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