Carrier 48EZ(N)-A Instruction Manual download pdf (Page 7)

Configuration Options

OPTION 01 — EQUIPMENT TYPE — This option deter-

mines the control method of the thermostat. It should match the

type of equipment used. The selection is as follows:

HP — Three-stage heat/two-stage cool with reversing valve

AC — Two-stage heat/two-stage cool, no reversing valve

hh — The selection of hh should only be made if the equip-

ment is a 48EZ or 48VT model small packaged prod-

uct (SPP).

35 — Water source heat pump (WSHP), three-stage heat/

two-stage cool with reversing valve.

Default is AC.

OPTION 02 — REPLACE FILTER REMINDER — This

configuration selects the hours of fan operation (heating, cool-

ing, or fan) before CHECK FILTER icon is displayed. With OF

selected, icon will never come on, disabling this feature. Time

selection can range from 600 to 5400 hours by selecting num-

bers 1 through 9. The time is 600 hours times the number select-

ed. Default is 1 (600 hr).

OPTION 03 — FAHRENHEIT/CELSIUS SELECTION —

This configuration selects between Fahrenheit (F) and Celsius

OPTION 04 — FAN (G) ON WITH W/W1 SELECTION —

This selection determines whether fan (G) output is to be on or

off when the W/W1 energized in an AC system, the fan will turn

on when O/W2 is energized in Emergency Heat mode. Allow-

able selections are On and OF (off). Default is On.

OPTION 05 — SPACE TEMPERATURE SENSING — This

selection determines which sensor the control will use for mea-

suring space temperature. Space temperature can be sensed in

one of three ways: the local sensor (L) located on the display

module, the remote sensor (r), or the average of local and remote

sensors (Lr). The Carrier sensor 33ZCT55SPT would be used

for remote space sensing and averaging. Settings are L, r, or Lr.

The default is L (local).

NOTE: When this value is changed, the space temperature off-

set, Option 13, is reset to zero.

OPTION 06 — COOLING LOCKOUT — This selection

disables cooling when outdoor temperature is below the speci-

fied temperature. Temperature can be set from 20 to 60 F (–6.70

to 15.5 C) in increments of 5° F (2.8° C). Setting is not available

if valid outdoor sensor is not connected. Set to OF (off) to allow

cooling below at all times. Allowable settings are OF (off) and

20 through 60. Factory default is OF (off).

OPTION 07 — EQUIPMENT DDC CONTROLLER — This

selection should be set to On when control is to be used with

DDC (direct digital control) equipment. These control systems

will take care of the time guard and cycle timers. Examples

include zone controlling units or two-position valve assemblies

that can open or close as required, without regard to exceeding a

maximum number of operations per hour. Rooftop units used

with PremierLink™ or ComfortLink controls do not require

thermostat control to handle timers and safeties, so this selection

would also be set to On in this case.

Set this selection to OF (off) if the thermostat is directly con-

nected to equipment such as a furnace or fan coil unit with DX

condensing units, or electro-mechanical rooftop units that have a

maximum number of cycles per hour rating, but do not imple-

ment that requirement themselves and rely instead on the ther-

mostat.

Allowable settings are On and OF (off). The default is OF

(off).

OPTION 08 — AUXILIARY HEAT LOCKOUT TEMPER-

ATURE SETTING — This selection is available on heat pump

systems with a valid outdoor temperature sensor connected.

Available settings are: Off, 5, 10, 15, 20, 25, 30, 35, 40, 45, 50 or

55 F (–15, –12.2, –9.4, –6.7, –3.9, –1.1, 1.7, 4.4, 7.2, 10 or

12.8 C).

When set to OF (off), the function is disabled. Auxiliary heat

is allowed to operate whenever sufficient demand for heat is

available.

When set to 5 through 55 F (–15 through 12.8 C), this is the

outdoor temperature above which the auxiliary heat is not al-

lowed to operate.

The default is OF (off).

OPTION 09 — HEAT PUMP LOCKOUT TEMPERA-

TURE — This function is only available on hybrid heat systems

that have a valid outdoor temperature sensor connected. Config-

uration options are Off, 5, 10, 15, 20, 25, 30, 35, 40, 45, 50 or

55 F (–15, –12.2, –9.4, –6.7, –3.9, –1.1, 1.7, 4.4, 7.2, 10 or

12.8 C). When set to Off, the heating equipment cycle will

always start with the heat pump regardless of the outdoor-air

temperature. When set to 5 through 55 F (–15 through 12.8 C),

and the outdoor-air temperature is less than the selected tempera-

ture, the heating cycle is started with the auxiliary heat. If the

outdoor-air temperature is equal to or greater than the selected

temperature, the heating cycle is started with the heat pump.

NOTE: The heat pump lockout temperature must be set to a

value less than the auxiliary heat lockout temperature (Option 8)

unless the auxiliary heat lockout temperature setting is Off. If

the outdoor air sensor is invalid, all heating cycles will start with

the heat pump.

Default is Off.

OPTION 10 — REVERSING VALVE — This selection is only

available on hh (hybrid heat) and HP (heat pump) systems.

The "C" configuration is used to describe a heat pump system

that energizes its reversing valve (O/W2/B) in cooling.

The "H" configuration is used to describe a heat pump system

that energizes its reversing valve (O/W2/B) in heating.

NOTE: The WSHP will always energize the reversing valve in

cooling.

The default is C.

OPTION 11 — ADJUSTABLE SET POINT DEAD-

BAND — The selection allows the installer to choose how

much differential will exist between the heating and cooling set

points. Allowable selections are 1 to 10 F (0.55 to 5.55 C). The

default is 5 F (2.8 C).

OPTION 12 — SMART RECOVERY — Smart Recovery

OF (off) means set points change precisely at the programmed

time. A value of 30, 60, or 90 selects the number of minutes re-

covery starts before programmed recovery time. Recovery takes

place smoothly during the selected recovery time, ending at the

recovery time and temperature which is programmed. This is not

available when thermostat is configured as non-programmable.

Allowable selections are OF (off), 30, 60, and 90. The default is

90.

OPTION 13 — SPACE TEMPERATURE OFFSET

ADJUSTMENT — This configuration is the number of degrees

to be added to the displayed temperature to calibrate or deliber-

ately miscalibrate the measured space temperature. The range is

from –5 to +5 F (–2.8 to +2.8 C). The default is 0.

NOTE: This value is reset to zero when the space temperature

sensing option 05 is changed.

OPTION 14 — HUMIDITY OFFSET ADJUSTMENT —

This configuration is the percentage to be added to the displayed

humidity to calibrate or deliberately miscalibrate the measured

humidity. The range is from –9% to +9% RH. The default is 0.

OPTION 15 — ENABLE AUTO MODE — This configura-

tion allows the user to select auto changeover mode. It allows the

thermostat to automatically change between heating mode and

cooling mode when sufficient demand for heating or cooling ex-

ists. When it is set to On, then Auto mode is available. When it is

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Carrier 48EZ(N)-A Instruction Manual Page 7

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