C.typ=3 (Tstat Multi) Wiring - Carrier 38APS025 Manual

AHU
THERMOSTAT
(REQUIRED)
R
Y1
Y2
W1
W2
G
C
X
LEGEND
AHU — Air-Handling Unit
ALM R — Alarm Relay
CXB — Compressor Expansion Board
FS1 — Fan Status Switch
LLSV-A — Liquid Line Solenoid, Circuit A, First Stage
LLSV-A2 — Liquid Line Solenoid, Circuit A, Second Stage
(38APS040,050, 38APD070-130 only)
LLSV-B — Liquid Line Solenoid, Circuit B, First Stage
(38APS065, 38APD only)
LLSV-B2 — Liquid Line Solenoid, Circuit B, Second Stage
(38APS065, 38APD070-130 only)
LVT — Low Voltage Terminal
MAT/RAT — Mixed Air Thermistor/Return Air Thermistor
SAT — Supply Air Thermistor
Factory Wiring
Field Wiring
NOTES:
1. Field wiring must be in accordance with local codes.
2. 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.
3. 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.
4. 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.
5. All discrete inputs are 24 VAC.
6. Installation of fan status switch (FS1) is recommended. If not used, a jumper must
be installed.
7. Energy management module (EMM) is required for Demand Limit functions, 4 to
20 mA, Demand Limit Step 1 and 2, or 4 to 20 mA Temperature Reset.
8. 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.
DEMAND
LIMIT SIGNAL
4-20 mA
–
SIGNAL
GENERATOR
+
TEMPERATURE
RESET SIGNAL
4-20 mA
–
SIGNAL
GENERATOR
+
SAT (REQUIRED)
MAT/RAT (REQUIRED)
Fig. 81 — C.TYP=3 (Tstat Multi) Wiring
68
38AP LVT
TERMINAL STRIP
1
2
DEMAND LIMIT STEP 1
3
4
DEMAND LIMIT STEP 2
5
6
7
8
9
11
12
REMOTE ON/OFF
13
14
15
FS1
16
18
19
20
24
25
(38APD070-130 ONLY)
CXB-J6
RED
PNK
5
6
ORN
7
ALM
R
LLSV-B (38APD)
LLSV-A2 (38APS)
or LLSV-B2 (065)
LLSV-A
or LLSV-B (065)
FIELD-SUPPLIED
TRANSFORMER
(REQUIRED)
24 VAC
SECONDARY
LLSV-A2
LLSV-B2