120
Table 92 — Field Terminal Connections (cont)
LEGEND
Table 93 — IGC Board Inputs and Outputs
SCROLLING MARQUEE — This device is the keypad in-
terface used to access the control information, read sensor
values, and test the unit. The scrolling marquee display is a
4-key, 4-character, 16-segment LED display as well as an
Alarm Status LED. See Fig. 30. The display is easy to operate
using 4 buttons and a group of 11 LEDs that indicate the
following menu structures:
• Run Status
•Service Test
• Temperatures
•Pressures
• Set points
• Inputs
• Outputs
• Configuration
• Timeclock
• Operating Modes
•Alarms
Through the scrolling marquee, the user can access all the
inputs and outputs to check on their values and status. Because
the unit is equipped with suction pressure transducers and
discharge saturation temperature sensors, the scrolling marquee
can also display pressures typically obtained from gages. The
control includes a full alarm history, which can be accessed
from the display. In addition, through the scrolling marquee the
user can access a built-in test routine that can be used at start-
up commission and to diagnose operational problems with the
unit. The scrolling marquee is located in the main control box
and is standard on all units.
SUPPLY FAN — The 48/50Z030-050 units are equipped with
a single 25 x 25-in. forward-curved fan. The 48/50Z055-070
units are equipped with a single 30 x 27-in. forward-curved
fan. The 48/50Z075-105 units are equipped with either a single
36 x 30-in. forward-curved fan or a 36-in. airfoil fan. The fan
sleds are spring isolated and driven by a single, 3-phase motor.
The fan is controlled directly by the ComfortLink™ controls.
VARIABLE FREQUENCY DRIVE (VFD) — On variable
air volume units with optional VFD, the supply fan speed is
controlled by a 3-phase VFD. The VFD is located in the supply
fan section (030-050 units) or mixing box section (055-105
units) behind an access door. The VFD speed is controlled di-
rectly by the ComfortLink™ controls through a 4 to 20 mA
signal based on a supply duct pressure sensor. The VFD has a
display, which can be used for service diagnostics, but setup of
the building pressure and control loop factors should be done
through the scrolling marquee display. The VFD is powered
during normal operation to prevent condensation from forming
on the boards during the off mode and is stopped by driving the
speed to 0 (by sending a 4 mA signal to the VFD).
The Z Series units use ABB VFDs. The interface wiring for
the VFDs is shown in Fig. 31. Terminal designations are shown
in Table 94.
BOARD
NO.
TERMINAL
NUMBER DESCRIPTION TYPE
TB204 - FIELD CONNECTIONS (in Main Control Box)
TB204
1 Demand Limit Redline 24 vac out external contact (maximum 24 vac, 3 A)
2 Demand Limit Redline 24 vac in external contact (maximum 24 vac, 3 A)
3 Demand Limit Loadshed 24 vac out external contact (maximum 24 vac, 3 A)
4 Demand Limit Loadshed 24 vac in external contact (maximum 24 vac, 3 A)
5 Fire Pressuration 24 vac out external contact (maximum 24 vac, 3 A)
6 Fire Pressuration 24 vac in external contact (maximum 24 vac, 3 A)
7 Fire Evacuation 24 vac out external contact (maximum 24 vac, 3 A)
8 Fire Evacuation 24 vac in external contact (maximum 24 vac, 3 A)
9 Fire Smoke Purge 24 vac out external contact (maximum 24 vac, 3 A)
10 Fire Smoke Purge 24 vac in external contact (maximum 24 vac, 3 A)
11 IAQ Switch 24 vac out external contact (maximum 24 vac, 3 A)
12 IAQ Switch 24 vac in external contact (maximum 24 vac, 3 A)
13 Not Used —
14 Not Used —
15 Not Used —
16 Not Used —
IAQ — Indoor Air Quality
VAV — Variable Air Volume
POINT NAME POINT DESCRIPTION CONNECTOR
PIN NO.
INPUTS
RT 24 Volt Power Supply RT,C
W Heat Demand 2
GFan 3
LS Limit Switch 7,8
RS Rollout Switch 5,6
SS Hall Effect Sensor 1,2,3
CS Centrifugal Switch (Not Used) 9,10
FS Flame Sense FS
OUTPUTS
CM Induced Draft Motor CM
IFO Indoor Fan IFO
R 24 Volt Power Output (Not Used) R
SPARK Sparker —
LED Display LED
Run Status
Service Test
Temperature
Pressures
Setpoints
Inputs
Outputs
Configuration
Time Clock
Operating Modes
Alarms
Alarm Status
ENTER
MODE
ESCAPE
Fig. 30 — Scrolling Marquee