Mammoth V-Cube - Manual (Page 26)

Motors
Motors will operate effectively for years if they are kept
clean, dry and properly lubricated. An excessive running
current is a good indication of the overall condition of the
motor. Check the following items every six months (unless
otherwise indicated) for proper performance:
• Motors must be cleaned with moderate air pressure
(around 25 to 30 psi). Dirt must be blown away from
vent fins and all other accessible areas. All areas sur-
rounding the motor must be kept clear so air can
circulate freely to cool the motor.
• Ensure all connections are secure. Look for loose
wires and loose contacts. Repair and tighten any de-
fective connection.
• Ensure the motor is operating at the current indi-
cated on the nameplate. If not, a physical or electrical
restriction is working against the motor and it must
be repaired.
• Ensure the motor is not vibrating too much. A signifi-
cant vibration can come from a loose mounting bolt
or an unbalanced impeller. If significant vibration has
occurred, be sure to repair it and inspect the mount-
ing base and the flexible duct connection for any
damage.
• Motor lubrication must occur once a year when
grease nipples are provided with a premium quality
lithium based grease conforming to NLGI Grade 2 or
3 (examples are Mobil Mobilith AW2, Chevron Amo-
lith#2, Texaco Premium RB, Shell Alvania #2 or Esso
Beacon #325). Clean the grease nipple first, then
rotate the motor shaft slowly by hand while adding
grease with a low pressure grease gun. Do not over
lubricate!
Filters
Standard 2” [51 mm] and 4” [102 mm] prefilters are dis-
posable and should be replaced every three months or
sooner if the pressure drop across the filters is too great.
High efficiency filters (optional) should be replaced when
dirty. Venmar CES recommends that they be used only in
combination with 2” [51 mm] or 4” [102 mm] prefilters
in order to protect them from premature clogging and to
increase their effective lifespan. The tables in
Appendix J
provide data relative to the pressure drop across clean fil-
ters and indicate the type of reading that should be given
on the magnahelic gauge. The data relative to accurate
pressure drop across the filters is available in the submit-
tal. If the system is equipped with both prefilters and final
filters, it is recommended that prefilters be changed twice
as often as final filters. Running a unit with dirty and inef-
ficient filters will lower the airflow and thus lower the air
quality of the area.
Coils
Dirt on the surface of the coil reduces its ability to transfer
heat which lowers the efficiency of the unit, resulting in
poor air quality and expensive operating costs. Because of
the condensate on the coil, the dirt often becomes wet
and contributes to the growth of microbial organisms.
Negligence in maintenance may result in serious health
related indoor air quality problems. The coil should be
kept clean for maximum performance. To achieve maxi-
mum efficiency, clean the coil often during periods of high
demand or when dirty conditions prevail. Venmar CES
recommends cleaning the coil a minimum of once per year
to prevent dirt buildup in the coil fins where it may not be
visible.
!
WARNING
Many of the following steps need to be performed with
the unit powered off and locked out. Disconnect the
main power switch to the unit before performing service
and maintenance procedures.
CAUTION
Do not use acidic chemical coil cleaners. Do not use alka-
line chemical coil cleaners with a PH value greater than
8.5 or lower than 6 (after mixing) without using an alu-
minum corrosion inhibitor in the cleaning solution. Using
these types of cleaners may result in unit damage. Coil
fins can be cleaned by using steam with detergent, hot
water spray or a commercial chemical coil cleaner. After
cleaning the coil, be sure to rinse thoroughly.
VCES-V-CUBE-IOM-1A 26