48/50AJ,AK,AW,AY020-060
Single Package Rooftop
Gas Heating/Electric Cooling and Electric Cooling Units
with ComfortLink™ Controls
50/60 Hz
Wiring Diagrams
INDEX
TYPE
Component Arrangement
Power Schematic
Main Control Box Circuit
Auxiliary Control Box Wiring
Accessory Board Wiring
Gas Heat Control Circuit
(2-Stage Heat)
Gas Heat Control Circuit
(Staged Gas Heat)
Electric Heat Control Circuit
UNIT
48/50AJ,AK,AW,AY020-035
48/50AJ,AK,AW,AY040-060
48/50AJ,AK,AW,AY020-027
48/50AJ,AK,AW,AY030-035
48/50AJ,AK,AW,AY040
48/50AJ,AK,AW,AY050
48/50AJ,AK,AW,AY060
48/50AJ,AK,AW,AY020-060
48/50AJ,AK,AW,AY020-060
48/50AJ,AK,AW,AY020-060
48AJ,AK,AW,AY020-050
48AJ,AK,AW,AY060
48AJ,AW020-050
48AJ,AW060
50AJ,AK,AW,AY020-050
50AJ,AK,AW,AY060
NUMBER
48EJ502489
48EJ502490
48EJ503085
48EJ503084
48EJ503083
48EJ503082
48EJ503081
48EJ503075
48EJ503076
48EJ503086
48EJ503079
48EJ503077
48EJ502488
48EJ503078
48EJ503080
48EJ503087
FIG. NO.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
ACCESSORIES
ACCESSORY
Motormaster® V Low Ambient
Controller
Space Sensor Temperature
Averaging
UNIT
48/50AJ,AK,AW,AY020-035
48/50AJ,AK,AW,AY040-060
FIG. NO.
17
18
48/50AJ,AK,AW,AY020-060
19
NOTE: Accessory wiring is shown on the unit wiring diagrams. Refer to the appropriate drawing for accessory wiring.
The following accessories are shown on the main control box
circuit drawing (Fig. 8): thermostat, remote economizer
position override, remote economizer minimum position set
point, remote 4-20 mA economizer position, and space IAQ
sensor. The following accessories are shown on the auxiliary
control box circuit drawing (Fig. 9): outdoor enthalpy
changeover sensor and differential enthalpy changeover
sensor. The following accessories are shown on the accessory
board wiring drawing (Fig. 10): outdoor air quality sensor,
remote supply air set point, demand limit controller, outdoor
inlet cfm sensor, fan status switch, demand limit-redline,
demand limit-loadshed, fire pressurization, fire evacuation, fire
smoke purge, and IAQ override switch.
ELECTRIC HEAT POWER DIAGRAMS
UNIT SIZES
020-050
060
ELEC CHARACTERISTICS
208/230-3-60
460-3-60
380-3-60
400-3-50
575-3-60
208/230-3-60
460-3-60
380-3-60
400-3-50
575-3-60
NOMINAL kW
Lo Heat
Hi Heat
36
72
36
72
24
49
27
54
36
72
54
108
108
54
74
37
82
41
54
108
FIG. NO.
QTY PER UNIT
20
2
20
2
20
20
2
3
20
3
20
3
NOTE: All power leads connect to (single) TB7 power terminal block
– 2 or 3 conductors per terminal.
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
PC 111
Catalog No. 534-80145
Printed in U.S.A.
Form 48/50A-1W
Pg 1
2-03
Replaces: New
Book 1 1
Tab 1a 1b
LEGEND AND NOTES FOR FIG. 1-16
PLUG LOCATION REFERENCE
LEGEND
BP
C
CAP
CB
CCB
CCH
CCN
COMP
CR
CS
CSB
DP
DS
EC
ECB
EDT
EMM
EQUIP
FIOP
FU
GND
HC
HIR
HPS
HS
IAQ
IDM
IFC
IFCB
IFM
IFR
IGC
IP
L
LAT
LPT
LS
MBB
MGV
NEC
OARH
OAT
OFC
OFM
PEC
PEM
PL
PRI
R
RARH
RAT
RS
SCB
SCT
SGC
SST
TB
TC
TH
TRAN
VFD
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
Building Pressure
Contactor, Compressor
Capacitor
Circuit Breaker
Control Circuit Breaker
Crankcase Heater
Carrier Communication Network
Compressor Motor
Control Relay
Compressor Safety
Current Sensing Board
Duct Pressure
Disconnect Switch
Enthalpy Control
Economizer Control Board
Evaporator Discharge Temperature Sensor
Controls Option Board
Equipment
Factory-Installed Option
Fuse
Ground
Heater Contactor
Heat Interlock Relay
High-Pressure Switch
Hall Effect Sensor
Indoor Air Quality
Induced Draft Motor
Indoor Fan Contactor
Indoor Fan Circuit Breaker
Indoor Fan Motor
Indoor Fan Relay
Integrated Gas Unit Controller
Internal Protector
Light
Leaving Air Temperature Sensor
Low Pressure Transducer
Limit Switch
Main Base Board
Main Gas Valve
National Electrical Code
Outdoor-Air Relative Humidity
Outdoor-Air Temperature Sensor
Outdoor Fan Contactor
Outdoor Fan Motor
Power Exhaust Contactor
Power Exhaust Motor
Plug Assembly
Primary
Relay
Return Air Relative Humidity
Return Air Temperature Sensor
Rollout Switch
Staged Gas Board
Saturated Condensing Temperature Sensor
Staged Gas Controller
Saturated Suction Pressure Transducer
Terminal Block
Thermostat Cooling
Thermostat Heating
Transformer
Variable Frequency Drive
NAME
PL1
PL2
PL3
PL4
PL5
PL6
PL7
PL8
PL9
PL10
PL11
PL12
PL13
PL14
PL15
PL16
PL18
PL19
PL20
PL21
PL22
PL23
PL24
PL25
PL26
PL27
PL28
PL29
PL30
PL31
PL33
PL34
PL35
LOCATION
MAIN CB
MAIN CB
MAIN CB
MAIN CB
AUX CB
AUX CB
MAIN CB
AUX CB
ELEC HEAT
GAS HEAT
MAIN CB
AUX CB
AUX CB
ELEC HEAT
ELEC HEAT
ELEC HEAT
AUX CB
AUX CB
AUX CB
AUX CB
MAIN CB
AUX CB
AUX CB
AUX CB
AUX CB
AUX CB
MAIN CB
EVAP SECT
AUX CB
MAIN CB
MAIN CB
MAIN CB
EVAP SECT
DESCRIPTION
Communications from MMB to PL5/PL4
Smoke Detector & 24V from TB5 to AUX CBOX
Heat Control & 24V from MBB to PL9
Communications from OL1 to SCB/EMM
Communications from PL1 to ECB1 & ECB2
REM/OCC from PL7 to ECB1
REM/OCC from TB5/6 to PL6/12
ECM Control from PL12 to ECB1
Control from PL3 to IGC/HR/PL14
IDM Line Voltage from PL11 to IDM(CAP)
Line Voltage from OFC2 to PL10 (IDM)
Branch from PL2,7,8 to PL13,18,19,20
Smoke Det. Control from PL12 to Smoke Det.
Control Power to Heater Box 1
Control Power to Heater Box 2
Control/Signal from PL12 to Economizer
Control/Signal from PL12 to CO2 Sensor
Control/Signal from PL12 to Economizer
24V Power from PL12 to ECB1/ECB2
24V Power from PL20 to ECB1/PEC
Line Voltage from CCB to PEC
Pwr. Exh. from PEC to PL24,25,26,27
PEM Pwr. from PL23
PEM Pwr. from PL23
PEM Pwr. from PL23
PEM Pwr. from PL23
Thermistor Input from MMB to PL29/PL30
SAT Harness
OAT/RAT Harness
HPS/SST
Crankcase Heaters
SCT
Hot Gas By-Pass Harness
NOTES:
1. Factory wiring is in accordance with the national electrical codes. Any field
modifications or additions must be in compliance with all applicable codes.
2. Use 75° C min wire for field power supply, use copper wires for all units.
3. All circuit breakers “Must Trip Amps” are equal to or less than 156% RLA.
4. Compressor and fan motors are thermally protected — three phase motors
protected against primary single phase conditions.
5. Red jumper wire must be added between R and WI for Space Temperature
mode and temporarily during Service-Test mode when the heaters need to
operate.
Terminal Block
Terminal (Unmarked)
Terminal (Marked)
Splice
Factory Wiring
Field Wiring
To indicate common potential only, not to represent wiring.
To indicate FIOP or Accessory
2
SEQUENCE OF OPERATION
operation) so the room temperature will be at 72 F when the
occupied time starts.
If the unit has been configured for a pre-occupancy purge,
then the control will start the unit in Vent mode prior to the
occupancy time to vent the space. If an IAQ (indoor air quality)
sensor is being used and the low IAQ set point is satisfied, then
the occupancy Purge mode will be terminated.
The set points for heat and cooling are configurable through
the Scrolling Marquee display.
NOTE: If a T56 sensor is being used, then the slide bar on the
sensor can offset the set point by has much as 5 degrees.
If the space temperature rises above the cooling set point,
then the unit will go into Cooling mode. If the economizer can
be used, the control will first try to control to the Leaving
Air Temperature set point. The set point will depend on the
space temperature. If the temperature is above the Low
Demand set point, then the Low Economizer Load Discharge
Air Temperature set point will be used. If the temperature is
above the High Load Space Temperature set point, then the
High Load Leaving Air Temperature set point will be used. If
the economizer cannot satisfy the load the compressors will
be sequenced on to maintain either the low or high load
temperature set points. If the economizer cannot be used or the
unit control disables the economizer, then the unit control will
sequence the compressors based on the low and high load
space temperature variables. If two-stage control has been
selected then the control will map the compressors to the low
and high loads as defined in the loading sequence. If Adaptive
mode has been selected then the control will add and remove
compressors stages to maintain the low and high demand
leaving air set points.
If the load goes below the heating space temperature set
points, the Heating mode will initiate. The economizer will be
closed to the minimum position and (if the unit is equipped
with gas or electric heat) the first stage of heat will be
energized. If the space temperature goes below the High Load
Space Temperature set point then the control will turn on the
second stage of heat. If the unit is equipped with a staged gas
heat control option then the low load and high load demand
signal will control the Leaving Air Temperature set point and
will turn on heating stages to maintain the Leaving Air
Temperature set points.
If the unit is configured for unoccupied free cooling, mechanical cooling, or heating and the room temperature goes
above or below the unoccupied configuration set points, then
the unit control will turn on free cooling, mechanical cooling,
or heat as needed to return room temperature within the
unoccupied set points. When in this mode, the economizer
dampers will be maintained fully closed or to the minimum
unoccupied ventilation set point.
Constant Volume (CV) Units — On power up, the
control module will activate the initialization software. The
initialization software will determine the unit configuration and
also initialize any controls loops and input/output devices. All
alarms and configurations are saved in memory and maintained
during power outages. All alarms will be maintained in
memory and must be cleared through the Scrolling Marquee
display.
The unit can be configured with two different control types:
thermostat control or space temperature sensor control.
THERMOSTAT CONTROL — If the unit is equipped with a
thermostat with Y1, Y2, W1, W2 and G connections, then the
control will perform the following sequence.
When terminal G is energized, the indoor fan will turn on.
The fan must be running for heating or cooling to occur. If Y1
is closed (first stage of cooling is energized), then the unit
control will first check the ability to use the economizer. If the
economizer can be used, then the unit control will modulate the
damper open to maintain the low-load economizer leaving air
temperature set point.
If Y2 closes (second stage of cooling is energized), then the
unit control will lower the leaving air temperature set point to
the configured set point. If the economizer cannot satisfy the
load, then the compressors will be sequenced on to maintain
either the low or high load temperature set points. If the
economizer cannot be used or the enable control disables the
economizer, then the control will sequence the compressors
based on the Y1 and Y2 signals.
If two-stage control has been selected, then the unit control
will map the compressors to the Y1 and Y2 inputs (first and
second stage cooling) as defined in the loading sequence. If
Adaptive mode has been selected, then the control will add and
remove compressor stages to maintain the high and low
demand set points. If Y1 is closed (first stage of cooling
energized), at least one compressor stage will be turned on.
If W1 closes (first stage of heating is energized), then the
unit will be in the Heating mode. The economizer will be
closed to the minimum position. If the unit is equipped with
gas or electric heat, then the first stage of heat will be
energized. If W2 closes, then the unit control will turn on the
second stage of heat. If the unit is equipped with a staged gas
heat control option, then the W1 and W2 signal will be used to
control the gas heat to the configurable low and high heat load
leaving air temperature set points. If the unit is equipped with
gas heat, then the IGC board will control the operation of the
gas heat. See the Gas Heat Unit Operation section for the IGC
board sequence of operation.
SPACE TEMPERATURE SENSOR CONTROL — If space
temperature operation has been selected using a T55, T56, or
T58 sensor, then a wire jumper must be added between R, W1,
and W2. If a remote occupancy control method has been
selected, then the remote occupancy input must first be closed
for the unit to go into heat, vent, or cooling modes. If the
internal timeclock is used, the unit control module determines
the occupancy state based on the system time schedules.
If Temperature Compensated Start is active, the unit will
be controlled as in the occupied mode. The Temperature
Compensated Start function will start the unit before the
scheduled occupied time (as determined by prior operation) to
bring the space to the set point temperature when occupied
time starts. As an example, if the unoccupied set point is 60 F,
the occupied set point is 72 F, and the occupied time period
starts at 8:00 AM, the Temperature Compensated Start function
will bring on the unit at 7:45 AM (as determined from previous
Variable Air Volume Control — On power up, the
control module will activate the initialization software. The
initialization software will determine the unit configuration and
also initialize any controls loops and input/output devices. All
alarms and configurations are saved in memory and maintained
during power outages. All alarms will be maintained in
memory and must be cleared through the Scrolling Marquee
display.
The unit will first determine the mode of operation. If the
unit has been configured for space temperature demand then
the control will determine, based on the configurable set points,
if the unit should be in the Heat mode, Vent mode or Cooling
mode. If the unit is configured for return air temperature
control, then the unit control will start the fan and monitor the
return air temperature against the configurable set point to
determine if the unit should be in cooling, vent or heating
mode.
3
The MBB (Main Base Board) module board initiates and
terminates heating operation and monitors the status of the
requirements for indoor fan operation. The fan will be
controlled directly by the MBB board.
When the thermostat or room sensor calls for heating, the
MBB board will close heating relays and send power to W on
each of the IGC boards. An LED on the IGC board will be on
during normal operation. A check is made to ensure that the
rollout switches and limit switches are closed and the induceddraft motors are not running. After the induced-draft motors are
energized and speed is proven with the Hall Effect sensor on
the motor, the ignition activation period begins. The burners
will ignite within 5 seconds. When ignition occurs the IGC
board will continue to monitor the condition of the rollout and
limit switches, the Hall Effect sensor and the flame sensor.
If the unit is controlled through a room thermostat set for
fan auto., 45 seconds after ignition occurs the indoor-fan motor
will be energized and the outdoor-air dampers will open to
their minimum position. If the over-temperature limit opens
prior to the start of the indoor-fan blower, on the next attempt
the 45-second delay will be shortened to 5 seconds less than the
time from initiation of heat to when the limit tripped. Gas will
not be interrupted to the burners and heating will continue.
Once modified, the fan on delay will not change back to
45 seconds unless power is reset to the control.
If the unit is controlled through a room sensor, the indoor
fan will operate in the occupied mode and the outdoor-air
dampers will be at the minimum position. In the unoccupied
mode, the indoor fan will be energized through the IGC board
with a 45-second delay and the outside-air dampers will move
to the minimum unoccupied set point.
When additional heat is required, the second stage MBB
output relay closes and initiates power to the second stage of all
main gas valves in all sections. When the demand is satisfied,
MBB heat output relays will open and the gas valves close
interrupting the flow of gas to the main burners.
If the call for stage 1 heat lasts less than 1 minute, the
heating cycle will not terminate until 1 minute after W1
became active. If the unit is configured for intermittent fan then
the indoor-fan motor will continue to operate for an additional
45 seconds then stop and the outdoor-air dampers will close. If
the over temperature limit opens after the indoor motor is
stopped within 10 minutes of W1 becoming inactive, on the
next cycle the time will be extended by 15 seconds. The
maximum delay is 3 minutes. Once modified, the fan off delay
will not change back to 45 seconds unless power is reset to the
control.
If the control is connected to a ComfortID™ system, the
room terminals are equipped with microprocessor controls that
give commands to the base module. If linkage is active, the
control module will replace local ComfortLink™ set points
and occupancy data with linkage supplied data.
If Temperature Compensated Start is active, then the unit
control will start the unit in advance of the occupied time to
pre-cool or heat the space. If the unit is configured to use a
pre-purge cycle, then the control will start the unit in vent mode
based on a pre-start time interval. If an IAQ (indoor air quality)
sensor is being used and the low IAQ control point is satisfied
then the mode will be terminated. The mode terminates when
the occupied period starts.
If Cooling mode is required, then the controlling set point
will be the Leaving Evaporator Air Temperature set point. If an
economizer is present and the changeover control allows the
economizer to be used, then the control will first attempt to
control the leaving evaporator air temperature using free
cooling. If this cannot satisfy the load then additional
compressor stages will be turned on to maintain the leaving air
temperature. When both compressors and the economizer are
being used, the unit control will use the economizer dampers to
maintain better control of the leaving air and to prevent high
compressor cycling. If the economizer cannot be used, then it
will be set to the minimum vent position.
If the unit is equipped with an optional hot gas bypass valve,
then the unit control will use hot gas as an additional stage of
capacity. When the first stage of cooling is required, the unit
control will turn on the circuit A compressor and the hot gas
bypass valve. When additional cooling is called for, the unit
control will turn off the hot gas bypass valve. The valve will
also be used for additional freeze protection of the coils when
low evaporator refrigerant temperatures are detected using the
suction pressure tranducers.
The unit control will also monitor the supply duct pressure
and send a 4 to 20 mA signal to the factory supplied inverter to
control the speed of the fan to maintain the user-configured
supply duct status pressure. If the ComfortLink control is on
the CCN (Carrier Comfort Network) or a building linkage
system, then the control also supports static pressure reset
based on the needs of the zones.
If the unit has been enabled for occupied heat and if the
space temperature sensor (SPT), return air temperature sensor
(RAT), or CCN (in a building linkage system) demand requires
that the unit be in Heating mode, then the unit control will
energize the electric or gas heat to warm the space. In this
mode, the unit control will energize the heat interlock relay
(HIR). Note that for the linkage systems the interlock relay
connection is not required. Once the mode is enabled, the unit
control will use up to 2 stages of heat to control to the return air
temperature set point. Heating will continue until the return
temperature set point is satisfied. If the unit is configured for
morning warm-up and the heating demand is below the set
point during the first 10 minutes of operation, then the unit
control will energize full heating capacity until the return air
temperature set point is satisfied.
Indoor Air Quality — The Indoor Air Quality (IAQ)
function provides a demand-based control for ventilation air
quantity, by providing a modulating outside air damper
position that is proportional to space CO2 level. The ventilation
damper position is varied between a minimum ventilation level
(based on internal sources of contaminants and CO2 levels
other than the effect of people) and the maximum design
ventilation level (determined at maximum populated status in
the building). During a less-than-fully populated space period,
the CO2 level will be lower than maximum design ventilation
level at full-load design condition, thus less ventilation air will
be required. Reduced quantities of ventilation air will result in
reduced operating costs. Space CO2 level is monitored and
compared to user-configured set points. An accessory CO2
sensor for space (or return duct mounting) is required. The IAQ
routine can be enhanced by also installing a sensor for Outdoor
Air Quality (OAQ).
Gas Heat Unit Operation — The gas heat units incorporate 2 (3 on size 060) separate systems to provide gas heat.
Each system incorporates its own induced-draft motor,
Integrated Gas Control (IGC) board, 2-stage gas valve,
manifold, and safeties. The systems are operated in parallel.
For example, when there is a call for first stage heat, both
induced-draft motors operate, both gas valves are energized,
and both IGC boards initiate spark. All of the gas heating
control is performed through the IGC boards (located in the
heating section).
4
During the occupied period in the absence of a demand for
cooling using outside air, if CO2 level is below the set point for
the minimum ventilation level, the outside-air damper will be
opened to and maintained at the minimum ventilation level
damper position set point.
When the space CO2 level exceeds set point for the minimum ventilation level condition, the ComfortLink™ control
will begin to open the outside air damper position to admit
more ventilation air and remove the additional contaminants.
As the space CO2 level approaches the set point for maximum
design ventilation level condition, the outside air damper
position will reach the maximum ventilation level damper
position set point limit. Damper position will be modulated in a
directly proportional relationship between these two CO2 set
point limits and their corresponding damper position limits.
In most applications a fixed reference value can be set for
the outdoor air quality level, but the control also supports the
addition of an outside air quality sensor that will then be
compared to the indoor or return IAQ sensor. If an OAQ sensor
is connected, the demand set point levels will be adjusted
automatically as the outdoor CO2 levels vary. Also, if the
outdoor CO2 level exceeds a user-configured maximum limit
value, then outside air damper position will be limited to the
minimum ventilation damper set point value. The unit control
can also receive these signals through the Carrier Comfort
Network (CCN).
The IAQ and OAQ measurement levels are displayed by
the ComfortLink™ control in parts per million (PPM).
5
6
INPUTS
RMTIN
ENTH
RARH
OARH
OUTPUTS
ECONOCMD
ECONOCMD
PE_A
PE_B
PE_C
ECON_PWR
POINT NAME
INPUTS
GASFAN
FSD
G
W2
W1
Y2
Y1
CSB_A1
CSB_A2
CSB_B1
CSB_B2
DP_A / SCTA
DP_B / SCTB
SP_A / SSTA
SP_B / SSTB
RAT
EDT
OAT
SPT
SPTO
IAQ, IAQMINOV
FLTS
OUTPUTS
CMPB2
CMPB1
CMPA2
CMPA1
CONDFANB
CONDFANA
HS2
HS1
HIR
SF
ALRM
POINT NAME
RLY 1
RLY 2
RLY 3
RLY 4
RLY 5
RLY 6
RLY7
RLY 8
RLY 9
RLY 10
RLY 11
DI1
DI2
DI3
DI4
DI5
DI6
DI7
DIG1
DIG2
DIG3
DIG4
AN1
AN2
AN3
AN4
AN5
AN6
AN7
AN8
AN9
AN10
AN11
I/O POINT NAME
J10, 20-21
J10, 22-23
J10, 24-25
J10, 26-27
J10, 10-11
J10, 12-13
J10, 14-16
J10, 17-19
J10, 4-6
J10, 7-9
J10, 1-3
J6, 3-4
J6, 5-6
J7, 1-2
J7, 3-4
J7, 5-6
J7, 7-8
J7, 9-10
J9, 10-12
J9, 7-9
J9, 4-6
J9, 1-3
J8, 21-23
J8, 24-26
J8, 15-17
J8, 18-20
J8, 9-10
J8, 11-12
J8, 13-14
J8, 1-2
J8, 3-4
J8, 5-6
J8, 7-8
CONNECTOR
PIN NO.
20 = RLY1A (=RLY2A), 21 = RLY1B
22 = RLY2A (=RLY1A), 23 = RLY2B
24 = RLY3A (=RLY4A), 25 = RLY3B
26 = RLY4A (=RLY3A), 27 = RLY4B
10 = RLY5A (=RLY6A), 11 = RLY5B
12 = RLY6A (=RLY5A), 13 = RLY6B
14 = 15 = RLY7A, 16 = RLY7B
17 =1 8 = RLY8A, 19 = RLY8B
4 = 5 = RLY9A, 6 = RLY9B
7 = 8 = RLY10A, 9 = RLY10B
1 = 2 = RLY11A, 3 = RLY11B
4
6
2
4
6
8
10
10=5v, 11=Vin, 12=GND
7=5v, 8=Vin, 9=GND
4=5v, 5=Vin, 6 =GND
1=5v, 2=Vin, 3=GND
21=5v, 22=Vin, 23=GND (thermistor 21-22)
24=5v, 25=Vin, 26=GND (thermistor 24-25)
15=5v, 16=Vin, 17=GND (thermistor 15-16)
18=5v, 19=Vin, 20=GND (thermistor 18-20)
9
11
13
1
3
5
7
SIGNAL PIN(S)
1 = Closes RLY1A / RLY1B
1 = Closes RLY2A / RLY2B
1 = Closes RLY3A / RLY3B
1 = Closes RLY4A / RLY4B
1 = Closes RLY5A / RLY5B
1 = Closes RLY6A / RLY6B
1 = Closes RLY7A / RLY7B
1 = Closes RLY8A / RLY8B
1 = Closes RLY9A / RLY9B
1 = Closes RLY10A / RLY10B
1 = Closes RLY11A / RLY11B
0 = 24vac, 1= 0vac
0 = 24vac, 1= 0vac
0 = 24vac, 1= 0vac
0 = 24vac, 1= 0vac
0 = 24vac, 1= 0vac
0 = 24vac, 1= 0vac
0 = 24vac, 1= 0vac
0 = 5vdc, 1 = 0vdc
0 = 5vdc, 1 = 0vdc
0 = 5vdc, 1 = 0vdc
0 = 5vdc, 1 = 0vdc
(0-5VDC, thermistor, ohms)
(0-5VDC, thermistor, ohms)
(0-5VDC, thermistor, ohms)
(0-5VDC, thermistor, ohms)
(thermistor, ohms)
(thermistor, ohms)
(thermistor, ohms)
(thermistor, ohms)
(thermistor, ohms)
(thermistor, ohms)
(thermistor, ohms)
STATE vs CONTROL
P6.0
P6.1
P6.2
PB.0
PB.1
PB.2
PB.3
PB.4
PB.5
PB.6
PB.7
P7.1
P7.2
P7.3
P7.4
P7.5
P7.6
P7.7
PA.6
PA.5
PA.4
P4.7
AIN 0
AIN 1
AIN 2
AIN 3
AIN4
AIN 5
AIN 6
AIN7
AIN8
AIN 9
AIN 10
PORT DESIGNATION
Switch
Switch
4-20ma
4-20ma
4-20 ma
digital
relay
relay
relay
relay
Economizer actuator (analog control)
Economizer actuator (digital control)
Power Exhaust stage A
Power Exhaust stage B
Power Exhaust stage C
Economizer Power
I/O TYPE
AO1
PP/MP
RLY1
RLY 2
RLY 3
RLY 6
DI1
DI2
AN1
AN2
I/O POINT NAME
J9, 1-2
J7, 1-3
J8, 1-3
J8, 4-6
J8, 7-9
J8, 16-18
J4, 1-2
J4, 3-4
J5, 1-3
J5, 4-6
CONNECTOR
PIN NO.
1=0-20mA, 2=GND
1=PP/MP Data, 2=24VAC, 3=GND
1 = 2 = RLY1A, 3 = RLY1B
4 =5 = RLY2A, 6 = RLY2B
7 = 8 = RLY3A, 9 = RLY3B
16 = 17 = RLY6A, 18 = RLY6B
2
4
1=24VDC, 2=0-20mA in, 3=GND
4=24VDC, 5=0-20mA in, 6=GND
SIGNAL PIN(S)
0-20mA OUT
Belimo PP/MP Protocol
1 = Closes RLY1A / RLY1B
1 = Closes RLY2A / RLY2B
1 = Closes RLY3A / RLY3B
1 = Closes RLY6A / RLY6B
24VAC = 1, 0VAC = 0
24VAC = 1, 0VAC = 0
0-20mA
0-20mA
PORT STATE DETAIL
POINT INTERPRETATION
P2.0
P2.1
P2.2
P2.5
P7.7/DA1
P4.5
P4.4
AN5
AN4
1=compressor ON
1=compressor ON
1=compressor ON
1=compressor ON
1=fan ON
1=fan ON
1=stage ON
1=stage ON
1=relay ON
1=fan ON
1=relay ON
4mA=0% 20mA=100%
actuator control via PP
0=stage OFF 1=stage ON
0=stage OFF 1=stage ON
0=stage OFF 1=stage ON
0=actuator OFF 1=actuator ON
programmable sense
programmable sense
4-20mA sensor
4-20mA sensor
POINT INTERPRETATION
0=compressor OFF
0=compressor OFF
0=compressor OFF
0=compressor OFF
0=fan OFF
0=fan OFF
0=stage OFF
0=stage OFF
0=relay OFF
0=fan OFF
0=relay OFF
0vac=YAC fan OFF
24vac=YAC fan ON
switch, programmable sense
0vac=no G, unoccupied
24vac=G, occupied
0vac=no W2
24vac=W2
0vac=no W1
24vac=W1
0vac=no Y2
24vac=Y2
0vac=no Y1
24vac=Y1
low=no current, 50/60Hz pulse=current, high=bad sensor
low=no current, 50/60Hz pulse=current, high=bad sensor
low=no current, 50/60Hz pulse=current, high=bad sensor
low=no current, 50/60Hz pulse=current, high=bad sensor
0-5VDC transducer
0-5VDC transducer
10K thermistor
10K thermistor
10K thermistor
10K thermistor
10K thermistor
10K thermistor (T55 curve)
100K Pot (T56 slider)
multi-use 4-20mA with resistor
gold-plated switch, programmable sense
PORT DESIGNATION
INPUT/OUTPUT CHANNEL DESIGNATIONS — ECONOMIZER CONTROL BOARD (ECB1)
Relay
Relay
Relay
Relay
Relay
Relay
Relay
Relay
Relay
Relay
Relay
Switch Input
Switch Input
Switch Input
Switch Input
Switch Input
Switch Input
Switch Input
Digital Input
Digital Input
Digital Input
Digital Input
5 K Thermistor
5 K Thermistor
Press Transducer
Press Transducer
10K Thermistor
10K Thermistor
10K Thermistor
10K Thermistor
10K Thermistor
4-20 ma
Switch Input
TYPE OF I/O
Remote occupancy
Economizer enable
Return air relative humidity
Outdoor air relative humidity
POINT DESCRIPTION
Compressor B2
Compressor B1
Compressor A2
Compressor A1
Condenser fan B
Condenser fan A
Heat stage 2
Heat stage 1
Heat interlock relay
Supply fan
Alarm output relay
YAC Indoor Fan relay (fan request from YAC)
Fire Shutdown switch input
Thermostat 'G' input / Remote Occupied
Thermostat 'W2' input
Thermostat 'W1' input
Thermostat 'Y2' input
Thermostat 'Y1' input
Compressor A1 current sensor
Compressor A2 current sensor
Compressor B1 current sensor
Compressor B2 current sensor
Circuit A saturated condensing temperature
Circuit B saturated condensing temperature
Circuit A saturated suction pressure
Circuit B saturated suction pressure
Return air temperature
Evaporator Discharge Air Temperature
Outdoor air temperature
Space temperature (T55/56)
Space temperature offset (T56)
IAQ analog input
Filter Status
POINT DESCRIPTION
INPUT/OUTPUT CHANNEL DESIGNATIONS — MAIN BASE BOARD (MBB)
7
INPUTS
SFS
DMD_SW1
DMD_SW2
PRES
EVAC
PURG
IAQIN
OACFM
DMDLMTMA
SATRESMA
OAQ
POINT NAME
HS3
HS4
HS5
HS6
OUTPUTS
SAT1
SAT2
SAT3
INPUTS
POINT NAME
HGBPV
BP
SP
OUTPUTS
SFAN_VFD
INPUTS
POINT NAME
POINT DESCRIPTION
10K thermistor
10K thermistor
10K thermistor
Relay
Relay
Relay
Relay
AO1
PP/MP
RLY1
RLY 2
RLY 3
RLY 6
DI1
DI2
AN1
AN2
I/O POINT NAME
J9, 1-2
J7, 1-3
J8, 1-3
J8, 4-6
J8, 7-9
J8, 16-18
J4, 1-2
J4, 3-4
J5, 1-3
J5, 4-6
CONNECTOR
PIN NO.
1=0-20mA, 2=GND
1=PP/MP Data, 2=24VAC, 3=GND
1 = 2 = RLY1A,
3 = RLY1B
4 =5 = RLY2A,
6 = RLY2B
7 = 8 = RLY3A,
9 = RLY3B
16 = 17 = RLY6A, 18 = RLY6B
2
4
1=24VDC, 2=0-20mA in, 3=GND
4=24VDC, 5=0-20mA in, 6=GND
SIGNAL PIN(S)
0-20mA OUT
Belimo PP/MP Protocol
1 = Closes RLY1A / RLY1B
1 = Closes RLY2A / RLY2B
1 = Closes RLY3A / RLY3B
1 = Closes RLY6A / RLY6B
24VAC = 1, 0VAC = 0
24VAC = 1, 0VAC = 0
0-20mA
0-20mA
PORT STATE DETAIL
0=PE stage 4 OFF
0=PE stage 5 OFF
0=PE stage 6 OFF
P2.0
P2.1
P2.2
P2.5
J8, 1-2
J8, 3-4
J9, 1-3
J9, 4-6
J9, 7-9
J9, 10-12
J9, 13-15
J5, 1-3
J5, 4-6
J5, 7-9
J5, 10-12
J5, 13-15
J6, 1-3
J6, 4-6
J6, 7-9
J7, 1-2
J7, 3-4
CONNECTOR
PIN NO.
1=0-20mA,
3=0-20mA,
1 = 2 = RLY1A,
4 =5 = RLY2A,
7 = 8 = RLY3A,
10 = 11 = RLY4A,
13 = 14 = RLY5A,
1=5v, 2=Vin, 3=GND
4=5v, 5=Vin, 6=GND
7=5v, 8=Vin, 9=GND
10=5v, 11=Vin, 12=GND
13=5v, 14=Vin, 15=GND
1=5v, 2=Vin, 3=GND
4=5v, 5=Vin, 6=GND
7=5v, 8=Vin, 9=GND
1
3
2=GND
4=GND
3 = RLY1B
6 = RLY2B
9 = RLY3B
12 = RLY4B
15 = RLY5B
(thermistor 1-2)
(thermistor 4-5)
(thermistor 7-8)
(thermistor 10-11)
(thermistor 13-14)
(thermistor 1-2)
(thermistor 4-5)
(thermistor 7-8)
SIGNAL PIN(S)
0-20mA OUT
0-20mA OUT
1 = Closes RLY1A / RLY1B
1 = Closes RLY2A / RLY2B
1 = Closes RLY3A / RLY3B
1 = Closes RLY4A / RLY4B
1 = Closes RLY5A / RLY5B
(0-5VDC, thermistor, ohms)
(0-5VDC, thermistor, ohms)
(0-5VDC, thermistor, ohms)
(0-5VDC, thermistor, ohms)
(0-5VDC, thermistor, ohms)
(0-5VDC, thermistor, ohms)
(0-5VDC, thermistor, ohms)
(0-5VDC, thermistor, ohms)
(thermistor, ohms)
(thermistor, ohms)
PORT STATE DETAIL
Switch
Switch
Switch
Switch
Switch
Switch
Switch
4-20 ma
4-20 ma
4-20 ma
4-20 ma
TYPE OF I/O
DI 1
DI 2
DI 3
DI 4
DI 5
DI 6
DI 7
AN7
AN8
AN9
AN10
AN1
AN2
AN3
AN4
AN5
AN6
I/O POINT NAME
J7, 1-2
J7, 3-4
J7, 5-6
J7, 7-8
J7, 9-10
J7, 11-12
J7, 13-14
J6, 1-3
J6, 4-6
J6, 7-9
J6, 10-12
J5, 1-2
J5, 3-4
J5, 5-6
J5, 7-8
J5, 9-10
J5, 11-12
CONNECTOR
PIN NO.
2
4
6
8
10
12
14
2 (1 = loop power)
5 (4 = loop power)
8 (7 = loop power)
11 (10 = loop power)
1
3
5
7
9
11
SIGNAL PIN(S)
0 = 24vac, 1= 0vac
0 = 24vac, 1= 0vac
0 = 24vac, 1= 0vac
0 = 24vac, 1= 0vac
0 = 24vac, 1= 0vac
0 = 24vac, 1= 0vac
0 = 24vac, 1= 0vac
(0-20mA input)
(0-20mA input)
(0-20mA input)
(0-20mA input)
(thermistor, ohms)
(thermistor, ohms)
(thermistor, ohms)
(thermistor, ohms)
(thermistor, ohms)
(thermistor, ohms)
STATE vs CONTROL
INPUT/OUTPUT CHANNEL DESIGNATIONS — CONTROLS OPTION BOARD
AO1
AO2
RLY1
RLY 2
RLY 3
RLY 4
RLY 5
AN1
AN2
AN3
AN4
AN5
AN6
AN7
AN8
AN9
AN10
I/O POINT NAME
P8.0
P8.1
P8.2
P8.3
P8.4
P8.5
P8.6
AIN 9
AIN 8
AIN 7
AIN 6
AIN 5
AIN 4
AIN 3
AIN 2
AIN1
AIN 0
PORT DESIGNATION
U7, P1-4
U7,P7-6
U7,P8-5
U7,P8-4
U7,P8-3
U7,P8-2
U7,P8-1
U12,AIN0
U12,AIN1
U12,AIN2
U12,AIN3
U12,AIN4
U12,AIN5
U12,AIN6
U12,AIN7
U12,AIN8
U12,AIN9
PORT DESIGNATION
1=PE stage 4 ON
1=PE stage 5 ON
1=PE stage 6 ON
20mA=max Hz
1=stage ON
1=stage ON
1=stage ON
1=stage ON
1=stage ON
POINT INTERPRETATION
0=stage OFF
0=stage OFF
0=stage OFF
0=stage OFF
0=stage OFF
10K thermistor
10K thermistor
10K thermistor
POINT INTERPRETATION
4mA=0Hz
4-20mA pressure transmitter
4-20mA pressure transmitter
POINT INTERPRETATION
P7.7/DA1
P4.5
P4.4
AN5
AN4
PORT DESIGNATION
INPUT/OUTPUT CHANNEL DESIGNATIONS — STAGED HEAT CONTROL BOARD
relay
4-20 ma
4-20 ma
4-20 ma
I/O TYPE
I/O TYPE
Supply Fan Status switch
Demand Limit - Redline
Demand Limit - Load Shed
Fire Pressurization
Fire Evacuation
Smoke Purge
Indoor Air Quality Override Switch
Outside Air CFM
4-20mA Demand Limit
4-20mA Supply Air Setpoint
Outside Air CO2 Sensor
Not used
Not used
Not used
Not used
Not used
Not used
not used
not used
Heat Stage 3
Heat Stage 4
Heat Stage 5
Heat Stage 6
not used
not used
Supply air temperature 1
Supply air temperature 2
Supply air temperature 3
not used
not used
not used
not used
not used
POINT DESCRIPTION
Supply Fan Inverter speed
not used
not used
not used
not used
Hot Gas Bypass Valve
not used
not used
Building static pressure
Supply Duct static pressure
POINT DESCRIPTION
INPUT/OUTPUT CHANNEL DESIGNATIONS — VAV CONTROL BOARD (ECB2)
8
Fig. 1 — Component Arrangement — 48/50AJ,AK,AW,AY020-035 Units
CONTROLS OPTION BOARD
9
Fig. 2 — Component Arrangement — 48/50AJ,AK,AW,AY040-060 Units
CONTROLS OPTION BOARD
10
Fig. 3 — Power Schematic — 48/50AJ,AK,AW,AY020-027 Units
11
Fig. 4 — Power Schematic — 48/50AJ,AK,AW,AY030-035 Units
12
Fig. 5 — Power Schematic — 48/50AJ,AK,AW,AY040 Units
13
Fig. 6 — Power Schematic — 48/50AJ,AK,AW,AY050 Units
14
Fig. 7 — Power Schematic — 48/50AJ,AK,AW,AY060 Units
15
Fig. 8 — Main Control Box Circuit — 48/50AJ,AK,AW,AY020-060 Units
16
Fig. 9 — Auxiliary Control Box Wiring — 48/50AJ,AK,AW,AY020-060 Units
17
Fig. 10 — Accessory Board Wiring — 48/50AJ,AK,AW,AY020-060 Units
18
Fig. 11 — Gas Heat Control Circuit (2-Stage Heat) — 48/50AJ,AK,AW,AY020-050 Units
19
Fig. 12 — Gas Heat Control Circuit (2-Stage Heat) — 48/50AJ,AK,AW,AY060 Units
20
Fig. 13 — Gas Heat Control Circuit (Staged Gas Heat) — 48/50AJ,AW020-050 Units
21
Fig. 14 — Gas Heat Control Circuit (Staged Gas Heat) — 48AJ,AW060 Units
22
Fig. 15 — Electric Heat Control Circuit — 50AJ,AK,AW,AY020-050 Units
23
Fig. 16 — Electric Heat Control Circuit — 50AJ,AK,AW,AY060 Units
A
DPA
BLK
BLK
GRN
GRN
RED
RED
B
6
MM-F
5
2
CCB
11
21
FUSE
BLK
L1
T1
BLK
12
22
FUSE
YEL
L1
T2
RED
2
13
23
FUSE
BLU
L1
T3
BLU
3
1
OFM2
SEE NOTE 1
1
2
NOTES:
1. Motormaster® control to be wired directly to CCB
circuit breaker and the OFC1 contactor should be
removed from the wiring.
2. Connect Start relay FR to the following terminals:
230-3-60 TB1-TB2
460-3-60 TB1-TB2
575-3-60 TB1-TB2
208-3-60 TB13A-TB2
3. Add FR relay in parallel with OFC1 (see Fig. 8).
2
CCB
DPA
FR
MM
MM-F
OFC
OFM
TB
4
FR
FR
1
3
—
—
—
—
—
—
—
—
LEGEND
Control Circuit Breaker
Duct Pressure Transducer
Fan Relay
Motormaster V
Motormaster V Fuses
Outdoor-Fan Contactor
Outdoor-Fan Motor
Terminal Block
C1 OFC1 C2
Fig. 17 — Motormaster V Accessory Wiring — 48/50AJ,AK,AW,AY020-035 Units
DPA
BLK
BLK
GRN
GRN
RED
RED
MM-F
6
CCB
5
BLK
1
RED
2
BLU
3
2
11
21
FUSE
BLK
L1
T1
BLK
1
12
22
FUSE
YEL
L1
T2
RED
2
13
23
FUSE
BLU
L1
T3
BLU
3
NOTES:
1. Motormaster control to be wired directly to CCB circuit breaker and the OFC1 contactor should be
removed from the wiring.
2. Connect Start relay FR to the following terminals:
230-3-60 TB1-TB2
460-3-60 TB1-TB2
575-3-60 TB1-TB2
208-3-60 TB13A-TB2
3. Add FR relay in parallel with OFC1 (see Fig. 8).
MM
OFM1
OFM2
SEE NOTE 1
1
2
2
4
FR
1
FR
3
CCB
DPA
FR
MM
MM-F
OFC
OFM
TB
—
—
—
—
—
—
—
—
LEGEND
Control Circuit Breaker
Duct Pressure Transducer
Fan Relay
Motormaster V
Motormaster V Fuses
Outdoor-Fan Contactor
Outdoor-Fan Motor
Terminal Block
C1 OFC1 C2
Fig. 18 — Motormaster V Accessory Wiring — 48/50AJ,AK,AW,AY040-060 Units
24
SPACE TEMPERATURE AVERAGING — 4 SENSOR APPLICATION
SPACE TEMPERATURE AVERAGING — 9 SENSOR APPLICATION
Fig. 19 — Space Temperature Averaging Wiring
25
72 kW, 208/230 V, SIZES 020-050
108 kW, 208/230 V, SIZE 060
36 kW, 208/230 V, SIZES 020-050
54 kW, 208/230 V, SIZE 060
36 kW, 460 V, SIZES 020-050
24 kW, 380 V, SIZES 020-050
27 kW, 400 V, SIZES 020-050
54 kW, 460 V, SIZE 060
37 kW, 380 V, SIZE 060
41 kW, 400 V, SIZE 060
72 kW, 460 V, SIZES 020-050
49 kW, 380 V, SIZES 020-050
54 kW, 400 V, SIZES 020-050
108 kW, 460 V, SIZE 060
74 kW, 380 V, SIZE 060
82 kW, 400 V, SIZE 060
36 kW, 575 V, SIZES 020-050
54 kW, 575 V, SIZE 060
72 kW, 575 V, SIZES 020-050
108 kW, 575 V, SIZE 060
Fig. 20 — Electric Heater Power Diagrams
26
Copyright 2003 Carrier Corporation
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
PC 111
Catalog No. 534-80145
Printed in U.S.A.
Form 48/50A-1W
Pg 28
2-03
Replaces: New
Book 1 1
Tab 1a 1b