Specifications

ManualsBrandsCarrier ManualsFan50JB034

e. Conﬁgure High Reference. Scroll down to IRH. De-

fault is 2000 ppm. Range is 0 to 5000 ppm.

IAQ Algorithms

IQMP = ECON + 100 x IAQG x (Demand)/IAQS

Where:

ECON = Current position of economizer damper

(Demand) = IAQS - IAQ

NOTE: IQMP will not be recalculated until (Demand) ex-

ceeds 3% of IAQS.

IAQ (Pre-Occupancy) PURGE — If outdoor air conditions

permit, IAQ Pre-Occupancy Purge will open economizer and

energize supply fan 2 hours before next Occupied period, to

provide complete exchange of indoor air with fresh air.

Duration of purge mode is user-conﬁgured (typically 5 min-

utes). The IAQ Purge is Mode 28. See Table 25. The factory-

installed economizer option is required.

Sequence of Operation — The IAQ Purge will operate only

if the following conditions exist:

• Current Time and next Occupied Time are valid.

• Purge option is enabled.

• Unit is in Unoccupied state.

• Time is within 2 hours of next Occupied period.

• Time is within Purge Duration.

• Outside-Air Temperature reading is available.

If IAQ Purge is permitted, then IAQ Pre-Occupancy Purge

is enabled. The supply fan and Heat Interlock Relays are en-

ergized. The economizer minimum position is set to PURGEMP.

The economizer opens to PURGEMP. The purge continues

until Purge Duration expires or Occupied period begins.

NOTE: IAQ Purge is limited to one per Unoccupied period.

If PURGEMP = 0% then IAQ Purge is not enabled.

Conﬁguration — See Table 27. To conﬁgure:

1. Enable Purge option. Press to enter the sub-

function. Scroll down to PURG. Set to 1 to Enable. (Set

to 0 to disable.)

NOTE: The following user-conﬁgured options require use

of Service Tool or CCN Building Supervisor to change.

2. Select Purge Duration period. Change IQPD set point. De-

fault is 5 minutes. Range is 5 to 60 minutes.

3. Select Low Temperature Minimum Position. Change LTMP

set point. Default is 10%. Range is 0 to 100%.

4. Select High Temperature Minimum Position. Change HTMP

set point. Default is 35%. Range is 0 to 100%.

OUTDOORAIR CONTROL (OAC) — The Outdoor Air Con-

trol function will maintain a minimum quantity of outdoor

airﬂow into an occupied space, regardless of space comfort

load conditions. The OAC is permitted only during Occu-

pied periods. Occupied Cooling (including Economizer Cool-

ing) and Occupied Heating are permitted during OAC and

will function normally, except when OAC mode is active,

then OAC mode may dictate a more open economizer po-

sition. See Table 28. The factory-installed economizer op-

tion and factory-installed control options module (PSIO-2)

are required.

An OAC Accessory package (consists of velocity sensor

and pressure transducer) (P/N 50DJ-900---791) is required.

Table 26 — Conﬁguring Indoor Air Quality (IAQ)

DESCRIPTION HOW TO CONFIGURE AT HISO SET POINT RANGE

Enable by selecting VENT option

VENT

1 = Use IAO only

3 = Use IAQ and OAC

Select IAQ Priority

LEVEL

1 = High

2 = Medium (Space Comfort Overrides)

3 = Low (Alert only)

Select IAQ Set Point

IAQS 1 to 5000 ppm

Specify IAQ Max Damper Position

IQMX 0 to 100%

Table 27 — Conﬁguring IAQ (Pre-Occupancy) Purge

DESCRIPTION HOW TO CONFIGURE AT HSIO SET POINT RANGE

Enable Purge

PURG Enable = 1; Disable = 0

LEGEND

IAQ — Indoor Air Quality

IAQS — IAQ Set Point

IRH — IAQ Sensor High Reference

IRL — IAQ Sensor Low Reference

IVH — IAQ Sensor High Voltage Point

IVL — IAQ Sensor Low Voltage Point

NOTE: Voltage range is 0 to 10.

Fig. 13 — Sensor Use Example