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3
GENERAL
This publication contains controls, start-up, service, opera-
tion, and troubleshooting information for the Gemini™ Select
38AP condensing units with
Comfort
Link controls. The 38AP
air-cooled condensing units are intended for commercial com-
fort-cooling applications. Multiple scroll compressors are
staged to provide capacity control. The units are shipped with a
nitrogen holding charge and utilize Puron
®
refrigerant
(R-410A) as the operating refrigerant. See Table 1 for unit size
information.
Table 1 — Unit Sizes
Conventions Used in This Manual —
The follow-
ing conventions for discussing configuration points for the
local display (scrolling marquee or Navigator™ accessory)
will be used in this manual.
Point names will be written with the mode name first, then
any sub-modes, then the point name, each separated by an
arrow symbol (
o
. Names will also be shown in bold
and italics. As an example, the Lead/Lag Circuit Select Point,
which is located in the Configuration mode, Option sub-mode,
would be written as
Configuration
o
OPT2
o
LLCS
.
This path name will show the user how to navigate through
the local display to reach the desired configuration. The user
would scroll through the modes and sub-modes using the
and
keys. The arrow symbol in the path name repre-
sents pressing
to move into the next level of the
menu structure.
When a value is included as part of the path name, it will be
shown at the end of the path name after an equals sign. If the
value represents a configuration setting, an explanation will
be shown in parenthesis after the value. As an example,
Configuration
o
OPT2
o
LLCS
= 2
(Circuit A leads).
Pressing the
and
keys simultaneously
will scroll an expanded text description of the point name or
value across the display. The expanded description is shown in
the local display tables but will not be shown with the path
names in text.
The CCN (Carrier Comfort Network
®
) point names are also
referenced in the local display tables for users configuring the
unit with CCN software instead of the local display. The CCN
tables are located in Appendix B of the manual.
CONTROLS
General —
The 38AP air-cooled condensing unit contains
the
Comfort
Link electronic control system that controls and
monitors all operations of the unit.
The control system is composed of several components as
described in this manual. See Fig. 1-4 for typical control box
component arrangements. See Fig. 5-15 for typical power and
control wiring. Table 2 lists the drawings by unit size.
CAUTION
Puron
®
refrigerant (R-410A) systems operate at higher
pressures than standard R-22 systems. Do not use R-22 ser-
vice equipment or components on Puron refrigerant equip-
ment. If service equipment is not rated for Puron
refrigerant, equipment damage or personal injury may
result.
CAUTION
Refrigerant charge must be removed slowly to prevent loss
of compressor oil that could result in compressor failure.
CAUTION
This unit uses a microprocessor-based electronic control
system. Do not use jumpers or other tools to short out com-
ponents, or to bypass or otherwise depart from recom-
mended procedures. Any short-to-ground of the control
board or accompanying wiring may destroy the electronic
modules or electrical components.
Be aware of electrostatic discharge (static electricity) when
handling or making contact with circuit boards or module
connections. Always touch a chassis (grounded) part to
dissipate body electrostatic charge before working inside
control center.
Use extreme care when handling tools near boards and
when connecting or disconnecting terminal plugs. Circuit
boards can easily be damaged. Always hold boards by the
edges and avoid touching components and connections.
This equipment uses, and can radiate, radio frequency
energy. If not installed and used in accordance with the
instruction manual, it may cause interference to radio
communications. It has been tested and found to comply
with the limits for a Class A computing device pursuant to
International Standard in North America EN61000-2/3
which are designed to provide reasonable protection
against such interference when operated in a commercial
environment. Operation of this equipment in a residential
area is likely to cause interference, in which case the user,
at his own expense, will be required to take whatever mea-
sures may be required to correct the interference.
Always store and transport replacement or defective boards
in anti-static shipping bag.
UNIT SIZE
NOMINAL
CAPACITY
TONS
(60 Hz)
NOMINAL
CAPACITY
kW
(60 Hz)
NOMINAL
CAPACITY
TONS
(50 Hz)
NOMINAL
CAPACITY
kW
(50 Hz)
38APS025
24.0
84.3
20.0
70.3
38APD025
24.0
84.3
20.0
70.3
38APS027
26.6
93.4
22.2
78.1
38APD027
26.6
93.4
22.2
78.1
38APS030
31.1
109.2
26.0
91.4
38APD030
31.1
109.2
26.0
91.4
38APS040
39.8
139.8
32.8
115.3
38APD040
39.2
137.7
32.6
114.6
38APS050
48.1
168.9
39.5
138.9
38APD050
50.0
175.6
41.6
146.3
38APD060
58.3
204.7
48.0
168.8
38APS065
59.6
209.6
49.4
173.7
38APD070
67.3
236.4
58.5
205.7
38APD080
78.0
273.9
64.5
226.8
38APD090
87.4
306.9
71.9
252.8
38APD100
96.0
337.2
79.8
280.6
38APD115
110.4
388.3
90.8
319.3
38APD130
125.1
442.3
103.7
364.6
ENTER
ESCAPE
ENTER