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English
L-2091 Operation
BTU Guide - Refrigeration Loss/Gain
Specs
BTU loss per hour for various capacity boxes at 100°F
difference between inside and outside temperature.
Digital Thermostat Display Error Messages
E1- Appears when either the up or down key is pressed
when not in the programming mode.
To correct: If the E1 message appears even when
no keys are being pressed, replace the control.
E2- Appears if the control settings are not properly stored
in memory.
To correct: Check all settings and correct if neces-
sary.
EP- Appears when the probe is open, shorted or sensing
a temperature that is out of range.
To correct: Check to see if the sensed temperature
is out of range. If not, check for probe damage by
comparing it to a known ambient temperature be-
tween -30°F and 220°F. Replace the probe if neces-
sary.
EE- Appears if the EEPROM data has been corrupted.
To correct: This condition cannot be fi eld repaired.
Replace the control.
CL- Appears if calibration mode has been entered.
To correct: Remove power to the control for at least
fi ve seconds. Reapply power. If the CL message still
appears, replace the control.
Box Internal Insulation Thickness (R-7 Foam)
Volume (cubic ft)
1" 2"
3" 4"
1 136 89 75 69
2
201 126
102 92
3
256 156
125 110
4
308 184
145 127
5
350 207
161 140
6 388 229 177 153
7
428 250
192 165
8
464 267
206 176
9
500 289
220 187
10
532 306
232 197
11 565 323 244 206
12
596 340
256 216
13
626 356
267 225
14
655 371
278 233
15
684 387
290 242
20 902 505 374 310
25
1040 577 424 350
30
1178 649 475 389
35
1316 721 525 428
Box Internal Insulation Thickness (R-5 Foam)
Volume (cubic ft)
1" 2"
3" 4"
1 190 124 105 97
2
282 176 143 128
3 359 219 174 154
4
441 264 208 182
5 496 294 229 199
6
551 323 250 215
7 602 351 270 231
8
651 378 289 247
9 699 403 307 261
10
745 428 325 275
11 790 452 342 289
12
832 475 358 301
13 875 497 374 314
14
917 520 390 327
15 958 542 405 339
20
1147 642 476 395
25 1323 734 540 445
30
1499 826 604 495
35 1675 918 668 545
9. High condensing temperature.
High ambient temperature – introduce cooler air into
compar
tment that houses the condensing unit.
High water temperature – while y
ou cannot remedy
this prob
lem, you can help by
introducing cooler air
into the compar
tment that houses the condensing
unit.
Pump not oper
ating – fi nd cause and remedy.
Condenser fan failure – replace component.
10. Improperly mounted temperature sensor in re-
frigerated box.
Refer to Installation section for proper location of
sensor
. If drilling in a wrapped bo
x, be sure to
confi
rm placement of evaporator lines before drilling.
This can be accomplished by tur
ning the condensing
unit on, and chec
king for frost lines in the box.
11. Moisture in system.
Have a certifi ed technician check for this problem.
If there is moisture present, he/she will decide a
course of action to tak
e which should include:
leak
chec
k, installation of liquid line fi lter/dryer, evacua-
tion, and recharging. Unit should be checke
d at later
date f
or any remaining moisture.
12. Inadequate design.
Not every box is designed for every condition. It may
be that y
our box was not designed properly.
If this is
the prob
lem, replacement of the bo
x or condensing
unit ma
y be the only solution.
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