MovinCool CM12 Service Manual - Manual (Page 25)

Operation Section
25
(5) Compressor protection (Compressor time delay control)
• Compressor protection consists of a time delay program within the microprocessor which
prevents a heavy load from being applied to the compressor motor when restarting the unit (cool
mode) after a very short period of time. This “delay” is in effect any time when the compressor
is turned on by either the COOL ON/OFF button (after the Y signal goes OFF once and then
comes back ON), or power interruption restart. (automatic recovery)
Specifications:
- Time Delay: 120 sec.
(6) Automatic restart after power interruption (Automatic Recovery Function)
• The program within the CM 12 microprocessor contains a feature that will automatically restart
the unit after power is lost and then regained. The unit also has memory in order to return itself
back to the operating mode (either manual or preset program) it was in prior to the loss of power.
Any “preset” program will also be retained in the memory in the event power loss occurs.
5.4 Relay Board
• The relay board controls the components such as the compressor and fan motor based on the
signals received from the millivolt wall thermostat and other sensors on the unit.
• It also contains a step-down transformer that converts the line voltage (115 VAC) to 12 V.
• This 12 V is then converted from AC to DC and used for relay coil activation. The 12 V (DC)
power is sent to the control panel assembly where it is further reduced to 5 V for the system logic.
• The relay board also contains the DIP switch.
< NOTE >
The relay board must be serviced as a complete assembly. It has only one serviceable
component, the fuse. (see below)
(1) Relay board fuse
• This fuse provides protection against damage to the step-down transformer. The fuse must be
replaced with the exact same part, or a suitable equivalent.
Specifications:
- 5 A 250 VAC
CAUTION
Failure to use the exact type of fuse could result in damage to the unit and/or to components. It
could also void the warranty of the unit.