Carrier 50EZ-A30 - Control Voltage Connections; Standard Connections; Transformer Protection; Accessory Electric Heaters Installation

10
Control Voltage Connections
NOTE: Do not use any type of power--stealing thermostat. Unit
control problems may result.
Use no. 18 American Wire Gage (AWG) color--coded, insulated
(35C minimum) wires to make the control voltage connections
between the thermostat and the unit. If the thermostat is located
more than 100 ft (30.5 m) from the unit (as measured along the
control voltage wires), use no. 16 AWG color--coded, insulated
(35 C minimum) wires.
Standard Connections
Locate the nine low voltage thermostat leads in 24 volt splice box.
See Fig. 9 for connection diagram. Run the low-- voltage leads from
the thermostat, through the control wiring inlet hole grommet (Fig.
2 and 3), and into the low--voltage splice box. Provide a drip loop
before running wires through panel. Secure and strain relief all
wires so that they do not interfere with operation of unit. A gray
wire is standard on 3-- phase units for connection to an economizer.
If an accessory electric heater is installed, low voltage leads from
heater must be connected to factory supplied control leads from
Indoor Fan Board P4 connector.
NOTE: If the unit 24V wires do not have a matching receptacle,
cut the 24V wires from the electric heater plug, strip the ends, and
wire nut together to match the schematic connections. If the electric
heater 24V wires do not have a matching plug, cut the 24V wires
from the unit receptacle, strip the ends, and wire nut together to
match the schematic connections.
Factory wires are provided for electric heat staging W1 and W2
(W2 and W3 on IFB). If room thermostat has only one stage of
supplemental heat, connect white and violet wires shown in Fig. 9
to second stage heat field wire.
Some electric heaters have four control wires (plus common wire).
Consult unit wiring diagram and electric heater wiring diagram for
additional details.
Transformer Protection
The transformer is of the energy--limiting type. It is set to withstand
a 30--second overload or shorted secondary condition. If an
overload or short is present, correct overload condition and check
for blower fuse on Interface Fan Board. Replace fuse as required
with correct size and rating.
Accessory Electric Heaters Installation
Electric heaters may be installed with the 50EZ--A units per
instructions supplied with electric heater package. See unit rating
plate for factory--approved electric heater kits.
TRAP
OUTLET
1-in. (25 mm) min.
2-in. (51 mm) min.
A09052
Fig. 10 -- Condensate Trap
50EZ--A