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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Building Pressure Sensor (BP.S) — This configuration allows<br />
the reading of a building pressure sensor when enabled.<br />
This is automatically enabled when BP.CF = 2, 3, 4 or 5.<br />
Building Pressure (+/–) Range (BP.R) — This configuration<br />
establishes the range in in. wg that a 4 to 20 mA sensor will be<br />
scaled to. The control only allows sensors that measure both<br />
positive <strong>and</strong> negative pressure.<br />
Building Pressure SETP (BP.SP) — This set point is the<br />
building pressure control set point. If the unit is configured for<br />
a type of modulating building pressure control, then this is the<br />
set point that the control will control to.<br />
BP Setpoint Offset (BP.SO) — For building pressure configurations<br />
BP.CF=2, 3, <strong>and</strong> 4, this is the offset below the building<br />
pressure set point that the building pressure must fall below to<br />
turn off power exhaust control.<br />
Power Exhaust on Setp.1 (BP.P1) — When configured for<br />
building pressure control type BP.CF = 1 (constant volume<br />
two-stage control), the control will turn on the first power<br />
exhaust fan when the economizer’s position exceeds this set<br />
point.<br />
Power Exhaust on Setp.2 (BP.P2) — When configured for<br />
building pressure control type BP.CF = 1 (constant volume<br />
two-stage control), the control will turn on the second power<br />
exhaust fan when the economizer’s position exceeds this set<br />
point.<br />
VFD/Act. Fire Speed/Pos (BP.FS) — For BP.CF = 2, 3, 4,<br />
<strong>and</strong> 5, this configuration is the VFD speed position override<br />
when the control is in the purge <strong>and</strong> evacuation smoke control<br />
modes.<br />
VFD/Act. Min Speed/Pos (BP.MN) — For BP.CF = 2, 3, 4,<br />
<strong>and</strong> 5, this configuration is the minimum VFD speed/actuator<br />
position during building pressure control.<br />
VFD Maximum Speed/Pos (BP.MX) — For BP.CF = 3 <strong>and</strong><br />
5, this configuration is the maximum VFD speed during building<br />
pressure control.<br />
BP 1 Actuator Max Pos. (BP.1M) — For BP.CF = 2, this<br />
configuration is the maximum actuator no. 1 position during<br />
building pressure control.<br />
BP 2 Actuator Max Pos. (BP.2M) — For BP.CF = 2, this<br />
configuration is the maximum actuator no. 2 position during<br />
building pressure control.<br />
BP Hi Cap VFD Clamp Val. (BP.CL) — For BP.CF = 4, this<br />
configuration is a limit which creates a deadb<strong>and</strong> which controls<br />
the action of the second power exhaust relay.<br />
Fan Track Learn Enable (FT.CF) — For BP.CF = 5, this<br />
return/exhaust control configuration selects whether the fan<br />
tracking algorithm will make corrections over time <strong>and</strong> add a<br />
learned offset to FT.ST. If this configuration is set to No, the<br />
unit will try to control the delta cfm value between the supply<br />
<strong>and</strong> return VFDs only based on FT.ST.<br />
Fan Track Learn Rate (FT.TM) — For BP.CF = 5, this return/<br />
exhaust control configuration is a timer that affects corrections<br />
to the delta cfm operation. The smaller this value, the more often<br />
corrections may be made based on building pressure error.<br />
This configuration is only valid when FT.CF = Yes.<br />
Fan Track Initial DCFM (FT.ST) — For BP.CF = 5, this<br />
return/exhaust control configuration is the start point upon<br />
which corrections (offset) are made over time when FT.CF =<br />
Yes. It is the constant control point for delta cfm control when<br />
FT.CF = No.<br />
Fan Track Max Clamp (FT.MX) — For BP.CF = 5, this<br />
return/exhaust control configuration is the maximum positive<br />
delta cfm control value allowed unless outdoor air cfm control<br />
is available <strong>and</strong> then the delta cfm control value would<br />
be clamped to the outdoor air cfm value directly (see the<br />
Economizer section for a description of outdoor air cfm<br />
configuration).<br />
72<br />
Fan Track Max Correction (FT.AD) — For BP.CF = 5, this<br />
return/exhaust control configuration is the maximum correction<br />
allowed every time a correction is made based on FT.TM.<br />
This configuration is only valid when FT.CF = Yes.<br />
Fan Track Internal EEPROM (FT.OF) — For BP.CF = 5,<br />
this return/exhaust control internal EEPROM value is a learned<br />
correction that is stored in non-volatile RAM <strong>and</strong> adds to the<br />
offset when FT.CF = Yes. This value is stored once per day<br />
after the first correction. This configuration is only valid when<br />
FT.CF = Yes.<br />
Fan Track Internal Ram (FT.RM) — For BP.CF = 5, this<br />
return/exhaust control internal value is not a configuration but a<br />
run time correction that adds to the offset throughout the day<br />
when FT.CF = Yes. This value is only valid when FT.CF =<br />
Yes.<br />
Fan Track Reset Internal (FT.RS) — This option is a one<br />
time reset of the internal RAM <strong>and</strong> internal EEPROM stored<br />
offsets. If the system is not set up correctly <strong>and</strong> the offsets are<br />
incorrect, this learned value can be reset.<br />
Supply Air Cfm Config (SCF.C) — For BP.CF = 5, this configuration<br />
is set at the factory depending on whether an air foil<br />
or forward curve supply air fan is being used. This information<br />
is then used by the control to determine the correct cfm tables<br />
to be used when measuring supply air cfm.<br />
Building Pressure Run Rate (BP.TM) — For BP.CF = 2,3,4,<br />
<strong>and</strong> 5, this configuration is the PID run time rate.<br />
Building Pressure Proportional Gain (BP.P) — For BP.CF =<br />
2,3,4, <strong>and</strong> 5, this configuration is the PID Proportional Gain.<br />
Building Pressure Integral Gain (BP.I) — For BP.CF =<br />
2,3,4, <strong>and</strong> 5, this configuration is the PID Integral Gain.<br />
Building Pressure Derivative Gain (BP.D) — For BP.CF =<br />
2,3,4, <strong>and</strong> 5, this configuration is the PID Derivative Gain.<br />
BUILDING PRESSURE CONTROL OPERATION<br />
ConfigurationBPBP.CF = 1 (Constant Volume 2-Stage<br />
Control) — Two exhaust fan relays will be turned on <strong>and</strong> off<br />
based on economizer position to maintain building pressure<br />
control. The two trip set points are Configuration<br />
BPBP.P1 <strong>and</strong> ConfigurationBPBP.P2. If the economizer<br />
position is greater than or equal to BP.P1, then power exhaust<br />
relay 1 is energized, turning on the first stage. A 60-second timer<br />
is initialized. If the economizer falls 5% below the BP.P1,<br />
then the power exhaust fan relay is turned off. If the economizer<br />
position is less than BP.P1 <strong>and</strong> the 60-second timer has expired,<br />
the power exhaust fan relay is turned off. The same logic applies<br />
to the second power exhaust fan relay, except the BP.P2 trip<br />
point is monitored. If the economizer position is greater than or<br />
equal to BP.P2, then power exhaust relay 2 is energized, turning<br />
on the second stage. A 60-second timer is initialized. If the<br />
economizer is 5% below the BP.P2 the second power exhaust<br />
fan relay is turned off. If the economizer is less than BP.P2 <strong>and</strong><br />
the 60-second timer has expired, the power exhaust fan relay is<br />
turned off.<br />
ConfigurationBPBP.CF = 2 (Modulating Power Exhaust)<br />
— Control is accomplished with two LEN communicating actuators<br />
in t<strong>and</strong>em <strong>and</strong> one exhaust fan relay. If building pressure<br />
(PressuresAIR.PBP) rises above the building pressure<br />
set point (BP.SP) <strong>and</strong> the supply fan is on, building pressure<br />
control is initialized. Thereafter, if the supply fan relay<br />
goes off or if the building pressure drops below the BP.SP minus<br />
the building pressure set point offset (BP.SO) for 5 continuous<br />
minutes, building pressure control will be stopped. Any<br />
time building pressure control becomes active, the exhaust fan<br />
relay turns on, starting the dual exhaust fan motors. After the<br />
exhaust fan relay turns on, control is performed with a PID<br />
loop where:<br />
Error = BP – BP.SP<br />
K = 1000 * BP.TM / 60 (normalize the PID control for run rate)