only on heaters
with interrupted pilots).
6. Once thermostat is satisfied, the main fuel valve(s),
burner motor, and exhauster motor will be
de-energized. Main supply air fan(s) will continue to
run.