User manual CARRIER 30BQ050-070SEL

[. . . ] 1--2 1. 4. 17 Lower Air (Fresh Air Make Up) . 2--1 2. 1. 1 Refrigeration Unit -- Front Section . 2--1 i T-340 TABLE OF CONTENTS - Continued PARAGRAPH NUMBER Page 2. 1. 3 Evaporator Section . 2--3 2. 1. 5 Air--Cooled Condenser Section . [. . . ] NOTE P6--6 through P6--10 tests are conducted by changing the status of each individual valve and comparing suction pressure change and/or compressor current change with predetermined values. The tests will cause the compressor and condenser fans to cycle on and off as needed to generate the pressure required for the individual pre--trip sub tests. The compressor will start in order to build discharge pressure, followed by a compressor pump down sequence. At the conclusion of the compressor pump down sequence, the compressor will shut down and the valve test will start. Economizer Passes if suction pressure increases a minimum of 4 psi when the valve opens P6--6 Valve Test for 15 seconds. Passes if pressure and current changes are within 3 seconds of DUV switch sigDigital Unloader nal and either the pressure change or the current draw change is above 5 psi or P6--7 Valve Test above 1. 5A, respectively. Electronic Pass/Fail Criteria: The test records the suction pressure during the open valve position and passes if the suction pressure increase is above 3 psi when the P6--10 Expansion Valve Test valve opens for 10 seconds. NOTE P7--0 & P8 are included with "Auto2 & Auto 3" only. P9--0 through P10 are included with "Auto2" only. P6--0 NOTE This test is skipped if the sensed ambient temperature is less than 7C (45F), the return air temperature is less than --17. 8C (0F), the water pressure switch is open or the condenser fan switch is open. Setup: With the unit running, the condenser fan is turned off and a 900 second (15 minute) timer is started. The control temperature will be sampled at least once each minute starting at the beginning of P8--2. Pass/Fail Criteria: If the average recorded temperature is within +/-- 1. 0C (1. 8F) of set point, the test passes. If the average temperature is outside of the tolerance range or if the DataCORDER supply temperature probe is invalid, the test fails and and the control probe temperature will be recorded as --50. 0C. P8--2 will auto--repeat by starting P8--0 over. Setup: The defrost temperature sensor (DTS) reading will be displayed on the left display. The right display will show the supply air temperature. The unit will run FULL COOL for 30 minutes maximum until the DTT is considered closed. Once the DTT is considered closed, the unit simulates defrost by running the heaters for up to two hours, or until the DTT is considered open. Pass/Fail Criteria: The test fails if: the DTT is not considered closed after the 30 minutes of full cooling, HTT opens when DTT is considered closed or if return air temperature rises above 49C (120F). Setup: If the container temperature is below 7. 2C (45F), the set point is changed to 7. 2C and a 180--minute timer is started. The control will then be placed in the equivalent of normal heating. [. . . ] CB1 is connected to the power system, see wiring schematic. Ensure that the unit power is off AND that the unit power plug is disconnected. Open control box, see Figure 6--25 and remove low voltage shield. If using factory provisioned wiring, remove the circuit breaker panel, with circuit breaker, from the control box. [. . . ]