12-7
CONTROL SYSTEM
SM OU12HP 2-E.2 GB
STANDBY
INDICATOR
Lights up when the Air Conditioner is connected to power and is ready for operation
OPERATE
INDICATOR
1. Lights up during operation.
2. Blinks for 300 msec to announce that a R/C infrared signal has been received
and stored.
3. Blinks continuously during protections (according to the relevant spec section).
TIMER INDICATOR
Lights up during Timer and Sleep operation.
COOLING
INDICATOR
Lights up when system is switched to Cool Mode by using the Mode Switch on the
unit.
HEATING
INDICATOR
Lights up when system is switched to Heat Mode by using the Mode Switch on the
unit.
Mode SWITCH
(COOL/HEAT/OFF)
Every short pressing , the next operation mode is selected, in this order : SB
Cool Mode Heat Mode SB …
In long pressing system enters diagnostic mode.
12.5 Run Mode
Run mode is the default operation mode of the system. This is the standard operation mode that
is active in field application (at customer site).
System can go from run mode to other operation modes through keyboard or serial ports.
12.5.1 Mode Setting
Mode defines the ODU operation mode. There are three possible operation modes:
1. STBY – standby mode
2. COOL - the unit operating at cooling cycle
3. HEAT - the unit operating at heat pump cycle
SB mode can be set also by dry-contact.
12.5.1.1 ODU Protections
There are 4 ODU protections:
x Compressor overheating
x Heat sink overheating
x AC over current
x DC Over curren – not in 6HP unit
12.5.2 Compressor Speed Control
12.5.2.1 Compressor Min On/Off time
Compressor minimum OFF time is 3 minutes except during Deicing protection.
Compressor minimum ON time is 3 minutes, minimum ON time is ignored during protections,
and when unit is turned to STBY.
12.5.2.2 Compressor Startup
When started, compressor speed reaches 40 RPS and will not go below that during the first 5
minutes of compressor operation except when compressor forced OFF.
12.5.2.3 Compressor start up fail
If the compressor does not succeed to complete the startup procedure, it will report a compressor-
lock fault code.
It than retries the startup procedure for 3 times on every 10 seconds and enter a 3 minutes wait
condition before starting the next compressor startup sequence.
To Next Page
Loading...
