Before requesting start-up, check that the installation is complete and unit is ready. Complete the pre start-up
below (if items are applicable) and the checklist in Appendix C
for each unit. For torque values on set screws, belt tension, etc. check under Operation and Maintenance.
1. Check the electrical disconnect is in 1. the ‘Off’ position.
2. Check the split section joints are properly installed on multi-section units.
3. Check that all holes that have been made by the
Installing Contractor after receiving the unit in the casing, partitions or floor have been well sealed to prevent air and/or water infiltration.
4. Check the unit for obstructive packaging, objects near or in fans, dampers, etc.
5. Remove all retaining bolts on fan bases.
a. Check that the fan impellers are rotating freely.
b. Check fan impeller and drive set screws. Tighten if required.
c. Check the fan bearing set screws or locking collars. Tighten if required.
d. Check fan belt alignment and tension.
6. Check that the air filters are installed and clean.
Replace if necessary. See
Appendix D for optional
downstream high efficiency HEPA filter installation (if supplied).
a. Check all face-mounted filters are attached with four clips each.
b. Check each sliding filter has a retainer at the end track and well attached blank-offs.
c. Check that the filter pressure differential gauges, switches or sensors are free of dirt and set at a value satisfactory to the end user to trigger a filter change.
7. Check coils if fins have been damaged in shipping, installation or building construction and are clean.
Straighten fins with fin comb and clean coil if required.
a. Check all pipe connections are tight and that no damage has occurred during shipping or installation.
b. Check that the piping to the coils and WCC have been completed, piping lines have been flushed, filled, vented and tested at 1.25 times the operating pressure.
c. Refer to
Appendix A for WCC piping installation
and check that it is complete.
Start-up
Pre.Start-up.Check
8. Scroll compressor RIS vibration isolator bolts are factory tightened to the correct torque setting for operation and do not require field adjustment.
a. Check that refrigerant components and piping are in good condition and have no damage or leaks from shipping or installation.
b. Check that the clearance around the water cooled condenser (WCC) is in accordance with minimum recommended clearances.
9. Check motorized damper control arms, control rods and shafts for tightness.
a. Check that non motorized dampers rotate freely.
10. Check that ductwork is connected, complete and free of obstructions.
11. Check that condensate drain connections have been trapped, installed correctly and filled.
12. Check that all shipped loose or field supplied components have been correctly installed and wired.
13. Check that the wiring diagram has been marked up accordingly and left with the unit.
14. Check that all power supplies and control wiring have been inspected and approved by the Local Authorities having jurisdiction.
15. Check all factory and field wiring connections for tightness. Tighten if necessary.
16. Check that all fuses are properly installed in holders.
17. Check the voltage at the disconnect switch against the nameplate and against phase-to-phase readings on three-phase. If the voltage is not within 10% of rated or 2% of phase-to-phase, have the condition corrected before continuing start-up.
18. Check that all field piping and venting installation and connections for the heating and cooling options have been completed and tested.
19. Set the heating and cooling enable switches to the
‘Off’ position.
VCES-V-CUBE-IOM-1A 14
To ensure proper operation of each unit, qualified personnel 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 information for personnel performing future maintenance.
IMPORTANT
• A completed copy of the Start-up Report and
Checklist must be sent back to the factory for warranty 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 documents. 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 energizing 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 according to sequence and to adjust setpoints while power is on for start-up and while performing service.
• All units are factory run tested. Fans, compressors and condenser fans (if equipped and refrigerant piping 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, disconnect 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.
Start-up.Procedure
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 startup.
8. Check amperage draw to each motor on each phase against motor nameplate FLA. If significantly different check ductwork static and/or take corrective action.
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 compressor 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 exchanger. Check the incoming line water pressure to ensure it is within design and acceptable limits.
11. Enable cooling and check that compressors and condenser 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 piping 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 operation guide against the sequence of operation, adjust and record changes as required.
16. When unit has achieved steady state take measurements 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 volumes. See Airflow Balancing for further information.
19. Send copy of the completed start-up reports to Venmar CES to validate warranty. Maintain a copy of the reports at the unit for future reference.
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.
VCES-V-CUBE-IOM-1A 15
