Carrier 40MUAA Installation Instructions Manual Download

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40MUAA: Installation Instructions

Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.

SW1

This dip switch group mainly controls and selects the type of unit. It is
suggested that adjustments are only made under the guidance of the

authorized technician.

•

SW1-1:

Control function, (

: 24V Thermostat;

OFF

: Wired

controller, default)

•SW1-2:

Use this dip switch to determine whether to stop the fan when

cold air is released;

OFF

stops the fan,

does not stop the fan, the

default is

OFF

• SW1-3:

Select Cooling Only and heat pump functions;

: cooling

only;

OFF

: heating and cooling, default

•SW1-4:

Leave

OFF

Not

Applicable.

SW2

This dip switch group mainly controls the opening form of the electric
auxiliary heat.

•SW2-1:

This dial code can control the temperature difference when

the electric heating is turned on.

OFF

: 4°F(2°C), default;

2°F(1°C), 3-level temperature setting, consistent with user thermostat
setting.

NOTE: When E/AUX controls electric heating, there is no
temperature difference, and it starts directly.

•SW2-2, SW2-3:

This two-digit dialing code can control the delayed

start of electrically-assisted heat. When the temperature difference is
too great, the delayed start and the delayed start time can be selected.

•SW2-4:

This dial code controls the permissible opening temperature

of electric heating or compressor,

OFF

allows the opening temperature

of electric heating (using the set temperature of

S3 Rotary Switch

the upper limit temperature of electric heating), and

the allowable

opening temperature of the compressor (using

Rotary Dial S3

as the

upper limit temperature of electric heating). The lower limit
temperature at which the compressor can allow operation.)

S3 Rotary Switch

Ambient temperature controlled by electric heating or compressor, 0
means no temperature protection is turned on, Rotary Dial position 1
through F maps to -4°F (-20°C) through 46°F (8°C). Each rotary dial
point is a 4°F (2°C) change from the previous point.

Example:

Set dial point 1 = -20C. Dial point 2 = -18C. ....Dial point F =

8C, and each scale represents 4°F (2°C).

Fig. 53 —SW3 Settings

SW3

This dip switch group mainly controls adjustments to temperature dead-
bands.

•SW3-1:

This dialing code can set the continuous operation time for

increasing the set temperature by 1°F-5°F(0.5°C~3°C) before reaching
the temperature. The default is

OFF

= 90 minutes;

= 30 minutes.

•SW3-2:

This dialing code can set Y/Y2 signal setting temperature

adjustment deviation,

: 2°F (1°C);

OFF

: 4°F (2°C)

•SW3-3:

This dialing code can set W2 signal setting temperature

adjustment deviation,

: 4°F (2°C);

OFF

: 6°F (3°C).

•SW3-4:

Not in use

SW4 Air Flow Adjustment

This dip switch group works as a combination and enables nominal CFM
adjustments.
Only switches 1-3 are enabled. Switch 4 is reserved for future use. The
available settings are: 000/001/010/011, and the air flow is adjusted
according to Table 14:

Table 14 — Air Volume

S4 Dip Switch Settings

This dip switch group is for configuring the staging of supplemental heat
and for dehumidification fan control.

•

S4-1:

Use this dip switch when 2 stages of supplemental heat, W1 and

W2, are available; OFF allows for independent control of W1 and W2
via the Thermostat (dual stage), ON is used for single stage
supplemental heat, W1 and W2 are internally jumped together. The
default is ON

•

S4-2:

Use this dip switch to enable dehumidification fan operation.

OFF will remove the internal jumper from R to DH, meaning DH will
be controlled via the thermostat. When the system is configured for
dehumidification and there is a demand present, the 24V output from
the thermostat drops to 0V, the refrigeration system starts the
dehumidification operation, and the fan air volume drops to 80% of the
nominal refrigeration air volume. ON will create an internal jump
between R and DH, meaning no external dehumidification signal is
present, DH will always receive a 24V signal and the fan will operate
as normal. The default is ON

NOTE: S4-2 operates on reverse logic. DH is energized when there is
no external dehumidification control.

A220844

Fig. 54 —S4 DIP Switch

SW2-2

1-bit dialing, ON 5°F (2.5°C), OFF without delay
1 bit dialing, OFF 15 minutes, ON 30 minutes, 15

minutes by default, delayed opening time

Model

SW4-1, 2, 3 Setting

(Default)

Air Volume (CFM)

001 - Air

Volume