Carrier 69NT40-521 manual Units equipped with the integrated DataCORDER, After Starting Inspection

4.2 STARTING AND STOPPING INSTRUCTIONS

CAUTION

Make sure that the unit circuit breaker(s) (CB-1 & CB-2) and the start-stop switch (ST) are in the OFF position before connecting to any electrical power source.

a. Starting the Unit

NOTE

The evaporator fans will always start in high speed regardless of set point and will switch to low speed after approximately 20 to 30 seconds if the set point is below -10_C (+14_F), or -5_C (+23_F) optionally.

1.Refer to Pre-Trip Inspection, section 4.1.

2.Check power source for proper voltage. Connect unit power plug and turn main power ON.

3.Turn refrigeration unit circuit breaker(s), and the start-stop switch to ON (position “1”).

4.Units equipped with the integrated DataCORDER:

Trip start is initiated by depressing the ALT. MODE key and selecting Code dc30, then depressing the ENTER key for five seconds.

5.Refer to section 4.3 after unit is running.

b. Stopping the Unit

Turn the start-stop switch to position “0” (OFF position).

4.3 AFTER STARTING INSPECTION

a.Check rotation of condenser and evaporator fans.

b.Check compressor oil level. (Refer to section 6.10.)

c.Run unit at least five minutes to stabilize. Start controller Pre-Trip diagnostics.

(Refer to section 3.2.)

4.4 UNIT OPERATION

4.4.1Crankcase Heater

When the crankcase heater is installed, it will be operational whenever the compressor is off and there is power to the unit. The heater is connected to a set of normally closed auxiliary contacts on the compressor contactor (CH).

4.4.2Probe Check Initiation

Whenever the unit is in normal control mode, that is, not in pre-trip, defrost or shutdown modes and there are NO active probe alarms, and alarm codes AL11 and AL12 are inactive (for units so equipped), the following probe diagnostic functions are performed by the controller.

The following is based on current ML2i operational software logic, version 5103. Older versions of software will have differences.

a. Probe Diagnostic Logic

If the unit is configured for standard (Std) “Probe Check Logic,” the criteria used for comparison between the primary and secondary control probes is:

S1_C (1.8_F) for perishable set points, above -10_C (+14_F), or -5_C (+23_F) optionally.

S2_C (3.6_F) for frozen set points, below above range.

SIf 25 or more of 30 readings taken within a 30 minute period are out-of-range per the above criteria, then a defrost* is initiated and a probe check is performed.

b.Special

If the unit is configured for special (SPEC) “Probe Check Logic,” the above criteria is identical except for the diagnostic readings which are:

SIf 25 or more of 30 readings taken within a 30 minute period OR any 10 consecutive readings at any time are out-of-range per the above criteria, then a defrost* is initiated and a probe check is performed.

*The only time defrost will not be initiated is if the defrost termination sensor (DTS) is greater than 25.56_C (78_F).

The 30 minute timer will be reset for each of the following conditions:

SAt every power up.

SAt the end of every defrost.

SAfter every diagnostic check that does not fall outside of the limits as described under “standard or special” as outlined above.

T-268-07 4-2