147
Table 113 — IGC Board Inputs and Outputs
Table 114 — TR1 Board Inputs and Outputs
Table 115 — SC30 Board Inputs and Outputs
SCROLLING MARQUEE
This device is the keypad interface 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 dis-
play as well as an Alarm Status LED. See Fig. 34. 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
Fig. 34 — Scrolling Marquee
Through the scrolling marquee, the user can access all the in-
puts and outputs to check on their values and status. Because
the unit is equipped with suction pressure transducers and dis-
charge 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 48/50P030-050 units are equipped with a single 25-in. x
25-in. forward-curved fan. The 48/50P055-070 units are
equipped with a single 30-in. x 27-in. forward-curved fan. The
48/50P075-100 units are equipped with either a single 36-in. 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 units equipped with optional supply fan and/or exhaust fan
VFDs, the fan speed is controlled by a 3-phase VFD. The sup-
ply fan VFD is located in the supply fan section (030-050 size
units) or mixing box section (055-100 size units) behind an ac-
cess door. For 055-100 size units with optional VFD power ex-
haust, the exhaust VFD is located in the mixing box section be-
hind an access door. For 030-050 units, it is located in the sup-
ply fan section. For 075-100 size units with optional high
capacity power exhaust or return fan, the exhaust fan VFD is
located in the mixing box section behind an access door.
The P Series units use ABB VFDs. The VFDs communicate to
the ComfortLink MBB over the local equipment network
(LEN). The VFD speed is controlled directly by the Com-
fortLink controls over the LEN. The interface wiring for the
VFDs is shown in Fig. 35 and the terminal designations are
shown in Table 116. The VFD has a keypad display panel that
can be used for service diagnostics and setting the initial VFD
parameters required to allow the VFD to communicate on the
LEN. Additional VFD parameters are set by the ComfortLink
controls, and sent to the VFD over the LEN at power up of the
VFD. The VFD faults can be reset with the VFD keypad or
through the ComfortLink controls (Alarms
R.CUR =Yes).
POWER EXHAUST
The units can be equipped with an optional power exhaust sys-
tem. The power exhaust fans are two belt-drive forward-curved
fans. On non-modulating systems, the fans are staged by the
ComfortLink controls based on the economizer damper posi-
tion. For modulating (CV or VAV) applications, the fans are
turned on by the ComfortLink controls based on building pres-
sure sensed by the building pressure transducer. The fan output
is modulated via discharge dampers communicating actuators
to maintain the building pressure set point.
POINT NAME POINT DESCRIPTION
CONNECTOR
PIN NO.
INPUTS
RT 24 Volt Power Supply RT,C
WHeat 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
TERMINAL TYPE OF I/O RESULT/ACTION
INPUTS
1, 2
24 vac Input
Powers TR1
3, 4
5 Not Used Not Used
6
24 vac Input
from SC30
Starts Timer no. 2
IDM2 Runs at High Speed
MGV2 Operates in High Fire
7
24 vac Input
from IGC2
Starts Timer no. 1
IDM2 Runs at High Speed
MGV2 Operates in Low Fire
Terminal 6 Input ignored during dura-
tion of Timer no. 1
OUTPUTS
8, 9 Relay Output MGV2 Operates in High Fire
10, 11 Relay Output Powers SC30
12, 14 Relay Output IDM2 Runs at High Speed
13, 14 Relay Output IDM2 Runs at Low Speed
TERMINAL TYPE OF I/O RESULT/ACTION
INPUTS
1
24 vac Input
from TR1
Powers SC30
2
7
4-20 mA Input
from SCB
Sets Output to Modulating Gas
Valve
8
OUTPUTS
3
0-20 vdc Output
Output to Modulating Gas Valve
4
5, 6 Relay Output Starts TR1 Timer no. 2
Run Status
Service Test
Temperature
Pressures
Setpoints
Inputs
Outputs
Configuration
Time Clock
Operating Modes
Alarms
Alarm Status
ENTER
MODE
ESCAPE
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