Installation Guide

INSTALLATION
9
LOW VOLTAGE CONTROL WIRING
1. Field installed low voltage control
wiring must be a minimum of 18AWG.
2. Low voltage provided by terminal “R” in
Indoor Unit is 24VAC.
3. Terminal “G” in Outdoor Unit is not used
and does not require any field wiring to be
connected to this terminal.
4. 4-Way Valve (Reversing Valve) is energized
by terminal “B” in the Heating Mode and
must be configured accordingly at the field
installed thermostat.
5. Break “R” or “Y” from thermostat when using a field installed Condensate Overflow Safety.
It is the licensed HVAC
installing contractors
responsibility to install the
Low Voltage Control Wiring
in accordance with any
prevailing local, state, and
federal codes and
regulations.
3.6 Optional Electric Heater………………………………………………………
Indoor Unit Model
Cooling
Capacity
Electric Heater
Model
Electric Heater
Size (kW)
FLEXX24 / 36HP230V1BH 24K / 36K FLEXXHTR5KW 5
FLEXX24 / 36HP230V1BH 24K / 36K FLEXXHTR8KW 8
FLEXX36 / 48 / 60HP230V1BH 36K / 48K / 60K FLEXXHTR10KW 10
FLEXX48 / 60HP230V1BH 48K / 60K FLEXXHTR15KW 15
FLEXX48 / 60HP230V1BH 48K / 60K FLEXXHTR20KW 20
NOTES:
1. Optional Electric Heater “Sold Separately”.
2. When Optional Electric Heater is installed, Indoor Unit power supply must be connected to
circuit breakers provided with Electric Heater. *Refer to Electric Heater Installation
Instructions for all electrical requirements*
For more information on the optional Electric Heater, power supply requirements, and step-by-
step installation instructions please visit www.greecomfort.com or use the camera on your smart
phone to scan the QR code below:
NOTE:
Y means Compressor control signal for the outdoor unit;
B which is energized under the heating mode means 4-way valve control
signal;
D means defrosting signal;
R means 24V AC power supply;
C means 24V common;
G means indoor unit fan signal for the indoor unit;
W1 means heater control signal.
NOTE:
For cooling only unit, there is no need to connect the B and D
terminals.
NOTE:
When outdoor defrosts, D of outdoor unit will send 24V signal to avoid
cold winds.
NOTE:
When the electric heating operate, the indoor unit is forced to open the
indoor unit fan.
①. High and low voltage wires should be led through different rubber rings of
the electric box cover.
②. Do not bundle up the thermostat wires or lay them side by side, otherwise errors will occur.
③. High and low voltage wires should be secured separately. Secure the former ones with big clamps and the latter ones with small clamps.
④. Use screws to tighten up the thermostat wires and power cords of unit on the terminal board. Wrong connection may lead to fire hazard.
⑤. If the thermostat wires of unit and power cords are not correctly connected, the air conditioner may get damaged.
⑥. Ground the unit through connecting the ground wire.
⑦. The units should comply with applicable local and national rules and regulations on power consumption.
⑧. When connecting the power cords, make sure the phase sequence of the power supply matches with the corresponding terminals,
otherwise the compressor will get reversed and operate abnormally.