Identify Factory Options; Matching 38Au Model To Evaporator Coil; General - Carrier Gemini 38AU 07 Series Installation, Start-Up And Service Instructions Manual

Identify Factory Options

Factory options will affect 38AU unit pipe sizing selections.
Coil type impacts liquid lift limits; Hot Gas Bypass impacts the se-
lection of suction tube size in vertical riser segments. Check this
unit's Model Number against the Model Number Nomenclature,
Fig. 1. Determine the significance of this unit's values in Position
11 (Coil type) and Position 6 (Hot Gas Bypass, 38AUDC12 only).
For date of unit manufacture see Serial Number Nomenclature,
see Fig. 2.

Matching 38AU Model to Evaporator Coil

The Model 38AUZ is a single-circuit unit design, requiring one set
of refrigeration piping. This model can be connected to an evapo-
rator coil with one circuit or with two circuits (by manifolding the
evaporator connections into a single piping system).
The Model 38AUD is a dual-circuit unit design that requires two
sets of refrigeration piping between the outdoor unit and the evap-
orator coil (or coils). This model can only be connected to an
evaporator coil that has two refrigeration circuits (or to two
Model Type
38AU = Carrier Condensing Unit
Puron ®
R--- 410A Refrigerant
Type of Coil
Z = Single Circuit, A/C Scroll Compressor
D = Dual Circuit, A/C Scroll Compressor
Refrigerant Options
A = None
B = Low Ambient
C = Hot Gas Bypass (38AUD size 12 only)
D = Single Circuit / 2-Stage (38AUZ size 07 and 08 only)
E = Single Circuit / 2-Stage with Low Ambient
(38AUZ size 07 and 08 only)
Nominal Tonnage
07 = 6 Tons
08 = 7.5 Tons
12 = 10 Tons
14 = 12.5 Tons
Not Used
A = Not Used
Not Used
0 = Not Used
POSITION NUMBER
TYPICAL
separate evaporator coils). The Model 38AUD CANNOT be
connected to a single-circuit evaporator coil. The Model 38AUD
CANNOT be field-converted to a single-circuit design. See
Table 3.
Before unpacking this new 38AU model, compare the evaporator
coil design to the 38AU model.

General

For unit dimensions see Fig. 3. For corner weights see Table 4. For
physical data see Tables 5 and 6.
1 2 3 4 5 6 7 8
3 8 A U D C 1 2 A 0 A 6 A 0 A 0 A 0
Fig. 1 — Model Number Nomenclature
1 2 3
0 5 1
POSITION
1−2
3−4
5
6−10
Fig. 2 — Serial Number Nomenclature
3
Table 3 — Evaporator Coil Connections
EVAPORATOR COIL CONNECT TO
HAS MODEL
Single Circuit 38AUZ ONLY
38AUZ
Two Circuits
38AUD
9 10 11 12 13 14 15 16 17 18
Service Options
0 = None
1 = Un-powered Convenience Outlet
2 = Powered Convenience Outlet
Not Used
A = Place Holder
Base Unit Controls
0 = Electro-Mechanical Controls
Design Rev
A = Initial Release
B = 38AUZ(D,E)08 only
Voltage
1 = 575/3/60
5 = 208/ 230/3/60
6 = 460/3/60
Coil Options (RTPF)
A = Cu/Al
B = Precoat (Cu/Al)
C = E-Coat (Cu/Al)
E = Cu/Cu
M = Cu/Al with Louvered Hail Guard
N = Precoat (Cu/Al) with Louvered Hail Guard
P = E-Coat (Cu/Al) with Louvered Hail Guard
R = Cu/Cu with Louvered Hail Guard
4 5 6 7
5 9 1 2
DESIGNATES
Week of manufacture (fiscal calander)
Year of manufacture ("19" = 2019)
Manufacturing location
S e q u e n c e n u m b r e
NOTES
—
Manifold evaporator circuits
into single piping system.
Use two separate piping
systems
Packaging
0 = Standard
1 = LTL
Electrical Options
A = None
C = Non-Fused Disconnect
8 9 10
3 4 5