Carrier 48EZ(N)-A Instruction Manual download pdf (Page 6)

13. Attach display module body to equipment control module

by first setting the module on at top of equipment control

module and then snapping the bottom corners of display

module into place.

14. Turn on power to equipment. On power up, all display

segments will light for 5 seconds. For the next 5 seconds,

a 2-digit code will appear on the center of the large dis-

play which identifies the equipment configuration:

AC — Two-stage heat / Two-stage cool

HP — Three-stage heat / Two-stage cool

Power — The thermostat is powered by 24 vac only. The

thermostat requires the 24 vac (Rh and/or Rc and C terminals)

of the low-voltage transformer to be connected to it for proper

operation. The thermostat will not operate without these

connections. The Rh and Rc terminals are connected via the

PCB breakout jumper. For applications using a single 24-vac

transformer for power, the breakout jumper should remain

intact. For applications using two 24-vac transformers, the

breakout jumper must be broken because possible voltage

differences between the two transformers could cause irregular

operation or damage to the thermostat. See Fig. 12.

For applications using two 24-vac transformers, one in the

indoor unit and one in the outdoor unit, connect the common

wire from each to the C terminal. Connect R from the indoor

unit to the Rh terminal. Connect R from the outdoor unit to the

Rc terminal. Break the jumper on the circuit board. See Fig. 12.

The W and HUM signals are taken from the Rh power and the

G signal is taken from the Rc power.

If the control has been installed in a two-transformer appli-

cation that is later changed to a single-transformer installation,

the installer must install a field-supplied jumper between Rc

and Rh. Depending on the installation, up to 14 wires may be

required. Installation as two-piece unit is recommended. Only

two wires are required for connection between display module

and equipment control module. These two wires (V+ and Vg)

do not provide ordinary 24 vac. They carry a combination of

power and communications data that is unique to these

products.

Humidification Equipment and Connections

(33CS2PPRH-03 Model Only) —

The humidification

output connects directly to 24-vac operated humidifiers. No

other connection or interlock is required. Any of several

installer-selectable operating modes are available.

Dehumidification Equipment and Connec-

tions —

The D1 and D2 terminals are for a dry relay con-

tact. Operating the relay by itself will not cause 24 V to appear

at the terminal. To have 24 V appear at D2, D1 has to have a

wire jumper added to either Rc or Rh.

The dry contact must be configured for dehumidification in

configuration Option 19. See page 8. See Wiring Diagrams for

more information.

CONFIGURATION

To Enter and Exit Configuration Mode —

Press

and hold OCCUPIED button for approximately 10 seconds.

The display module will now be in Configuration mode. The

module will automatically exit this mode if no button is pressed

for 3 minutes. Pressing the DONE button will exit Configura-

tion mode immediately.

Configuration Mode — The option number is dis-

played in the heat set point location and the configuration set-

ting is displayed in the cool set point location. A box will sur-

round the option number. The MODE button is used to move

the box between the two displayed values or the soft keys be-

low the values may also be used. The value inside the box is

changed by using the UP and DOWN buttons. All changes

made are saved at the time of selection and will be saved in the

event of the 3-minute timeout or when installer exits from con-

figuration menu. See Table 1.

Table 1 — Configuration Options

LEGEND

* These settings are accessible by the user from the display without

entering Configuration mode.

WARNING

DO NOT connect unit HUM terminal directly to thermo-

stat control HUM terminal. This will bypass unit safety

controls. Personal injury or death could result.

a33-9172

Fig. 12 — PCB Breakout Jumper

OPTION NO. CONFIGURATION

01 Equipment Type

02 Replace Filter Reminder

03* Fahrenheit/Centigrade Selection

04 Fan (G) on with W/W1 Selection

05 Space Temperature Sensing

06 Cooling Lockout

07 Equipment DDC Controller

08 Auxiliary Heat Lockout Temperature Setting

09 Heat Pump Lockout Temperature

10 Reversing Valve

11 Adjustable Set Point Deadband

12 Smart Recovery

13 Space Temperature Offset Adjustment

14 Humidity Offset Adjustment

15 Enable Auto Mode

16 Cycles Per Hour

17 Time Between Stages

18* Backlight Configuration

19 Dry Contact

20 Outdoor Air Temperature Offset Adjustment

21* Keypad Lockout

22 High Cool Latch Temperature

23 High Heat Latch Temperature

24* Programmable/Non-Programmable

25* Number of Programmable Periods per Day

26 Minimum Cooling Set Point

27 Maximum Heating Set Point

28 UV Light Reminder

29 Service Reminder

30 Unused

31* Daylight Savings Time Configuration

32 Unused

33 Single or Two-Piece Installation

34 OAT/SRTN Terminals for OAT or SAT Sensor

35 Emergency Heat Mode Availability

36 Fan Selection During Occupied Periods

37 Fan Selection During Unoccupied Periods

38 Maximum Temporary Hold For Hours

39 Temperature Display

99 Reset to Factory Defaults

DDC — Direct Digital Controller

SAT — Supply-Air Temperature

OAT — Outdoor-Air Temperature

UV — Ultraviolet

1 2 3 4 5 6 7 8 9 10 11 ... 27 28

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Carrier 48EZ(N)-A Instruction Manual Page 6

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