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Controls, Start-Up, Operation, Service and ... - Climayoreo

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If all of the above conditions are met, the following logic is<br />

used:<br />

If OAT IQ.L.O <strong>and</strong> OAT OCSP <strong>and</strong> economizer is<br />

available then purge will be enabled <strong>and</strong> the economizer will<br />

be comm<strong>and</strong>ed to 100%.<br />

Else, if OAT < IQ.L.O then the economizer will be positioned<br />

to the IAQ Purge LO Temp Min Pos (Configuration<br />

IAQIAQ.PIQ.P.L)<br />

If neither of the above are true then the dampers will be<br />

positioned to the IAQ Purge HI Temp Min Pos (Configuration<br />

IAQIAQ.PIQ.P.H)<br />

If this mode is enabled the indoor fan <strong>and</strong> heat interlock<br />

relay (VAV) will be energized.<br />

IAQ Purge (ConfigurationIAQIAQ.PIQ.PG) — This<br />

is used to enable IAQ pre-occupancy purge.<br />

IAQ Purge Duration (ConfigurationIAQIAQ.P<br />

IQ.P.T) — This is the maximum amount of time that a purge<br />

can occur.<br />

IAQ Purge Lo Temp Min Pos (ConfigurationIAQ<br />

IAQ.PIQ.P.L) — This is used to configure a low limit for<br />

damper position to be used during the purge mode.<br />

IAQ Purge Hi Temp Min Pos (ConfigurationIAQ<br />

IAQ.PIQ.P.H) — This is used to configure a maximum position<br />

for the dampers to be used during the purge cycle.<br />

IAQ Purge OAT Lockout Temp (ConfigurationIAQ<br />

IAQ.PIQ.L.O) — Nighttime lockout temperature below<br />

which the purge cycle will be disabled.<br />

OPTIONAL AIRFLOW STATION — The ComfortLink<br />

controls are capable of working with a factory-installed optional<br />

airflow station that measures the amount of outdoor air entering<br />

the economizer. This flow station is intended to measure<br />

ventilation airflows <strong>and</strong> has a limitation as to the maximum<br />

flow rate it can measure. The limits are 18,000 cfm for sizes<br />

030-050 <strong>and</strong> 31,000 cfm for sizes 055-100.<br />

All configurations for the outdoor airflow station can be<br />

found in the ConfigurationECONCFM.C, sub-menu.<br />

For this algorithm to function, the Outdoor Air Cfm Sensor<br />

Configuration (OCF.S.) must be enabled.<br />

There are three set point configurations:<br />

O.C.MN — Econ OACFM DCV Min Flow<br />

O.C.MX — Econ OACFM DCV Max Flow<br />

O.C.DB — Econ OACFM MinPos Deadbd<br />

When the outdoor air cfm sensor is enabled, the Economizer<br />

Min.Position (ConfigurationIAQDCV.CEC.MN) <strong>and</strong><br />

the IAQ Dem<strong>and</strong> Vent Min.Pos (ConfigurationIAQ<br />

DCV.CIAQ.M) will no longer be used. During vent periods,<br />

the control will modulate the damper to maintain the outdoor<br />

air intake quantity between O.C.MX <strong>and</strong> O.C.MN. The indoor<br />

air quality algorithm will vary the cfm between these two<br />

values depending on ConfigurationIAQAQ.SPDAQ.L<br />

<strong>and</strong> the ConfigurationIAQAQ.SPDAQ.H set points<br />

<strong>and</strong> upon the relationship between the IAQ <strong>and</strong> the outdoor air<br />

quality (OAQ).<br />

The economizer’s OA CFM Minimum Position Deadb<strong>and</strong><br />

(O.C.DB) is the deadb<strong>and</strong> range around the outdoor cfm<br />

control point at where the damper control will stop, indicating<br />

the control point has been reached. See the Economizer section<br />

for more information.<br />

Humidification — The P Series ComfortLink controls<br />

can control a field-supplied <strong>and</strong> installed humidifier device.<br />

The ComfortLink controls provide two types of humidification<br />

control: A discrete stage control (via a relay contact) <strong>and</strong> a proportional<br />

control type (communicating to a LEN actuator). The<br />

78<br />

discrete stage control is used to control a single-stage humidifier,<br />

(typically a spray pump). The proportional control type is<br />

typically used to control a proportional steam valve serving a<br />

steam grid humidifier.<br />

The ComfortLink controls must be equipped with a controls<br />

expansion module <strong>and</strong> an accessory space or return air relative<br />

humidity sensor.<br />

If a humidifier using a proportional steam valve is selected,<br />

the Carrier actuator (Carrier Part No. HF23BJ050) must be<br />

adapted to the humidifier manufacturer’s steam valve. Contact<br />

Belimo Aircontrols for information on actuator linkage adapter<br />

packages required to mount the actuator on the specific br<strong>and</strong><br />

<strong>and</strong> type of steam valve mounted by the humidifier<br />

manufacturer.<br />

The actuator address must be programmed into the ComfortLink<br />

unit’s humidifier actuator serial number variables.<br />

SETTING UP THE SYSTEM — These humidity configuration<br />

are located in the local displays under Configuration<br />

HUMD. See Table 58. Related points are shown in Table 59.<br />

Humidifier Control Configuration (HM.CF) — The humidifier<br />

control can be set to the following configurations:<br />

• HM.CF = 0 — No humidity control.<br />

• HM.CF = 1 — Discrete control based on space relative<br />

humidity.<br />

• HM.CF = 2 — Discrete control based on return air relative<br />

humidity.<br />

• HM.CF = 3 — Analog control based on space relative<br />

humidity.<br />

• HM.CF = 4 — Analog control based on return air relative<br />

humidity.<br />

Humidity Control Set Point (HM.SP) — The humidity control<br />

set point has a range of 0 to 100%.<br />

Humidifier PID Run Rate (HM.TM) — This is the PID run<br />

time rate.<br />

Humidifier Proportional Gain (HM.P) — This configuration<br />

is the PID Proportional Gain.<br />

Humidifier Integral Gain (HM.I) — This configuration is the<br />

PID Integral Gain.<br />

Humidifier Derivative Gain (HM.D) — This configuration is<br />

the PID Derivative Gain.<br />

OPERATION — For operation, PID control will be utilized.<br />

The process will run at the rate defined by the Configuration<br />

HUMDH.PIDHM.TM. The first part of humidity<br />

control tests the humidity control configuration <strong>and</strong> will turn<br />

on corresponding configurations to read space or return air relative<br />

humidity. If the supply fan has been ON for 30 seconds<br />

<strong>and</strong> the space is occupied, then the humidification is started.<br />

Actuator Control — Control is performed with a generic PID<br />

loop where:<br />

Error = HM.SP – humidity sensor value (SP.RH or RA.RH,<br />

depending on configuration).<br />

The PID terms are calculated as follows:<br />

P = K * HM.P * error<br />

I = K * HM.I * error + “I” last time through<br />

D = K * HM.D * (error – error last time through)<br />

Where K = HM.TM/60 to normalize the effect of changing the<br />

run time rate<br />

Relay Output Control — If the humidity sensor reading is<br />

greater than the humidity set point then the humidity relay<br />

(OutputsGEN.OHUM.R) is closed. The relay will open<br />

when the humidity is 2% less than the humidity set point.

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