Setting The Motor Current - Braemar Down Series Owners Manual Installation, Operating & Service Instructions

11
INSTALLATION

Setting The Motor Current

13
Important! The motor pulley and belt
tension need to be adjusted to ensure
that the motor is running at its rated
capacity.
If the current is set to low, the cooler
w i l l n o t p e r f o r m t o i t s o p t i m u m
capacity, and the motor speed control
may not work effectively.
The RPC two Speed units need to
have full load amps checked on high
and low speeds.
Before setting the current please
ensure that;
- The electronics module is fitted securely, and all leads have been connected
correctly.
- All ducting and registers are in place.
- Windows and doors in rooms are opened sufficiently, and
- All pad frames except the ones on the motor side and pulley side are in place.
1..... Run the motor at maximum speed by operating the cooler with the wall control
set to MANUAL mode, maximum fan speed, ventilation only. WARNING! Ensure
that the pump is not running.
2...... Continue running the motor for ten minutes (warms up the motor) before
proceeding with the current measurement. During this period carry out general
system checks including airflow, etc.
3...... Measure the motor current with a clamp meter. Attach the clamp meter
around one of the motor cables as shown (fig 13).
Compare the measured current with the rated current located on the motor. If the
measured current is less than, or greater than the rated current, the adjustable
pulley should be altered accordingly. Refer heading Pulley Adjustment.
The measured current should be equal to, or within half an amp below that of the
rated current. It must never be more than the rated current.
Replace all covers and switch off clamp meter when adjustments are made.