Subzero SZ-7575 Quick Start Manual
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Subzero SZ-7575 Quick Start Manual

Package a/c controller
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PACKAGE A/C CONTROLLER SZ-7575

No. of switches:

1. OFF
- To switch off blower
2. FAN - To start the system in fan mode where only blower will be on.
3. COOL - To start the system in cool mode where actually controller will work depending on
set point setting.
4. ALARM ACK- To mute the buzzer.
5. Up/Dn – These allows to adjust the set point to desired value.
At power on, the controller will start in the last mode it was set in before being powered off. There
are 3 states in which the controller can be at power on.

State 1

Controller is in the OFF mode. In this state, all devices are OFF and the system is in Stand By
mode and controller will display the temperature.

State 2

Controller is in FAN mode. In this state, only Blower will activate and controller will display the
temperature.

State 3

Controller is in COOL mode. In this state, system will start activating all devices as required.
:

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Summary of Contents for Subzero SZ-7575

  • Page 1 PACKAGE A/C CONTROLLER SZ-7575 No. of switches: 1. OFF - To switch off blower 2. FAN - To start the system in fan mode where only blower will be on. 3. COOL - To start the system in cool mode where actually controller will work depending on set point setting.
  • Page 2 To start the system, press the COOL key. Controller starts the BLOWER and COND FAN 1 & 2 enter time delay mode. COND FAN1 activates after 60 seconds and COND FAN2 after 90 seconds. After COND FAN 1 activates, COMP 1 energises ten seconds later to avoid a surge. After COND FAN 2 activates, COMP 2 energises fifteen seconds later to avoid a surge.
  • Page 3 time delay. Display will indicate corresponding fault. For eg incase of COND FAN O/L error, display will show “OL” and COND FAN 1 red led will blink . Green led indicates active status ( blinks while in time delay and lights up for on condition) Red led indicates inactive status (blinks for errors and light up for off condition) LED Indication : Red led on- off status...
  • Page 4 A / 250Vac...

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