40MUAA: Installation Instructions
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
23
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, (ON: 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, ON does not stop the fan, the
default is OFF
• SW1-3: Select Cooling Only and heat pump functions; ON: 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; ON:
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 as
the upper limit temperature of electric heating), and ON 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; ON = 30 minutes.
•SW3-2: This dialing code can set Y/Y2 signal setting temperature
adjustment deviation, ON: 2°F (1°C); OFF: 4°F (2°C)
•SW3-3: This dialing code can set W2 signal setting temperature
adjustment deviation, ON: 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
(CFM)
010 - Air
Volume
(CFM)
011 - Air
Volume
(CFM)
18K
660 630 600 570
10KW 10KW, 8KW 8KW 5KW, 3KW
24K
880 850 830 800
15KW 15KW, 8KW 10KW, 8KW 5KW, 3KW
30K
1100 1040 990 930
15KW 15KW, 10KW 10KW, 8KW 8KW, 5KW
36K
1320 1255 1190 1125
20KW 15KW 10KW, 8KW 8KW, 5KW
48K
1760 1675 1580 1490
20KW 15KW, 10KW 10KW, 8KW 8KW
60K
2195 2055 1920 1775
25KW 20KW, 15KW 15KW, 10KW 10KW
S4-2 Default ON:
Dehumidification
control not available.
OFF: Dehumidification
feature is enabled through
thermostat.
S4-1 Default ON:
For single stage
supplemental heat, W1 and
W2 are connected.
OFF: For dual stage supple
-
mental heat, W1 and W2 are
controlled independently.
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