Carrier 48EZ(N)-A Instruction Manual download pdf (Page 14)

Table 5 can be used as a troubleshooting tool for determin-

ing which outputs will be active for a particular configuration

and each operating mode.

Table 5 — Equipment Outputs

LEGEND

Error Codes — If control cannot properly read space tem-

perature, display will indicate “--” and all outputs (except fan,

if on) will turn off. In the case where the installer has selected

to average the local sensor and the remote sensor, the control

display will alternate between “--” for the failed sensor and the

temperature sensed by the working sensor every 10 seconds.

The control will operate from the temperature sensed by the

working sensor.

CODE E1 — If the display module and the equipment control

module cannot communicate via two-wire connection, E1 will

be displayed.

CODE E2 — Not used.

CODE E3 — If control cannot properly read outdoor tempera-

ture, and it is needed for proper operation, the display will indi-

cate “--” in the outdoor temperature location.

CODE E4 — If internal memory fails, E4 will be displayed.

Replace the thermostat.

CODE E5 — If the thermostat cannot properly read humidity,

E5 will be displayed. Replace the thermostat. If both Humidifi-

cation and Dehumidification have been set to OF, the humidity

value will be shown as “–” when viewed from the humidity

menu, but no E5 will be shown in the display.

WIRING DIAGRAMS

System wiring diagrams are provided for typical Carrier

equipment. See Fig. 15-36.

EQUIP

CONFIG

(Option

Setting)

COOL

STAGE

COOL

STAGE

HEAT

STAGE

HEAT

STAGE

HEAT

STAGE

HEAT

STAGE

AC Y1

Y/Y2

W/W1

O/W2/B

— O/W2

RVS = O

Y1,

O/W2/B

Y1,

Y/Y2,

O/W2/B

Y1,

Y/Y2

Y1,

Y/Y2,

W/W1

RVS = B

Y1,

Y/Y2

Y1,

O/W2/B

Y1,

Y/Y2,

O/W2/B

Y1,

Y/Y2,

O/W2/B

W/W1

RVS = O

Y1,

O/W2/B

Y1,

Y/Y2,

O/W2/B

Y1,

Y/Y2

W/W1 W/W1

RVS = B

Y1,

Y/Y2

Y1,

O/W2/B

Y1,

Y/Y2,

O/W2/B

W/W1 W/W1

(WSHP)

Y1,

O/W2/B

Y1,

Y/Y2,

O/W2/B

Y1,

Y/Y2

Y1,

Y/Y2,

W/W1

RVS — Reversing Valve

O/W2/B

OAT

RRS

SRTN

HUM

V+

COMMERCIAL THERMOSTAT

UNIT CTB

THERMOSTAT

Humidi-MiZer® FIOP

LTLO

PNK

†

THERMOSTAT

REHEAT

CONTROL

J1-1

*Connection not required.

†Used with model 33CS2PPRH-03 thermostats only.

a33-9292

Fig. 15 — Thermostat Wiring — 48/50HC, 48/50TC, and 48/50LC04-06 Rooftop Units

LEGEND

CTB — Central Terminal Board

FIOP — Factory-Installed Option

LTLO — Low Temperature Lockout

1 2 ... 9 10 11 12 13 14 15 16 17 18 19 ... 27 28

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Carrier 48EZ(N)-A Instruction Manual Page 14

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