Mammoth 800 to 5500 CFM: Dedicated Outdoor Air System with Enthalpy Wheels (VHC) - Manual (Page 32)

MAMM-VHC-IOM-1A (JANUARY 2013) 32
Table H2: Start-up Checklist
Checklist Item Yes N/A
1 Before proceeding, complete the pre start-up checklist.
2 Close all access panels or doors.
3 Turn the main disconnect to the ‘On’ position.
4
Set the timer, selector switch or BMS to close the contact for the scheduling mode desired and check opera-
tion and sequence.
Occupied ventilation (Ov): With the occupancy contact closed or a jumper placed across terminals, heat wheel
starts (not in free cooling), defrost recirculation damper closes (if equipped), outside and exhaust air dampers
(if equipped) begin to open; after outside air damper opens fully the blower starts and after the exhaust air
damper opens fully the exhaust blower starts.
Unoccupied recirculation (Ur): With the unoccupied recirculation contact closed or a jumper placed across ter-
minals, heat wheel stops, defrost recirculation damper opens, outside and exhaust air dampers (if equipped)
begin to close and supply blower starts.
Occupied recirculation (Or) (DDC controls package only): With the occupied recirculation contact closed or
a jumper placed across terminals, heat wheel starts (not in free cooling), defrost recirculation damper closes
(if equipped), outside air damper (if equipped) opens; after outside air damper opens supply blower starts,
exhaust air damper (if equipped) opens. After exhaust air damper opens exhaust blower starts, occupied recir-
culation damper opens, outside and exhaust air dampers modulate to the damper minimum setpoints.
5 Are dampers operating properly?
6 Are fans and heat wheel rotating in the correct direction?
7
For occupied recirculation mode adjust outside air and exhaust air damper positioner to achieve the required
air volume.
8
Re-check the voltage at the disconnect switch against the nameplate and against phase-to-phase readings on
three-phase with all blowers operating. If the voltage is not within 10% of rated or 2% of phase-to-phase have
the condition corrected before continuing start-up.
9
Check amperage draw to each motor on each phase against motor nameplate FLA. If significantly different
check ductwork static and/or take corrective action.
10 Before activating the compressor on WSHP units, are water shut-off valves open and is water circulating
through the water-to-refrigerant heat exchanger.
11 Enable cooling and check if the sound of the compressor is normal or if there is excessive vibration.
12 Check all field and factory refrigerant and water piping connections for leaks and correct.
13 Enable heating options, see start-up and check out instructions in
Appendix J for electric coil and complete.
14 Check the operation of the control options provided on the unit.
15 Check the setpoints on the DDC Points Reference, adjust and record changes as required.
16 When unit has achieved steady state take measurements and complete readings section of start-up report.
Serial Number: __________________________________