Controls, Start-Up, Operation, Service and ... - Climayoreo

ACCSY — Accessory
ACC’Y — Accessory
AN — Analog
APS — Air Pressure Switch
BM — Blower Motor
BR — Blower Relay
C — Compressor Contactor
CB — Compressor Circuit Breaker
CBT — Circuit Breaker, Transformer
CCB — Control Circuit Breaker
CCH — Crankcase Heater
CCN — Carrier Comfort Network®
CCT — Cooling Coil Thermistor
CEM — Controls Expansion Module
CM — Combustion Motor
CMR — Compressor Modulation Relay
COMP — Compressor
CR — Control Relay
CSB — Current Sensor Board
CXB — Compressor Expansion Board
DGS — Discharge Gas Sensor
DI — Digital Input
DPT — Discharge Pressure Transducer
DTT — Discharge Temperature Thermistor
DUS — Digital Unloader Solenoid
ECON — Economizer
EQUIP — Equipment
EXB — Economizer Control Board
EXH — Exhaust
EXV — Electronic Expansion Valve
FU — Fuse
GND — Ground
GVR — Gas Valve Relay
HC — Heater Contactor
HIR — Heat Induction Relay
HMV — Humidi-MiZer Valve
ROOFTOP CONTROL BOARD (RXB) — The RXB has
additional inputs and outputs required for the control of the
unit. All units have an RXB board. See Fig. 30. The board has
9 inputs and 8 outputs. Details can be found in Table 93. The
RXB board is located in the main control box.
ECONOMIZER CONTROL BOARD (EXB) — The EXB
is used on size 075-100 units with optional return/exhaust fan,
optional digital scroll compressor, or accessory humidifier. See
Fig. 30. The board has inputs to sense the return fan cfm and
supply fan cfm. This board is located in the main control box.
Input and output assignments are summarized in Table 94.
STAGED GAS HEAT BOARD (SCB) — When optional
staged gas heat is used, the SCB board is installed and controls
additional stages of gas heat. See Fig. 31. The SCB also provides
additional sensors for monitoring of the supply-air and
limit switch temperatures. This board is located in the main
unit control box. The inputs and outputs are summarized in
Table 95.
CONTROL EXPANSION MODULE (CEM) — The optional
CEM is used to provide inputs for demand limiting, remote set
point and other optional inputs typically needed for energy
management systems. See Fig. 32. On CCN systems these
inputs can be interfaced to through the CCN communications.
It is located in the main control box. The CEM also has inputs
for accessory relative humidity sensors. This board is also used
on units equipped with optional outdoor air CFM monitoring.
The inputs and outputs are summarized in Table 96.
The optional (or accessory) CEM is used to accept inputs
for additional sensors or control sequence switches, including:
• Smoke control mode field switches
• VAV supply air set point reset using an external 4 to
20 mA signal
• Outdoor air CO 2 sensor
• Space, return and/or outdoor air relative humidity
sensors
LEGEND FOR FIG. 19-28
HPS — High-Pressure Switch
HS — Hall Effect Sensor
HV — High Voltage
I — Ignitor
IAQ — Indoor Air Quality
IDM — Induced Draft Motor
IFC — Indoor Fan Contactor
IFCB — Indoor Fan Circuit Breaker
IFM — Indoor Fan Motor
IGC — Integrated Gas Controller
LEN — Local Equipment Network
LLS — Liquid Line Solenoid
LON — Local Operating Network
LS — Limit Switch
MBB — Main Base Board
MGV — Main Gas Valve
MLV — Minimum Load Valve
NEC — National Electrical Code
OA — Outdoor Air
OAQ — Outdoor Air Quality
OAT — Outdoor-Air Thermostat
OD — Outdoor
OFC — Outdoor Fan Contactor
OFM — Outdoor Fan Motor
OPT — Option
PE — Power Exhaust
PEC — Power Exhaust Contactor
PECB — Power Exhaust Circuit Breaker
PEM — Power Exhaust Motor
PL — Plug Assembly
PTC — Positive Temperature Coefficient
Power Reference
RA — Return Air
RAT — Return Air Thermistor
RET — Return
RF — Return Fan
127
RS — Rollout Switch
RXB — Rooftop Control Board
SAT — Supply Air Thermistor
SCB — Staged Gas Control Board
SEN — Sensor
SPT — Suction Pressure Transducer
STDU — Standard Tier Display Unit
TB — Terminal Block
TRAN — Transformer
UPC — Unitary Protocol Converter
VAV — Variable Air Volume
VFD — Variable Frequency Drive
Terminal Block
Terminal (Unmarked)
Terminal (Marked)
Splice
Factory Wiring
Field Wiring
To indicate common potential
only, not to represent wiring.
To indicate factory-installed
option or accessory
• IAQ function discrete switch
• Demand limit sequence proportional signals or discrete
switches
The CEM is factory-installed when the outdoor air cfm control
option is installed.
COMPRESSOR EXPANSION BOARD (CXB) — The
CXB is used on size 090 and 100 units only to provide additional
compressor outputs and CSB inputs. See Table 97.
EXPANSION VALVE CONTROL BOARD (EXV) —
The EXV is used on Humidi-MiZer ® equipped units only. It is
used to provide control of the condenser and bypass modulating
valves. See Table 98.
LOW VOLTAGE TERMINAL STRIP — This circuit board
provides a connection point between the major control boards
and a majority of the field-installed accessories. See Table 99.
The circuit breakers for the low voltage control transformers,
interface connection for the Carrier Comfort Network ® (CCN)
communication, and interface connection for the Local Equipment
Network (LEN) communication are also located on the
low voltage terminal strip.
INTEGRATED GAS CONTROL (IGC) — One IGC is provided
with each bank of gas heat exchangers. One is used on
low heat size 030-050 units. Two are used on high heat size
030-050 units and low heat 055-100 units. Three are used on
high heat 055-100 units. The IGC controls the direct spark ignition
system and monitors the rollout switch, limit switches,
and induced-draft motor Hall Effect switch. The IGC is
equipped with an LED (light-emitting diode) for diagnostics.
See Table 100.
CURRENT SENSOR BOARD (CSB) — This board monitors
the status of the compressor by sensing the current flow to
the compressors and then provides digital status signal to the
MBB and CXB.