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CTK04 ADDENDUM
Two Wire Outdoor, Four-Wire Indoor Wiring
Low voltage wiring consists of two wires between the indoor unit and heat pump and four wires between the indoor unit and
thermostat. The required wires are data lines 1 and 2, "R" (24 VAC hot) and "C" (24 VAC common). Never connect the power
wiring to communication terminal (1, 2, R, C).
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For *VZC*, do not install the 24 Volt Transformer that is included with the CTK04 Thermostat in the
Condensing Unit; it is not needed.
•
Do not attach any wires to the R & C Terminals on the Condensing Unit, as they are not needed for
inverter unit setup.
•
Data line terminals #1 and #2 are polarity sensitive. Only the data lines, 1 and 2, are required between the
indoor and outdoor units.
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Data line terminal #1 from outdoor unit must connect to terminal #1 on indoor unit and data line terminal
#2 from outdoor unit must connect to terminal #2 on indoor unit. Verify wires are not reversed.
•
To wire the system components, it is strongly recommended to use the same type and the same gague for
the wires prepared in the field (for best results use 18 AWG).
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It is strongly recommended that you do not connect more than two wires into a single terminal in the field
because there is a risk of the wires becoming loose.
•
Calculate the Liquid Line Set length and weigh in 0.6 ounces per foot of R410A refrigerant for any length
over 15 feet.
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Charge by Sub-cooling.
Sub-cooling should be 8°F ± 1°F. After adjusting charge, please allow at least 20 minutes for the system to
stabilize before making further charge adjustment.
ATTENTION INSTALLER - IMPORTANT NOTICE!
Please read carefully before installing this unit.
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