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79
Economizer Control Board (ECB)
The ECB controls the economizer actuator. (See Fig. 33 and
Table 30.) The control signal from the ECB uses either the
MFT (Multi-Function Technology) digital communication pro-
tocol or a 4 to 20 mA output signal as defined by the configura-
tion
Configuration
ECON
E.CTL
. The ECB has inputs for
Indoor Air Quality (IAQ), Outdoor Air Quality (OAQ), enthal-
py and RH sensor. It also controls two power exhaust outputs.
By digitally communicating with the ECB, the economizer ac-
tuator is able to provide the damper position and diagnostic in-
formation to the
Comfort
Link controller. The damper position
is displayed at
Outputs
ECON
EC.AP
. Diagnostic informa-
tion is displayed via Alert T414. More information about these
alarms is contained in the Alarms and Alerts section.
NOTE: The Economizer Control Board (ECB) has a 4-position
DIP switch that is factory set to ‘0’ (ON, towards the center of the
board). Do not change this setting.
Fig. 33 — Economizer Control Board (ECB)
Table 30 — Economizer Control Board (ECB) Connections
DISPLAY NAME
POINT DESCRIPTION
SENSOR LOCATION
TYPE OF I/O
CONNECTION PIN
NUMBER
INPUTS
Input power from MBB
control box
24 VAC
J1, 1- 2
RM.OC
Remote occupancy switch
field installed
switch input
J4, 2
ENTH or IAQ.S
Outdoor enthalpy switch, or Indoor air
quality switch
economizer, or return/space
switch input
J4, 4
IAQ
Indoor air quality sensor
return/space
0-20 mA
J5, 2
OAQ or SP.RH
Outdoor air quality sensor, or Relative
humidity sensor
field installed
0-20 mA
J5, 5
Sensor Common
Ground
J5, 3
Actuator Common
Ground
J7, 3
OUTPUTS
Output power to enthalpy switch
24 VAC
J4, 3
Output power for loop power sensors
24 VDC
J5, 1
Output power to economizer actuator
24 VAC
J7, 2
PE.1
Power exhaust 1 relay
relay
J8, 3
PE.2
Power exhaust 2 relay
relay
J8, 6
EC.CP
Commanded Economizer position
0-20 mA
J9, 1
COMMUNICATION
Local Equipment Network (LEN)
communication
J2, 1-3
Carrier Comfort Network (CCN)
communication
J3
EC.CP & EC.AP
Economizer actuator position (digital
control)
MFT communication
J7, 1
Summary of Contents for /50HC 04-28
Page 69: ...69 Fig 24 Typical Control Diagram for 48HC 04 14 Units 48HC 08 09 shown ...
Page 70: ...70 Fig 25 Typical Power Diagram for 48HC 04 14 Units 48HC 08 09 shown ...
Page 71: ...71 Fig 26 Typical Control Diagram for 50HC 04 14 Units 50HC 14 shown ...
Page 72: ...72 Fig 27 Typical Power Diagram for 50HC 04 14 Units 50HC 14 Non Humidi MiZer shown ...
Page 73: ...73 Fig 28 Typical Control Diagram 48HC 17 28 Units ...
Page 74: ...74 Fig 29 Typical Control Diagram 50HC 17 28 Units ...
Page 75: ...75 Fig 30 Typical Humid MiZer Power Diagram and Component Arrangement 48 50HC 17 28 Units ...
Page 76: ...76 Fig 31 Typical Non Humid MiZer Power Diagram and Component Arrangement 48 50HC 17 28 Units ...
Page 89: ...89 Fig 42 Modulating ERV Wiring Schematic ...
Page 90: ...90 Fig 43 EnergyX ERV Control Box Component Layouts ...
Page 101: ...101 Fig 59 Exhaust Fan Assembly Removal Exhaust Fan Assembly ...
Page 141: ......