ACC-APG001A-EN
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Service Test Mode
Service Test Mode can be used to initiate certain operating modes of the equipment. Refer to the
following sections for more details associated with this feature.
Service Test Timeout
Service Test Timeout (Minute) is a user selected time value. Once Service Test Mode has been
initiated, and this timer expires, the controls are forced to leave Service Test Mode and return to
normal unit operation.
• MMiinniimmuumm vvaalluuee— 1 minute
• MMaaxxiimmuumm vvaalluuee— 120 minute
• DDeeffaauulltt vvaalluuee— 60 minutes
TTiimmeerr IInniittiiaattee: When any value for Service Test State Request is chosen other than Inactive, the
controller sets the Service Test Timeout to the user selected value and the unit begins to operate
as described in the tables below. It continues in operation until the Service Test Timeout Timer
reaches 0 OORR until the user chooses a different Service Test State Request.
TTiimmeerr TTeerrmmiinnaattee: if the Service Test Timeout timer has reached 0, the controls sets the Service
Test Stage Request to Inactive and the unit returns to normal unit operation. If the Service Test
Timeout Timer has not reached 0, the user can set the Service Test Stage Request to Inactive to
exit the active Service Test State Request and return to normal unit operation.
TTiimmeerr RReesseett: if the Service Test Timeout timer has not reached 0, the user can select the Service
Test Stage Request to any value other than Inactive. The controller resets the Service Test
Timeout Timer to the user selected value and the unit operates as describe in the tables below for
the new request.
Leaving Service Test Mode
There are three ways to leave Service Test Mode:
• When the Service Test Timeout timer expires, the unit will leave Service Test Mode.
• Service Test State Request is set to “Inactive”.
• The controller goes through a power cycle or reset.
Constant Volume Supply Fan Service Test Mode
The tables below provide unit operation for each stage of service test depending on the unit
configuration.
The tables describe the service test mode states and expected unit response. For all service test
mode operation, “IN CONTROL” refers to Symbio 700 control algorithms controlling the unit. For
instance, in all service test mode states, the Condenser Fan will be controlled as needed to
ensure safe unit operation.
Table 4. Cooling Only
State #
Service Test
State Request
Service Test
Supply Fan
On/Off
Request
Service Test
Compressor
Cool Stage
Request
1,2
Service Test
Auxiliary
Heat Stage
Request
3
Service Test
Condenser
Fan Stage
Request
4
Heat Cool
Mode Status
1 Inactive IN CONTROL IN CONTROL IN CONTROL IN CONTROL IN CONTROL
2 Fan On ON 0 0 IN CONTROL TEST
3 Cool 1 ON 1 0 IN CONTROL TEST
4 Cool 2 ON 2 0 IN CONTROL TEST
5 Heat 1 ON 0 1 IN CONTROL TEST
6 Heat 2 ON 0 2 IN CONTROL TEST
7 Heat 3 ON 0 3 IN CONTROL TEST
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