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Page 8 of 12 507296-02Cmrcool.com
The unit will remain locked out until power to the board
is interrupted, then re-established, or until the jumper
is applied to the TEST pins for 0.5 seconds.
NOTE: The defrost control board ignores input from the
low pressure switch terminals as follows:
• During the TEST mode
• During the defrost cycle
•
•
If the TEST pins are jumpered and the 5-minute delay
is being bypassed, the LO PS terminal signal is not
ignored during the 90-second start-up period.
Diagnostic LEDs
Defrost Board Diagnostic LEDs
Green LED
(DS2)
Red LED
(DS1)
Condition
OFF OFF
ON
Fault & Lockout Codes
OFF
OFF ON
OFF
ON OFF
Table 3. Defrost Control (CMC1) Diagnostic LEDs
System Performance
the suction superheat value to judge performance. When
checking performance of a unit that uses an expansion
system performance.
If the measured performance value varies from table value
refrigerant to nameplate charge. It is critical that the exact
system performance.
components.
Model
Suction
Superheat +/- 3°
Liquid
Subcooling +/- 2°
2 Ton 13
2.5 Ton
3 Ton 14
3.5 Ton 14
4 Ton
5 Ton
Table 4. Air Conditioner Unit Cooling System
Performance Values
Model
Suction
Superheat +/- 3°
Liquid Subcooling
+/- 2°
2 Ton 18
2.5 Ton
3 Ton
3.5 Ton 22
4 Ton 22
5 Ton 5
Table 5. Heat Pump Cooling System Performance
Values
Model Liquid Subcooling +/- 2°
2 Ton
25
2.5 Ton
15
3 Ton
28
3.5 Ton
4 Ton
35
5 Ton
28
Table 6. Heat Pump Heating System Performance
Values
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