Chapter 3: System Operation
Executing the Step-Test
Page 49
Executing the Step-Test
The step-test systematically verifies that key components of the system are operating as expected. Note the
following considerations:
The steps in the test can be executed in any order; they do not need to be sequential.
The test must be completed within 30 minutes. If you cannot complete it in that time, you will need to re-enter
the step-test mode.
The system will display the main menu (indoor temperature) automatically after ten minutes when there has
been no input from the technician.
PLD button actions are listed in more detail on page 41. If any alarms are triggered during the test, refer to Alarms
on page 50 for details.
Warning. Once a compressor has been turned on, it must be allowed to run for at least one minute before
the next step to prevent compressor damage.
To complete the test, follow these steps:
7. Press Up and Down together to enter the main screen. The screen will display the indoor temperature. If the
indoor temperature does not display, press both buttons again and repeat as needed.
8. When the system is on, press and hold Up and Sel together for 3 seconds. The user terminal will display
Sft. Press Up until COD displays. When the system is off, press Up and Sel together for 3 seconds and
the user terminal will display COD.
9. With COD displayed on screen press Sel to confirm. The screen will display 0. Press Up to select
appropriate step (1-8; see Table 13: Step-Test below). Press Sel to confirm selection. The user terminal
returns to COD and the component will be engaged. Repeat these steps as needed.
10. When the step-test is complete, return to the main menu and turn the HVAC system on.
Table 19: Step-Test
May take a few minutes before you feel warm air
IMPORTANT: Let compressor run for at least one minute before
going to next step
HINT: With the lights off in the shelter, you can see indirect
daylight via opening behind exhaust grill
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