Carrier 38APS025 - C.TYP=8 (Dual Tstat) Wiring

106
REMOTE ON/OFF
DEMAND
LIMIT
SIGNAL
4-20 mA
SIGNAL
GENERATOR
T2-Y2
T2-Y1
38AP LVT
TERMINAL STRIP
–
+
FS1
25
24
18
17
16
15
14
13
12
8
7
6
5
4
3
2
1
ALM
R
FS2
T1-Y2
T1-Y1
T1-
Y1
T1-
Y2
T2-
Y1
T2-
Y2
R
Y1
Y2
W1
W2
G
C
X
AHU2 (CIRCUIT B)
THERMOSTAT
(REQUIRED)
R
Y1
Y2
W1
W2
G
C
X
AHU1 (CIRCUIT A)
THERMOSTAT
(REQUIRED)
FIELD-SUPPLIED
TRANSFORMER
(REQUIRED)
24 VAC
SECONDARY
(REQUIRED)
(REQUIRED)
(REQUIRED)
(REQUIRED)
CXB-J6
(38APD070-130 ONLY)
FIELD-SUPPLIED
TRANSFORMER
(REQUIRED)
RED
7
6
5
PNK
ORN
LLSV-A2
LLSV-B2
24 VAC
SECONDARY
LLSV-B
LLSV-A
Fig. 140 — C.TYP=8 (Dual Tstat) Wiring
LEGEND
NOTES:
1. AHU1 is connected to 38APD — Circuit A.
AHU2 is connected to 38APD — Circuit B.
2. Field wiring must be in accordance with local codes.
3. LVT-1 and 2 are for the alarm relay. The maximum load allowed for the alarm relay
is 5 VA sealed, 10 VA at 24 VAC. Field power supply is not required.
4. LVT-24, 25, and 2 are for control of field-supplied liquid line solenoid valve (LLSV)
15 VA sealed, 30 VA inrush at 24 VAC. Field power supply is not required.
5. For 38APD070-130 units, an additional LLSV, 15 VA sealed, 30 VA inrush at 24
VAC can be connected to CXB. A field-supplied control transformer is required, not
to exceed 75 VA.
6. All discrete inputs are 24 VAC.
7. Installation of fan status switches (FS1, FS2) is recommended. If not used, a
jumper must be installed.
8. Energy management module (EMM) is required.
9. This control scheme does not support digital compressor operation.
10. The contacts for Remote On-Off, Fan Status Switch and Demand Limit must be
rated for dry circuit applications capable of handling a 24 VAC load up to 50 mA.
11. Single or 2-Step Demand Limit is not available with this control type.
AHU — Air-Handling Unit
ALM R — Alarm Relay
CXB — Compressor Expansion Board
FS1 — Fan Status Switch, AHU1
FS2 — Fan Status Switch, AHU2
LLSV-A — Liquid Line Solenoid, Circuit A, First Stage
LLSV-A2 — Liquid Line Solenoid, Circuit A, Second Stage (38APD070-130 only)
LLSV-B — Liquid Line Solenoid, Circuit B, First Stage
LLSV-B2 — Liquid Line Solenoid, Circuit B, Second Stage (38APD070-130 only)
LVT — Low Voltage Terminal
T1 — AHU1 Thermostat
T2 — AHU2 Thermostat
——— Factory Wiring
--------- Field Wiring