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26
Internal Protections
Internal protections operate if an internal fault occurs in the unit.
Type
Description
Cold air dump
The internal fan will be off to prevent a cold air dump when the heat pump is in defrost mode.
Defrost cycle
The internal fan will be off to prevent a cold air dump when the heat pump is in defrost mode.
Anti-short cycle timer The compressor observes a 3-minute off time when cycling power to the unit or after an
outage.
Note:
If the heat pump is operating in Heat mode, a defrost cycle is activated to remove frost from an outdoor unit that may
have accumulated at low temperatures. The internal fan is switched off automatically and restarted only after the defrost
cycle is completed.
Operating Ranges
For efficient use, operate the unit within the ranges shown in this table.
Mode
Outdoor temperature
Indoor temperature
Indoor humidity
Cooling
(a)
(a) If the indoor cooling temperature is set higher than 90˚F (32˚C), the unit will not cool to its full capacity.
,
(b)
(b) If cooling is set below 23°F (-5°C), a wind baffle is required. See MS-SVN045* for wind baffle installation information.
0°F (-18°C) to 115°F (46°C)
64°F (18°C) to 90°F (32°C)
80% or less
Heating
(c)
(c) The standard temperature for heating is 45˚F (7˚C). If the outdoor temperature drops to 32˚F (0˚C) or below, the heating
capacity can be reduced depending on the temperature condition.
-4°F (-20°C) to 75°F (24°C)
81°F (27°C) or less
—
Drying
0°F (-18°C) to 115°F (46°C)
64°F (18°C) to 90°F (32°C)
—
External Static Pressure Configuration Settings
The configuration settings in the following table correspond to unit model and static pressure
value.
Note:
The factory default setting is the lowest value for each model.
Static pressure
4MUD4518A10N0A
4MUD4524A10N0A
in H2O
mm Aq
0.12
3
01C0EC-1C8424-27343B-370005
01C0EC-1C747C-274750-370005
0.20
5
01C0EC-1C5468-27343B-370005
01C0EC-1C54AF-274750-370005
0.30
7.5
01C0EC-1C54CE-27343B-370005
01C0EC-1C55E6-274750-370005
0.40
10
01C0EC-1C5924-27343B-370005
01C0EC-1C595A-274750-370005
0.50
12.5
01C0EC-1C596A-27343B-370005
01C0EC-1C5AB0-274750-370005
0.60
15
01C0EC-1C59CE-27343B-370005
01C0EC-1C5AE3-274750-370005
Static pressure
4MUD4530A10N0A
4MUD4536A10N0A
in H2O
mm Aq
0.16
4
0100EC-1A55D4-275A64-370005
0100EC-1A5902-276470-370005
0.28
7
0100EC-1A5927-275A64-370005
0100EC-1A595A-276470-370005
0.40
10
0100EC-1A594A-275A64-370005
0100EC-1A598C-276470-370005
0.50
12.5
0100EC-1A598C-275A64-370005
0100EC-1A59BE-276470-370005
0.60
15
0100EC-1A59BE-275A64-370005
0100EC-1A5AE0-276470-370005
0.70
17.5
0100EC-1A5AE0-275A64-370005
0100EC-1A5E12-276470-370005
0.80
20
0100EC-1A5E02-275A64-370005
0100EC-1A5E34-276470-370005
(continued)