– 8 –
SECTION IV - PRE START-UP
Do not attempt start-up without completely reading
and understanding this manual, along with the
Digital Control Sysem user manual.
A. Pre Start-Up
The owners representative or equipment operator
should be present during start-up to receive instruc-
tions on care and adjustments of the equipment.
All equipment has been factory tested, adjusted,
metered and inspected to meet conditions set at
the time the order was placed. Only minimal
adjustments should be required. All information
in this service manual is typical. All products are
semi-custom and changes may occur.
Suggested Tools and Instruments
Volt/Ohm Meter
Thermometer
Tachometer Ammeter
Manometer (0-10" W.C.)
Microammeter
Standard Hand Tools
D.C. Volt Meter
Gas Pressure Gauge (0-35 lbs.)
BACview 6
CAUTION: Line side of disconnect may be energized.
Follow proper “lockout/tagout” procedures.
NOTE: All servicing and adjustments of the Direct
Gas-Fired unit should be performed by a qualifi ed
service engineer.
Perform a visual inspection, internally and externally,
to make sure no damage has occured and that
everything is secure. This inspection is very important
and should be completed with greatest care given to
detail. A good pre-start inspection will insure against
possible unit damage on start-up and will save
valuable analysis time.
1. Check that the physical condition of the unit
exterior is acceptable.
2. Check that the insulation inside of unit is properly
secured.
3. Remove all shipping blocks, brackets and bolts
from supply fan base with optional isolation base.
4. Check all wiring for loose connections and tighten
if necessary.
5. Inspect all fan and motor bearings and lubricate if
necessary.
CAUTION: DO NOT RUPTURE GREASE SEALS.
6. Inspect pulleys and belts for tightness, tension and
alignment.
Do not overtighten belts.
7. Check set screws on all bearings, pulleys, fans and
couplings for tightness.
8. Check voltage supplied to disconnect switch; the
maximum voltage variation should not exceed
± 10%. Phase voltage unbalance must not exceed 2%.
9. Check thermostat(s) for normal operation.
10. Check that system duct work is installed and free
from obstructions.
11. Check that fans turn free in housing.
12. Check that the area around the unit is clear of
fl
ammable vapors or containers of
fl
ammable
liquids.
13. Check that all piping connections, particularly
unions, are tight. Check all gas piping for leaks
using a soap bubble solution. The most common
types of problems found relative to the gas train
itself is foreign material within the gas piping. This
will interfere with the proper operation of the gas
train components and burner. Purge all air from
gas lines per gas codes.
14. Check that all accessories requiring
fi
eld wiring
have been properly installed.
15. Check burner for proper location and alignment.
16. Check that
fi
lters,
fi
lter stops, accessories and ship
loose items are installed correctly.
17. Check that vent lines (if applicable) are run to
atmosphere on gas regulators and pressure
switches for indoor units. Vent lines should
terminate outside the building, with a turndown
elbow and bug screen. Note that some units will
use vent limiters and vent lines are not required.
If vent lines are even partially plugged, this will
interfere with proper venting of pressure control
devices.
18. Check that all manual gas shut-off valves are closed.
19. When failure or malfunction of this heater creates a
hazard to other fuel burning equipment, (e.g. when
the heater provides make-up air to a boiler room),
the heater is to be interlocked to open inlet air
dampers or other such devices.
20. Motor overload relay setting should match the
motor’s nameplate full load amperage.
21. Check that dampers and linkages are free to move,
and that linkages are tight.
22. The unit may require that a Return Air
fl
ow Station
be
fi
eld installed. Be sure all tubing connections
are in the correct location as shown in drawing
#C000643.
23. Check to ensure all manual reset safety devices
have been reset and limits are in the normal
operating position.
24. If inlet duct is attached to the heater, a purge
timer must be provided and set to purge 4
times the inlet duct volume.
Purge time in seconds = 4 x L x W x H x 60
SCFM
L = duct length in feet, W = duct width in feet,
H = duct height in feet, SCFM = rating plate air
throughput.
Refer to the electrical schematic for the proper
circuit placement. Purge timer P/N 65.0711.00.
