Mammoth V-Cube - Manual (Page 15)

Start-up.Procedure
To ensure proper operation of each unit, qualified person-
nel should perform the start-up as outlined below (based
on options included with unit) and complete the Start-up
Report and Checklist in
Appendix C for permanent record.
A completed report and checklist will provide valuable in-
formation for personnel performing future maintenance.
1. Before proceeding complete the Pre 1. Start-up
Checklist.
2. Check that all access panels or doors are closed.
3. Open the access door to the main control panel to
access the keypad interface device.
4. Bump-start the unit to verify that the fan wheel(s) are
rotating in the correct direction.
5. Set the keypad to occupied mode with heating and
cooling disabled and fan(s) enabled.
6. Check that dampers are operating properly.
7. Recheck the voltage at the disconnect switch against
the nameplate and against phase-to-phase readings
on three-phase with all fans operating. If the voltage
is not within 10% of rated or 2% of phase-to-phase
have the condition corrected before continuing start-
up.
8. Check amperage draw to each motor on each phase
against motor nameplate FLA. If significantly differ-
ent check ductwork static and/or take corrective ac-
tion.
9. Feel the compressor crankcases. They should be
warm if the disconnect has been on for at least 24
hours. This will assure that no refrigerant liquid is
present in the crankcase which could cause compres-
sor damage or failure to occur on start-up.
10. Before activating the compressor(s), ensure that any
water shut-off valves are open and that water is
circulating through the water-to-refrigerant heat ex-
changer. Check the incoming line water pressure to
ensure it is within design and acceptable limits.
11. Enable cooling and check that compressors and con-
denser fans are rotating in the correct direction.
12. Check if the sound of the compressor is normal or if
there is excessive vibration.
13. Check all field and factory refrigerant and water pip-
ing connections for leaks and correct.
14. Check the operation of the control options provided
on the unit.
15. Check the reference setpoints on the keypad opera-
tion guide against the sequence of operation, adjust
and record changes as required.
16. When unit has achieved steady state take measure-
ments and complete the readings section of the
start-up report in
Appendix C .
17. Set the keypad to each mode of operation and check
the operation according to sequence.
18. For recirculation scheduling mode the outside air and
exhaust air dampers must be adjusted during start-up
to achieve the required outside and exhaust air vol-
umes. See Airflow Balancing for further information.
19. Send copy of the completed start-up reports to Ven-
mar CES to validate warranty. Maintain a copy of the
reports at the unit for future reference.
IMPORTANT
• A completed copy of the Start-up Report and
Checklist must be sent back to the factory for war-
ranty validation and for factory assistance.
• General information on the factory installed and
programmed DDC control system regarding the
navigation and monitoring of the unit with the
standard keypad are provided in separate docu-
ments. For more specific information regarding the
sequence of control, the different options of control
or network communications, see these documents
included with the unit in the control panel pocket.
• If units are equipped with compressors, power must
be turned on for 24 hours prior to a call for cooling,
for the compressor crankcase heaters to be energiz-
ing to prevent possible damage.
!
WARNING
• Electric shock can cause personal injury or death.
• Only qualified service personnel should install and
service this equipment.
• The keypad must be used to check operation ac-
cording to sequence and to adjust setpoints while
power is on for start-up and while performing ser-
vice.
• All units are factory run tested. Fans, compressors
and condenser fans (if equipped and refrigerant pip-
ing is not split for shipment) are set up to run correct
when power is connected. If any one fan is running
backwards or compressor is making loud noises, dis-
connect power and switch two leads (on three-phase
power) to ensure proper rotation and avoid damage.
With multi-section units with split wiring connections
check rotation of fans, compressors and condenser
fans for correct rotation to ensure wiring connections
are correct.
VCES-V-CUBE-IOM-1A 15