Start-Up Procedure - Modine Manufacturing DBP Installation And Service Manual

unit installation / start-uP Procedure
operation
general - all coils
1. Proper air distribution is vital to coil performance. Air flow
anywhere on the coil face should not vary by more than
20%.
2. Air velocities should be maintained between 200 and 550
feet per minute.
3. For chilled fluid coils, fluid velocities should be maintained
within the recommended values of 1 to 8 fps for Water and
1 to 6 fps for Glycol solutions.
chilled fluid coils - initial start-up
1. Open all air vents so that air is eliminated from within the
coil circuitry and headers. Verify that all vents and drains
are not obstructed and do discharge a stream of water.
2. Fill the coil with water then close all vents.
3. Perform an initial hydrostatic leak test of all brazed,
threaded or flanged joints, valves and interconnecting
piping. Recheck the coil level and correct if necessary.
When the setup is found to be leak free, discharge and
discard initial water charge. It is important that all grease,
oil, flux and sealing compounds present from the
installation be removed.
maintenance
general
1. Filters should be inspected on a regular basis and
changed as needed. Maintaining clean filters is a cost-
effective way to help maintain maximum coil performance
and service life.
2. Periodic inspection of the coil for signs of corrosion and for
leaks is recommended. For DX coils, Small leaks can be
detected using a Halide torch. Repair and replacement of
the coil and the connecting piping, valves, etc., should be
performed as needed by a qualified individual(s).
3. Should the coil surface need cleaning, caution should be
exercised in selecting the cleaning solution as well as the
cleaning equipment. Improper selection can result in
damage to the coil and/or health hazards. Clean the coil
from the leaving air-side so that foreign material will be
washed out of the coil rather than pushed further in. Be
sure to carefully read and follow the cleaning fluid
manufacturer's recommendations before using any
cleaning fluid.
4. For DX coils, the use of filter-dryers in the system piping is
recommended along with a sight glass that has a moisture
indicator. Replace the filter dryer(s) as needed.
5. For chilled fluid coils,
A) Maintain the circulated fluid free of sediment, corrosive
products and biological contaminants. Periodic testing
of the fluid followed by any necessary corrective
measures along with maintaining adequate fluid
velocities and proper filtering of the fluid will help to
satisfy this goal.
B) Automatic air vents must be utilized to remove
accumulated air.
C) Freeze Protection - During the winter, chilled water coils
need to be protected against freezing. The two
predominant protective measures are 1) Blowing-out
the coils with air or 2) Flushing coils with inhibited
glycol. It is recommended to use inhibited glycol
designed for HVAC applications for corrosion
protection. Select an inhibited glycol solution that will
protect the coil from the lowest possible temperatures
that can occur at the particular coil's locality.
12

start-up Procedure

IMPORTANT
1. To prevent premature heat exchanger failure, observe heat
exchanger tubes by looking at the heat exchanger through
the field installed access openings in connecting ductwork
in blower package units or the unit access doors in
cooling package units. If the bottom of the tubes become
red while blower and duct furnace are in operation, check
to be sure the blower has been set to the proper rpm for
the application. Refer to page 15 for Blower Adjustments.
2. Start-up and adjustment procedures should be performed
by a qualified service agency.
1. Turn off power to the unit at the disconnect switch. Check
that fuses or circuit breakers are in place and sized
correctly. Turn all hand gas valves to the "OFF" position.
2. Remove the blower exterior panels and open the electrical
compartment door.
3. Check that the supply voltage matches the unit supply
voltage listed on the Model Identification plate. Verify that
all wiring is secure and properly protected. Trace circuits to
insure that the unit has been wired according to the wiring
diagram.
4. Check to insure that the venting system is installed and
free from obstructions.
5. Check to see that there are no obstructions to the intake
and discharge of the unit.
6. Check the belt tension and sheave alignment. Refer to
Blower Adjustments for proper belt tension.
7. Check bearings for proper lubrication. For units provided
with pillow block bearings (See Model Nomenclature), refer
to Lubrication Recommendations for lubrication requirements.
8. Check to make sure that all filters are in place and that they
are installed properly according to direction of air flow.
9. Perform a visual inspection of the unit to make sure no
damage has occurred during installation.
10. Turn on power to the unit at the disconnect switch. Check to
insure that the voltage between duct furnace electrical box
terminals 1 and 2 is 24V.
11. Check the thermostat, ignition control, gas valve, and
supply fan blower motor for electrical operation. If these do
not function, recheck the wiring diagram. Check to insure
that none of the Control Options have tripped.
12. For units with a return air damper, the return air damper
linkage needs to be adjusted. Refer to Damper Linkage
Adjustment.
13. Check to make sure that the damper opens properly
without binding.
14. Check the blower wheel for proper direction of rotation
when compared to the air flow direction arrow on the
blower housing. Blower wheel rotation, not air movement,
must be checked as some air will be delivered through the
duct furnace with the blower wheel running backwards.
15. Check the blower speed (rpm). Refer to Blower
Adjustments for modification.
16. Check the motor speed (rpm).
17. Check the motor voltage. On three phase systems, check
to make sure all legs are in balance.
18. Check the motor amp draw to make sure it does not
exceed the motor nameplate rating. On three phase
systems, check all legs to insure system is balanced.
5-565.1