Carrier 50EJQ Información técnica descargar pdf (Pagina 20)

Smoke Control Modes — Variable air volume units

and CV units with optional expansion I/O board will per-

form ﬁre and smoke control. The unit will provide 4 differ-

ent modes which can be used to control smoke within the

area serviced by the unit. These modes of operation are ﬁre

shutdown, pressurization, evacuation, and smoke purge.

Each mode must be energized individually via channels

5, 6, 7, and 8 on the expansion board. The corresponding

alarm will be initiated when a mode is activated. The ﬁre

system will provide a normally closed dry contact closure.

Table 43 speciﬁes all actions the control will undertake

when each mode occurs (all outputs are forced with

priority 1 — Fire).

If more than one input is energized, the control will op-

erate in Fire Shutdown mode.

Head Pressure Control — The DDC module con-

trols the condenser fans to maintain proper head pressure.

The condenser fans are conﬁgured to react to the outdoor-air

temperature. On size 024-034 units, fan no. 2 is energized at

65 F and deenergized at 55 F. On size 038-048 units fans

no. 3 and no. 4 are energized at 65 F and deenergized at

55 F. On size 054-068 units, fans no. 3 through 6 are ener-

gized at 65 F and deenergized at 55 F. The leading fan (no.

1) can also be controlled with a Motormaster® III control.

On size 038-068 units, fan no. 2 operates at full speed with

a Motormaster control on fan no. 1.

Space Temperature Sensors

ACCESSORY SPACE TEMPERATURE SENSOR (T-55) —

The T-55 (Carrier part no. CEC0121448-01) sensor is a wall-

mounted device used to measure space temperature and for

unoccupied heating and cooling operation. It should be

installed as a wall-mounted thermostat would be (in the con-

ditioned space where it will not be subjected to either a cool-

ing or heating source or direct exposure to sunlight, and 4 to

5 ft above the ﬂoor). The sensor can also be used to override

the occupancy schedule in the unit by pushing the override

button on the front of the sensor.

ACCESSORY SPACE TEMPERATURE SENSOR (T-56) —

The T-56 sensor operates the same as the standard T-55 sen-

sor but has an additional feature of allowing the user to change

the set point ±5° F from the space temperature. The T-56

sensor (Carrier Part No. CEC0121503-01) is applicable to

CV and heat pump applications only. A slide potentiometer

is used to provide the space temperature offset and is located

on the face of the device. The sensor is a wall-mounted de-

vice and should be installed as a wall-mounted thermostat

would be (in the conditioned space where it will not be sub-

jected to either a cooling or heating source or direct expo-

sure to sunlight, and 4 to 5 ft above the ﬂoor). The sensor

can also be used to override the occupancy schedule in the

unit by pushing the button on the front of the sensor.

SPACE TEMPERATURE AVERAGING — Applications that

require averaging using multiple space temperature sensors

can be satisﬁed using either 4 or 9 sensors. Only Carrier sen-

sors may be used for standard T-55 space temperature av-

eraging. Sensors must be used in multiples of 1, 4 and 9

only, with total sensor wiring not to exceed 1000 ft.

NOTE: Space temperature reset can be accomplished with

only one sensor (provided standard with unit). Do not use

T-56 sensor for space temperature averaging because the

5° F offset function will not work in a multiple sensor

application.

Table 43 — Fire/Smoke Control Modes

DEVICE PRESSURIZATION

SMOKE

PURGE

EVACUATION

FIRE

SHUTDOWN

Economizer 100% 100% 100% 0%

Indoor Fan/VFD ON ON OFF OFF

Power Exhaust

(all outputs)

OFF ON ON OFF

Heat Stages OFF OFF OFF OFF

HIR ON ON OFF OFF

LEGEND

HIR — Heat Interlock Relay

VFD — Variable Frequency Drive

CONTROL

BOX

CONTROL BOX

024-034 UNITS 038-054 UNITS 058-058 UNITS

Fig. 5 — Condenser-Fan Motor Locations

1 2 ... 15 16 17 18 19 20 21 22 23 24 25 ... 43 44

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