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Smoke Control Group —
ization, Evacuation, Smoke Purge, and Fire Shutdown.
PRESSURIZATION — Pressurization mode is used to pre-
vent entrance of smoke into the conditioned space in the event
of fire or other emergency condition. The pressurization func-
tion activates in response to closure of external signal contact
set. The function also initiates an alarm signal to CCN Building
Supervisor. Pressurization is Mode 34. See Table 24. The
PSIO-2 module (available as a factory-installed option or field-
installed accessory on size 034-074 units and is standard on
078-104 units) is required to initiate this control function. In
addition, the factory-installed economizer option is required.
An external signal contact set (normally open, close on
initiation of mode, 24-vac pilot duty, connect to PSIO2,
channel 37) is also required on all units.
For units equipped with Inlet Guide Vanes or Variable Fre-
quency Drive, a second contact set is required to bypass the
unit HIR function and force the room terminals to Minimum
Heating position. This contact set (SPDT, pilot duty, 115-v),
designated SW-5A/B and powered by external signal, must be
connected to the HIR terminals.
Sequence of Operation — Normally Open contact set closes
for minimum 2 seconds. The economizer opens and the HIR
energizes. The supply fan is energized (Exhaust Fan OFF). The
supply fan runs and delivers outdoor air to space (with no ex-
haust capability). Pressurization mode will be overridden by si-
multaneous closure of any of signal contacts for Evacuation,
Smoke Purge, or Fire Shutdown and system will be placed in
Fire Shutdown mode. To configure, make the field connection
at channel 37.
EVACUATION — Evacuation mode is used to remove smoke
from the occupied space in response to closure of emergency
signal contact set. Alarm is also initiated through CCN Build-
ing Supervisor. Evacuation is Mode 35. See Table 24.
The PSIO-2 module (available as a factory-installed option
or field-installed accessory on size 034-074 units and is
standard on 078-104 units) is required to initiate this control
function. In addition, the factory-installed economizer and
factory-installed power exhaust options are required.
An external signal contact set (normally open, close on initi-
ation of mode, 24-vac pilot duty) connect to PSIO2, channel 39
is also required.
Sequence of Operation — Normally Open contact set closes
for minimum 2 seconds. The economizer opens. The supply
fan is deenergized. The exhaust fan is energized. The exhaust
fan runs and extracts air from the space. Evacuation mode will
be overridden by simultaneous closure of any of signal contacts
MODE
DISPLAY CODE (MODE)
POWER EXHAUST FANS
SUPPLY-AIR FAN
ECONOMIZER DAMPER
RETURN-AIR DAMPERS
POWER EXHAUST DISCHARGE DAMPER
SUPPLY-AIR FAN IGV OR
VARIABLE FREQUENCY DRIVE
HEAT INTERLOCK RELAY BYPASS*
GAS OR ELECTRIC HEAT — ALL STAGES
HUMIDIFIER 1 AND 2
LEGEND
— Inlet Guide Vanes
IGV
*Required only if unit equipped with IGV or VFD.
This group includes Pressur-
Table 24 — Smoke Control Operating Mode Details
PRESSURIZATION
34
Off
On
Open
Close
Close
Open, Control
To Static Pressure
Set Point
On
Off
Off
for Pressurization, Smoke Purge, or Fire Shutdown and the sys-
tem will be placed in Fire Shutdown mode. To configure, make
the field-connection at channel 39.
SMOKE PURGE — Smoke Purge mode allows the system to
remove smoke from the space and fill the space with fresh air,
in response to closure of external signal contact set. Smoke
Purge is mode 36. See Table 24.
The PSIO-2 module (available as a factory-installed option
or field-installed accessory on size 034-074 units and is
standard on 078-104 units) is required to initiate this control
function. In addition, the factory-installed economizer and fac-
tory-installed power exhaust options are required.
An external signal contact set (normally open, close on initi-
ation of mode, 24-vac pilot duty) connect to PSIO2, channel 38
is also required on all units.
For units equipped with Inlet Guide Vanes or Variable Fre-
quency Drive, a second contact set is required to bypass the
unit HIR function and force the room terminals to Minimum
Heating position. This contact set (SPDT, pilot duty, 115-v),
designated SW-5A/B and powered by external signal, must be
connected to the HIR terminals.
Sequence of Operation — Normally Open contact set closes
for minimum 2 seconds. The economizer opens. The HIR is
energized. The supply fan is energized. The exhaust fan is ener-
gized. The supply fan runs and delivers outdoor air to the
space. The exhaust fans run and extract air from the space.
Evacuation mode will be overridden by simultaneous closure
of any of signal contacts for Pressurization, Evacuation, or Fire
Shutdown and the system will be placed in Fire Shutdown
mode. To configure, make the field connection at channel 38.
FIRE SHUTDOWN — Fire Shutdown mode will end all fan
and system operations and close outside air and exhaust damp-
ers, in response to closure of external signal contact set. Fire
Shutdown is Mode 37. See Table 24.
The PSIO-2 module (available as a factory-installed option
or field-installed accessory on size 034-074 units and is
standard on 078-104 units) is required to initiate this control
function.
An external signal contact set (normally open, close on initi-
ation of mode, 24-vac pilot duty) connects to PSIO2, channel
40 is also required.
Sequence of Operation — Normally Open contact set closes
for minimum 2 seconds. The economizer closes. The supply
fan is deenergized. The Exhaust Fan is OFF. To configure,
make a field connection at channel 40.
EVACUATION
35
On
Off
Open
Close
Open
Close
Off
Off
Off
24
SMOKE PURGE
FIRE SHUTDOWN
36
On
Off
On
Off
Open
Close
Close
Open
Open
Close
Open, Control
To Static Pressure
Close
Set Point
On
Off
Off
Off
Off
Off
37
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