Mammoth 800 to 5500 CFM: Dedicated Outdoor Air System with Enthalpy Wheels (VHC) - Manual (Page 11)

MAMM-VHC-IOM-1A (JANUARY 2013) 11
To ensure proper operation of each unit, qualified person-
nel should perform the start-up and complete the checklist
below and the start-up report in Appendix H for permanent
record. A completed checklist will provide valuable informa-
tion for personnel performing future maintenance.
All units are factory run tested. Blowers, heat wheel and
compressors (if equipped) are set up to run correct when
power is connected. If any one blower is running back-
wards or compressor is making loud noises disconnect
power and switch two leads (on three-phase power) to en-
sure proper rotation and avoid damage.
If units are equipped with compressors power must be
turned on for 24 hours prior to a call for cooling, for the
compressor crank case heaters to be energizing to prevent
possible damage.
The BacStat II interface module (if equipped with DDC con-
trol package and mounted remotely) may be temporarily
connected at the unit for checkout. Ensure it is connected
to the Net 2 contacts otherwise it will not give readings.
1. Before proceeding complete the pre start-up check-
list.
2. Check that all access panels or doors are closed.
3. Turn the main disconnect to the ‘On’ position.
4. Set the timer, selector switch or BMS contact to the
ventilation control scheduling mode selected and
check operation according to sequence. Only one of
the following modes selected can have their contacts
closed or jumped.
a. Occupied ventilation (Ov): With the occupancy
contact closed or a jumper placed across termi-
nals, heat wheel starts (not in free cooling), de-
frost recirculation damper closes (if equipped),
outside and exhaust air dampers open fully,
the supply blower starts and after exhaust air
damper opens fully, the exhaust blower starts.
b. Unoccupied recirculation (Ur): With the unoc-
cupied recirculation contact closed or a jumper
Start-up Procedure
IMPORTANT
A completed copy must be sent back to the factory for
warranty validation and for factory assistance.
Before requesting start-up, check that the installation is
complete and unit is ready. Complete the pre start-up
check list below and in the Appendix H for each unit as
items are checked.
1. Set the electrical disconnect to the ‘Off’ position.
2. Check the unit for obstructive packaging, objects near
or in blowers, dampers, heat wheel, etc. Remove all
red tie down bolts on fan assemblies and heat wheel if
so equipped.
3. Check that the fans and heat wheel are rotating
freely.
4. Check blower wheels and drive set screws. Tighten if
required.
5. Check belt alignment and tension.
6. Check that the air filters are installed and clean. Re-
place if necessary.
7. Check coils (if equipped) if fins have been damaged
in transit or construction and are clean. Straighten fins
with fin comb and clean coil if required.
8. Check the refrigerant components and piping that they
are in good condition and have no damage or leaks
from shipping or installation.
9. Check that the water strainer has been installed for a
WSHP with a brazed heat exchanger.
10. Check that ductwork is connected and complete.
11. Check that condensate drain connections have been
trapped, installed correctly and filled.
12. Check that all shipped loose or field supplied compo-
nents have been correctly installed and wired and that
start interlocks have been completed for the ventilation
control desired.
13. Check that the standard field wiring (FW) terminal
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 tight-
ness. 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 test.
19. Set the heating and cooling enable switches to the
‘Off’ position.
Start-up
Pre Start-up Procedure