Applied Air GAS-FIRED HEATERS, Installation & Operation Instruction

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SECTION IV – PRE START-UP
Do not attempt start-up without completely reading
and understanding this manual, along with the
Digital Control System user manual (if applicable).
Pre Start-Up
The owners representative or equipment operator should
be present during start-up to receive instructions 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 prod-
ucts are semi-custom and changes may occur.
CAUTION: Line side of disconnect may be energized.
Follow proper “lockout/tagout” procedures.
NOTE: A qualifi ed service engineer should perform all
servicing and adjustments of the Indirect Gas-Fired
unit.
Perform a visual inspection, internally and externally, to
make sure no damage has occurred and that everything
is secure. This inspection is very important and should be
completed with great 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 any insulation inside the unit is properly
secured.
3. Remove all shipping blocks, brackets and bolts from
supply fan base with optional isolation base.
4. Check all terminals for loose connections and inspect
all wiring terminations to insure that all crimped con-
nections are tight.
5. Inspect all fan and motor bearings and lubricate if
necessary.
CAUTION: DO NOT RUTURE 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 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 of
obstructions.
11. Check that fans turn freely in housing.
12. Check that the area around the unit is clear of fl am-
mable 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 free of 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 any
ship loose items are installed properly.
17. Check that vent lines (if applicable) are run to atmo-
sphere 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 con-
trol 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 any dampers or mixing boxes (if supplied).
Make sure all damper linkage is free to move and no
binding will occur. If dampers are of the modulating
type, check control capillary tubes to insure that the
tubes and bulbs are in the proper location and will not
rub against any other parts.
22. Check to ensure all manual reset safety devices have
been reset and limits are in the normal operating posi-
tion.
23. Check to ensure the fl ue stack is installed properly
and is free of obstructions.
24. Adjust the induced draft damper so it is approximately
75% open.
25. Remove shipping screw from rear relief door (if ap-
plicable).
26. Check that all fuses are installed.
27. Check that inlet gas pressure is the same as shown
on the rating plate.
28. Check that fi eld wiring connections to the burner mo-
tor and draft inducer motor are connected to the cor-
rect starters.