Mammoth V-Cube Slim F-Series Sizes 180 to 350 - Manual (Page 12)

Mammoth V-Cube Slim IOM, MAMM-VCS-IOM-4FA (October 2013) 12
Electrical
Electrical Terminals
Tighten all electrical terminals per the torque value listed
on the connector. Electrical terminals are located within
the main unit control panel. Where no torque value is
given, use the tightening torques provided in this manual.
See “Electrical Terminal Tightening Torques” on page
16.
WARNING! Loose electrical terminals can
lead to erratic unit operation and arcing which
may cause fires. Tighten all electrical ter-
minals before unit startup. Be careful not to
over-tighten to avoid stripping out threads..
Motor Protector Settings
Before startup, adjust the overload setting on all motor
protectors as follows. They are located within the unit
electrical panel. See Figure 10.
1. Switch to the off position all motor protectors.
2. For motors and pumps, adjust the setting to match
the amps (FLA) listed on the motor nameplate.
3. For compressors and VFDs, adjust the setting as
indicated on the electrical wiring diagram provided
with your unit.
Figure 10: Motor Protectors
Adjust motor protector amp settings to match electrical
schematics or motor nameplates
Control Settings
•
Verify that all control jumper positions, time delay
relay settings, baud rates and control temperatures
and/or pressure settings match those indicated on
the electrical wiring diagram, as applicable. Refer to
the wiring schematics provided with your unit for loca-
tions and settings.
Verify that high and low static pressure safety settings
match those indicated on the electrical wiring diagram.
They are typically set at 3.5 inches w.c. each. Record the
values on the Startup Report form.
Refrigerant Piping
Mammoth V-Cube Slim units with DX cooling are shipped
fully charged with refrigerant from the factory. No piping
connections are needed and no field charging is required
prior to operation of the system. Check the following prior
to startup:
•
Verify that all pressure lines are free from the com-
pressors – i.e., not contacting or rubbing against
them – to prevent damage from vibration and friction.
Pressure line coils should have a distance between
each coil of at least one inch.
• Verify that all pipe clamps have the rubber lining
intact and are secure.
• Verify that all compressor service valves are open.
Startup: Power On
With the main power control panel door closed, switch on
the main power to the unit. Then carry out the following
procedures.
WARNING! Electric shock and moving equip-
ment hazard. Can cause severe injury or
death. Use extreme caution when inspecting
or servicing equipment with electrical power
supplied to the unit. Per OSHA 29 CFR
1910.333 (c)(2): “Only qualified persons may
work on electric circuit parts or equipment
that have not been de-energized. Such per-
sons shall be capable of working safely on
energized circuits and shall be familiar with
the proper use of special precautionary tech-
niques, personal protective equipment, insu-
lating and shielding materials, and insulated
tools.”
Electrical
Supply Power
•
Verify that the measured supply voltage matches the
rated voltage on the unit nameplate. The nameplate
is located on the electrical panel door. Record volt-
ages on the startup form.
Motor Rotation
•
Verify that all fans, blowers and pumps are rotating
in the correct direction. This can be accomplished
by shutting off the motors individually, using each
motor’s overload protector shut-off switch, then
observing the direction of rotation as you start them
back up.
• Check for proper rotation of each compressor using
a phase rotation meter. Also verify that the unit phase