GVZC20 Service Manual

SERVICING

CTK04 ADDENDUM

DEHUMIDIFICATION SELECT*

When Dehumidication mode exists, the circulating fan out-

put is reduced, increasing system run time, over cooling the

evaporator coil and ultimately removing more humidity from

the structure than if only in cooling mode. The system can

have Dehumidication operation in setting “STD”, “A”, “B” or

“C” of “Dehumidication Select” based on dehumidication

demand. Setting “STD” allows for the widest compressor

operation range with lower CFM than Cooling mode.

In the Enhanced Dehumidication (setting A, B and C)

the indoor airow is lower than Standard Dehumidication

(STD). Setting “A” allows for the same compressor oper-

ation range in Dehumidication operation with lower CFM

than standard dehumidication (STD). Setting “B” limits

compressor operation range and keeps high dehumidica-

tion capacity. In setting “C” the system runs xed at 100%

compressor and airow. See Figure 1.

NOTE: In high humidity environments, sweating on supply

ducts, cased coils or air handler cabinets can become an

issue in Enhanced Dehumidication operation. It is strongly

recommended covering then with 2” berglass insulation for

these installations.

* The specication of *VZC200241AF, 0361AE, 0481AE

and 0601AE or earlier models are di󰀨erent from this

specication.

For details, see the Installation Manual or Service Manual

that matches the Major and Minor revision of model name.

CFM

Min

Compressor speed

Max

CFM control