Service manual

T -318
4-- 3
NOTE
If controller configuration variable CNF48 is ac-
tivated the condenser fan motor will activate if
the HPS opens twice in less than seven minu-
tes. Power cycling the unit resets the counter.
c. To shift to air-cooled condenser operation, discon-
nect the water supply and the discharge line to the
water-cooled condenser. The refrigeration unit will
shift to air-cooled condenser operation when the wa-
ter pressure switch closes or if the controller configu-
ration variable CNF48 is activated, the condenser fan
motor will activate if the HPS opens twice in less than
seven minutes. Power cycling the unit resets the
count.
4.4.2 Water -Cooled Condenser with Condenser
Fan Switch
a. Connect the water supply line to the inlet side of con-
denser and the discharge line to the outlet side of the
condenser (see Figure 2-5).
b.Maintainaflowrateof11to26lpm(3to7gpm).
c. Set the condenser fan switch to position “O.” This will
de-energize the condenser fan relay. The condenser
fan motor will stop until the CFS switch is set to posi-
tion “I.”
NOTE
If controller configuration variable CNF48 is ac-
tivated, the condenser fan motor will activate if
temperature at the compressor discharge tem-
perature sensor (CPDS) exceeds 115.5 C
(240 F). The fan will cycle off when the tempera-
ture drops to 90.5 C (150 F). If the CPDS sen-
sor is faulty, the logic will not operate.
CAUTION
When condenser water flow is below 11 lpm
(3 gpm) or when water -cooler is not in use,
the CFS switch MUST be set to position “I”
or the unit will not operate properly.
d. To shift to air-cooled condenser operation, stop the
unit, set the CFS switch to position “I,” and restart the
unit. Disconnect the water lines to the water-cooled
condenser.
4.5 CONNECT REMOTE MONITORING
RECEPTACLE
If remote monitoring is required, connect remote
monitor plug at unit receptacle (see item 9, Figure 2-6).
When the remote monitor plug is connected to the
remote monitoring receptacle, the following remote
circuits are energized:
CIRCUIT
FUNCTION
Sockets B to A Energizes remote cool light
Sockets C to A Energizes remote defrost light
Sockets D to A Energizes remote in-range light
4.6 STARTING AND STOPPING INSTRUCTIONS
WARNING
Make sure that the unit circuit breaker(s)
(CB-1 & CB-2) and the START- STOP switch
(ST) are in the “O” (OFF) position before
connecting to any electrical power source.
4.6.1 Starting the Unit
1. With power properly applied, the fresh air damper set,
and if required, the water-cooled condenser con-
nected (refer to paragraphs 4.2, 4.3, & 4.4), place the
START-STOP switch to “I” (ON).
2. Continue with Start Up Inspection (refer to paragraph
4.7).
4.6.2 Stopping the Unit
To stop the unit, place the START-STOP switch in
position “O” (OFF).
4.7 START-UP INSPECTION
4.7.1 Physical Inspection
a. Check rotation of condenser and evaporator fans.
b. Check compressor oil level (refer to paragraph 6.8.6).
4.7.2 Check Controller Function Codes
Check and, if required, reset controller Function Codes
(Cd27 through Cd39) in accordance with desired
operating parameters (refer to paragraph 3.2.2).
4.7.3 Start Temperature Recorder
a. Open recorder door and wind mechanical clock or
check battery of electronic recorder. Be sure key is re-
turned to storage clip of mechanical recorder.
b. Lift stylus (pen) by pulling the marking tip outward un-
til the stylus arm snaps into its retracted position.
c. Install new chart making sure chart is under the four
corner tabs. Lower the stylus until it has made contact
with the chart. Close and secure door.
DataCORDER
a. Check, and if required, set the DataCORDER Config-
uration in accordance with desired recording parame-
ter (refer to paragraph 3.6.3).
b. Enter a “Trip Start.” To enter a “Trip Start,” do the fol-
lowing:
1. Depress the ALT MODE key and scroll to Code
dC30.
2. Depress and hold the ENTER key for five seconds.
3. The “Trip Start” event will be entered in the Data-
CORDER.
4.7.4 Complete Inspection
Allow unit to run for five minutes to stabilize conditions
and perform a pre-trip diagnosis in accordance with the
following paragraph.