362247-BIM-B-0109
Johnson Controls Unitary Products 55
nothing is found, the economizer actuator may
have faulted and is failing to return the 24-volt “call”
to the Y1 “ECON” terminal even though the econo-
mizer is not providing free cooling. To test, discon-
nect the Mate-N-Locks and jumper between the
WHITE and YELLOW wires of the UCB’s Mate-N-
Lock plug. If the compressor energizes, there is a
fault in the economizer wiring or actuator.
14. The UCB can be programmed to lock out compres-
sor operation during free cooling and in low ambi-
ent conditions. These options are not enabled by
default. Local distributors can test the UCB for this
programming.
For units with factory installed economizers, the
UCB is programmed to lock out compressor opera-
tion when the LAS set point is reached.
For units without factory installed or with field
installed economizers, the UCB allows compressor
operation all the time. This programming can be
checked or changed by the local distributor.
15. If none of the above correct the error, replace the
UCB.
CHARGING THE UNIT
These units will be charged using the superheat
method. Superheat charging data is shown in Tables
37 and 38. When charging each system, superheat
data should be taken at the compressor inlet.
The DW-05 uses a TXV. Charge the unit to 12°F subcooling.
TABLE 37:DW-03 COOLING SUPERHEAT CHARGING TABLE
OUTDOOR TEMP
(°F)
SUPERHEAT AT COMPRESSOR SUCTION (°F)
AIRFLOW=1200 CFM
INDOOR WET BULB TEMPERATURE (°F)
55 57 59 61 63 65 67 69 71 73 75
65 32.2 32.6 33.0 33.4 33.8 34.2 34.6 35.4 36.3 36.7 37.1
70 23.3 24.7 26.1 27.5 28.9 30.3 31.7 32.8 33.9 34.5 35.0
75 14.3 16.8 19.2 21.6 24.0 26.4 28.8 30.2 31.6 32.3 32.9
80 5.4 8.8 12.2 15.7 19.1 22.5 25.9 27.6 29.2 30.0 30.9
85 - - 5.3 9.7 14.2 18.6 23.0 24.9 26.8 27.8 28.8
90 - - - 7.6 11.2 14.7 18.3 21.1 23.9 25.4 26.8
95 - - - 5.5 8.1 10.8 13.5 17.3 21.0 22.9 24.8
100 - - - - 6.3 8.3 10.3 14.0 17.8 19.7 21.6
105 - - - - - 5.7 7.0 10.8 14.6 16.5 18.4
110 - - - - - - - 7.6 11.4 13.3 15.2
115 - - - - - - - - 8.2 10.1 12.0
TABLE 38:DW-04 COOLING SUPERHEAT CHARGING TABLE
OUTDOOR TEMP
(°F)
SUPERHEAT AT COMPRESSOR SUCTION (°F)
AIRFLOW=1600 CFM
INDOOR WET BULB TEMPERATURE (°F)
55 57 59 61 63 65 67 69 71 73 75
65 36.9 37.0 37.1 37.2 37.3 37.4 37.5 37.7 37.8 37.9 38.0
70 31.1 31.8 32.5 33.1 33.8 34.5 35.1 35.5 35.9 36.1 36.3
75 25.4 26.6 27.8 29.1 30.3 31.5 32.8 33.4 34.0 34.3 34.6
80 19.6 21.4 23.2 25.0 26.8 28.6 30.4 31.2 32.1 32.5 32.9
85 13.8 16.2 18.6 20.9 23.3 25.6 28.0 29.1 30.2 30.7 31.2
90 6.9 9.5 12.1 14.7 17.3 19.9 22.6 25.1 27.6 28.8 30.1
95 - - 5.7 8.5 11.4 14.2 17.1 21.0 24.9 26.9 28.9
100 - - 5.0 7.1 9.3 11.4 13.5 16.6 19.6 21.2 22.7
105 - - - 5.8 7.1 8.5 9.9 12.1 14.3 15.4 16.5
110 - - - - 5.0 5.7 6.3 7.6 9.0 9.7 10.3
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