Table of Contents
Advertisement
building fire alarm system, and the corresponding alarm is then
generated at the HSIO keypad or building supervisor. The
4 modes are Fire Shutdown mode, Evacuation mode, Pressur-
ization mode, and Smoke Purge mode.
For Fire Shutdown mode, 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.
For Pressurization mode, 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.
For Evacuation and Smoke Purge modes, the PSIO-2 mod-
ule (available as a factory-installed option or field-installed ac-
cessory on size 034-074 units and is standard on 078-104 units)
is required to initiate this control function. In addition, the fac-
tory-installed economizer and factory-installed power exhaust
options are required.
The building fire alarm system must provide 4 normally
open contact closures (rated for 24-vac). These contacts must
be wired between TB2-6 and the PSIO2 plug J7 (bottom) ap-
propriate connection. Refer to the unit wiring diagram for the
corresponding connection point on PSIO2, plug J7 (bottom).
Heat Interlock Relay (HIR) Function Wiring
(VAV Units Only — Not necessary for DAV
applications) —
Variable-air volume units which provide
staged heating (for morning warm-up, unoccupied heat, or oc-
cupied heat modes) require that room terminals be controlled
STANDARD T-55 (CEC0121448-01)
SENSOR
T2
T1
ACCESSORY T-56* (CEC0121503-01)
SENSOR
TH
COM
SW
034-048
034-048
Fig. 14 — Space Temperature Sensor Wiring
35
to go to the Minimum Heating position when the unit goes into
the unoccupied or occupied heating mode. The HIR function is
provided for this control. When the unit goes into heating
mode, the contact set at Channel 60 (DSIO2) is energized to
provide switch closure or opening (depending on how the
field-supplied power source is set up) to open the room termi-
nals. The field-supplied connections for interlock function are:
HEAT
INTERLOCK
Sizes 034-048 —
RELAY
Normally Closed
Normally Open
NOTE: A field-supplied power source is required. See Fig. 16
and unit wiring schematic for wiring details.
Remote SASP Reset —
mote input from an energy management system (EMS) or
some other input to offset the space temperature set point on
CV applications or to reset the supply-air set point on VAV ap-
plications. A remote, isolated, 2 to 10 vdc signal may be used
to achieve this purpose. See Fig. 27 for wiring details.
Remote START/UNOCCUPIED Control —
control is for applications where it is necessary to control the
unit occupancy mode from a remote timeclock or switch. See
Fig. 18 for appropriate field wiring. When signal (24-v) is ap-
plied to Channel 49, unit will enter occupied mode. Removal
of signal returns unit to unoccupied mode. Place LOCAL/
REMOTE switch in REMOTE (ON) position.
SIZES
SIZES
054-104
TB3
TB2
1
1
3
2
SIZES
SIZES
054-104
TB3
TB2
1
1
3
2
7
7
TERMINALS
Sizes 054-104 —
TB-3
TB2
2 and 4
8 and 10
4 and 5
8 and 9
The unit controls allow for re-
LEGEND
COM
— Common
T
— Terminal
TB
— Terminal Block
Accessory
Field Wiring
*Constant volume applications only.
This
Advertisement
Table of Contents
Troubleshooting
