Carrier 42C,V Manual de instalación Pagina 71
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71
T
hermostatic 2-Pipe Auxiliary Electric Heat with Valve
Control — This system, also called twilight or intermediate
season electric heat, goes a long way towards solving the
spring and fall control problems of 2-pipe systems.
Chilled water can be run late into the fall, turned on early in
the spring and electric heat will still be available to all units
whenever required.
In winter the system is switched over to hot water. Two
changeover devices are required for this. One device switches
the action of the thermostat and the other locks out the electric
heat when hot water is in the coil.
With this system, the fan runs continuously unless manually
switched to OFF or AUTO position. Fan must be on before
thermostat can send signal to open chilled water valve or turn
on electric heater.
Two control methods are available:
1. Use the standard automatic changeover thermostat with a
dead band between heating and cooling.
2. Use a manual changeover thermostat. With this method
only one changeover is required.
Be sure to include a 2-way or 3-way electric valve with this
system.
NOTE: Wiring diagrams are for typical applications. If other
voltages for heaters or controls are specified, wiring may differ
from that shown. See Fig. 86 for line voltage control. See
Fig. 87 and 88 for 24-v control. Refer to wiring diagram on
unit blower housing for unit specific wiring.
Fig. 86 — 42C,S,V (except VG), and 42D (600-1000 cfm) 2-Pipe Heating and Cooling with
Auxiliary Heat — Remote/Wall-Mounted Thermostat (Line Voltage) and Dual Power Source
UNIT MOUNTED
J BOX
EQUIPMENT
GROUND
L2 or N
L1
THERMOSTAT PART # 702893-36
W/RED
HI W/ORG
L1 BLK
LOW W/BRN
HEAT RED
COOL BLU
PUR
ORG
L2 OR N YEL
VALVE
REMOTE DEVICE BOX
*WHT
LIMIT SWITCH
AQUASTATS
CONTACTOR
1
L1
L2 OR N
GRN
*WHT
BLKBLKBLK
*WHT
WHT
BLK
RED
PUR
BRN
BRN
RED
*WHT
BLOWER
MOTOR
HBLK
COM
WHT
BLUM
REDL
QUICK CONNECT
OPTIONAL
RED
BLU
BLK
*WHT
ONLY 120V WHT/ALL OTHERS BLK
RISE
BLK
BLU
RED
RISE
BLK
BLU
RED
- Instructions 1
- PHYSICAL DATA 2
- PRE-INSTALLATION 4
- Unpack and Inspect Units — 4
- A42-4102 8
- A42-4105 9
- A42-4106 10
- A42-4149 11
- A42-4107 15
- A42-4108 16
- FRONT VIEW 17
- A42-4112 23
- A42-4113 24
- A42-4114 25
- A42-4115 26
- A42-4116 27
- A42-4121 29
- A42-4122 30
- A42-4123 31
- A42-4124 32
- A42-4125 33
- A42-4304 35
- A42-4128 36
- A42-4129 37
- DETAIL SIDE VIEW 38
- TOP VIEW 38
- SIDE VIEW 38
- DHS CSCRHR 40
- PANEL DIMENSIONS (in.) 41
- INSTALLATION 42
- HR CRDHS CS 50
- FIELD PIPING CONNECTIONS* 55
- HYDRONIC COIL ARRANGEMENT 55
- MOTORIZED 58
- Table 7 — Piping Components 62
- 120-V WHT ALL OTHERS BLK 69
- NEC CLASS 1 WIRING 69
- Thermostat (24-v) 70
- THERMOSTAT PART # 702893-36 71
- NEC CLASS 2 WIRING 72
- THERMOSTAT #33CSSN2-FC 74
- ONLY 120V WHT/ALL 75
- OTHERS BLK 75
- COMMON FLO1 FLO2 FLO3 FLO4 78
- START-UP 79
- © Carrier Corporation 2014 86
- I. Project Information 87
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