HomeMy WebLinkAboutscan-1323 0993 SEQUENCE OF OPERATION FOR Ell CONTROL
ALTERNATE #8
A. The air handling unit (AHU) has a constant speed supply fan, DX cooling coil with
remote air cooled condensing unit, modulating electric heat and an economizer.
B. The FMS contractor must include:
1. Provide a wall mounted thermostat that includes a local set point adjustment
and an unoccupied override button. The set point adjustor must be software
limited to a range of 70F to 75F (adj.). Program a 5F (adj.) dead band centered
on the local set point between the room heating temperature set point and the
room cooling temperature set point. The override button must initiate occupied
operation for an adjustable time period up to at least four hours. Initially
program the override period for two hours.
C. Safeties
1. Safeties must be hard wired and not depend on the operation of the EMS to
work.
2, If the building fire alarm activates, shut down the supply fan.
3, If the air temperature over any 12-inch section of the low limit temperature
thermostat serpentimed across the leaving side of the heating coil falls below
35F (adj.), the supply fan shuts off and the outside air damper closes. When an
operator presses the thermostat's manual reset, the air handler resumes
operation.
D. Alarms. Alarms must appear and buffer at the alarm reporting locations until
acknowledged.
=. If the room temperature rises more than 2F above the night setup temperature
or falls more than 2F below the night setback temperature, annunciate an
alarm.
2. If the outside air temperature is below 40F and the supply air temperature falls
below SOF (adj.), annunciate an alarm.
3. If the outside air temperature is below 40F and the supply air temperature falls
below 45F (adj.), annunciate an alarm. This is a critical alarm.
4. If the supply fan does not indicate operation after commanded on or continues
to indicate operation after commanded off, annunciate an alarm.
5. If the air filter's pressure drop exceeds 0.5 in W.C. (adj.) for more than 15
minutes, annunciate an alarm.
E, The AHU indexes between occupied and unoccupied modes.
1. The time clock indexes the AHU between occupied mode and unoccupied mode
by a time of day schedule.
2. The time of day scheduled transition from unoccupied mode to occupied mode
must be through an optimized start routine.
a. Start the AHU no sooner than 15 minutes and no further than two hours
(adj.) before scheduled occupancy.
L. The optimizer goal is to rave the room temperature within 1F of its
occupied heating set pout during cool or cold weather and within IF of its
occupied cooling set po-t during warm or hot weather.
3. The room thermostat has an override button that may be used to initiate
occupied mode.
4. The AHU indexes to unoccupied mode when the time of day schedule is in
unoccupied and the thermostat's override is off.
S. The AHU indexes to occupied mode when the thermostat's override is on.
F. If the AHU is in unoccupied mode:
1. The supply fan shuts dawn.
2. The heating section and cooling section shut dawn.
3. The outside air damper closes.
4. The return air damper opens.
S. If the temperature at the room thermostat falls below the night setback
temperature (62F adj.) or rises above the night setup temperature (84F adj.),
the AHU runs in night mode.
a. The supply fan runs.
b. The heating section and cooling section may run on demand.
c. The outside air damper remains closed.
d. The return damper remains open.
6. If the AHU is in night made and the temperature at the room thermostat is 3F
above the setbace set point and 3F below the setup set point, the AHU returns
to unoccupied Dde.
G. If the AHU is in accuu ed mode:
_. The supply fan operates:
a. If the outside air dewpoint temperature rises above 63F (adj.):
a. If the room temperature is above the room cooling temperature set
point, the supply fan runs.
b. If the room temperature is below the room heating temperature set
point, the supply fan runs.
L. If the room temperature is between the room cooling temperature set
point and the room heating temperature set point, the supply fan
stops.
L . If the outside air dewpoint temperature falls below 60F (adj.):
a. The supply fan runs continuously.
2. The eating section and the cooling section may run on demand.
3. The outside and return air dampers may modulate on command.
F. Rese' the economizer cooling mixed air temperature set point.
1. Reset the economizer cooling mixed air temperature set point as the outside air
-emperature changes.
a. The reset is done every 15 minutes.
c. When the outside air temperature is at or above 65F (adj.), the economizer
cooling mixed air temperature set point is 55F (adj.).
When the outside air temperature is at or below 60F (adj.), the economizer
cooling mixed air temperature set point is 6OF (adj.).
d. As the outside air temperature varies from 6OF to 65F, the economizer
cooling mixed air temperature set point varies linearly from 60F to 55F.
Vvhen the AHU indexes to occupied mode, stage the electric heating section,
economizer and cooling section in sequence to maintain the heating and cooling
room temperature set points.
J. When `ra AHU indexes to night mode, stage the electric heating section and cooling
sectior r,. sequence to maintain the :eating and cooling room temperature set
joints.
K. `_nable '1�e heating section, cooling section and economizer to operate on demand at
-hese o-side air temperatures.
_, V. 'en the outside air temperature is above 45F (adj.), allow the mechanical
cc. ng to operate on demand.
2, V.-en the outside air temperature Is below 70F (adj.), allow the heating section
tc -perate on demand.
3. Vr _n the outside air temperature is below 67F (adj.), allow the economizer to
or --ate on demand.
L. Disable --e heating section, cooling section and economizer from operating at these
outside - n temperatures.
1. V,en the outside air temperature is below 42F (adj.), shut off the mechanical
cc- ng.
2. V,-en the outside air temperature is above 73F (adj.), shut off the heating
se-- on,
3. W the outside air temperature is above 70F (adj.), shut off the economizer.
M. When t'- -oom temperature falls below the room hea-rg temperature set point,
operate --e heating section, if allowed to operate, to c-set the heating demand.
1. If supply fan does not indicate on, immediate / shut down the electric heat.
2. If - - room temperature falls below the room he ong temperature set point for
To than 2 minutes (adj.), start the electric heat section.
3. If t-- oom temperature rises more than 2F (ad. above the room heating
ter --nature set point for more than 2 minutes (ad).) and the heating section
has =en on at least 2 minutes (adj.), stop the electric heat section.
4. Wrr the heating section turns on, modulate the electric heat to maintain the
suit = - air temperature at 90F (adj.).
N. When tt= -com temperature rises above the room cooing temperature set point,
operate -` economizer and DX, if available, to offset t^.e coaling demand.
1. Co'---_ the outdoor and return (mixed) air dampens.
a. :hen the economizer is off:
Place the outside air damper at its minimum position (15°c adj.).
c. Position the return air damper in opposition.
L. ,Then the economizer is on:
_, If the room temperature rises above the room coaling temperature
set point, modulate the outside air damcer between its minimum
position and 100 percent open to mair-ain the mixed air temperature
at the economizer cooling mixed air ter-erature set point.
If the room temperature falls more tha- 2F (adj.) below the room
cooling temperature set point, place tr- outside air damper at its
minimum position.
- Modulate the return air damper in opFoction.
2. Control the DX cooling.
a. If the supply fan does not i -irate operation, immediately stop all cooling
stages.
U. If a compressor has a load.- aid such as hot gas bypass or a Rawal APR,
that compressor is always c. ding stage 1.
c. The DX stages up on increas rag cooling demand.
a. The DX stages up on it -,easing cooling demand.
1. If the room temperature Is above the room cooling temperature
set point for more -,:an 5 minutes (adj.) and cooling stage 1 has
been off for more --.an 5 minutes (adi start cooling stage 1.
2. If the room temperature is above the room cooling temperature
set point for more -rare 5 minutes (adj.) and cooling stage 1 has
been on for 5 minutes (adj.) and cooling stage 2 has been off for
at least 5 minutes ;adj.), start cooling stage 2.
Is. The DX stages down o.- decreasing cooling demand.
1. If the room temperature is more than 2F (adj.) below the room
cooling temperature set joint for more than 5 minutes (adj.) and
cooling stage 2 has beer on at least 5 minutes (adj.), stop
cooling stage 2.
2. If the room temperature s more than 2F (adj.) below the room
cooling temperate--e set point for more than 5 minutes (adj.) and
cooling stage 1 h-s been on at least 5 minutes (adj.) and cooling
stage 2 has beer --Ff at least 5 minutes (adj.), stop cooling stage
1.
P. Algorithms.
1. Second Order Digital Low Pass = ter. This algorithm must be implemented in a
FMS tier 2 controller.
a. Y2 = SECOND ORDER FIL'=_R OUTPUT, Y1 = FIRST ORDER FILTER
OUTPUT AND SECOND ORE ER FILTER INPUT, YO = LATEST SENSED
VARIABLE INTO FIRST ORDER FILTER, e = EPSILON (2.71828), t =
SAMPLE TIME IN SECONDS, T = TIME CONSTANT IN SECONDS
in M = eA(-t/r) (e^ is the nature antilog function) [first equation] never
allow M >= 1.0
Y1 = (YI - YO) * M + YO [seared ecoation]
d. Y2 = (Y2 - Y1) * M + Y1 [th -- egcation]
Q. Points List. The points may be in a Tier 2 coctroller, Tier 3 controller or a remote
point block controlled from a Tier 2 or rer 3-ontroller. All points listed below must
appear on each AHU dedicated graph
1. Analog Input (AI)
a. Room temperature
L. Room temperature set point
C. Supply air temperature (aver-3inc sensor) (place downstream of electric
heat)
it. Mixed air temperature
e. Outside air dry bulb temp ---ire f__abal)
f. Outside air dewpoint temperature-alculated)
g. Outside air relative humid , (glob- )
h. Air filter differential press -re
2. Analog Output (AO)
a. Mixed air damper position
L. Electric heat output
3. Digital Input (DI)
a. Low limit detection thermosta-trir
b. Fan status (current switch)
C. Unoccupied override
4. Digital Output (DO)
a. Fan On / Off
L. DX cooling stage
C. Electric heat stage
S. Linkage
a. Direct link from the dedicate- gra,--:c to the sequence of operation
section CONSTANT VOLUME z:R HA', DLER (AHLI
b. Direct link from the dedicate: gray- - to the time of day schedule.
ALTERNATE #9
A. The VAV air handling unit (AHU) has:
1. Variable speed supply fan
2. DX cooling
3. Electric heating section
4. Air side economizer
5. Remote variable speed exhaust fan on roc'
B. The AHU's factory provided controls must perforr-the important control functions.
1. Supply air discharge temperature control sing the heating section, economizer and
cooling section.
2. Sipply duct static pressure control using tie variable speed supply fan.
3. Tire facility management system (FMS) is -i interface between the user and the AHU
a-J does not perform any control functic- It is used to command the AHU on / off,
ircc; set points to the AHU controls anc--mitor selected physical and virtual points
that are in the AHU controls. The AHU -st be capable of performing the important
control functions as If the FMS were no, -'esert.
C. The unit', fans' VFDs must be programmed a, :he VFD to never run slower than 15 Hz,
regard ess of the signal from the AHU contrr. = or the command typed into the drive's user
interface,
D. Point notes.
1. If a point Is labeled (FMS), that point res Jes in ...e FMS.
2. If a point is labeled (AHU), that point re= Jes in -je AHU's factory provided controls.
3. If a point is labeled (FMS adj.), that Do rust ce adjustable from a user logged into
the FMS system or by the program our, -3 in the FMS. If the point resides in the
AHU's factory provided controls (i.e., r - rum ous de air position), the FMS must
reach to the AHU resident point throuc- -re inter ;-ion. The values stated in this
sequence are good starting points. Th= =MS cont--::or must adjust these values
our ng startup to optimize control oper-- on.
4. If a point is labeled (AHU adj.), that pc -: may be a- astable from a user using a
service tool or man to machine interfa-= :hat is cc--ected to the AHU's factory
provided controls. This kind of point rr.. also be a--essible through the FMS at the
FMS contractor's discretion. The values stated in -- = sequence are good starting
points. The FMS contractor must adi these val_-s during startup to optimize
control operation. This kind of point also be a- essible through the FMS at the
FMS contractor's discretion.
5. If a point is labeled (GRAPHIC), place -A point c- -ne AHU graphic so authorized
users may adjust (AO) or toggle (DO), -he anal-_ .aloes stated in this sequence are
good starting points. The FMS contra-ur must at- st these values during startup to
optimize control operation. If the poi-. -esides it - e AHU's factory provided controls
(i.e., set back temperature set point), --e FMS n.,7 reach to the AHU resident point
through the integration.
6. Provide supply duct static pressure se-scr (SP-i -stalled in Lockers 121.
7. Provide indoor to outdoor differential -sure s- -,or (DPTE-1).
a. Sense indoor pressure in Blacr awks
E. The AHU manufacturer must include the follov; -:
1. Provide a complete factory provided cc--rol cyst- that executes this section of the
sequence of control.
2. The factory provided control system's po, -,s cot- -e accessible for view and
adjustment by a service tool or man to ma-nine--erface connected to the control
system. The tool or Interface does not reef to -e furnished as part of this contract.
3. Provide all hardware, software and perm--ent -enses required to implement an
interface to the FMS using BACNET TCP := or B.--NET MS/TP.
a. The FMS contractor must not be re --:red t- -o more than conned a cable to
the AHU's factory controls and be a- e to c--munlcate in the required protocol
in order to implement the interface
b. The FMS contractor may be requi,-: to ma--oints across the integration.
4. Allow all AHU resident points in the sec_ence lis-=- as (FMS ad).) to be adjustable
across the integration by an operator c= .,..g the F,.S
5. Furnish a supply duct static pressure tra-smitter
6. Furnish a differential pressure transmit for to - ng pressure control.
F. The FMS contractor must include the following.
1. Install the AHU's supply duct pressure --ansmitte- The FMS contractor must provide
the wirinc Prom the instrument to the A-J.
2. Install the AHU's differential pressure - =-.smitter -,d its required air tubing. The
FMS contractor must provide the wiriF- c-em the -strument to the AHU.
a Use a .vind gust pressure attenua--such as a Dwyer A-306 for the outside air
pressrre pickup.
b. Place --a wind gust pressure affe* _tor at -= top of a 10-foot-long 3/4" EMT
that is attached to the side of AHC
3. Provide a supcly temperature sensor.
4. Provide a current activated status swiss- -or the s_dply fan.
5. Provide a cu,-ent activated status switc 'or each--essure relief fan.
6. Provide a cucent activated status switc- `cr each-ompressor.
7. Provide a su;oly air filter differential pr=sure tra-smitter for the AHU.
S. Provide a menial reset high pressure scary. Plat- to sense supply pressure at the
supply dud-onneccon to the AHU. Plc-e the safe-, control in the AHU.
9. Provide a manual reset low pressure sfaty. Place -c sense return pressure at the
return duct connection to the AHU. P a-e the safe-, control In the AHU.
10. The FMS must close the AHU outside a � damper v.-en commanding the AHU on in
m;ght. Tb s may be done through the i--egration. the outside air damper cannot
be closed through the integration, the F+1S contractor must provide a hard wired
relay that is field installed and functions -a keep the outside air damper completely
closed a o the return air damper cori open ;rren turned on.
G. AHU Protection Functions
1. Safeties
a. Safeties must be hard wired and not depend on the operation of the FMS to
work.
b. If the static pressure in the supply dud (PS-1) rises above 4.0 in W.C. (locally
adj.), immediately shut down the supply and return fans.
c. If the static pressure in the return duct (PS-2) falls below -2.0 in W.C. (locally
adj.), immediately shut down the supply and return fans.
2. Alarms
a. Alarms must appear and buffer at the alarm reporting locations until
acknowledged.
b. If a pressure safety trips, annunciate an alarm.
c. If the supply air temperature falls below 40F, annunciate an alarm.
d. If the supply air temperature falls below 30F, annunciate a critical alarm.
e. If the supply fan does not indicate operation after the FMS commands the AHU
on or continues to indicate operation after commanded off, annunciate an
alarm.
f. If the air filter's pressure drop is above 0.3 in W.C. for more than 15 minutes,
annunciate an alarm.
H. AHU On / Off Functions
1. The FMS commands the AHU and EF to OCCUPIED MODE or UNOCCUPIED MODE
(FMS command).
a. The FMS time clock indexes the AHU and EF between OCCUPIED MODE and
UNOCCUPIED MODE in response to a time of day schedule.
A. The time clock transition from UNOCCUPIED MODE to OCCUPIED MODE
must be through an optimized start routine.
B. Index the AHU and EF from off to on no sooner than 15 minutes and no
further than two hours before scheduled occupancy.
C. The optimizer goal is to have the room temperature within 1F of its
occupied heating set point during cool or cold weather and within 1F of its
occupied cooling set point during warm or hot weather.
b. If the AHU and EF are indexed to UNOCCUPIED MODE and a user presses a
thermostat's override button, index the AHU and EF to OCCUPIED MODE until
the override duration expires.
c. If the temperature at the rooms' thermostats are below the setback
temperature set point or is above the setup temperature set point, index the
unit to OCCUPIED MODE.
it. If the time of day schedule indicates off, all override durations are expired, all
rooms' temperatures are above setback temperature set point and all room
temperatures are below the setup temperature set point, index the unit to OFF.
2. If the FMS commands the AHU to UNOCCUPIED MODE:
a. The supply fan stops.
b. The exhaust fan ramps down to UNOCCUPIED MODE setpoint (half the airflow
CFM or 30 Hz).
c. The compressors modulate.
d. The electric heat modulates.
e. The outside air damper modulates.
f. The return damper modulates.
3. If the FMS commands the AHU to OCCUPIED MODE, or the AHU returns from a
power failure:
a. The supply fan ramps up to maintain -0.05" W.C. (adj.) in Blackhawks 142.
b. The exhaust fan ramps up to OCCUPIED MODE setpoint (full airflow CFM or 60
Hz).
c. The exhaust isolation damper opens.
d. The supply fan may modulate.
e. The compressors may stage and modulate.
f. The electric heat may stage and modulate.
g. The outside and return air dampers may modulate.
I. The FMS commands the Al discharge temperature set point.
1. Adjust the discharge temperature set point as the outside air temperature changes,
2. The adjustment is done every 15 minutes.
3, If the outside air temperature is at or above 65F (FMS adj.), the discharge
temperature set point is 55F (FMS adj.).
4. If the outside air temperature is at or below 60F (FMS adj.), the discharge
temperature set point is 60F (FMS adj.).
5. As the outside air temperature varies from 60F to 65F, the discharge temperature set
point varies linearly from 60F to SSF.
J. The FMS enables the economizer to operate on demand if the outside air temperature is
below 67F (FMS adj.).
K. The FMS disables the economizer from operating if the outside air temperature is above 69F
(FMS adj.).
L. The AHU controls enable the heating section and cooling section to operate on demand at
these outside air temperatures.
1. If the outside air temperature is above 45F (AHU adj.), allow the mechanical coo'' -5
to operate on demand for cooling or dehumidification.
2. If the outside air temperature is below 60F (AHU adj.), allow the heating sectic- to
operate on demand.
M. The AHU controls disable the heating section and cooling section from operating at these
outside air temperatures.
1. If the outside air temperature is 2F below the mechanical cooling lockout
temperature, shut off the mechanical cooling.
2. If the or.tside air temperature is 2F above the electric heating lockout temperature,
shut off -he heating section.
N. The AHU cont,-,s operate the outdoor and return (mixed) air dampers.
1. If the economizer is off:
a. Place the outside air damper at its minimum position.
L. Position the return air damper in opposition.
2. If the =_mnomizer is on:
a Modulate the outside air damper between its minimum posit-: and 100 percent
ocen in response to the AHU control si stem's positioning de -sand.
b. Modulate the return air damper in opposition.
0. The AHU cor--ols stage or modulate the compressor(s) to maintain the-ischarge
temperature at set point.
P. The AHU cor-ols modulate the electric heat to maintain the discharge -emperature at set
point.
Q. The AHU ccrtrols modulate the supply fan to maintain the supply star _ pressure at 1.0 it
W.C. (FMS adi. GRAPHIC)
R. The AHU controls operate the building pressure control.
1. Modulate the supply and exhaust fans speed to maintain -0.05 W.C. (adj.) in
Blackhawks 142.
S. Exhaust Fan Control
1. Modulate the supply and exhaust fan speeds as noted above 'Dr building press,
control.
T. Points List.
1. A points in the AHU control system listed here (AHU) must be available for
communication to the FMS through the integration, except tre ones listed as "if
available through integration". Those points must only be communicated to the F'IS
if they are standard points implemented by the AHU manufacturer's integration. vie
are not requiring the creation of a custom integration or the addition of hard wi
points for these points if they are not available in the standa'd integration.
2. All points listed below must appear on the AHU dedicated o-aphic.
3. All points in the sequence listed as (FMS adj. GRAPHIC) mug appear on the
dedicated graphic, even if not listed below.
4. Analog Input (AI)
a. Discharge air temperature
b. Return air temperature
c. Outside air temperature
it. Supply duct static pressure
e. Smoothed building inside -outside differential pressure
5. Analog Output (AO)
a. Outside air damper minimum position
L. Supply fan speed
c. Exhaust fan speed
6. Digital Input (DI)
a. Supply fan status
b. Pressure relief fan status
c. Supply fan VFD alarm
it. Exhaust fan status
7. Digital Output (DO)
a. AHU OCCUPIED MODE / UNOCCUPIED MODE
b. Economizer Enable / Disable
c. AHU outside air damper Auto / Closed
S. Linkage
a. Direct link from the dedicated graphic to the sequence of operation section =/
AHU.
b. Direct link from the dedicated graphic to t'e time of day schedule.
NOTE:
VERIFY BUILDING DIMENSIONS FOR ROUGH -IN
WORK WITH ARCHITECTS DRAWINGS.
INVISION
PLANNING I ARCHITECTURE I INTERIORS
501 Sycamore Street
Suite 101
Waterloo, IA 50703
319.233.8419
319.233.9772 Fax
www.invisionarch.com
CONSULTANT:
n►mvuu�
WATERLOO. DES MOINES IOWA CITY
REVISIONS:
Description Date No.
OWNER SIGN -OFF:
DATE NAME
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PROJECT NO:
19053
DATE:
2019.08.06
SHEET SET:
BID DOCUMENTS
SHEET NAME:
MECHANICAL
SEQUENCE OF
OPERATION
SHEET:
ME2001
19-068 YOUNG ARENA MECHANICAL UPGRADES