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60
Table 26 — LEDs
Outdoor Air Enthalpy Control (P/N
33CSENTHSW)
The enthalpy control (33CSENTHSW) is available as a
field-installed accessory to be used with the EconoMi$er2
damper system. The outdoor air enthalpy sensor is part of the
enthalpy control. (The separate field-installed accessory re-
turn air enthalpy sensor (33CSENTSEN) is required for dif-
ferential enthalpy control. See Fig. 93.)
Locate the enthalpy control in the economizer next to the
Actuator Motor. Locate two GRA leads in the factory harness
and connect the gray lead labeled “ESL” to the terminal la-
beled “LOW.” See Fig. 94. Connect the enthalpy control
power input terminals to economizer actuator power leads
RED (connect to 24-v) and BLK (connect to GND).
The outdoor enthalpy changeover setpoint is set at the en-
thalpy controller.
Fig. 93 — Enthalpy Switch (33CSENTHSW)
Connections
DIFFERENTIAL ENTHALPY CONTROL
Differential enthalpy control is provided by sensing and
comparing the outside air and return air enthalpy conditions.
Install the outdoor air enthalpy control as described above.
Add and install a return air enthalpy sensor.
RETURN AIR ENTHALPY SENSOR
Mount the return-air enthalpy sensor (33CSENTSEN) in the
return-air section of the economizer. The return air sensor is
wired to the enthalpy controller (33CSENTHSW). See Fig. 94.
Fig. 94 — Outside and Return Air Enthalpy Sensor
Wiring
To wire the return air enthalpy sensor, perform the following:
1. Use a 2-conductor, 18 or 20 AWG, twisted pair cable to
connect the return air enthalpy sensor to the enthalpy
controller.
2. Connect the field-supplied RED wire to (+) spade con-
nector on the return air enthalpy sensor and the (+) termi-
nal on the enthalpy controller. Connect the BLK wire to
(–) spade connector on the return air enthalpy sensor and
the (
–
) terminal on the enthalpy controller.
Smoke Detectors
Smoke detectors are available as factory-installed options
on 50HC**14 models. Smoke detectors may be specified for
Supply Air only or for Return Air without or with economizer
or in combination of Supply Air and Return Air. Return Air
smoke detectors are arranged for vertical return configura-
tions only. All components necessary for operation are facto-
ry-provided and mounted. The unit is factory-configured for
immediate smoke detector shutdown operation; additional
wiring or modifications to unit terminal board may be neces-
sary to complete the unit and smoke detector configuration to
meet project requirements.
The LEDs on the RTU Open Control Board (see Fig. 79) show the status of certain functions
If this LED is on...
Status is...
Power
The RTU Open controller has power
Rx
The RTU Open controller is receiving data from the network segment
Tx
The RTU Open controller is transmitting data over the network segment
BO#
The binary output is active
The
Run
and
Error
LEDs indicate control module and network status
If Run LED shows...
And Error LED shows...
Status is...
2 flashes per second
Off
Normal
2 flashes per second
2 flashes, alternating with Run LED
Five minute auto-restart delay after system error
2 flashes per second
3 flashes, then off
Control module has just been formatted
2 flashes per second
4 flashes, then pause
Two or more devices on this network have the same
MSTP network address
2 flashes per second
On
Exec halted after frequent system errors or control pro-
grams halted
5 flashes per second
On
Exec start-up aborted, Boot is running
5 flashes per second
Off
Firmware transfer in progress, Boot is running
7 flashes per second
7 flashes per second, alternating with Run LED
Ten second recovery period after brownout
14 flashes per second
14 flashes per second, alternating with Run LED Brownout
On
On
Failure. Try the following solutions:
· Turn the RTU Open controller off, then on.
· Format the RTU Open controller.
· Download memory to the RTU Open controller.
· Replace the RTU Open controller.
7
CTB ECON
(P
’
LINK: to J4-2) or
(RTU Open: to J2-6)
LOW
GND
24V
Enth
a
lpy
S
witch
GRA
BLK
RED
FACTORY WIRING HARNE
SS
PL6-1 (24-V)
PL6-4 (COM)
GRA
BLK
RED
–
4-20
MAIN
+
VDC
OUT
–
4-20 MAIN
OUT
+
24-
3
6
VDC IN
LOW
GND
24V
7
PL6-1 (24-V)
PL6-4 (COM)
OUT
S
IDE AIR
ENTHALPY
S
WITCH
RETURN AIR
ENTHALPY
S
EN
S
OR
CTB ECON
(P
’
LINK: to J4-2) or
(RTU Open: to J2-6)
Summary of Contents for WeatherMaster 50HC14
Page 4: ...4 Fig 2 Unit Dimensional Drawing 14 Size Unit ...
Page 5: ...5 Fig 2 Unit Dimensional Drawing 14 Size Unit cont HORIZONTAL ECONOMIZER VERTICAL ECONOMIZER ...
Page 8: ...8 Fig 4 Roof Curb Details ...
Page 24: ...24 Fig 46 Typical Humidi MiZer Adaptive Dehumidification System Humidistat Wiring ...
Page 39: ...39 Fig 54 50HC14 Control Box Component Locations with ComfortLink Controls ...
Page 40: ...40 Fig 55 50HC14 ComfortLink Control Wiring Diagram ...
Page 41: ...41 Fig 56 50HC14 ComfortLink Power Wiring Diagram ...
Page 42: ...42 Fig 57 50HC14 ComfortLink with Humidi MiZer Power Wiring Diagram ...
Page 44: ...44 Fig 60 PremierLink Wiring Schematic ...
Page 45: ...45 Fig 61 PremierLink Wiring Schematic with Humidi MiZer System Option ...
Page 53: ...53 Fig 80 RTU Open System Control Wiring Diagram ...
Page 54: ...54 Fig 81 RTU Open System Control Wiring Diagram with Humidi MiZer System Option ...
Page 64: ......
Page 65: ......