Carrier GEMINI SELECT 38APS025-065 Product Data page 96

Typical control wiring schematics (cont)
CONSTANT VOLUME APPLICATION WIRING DIAGRAM 2-STAGE THERMOSTAT CONTROL, SIZES 025-030 —
1 2
ALM
R
LEGEND
ALM R — Alarm Relay (24-v), 5-va Maximum
COOL1 — Thermostat Stage 1 (24-v)
COOL2 — Thermostat Stage 2 (24-v)
FS1 — Fan Status Switch (24-v)
LLSV — Liquid Line Solenoid Valve
LVT — Low Voltage Terminal
Field Control Wiring
*Not required for single circuit units.
NOTES:
1. Factory wiring is in accordance with UL 1995 standards. Field modifications or
additions must be in compliance with all applicable codes.
2. All units or modules have single point primary power connection. Main power
must be supplied from a field or factory-supplied disconnect.
3. Wiring for main field supply must be rated 75 C. Use copper conductors only.
a. Incoming wire size range for terminal block with MCA (minimum circuit
amps) up to 175 amps is 14 AWG (American Wire Gage) to 2/0.
b. Incoming wire size range for terminal block with MCA from 175.1 amps to
420 amps is 2 AWG to 600 kcmil.
CONSTANT VOLUME APPLICATION WIRING DIAGRAM 2-STAGE THERMOSTAT CONTROL — SIZES 025-030
WITH DIGITAL SCROLL OPTION; SIZES 040-130 WITH OR WITHOUT DIGITAL SCROLL OPTION
1 2
ALM
R
LEGEND
ALM R — Alarm Relay (24-v), 5-va Maximum
COOL1 — Thermostat Stage 1 (24-v)
FS1 — Fan Status Switch (24-v)
LLSV — Liquid Line Solenoid Valve
LVT — Low Voltage Terminal
MAT — Mixed Air Temperature Sensor
RAT — Return Air Temperature Sensor
SAT — Supply Air Temperature Sensor
Field Control Wiring
*See MAT/RAT and SAT Sensor Layout figure on page 95.
†Not required for single circuit units.
NOTES:
1. Factory wiring is in accordance with UL 1995 standards. Field modifications or
additions must be in compliance with all applicable codes.
2. All units or modules have single point primary power connection. Main power
must be supplied from a field or factory-supplied disconnect.
3. Wiring for main field supply must be rated 75 C. Use copper conductors only.
a. Incoming wire size range for terminal block with MCA (minimum circuit
amps) up to 175 amps is 14 AWG (American Wire Gage) to 2/0.
96
WITHOUT DIGITAL SCROLL OPTION
3 4 5 6 7 8 9 10 11
a38-7125
3 4 5 6 7 8 9 10
12 13 14 15 16 17 18 19 20
REMOTE
ON/OFF
COOL 2
COOL 1
c. Incoming wire size range for non-fused disconnect with MCA up to
100 amps is 14 AWG to 1/0.
d. Incoming wire size range for non-fused disconnect with MCA from
100.1 amps to 200 amps is 6 AWG to 350 kcmil.
e. Incoming wire size range for non-fused disconnect with MCA from
200.1 amps to 450 amps is 3/0 to 500 kcmil.
4. Terminals 1 and 2 of the LVT are for the alarm relay. The maximum load allowed
for the alarm relay is 5 va sealed and 10 va inrush at 24 v. Field power supply is
not required.
5. Refer to certified dimensional drawings for exact locations of the main power
and control power entrance locations.
6. Terminals 24, 25, and 2 of the LVT are for control of the field-supplied LLSV.
The maximum load allowed for each LLSV is 15 va sealed and 30 va inrush at
24 v. Field power supply is not required.
7. All discrete inputs are 24 vac.
8. LLSV (24-v) should be 15-va maximum per valve as required.
9. Installation of fan status switch (FS1) is recommended.
10. The contacts for remote ON/OFF, fan status, and demand limit options must be
rated for dry circuit application capable of handling a 24-vac load up to 50 mA.
11 12 13 14 15 16 17 18
REMOTE
ON/OFF
COOL2
COOL 1
SAT *
b. Incoming wire size range for terminal block with MCA from 175.1 amps to
420 amps is 2 AWG to 600 kcmil.
c. Incoming wire size range for non-fused disconnect with MCA up to
100 amps is 14 AWG to 1/0.
d. Incoming wire size range for non-fused disconnect with MCA from
100.1 amps to 200 amps is 6 AWG to 350 kcmil.
e. Incoming wire size range for non-fused disconnect with MCA from
200.1 amps to 450 amps is 3/0 to 500 kcmil.
4. Terminals 1 and 2 of the LVT are for the alarm relay. The maximum load allowed
for the alarm relay is 5 va sealed and 10 va inrush at 24 v. Field power supply is
not required.
5. Refer to certified dimensional drawings for exact locations of the main power
and control power entrance locations.
6. Terminals 24, 25, and 2 of the LVT are for control of the field-supplied LLSV.
The maximum load allowed for each LLSV is 15 va sealed and 30 va inrush at
24 v. Field power supply is not required.
7. All discrete inputs are 24 vac.
8. LLSV (24-v) should be 15-va maximum per valve as required.
9. Installation of fan status switch (FS1) is recommended.
10. The contacts for remote ON/OFF, fan status, and demand limit options must be
rated for dry circuit application capable of handling a 24-vac load up to 50 mA.
LVT
TERMINAL
21 22 23 24 25
STRIP
LVT
TERMINAL
19 20 21 22 23 24 25
STRIP
a38-7201