1. North Chem
Pump Plug
B2 Chem
B2 Chem
South Chem
Pump Plug
B1 Chem
B1 Chem
Power Supply
120 VAC
RP R4A cct
13
PL-5 PL-6
D1 D3
8104 612
H A
O
B1 Chem
H-O-A
B1 Chem
Pump
CR-5
D2 D4
Neutral
H A
O
B1
Blowdown
H-O-A
B1
Blowdown
CR-6
PL-7
H A
O
B2 Chem
H-O-A
B2 Chem
Pump
CR-7
PL-8
H A
O
B2
Blowdown
H-O-A
B2
Blowdown
CR-8
P27
Starter
Aux
P28
Starter
Aux
P29
Starter
Aux
P30
Starter
Aux
P27
Status
CR-1
P28
Status
CR-2
P29
Status
CR-3
P30
Status
CR-4
CN
N
H
24 VAC from
Xfmr Panel
(Siemens dwg
118)
24H 24N 13
CHEM
PUMP
Legend
Existing wires & devices shown in
solid lines & black text
New wiring & devices shown in
dashed lines & blue text
White wires shown in grey
Relay coil
Status light
Terminal (labelled “T”)T
22 AWG
twisted pair
DATE CREATED
2016-01-21
CREATED BY
Andrew Snider, Intelliton
DATE REVISED REVISED BY
DWG TITLE
Boiler Water Treatment Control
DWG NO.
BLR-CHEMCTL
SITE
First Canadian Centre, 350 7th
Avenue SW, Calgary, AB
REVISION HISTORY
# DATE BY DESCRIPTION
1 2016-01-21 Andrew Snider, Intelliton As-built
B2CH
HAND
B1CH
AUTO
B1B
AUTO
B2CH
AUTO
B2B
AUTO
B1CH
HAND
B1B
HAND
B2B
HAND
B2
BDN
24N
B1CHEM
5.0.4.1
B1BDN
5.0.4.2
B2CHEM
5.0.4.3
B2BDN
5.0.4.4
NewBASOutputs
P27S
5.0.3.13
+
-
P28S
5.0.3.14
+
-
P29S
5.0.3.15
+
-
P30S
5.0.3.16
+
-
NewBASInputs
B1
BDN
CHEM
PUMPN
Boiler Feedwater
Pump Control
Panel
At Deaerator
“CP-J”
South of “Chemical
Treatment” Panel
“FCC NODE 5”
South of “CP-J”
“Boiler Water Treatment Control”
Boiler Room West Wall Near Chemical Batch Tanks
120
VAC
120
VAC
120
VAC
120
VAC
16 AWG
TEW
N
H
N
H
SV-1
B1 Blowdown
Solenoid Valve
SV-2
B2 Blowdown
Solenoid Valve
CR-5
CR-6
CR-8
CR-7

2. DATE CREATED
2016-01-21
CREATED BY
Andrew Snider, Intelliton
DATE REVISED REVISED BY
DWG TITLE
Boiler Water Treatment Control BOM
DWG NO.
BLR-CHEMCTL BOM
SITE
First Canadian Centre, 350 7th
Avenue SW, Calgary, AB
REVISION HISTORY
# DATE BY DESCRIPTION
1 2016-01-21 Andrew Snider, Intelliton As-built
Control Device Service Qty Model Mfr Document Number Description
CR-1, CR-2, CR-3, CR-4 Feedwater pump status relays 4 NBA200 120FL CARLO GAVAZZI Power Relays Type NA/NF/NP/NB Monostable 120 VAC coil, DPST, 25 A
CR-5, CR-6, CR-7, CR-8 Boiler chemical pump & blowdown valve control relays 4 NBA200 24FL CARLO GAVAZZI Power Relays Type NA/NF/NP/NB Monostable 24 VAC coil, DPST, 25 A
PL-5, PL-6, PL-7, PL-8 Boiler chemical pump & blowdown valve pilot lights 4 LEDTEC-Red-024 Techna LEDtec LED Indicators 24 VAC, 12 mA / 0.288 W, red
SV-1, SV-2 Boiler blowdown solenoid valves 2 8220G409 ASCO 2/2 SERIES Hot Water / Steam 120 VAC, 10.1 W, 19 mm (3/4") pipe, Cv 8.8
Blowdown Control
1. Each boiler's automated blowdown solenoid valve (B1BDN & B2BDN) is in series with a continuous blowdown valve ("CBD") which is manually set by the operator. The CBD is used to regulate the blowdown flow rate when the automated blowdown solenoid valve is open. It is
recommended to leave both CBDs at the same setting & use the operator-entered blowdown runtime multipliers (B1BDNTM & B2BDNTM) to adjust the amount of time that the automated blowdown solenoid valves open, as described below.
4. Operator control of each boiler's blowdown runtime is effected by adjusting its operator-entered blowdown runtime multiplier (B1BDNTM & B2BDNTM), which works as follows.
Each boiler's blowdown runtime setpoint (B1BDNTS & B2BDNTS, minutes) is calculated at the beginning of each sampling interval based on its feedwater pump runtime during the preceding sampling interval (B1FPSINTT & B2FPSINTT, minutes) & its operator-entered blowdown runtime
multiplier (B1BDNTM & B2BDNTM):
B?BDNTS = B?BDNTM * B?FPSINTT
Example: if boiler 1 feedwater pump ran for 3 minutes (B1FPSINTT) & the boiler 1 blowdown runtime multiplier (B1BDNTM) is set at 1.5, then the boiler 1 blowdown runtime setpoint (B1BDNTS) = 1.5 * 3 = 4.5 minutes.
2. Throughout each sampling interval, each boiler's blowdown solenoid runtime is tracked via its blowdown solenoid timer (B1BDNT & B2BDNT, minutes).
3. Each boiler's blowdown solenoid valve (B1BDN & B2BDN) is commanded on (open), if the boiler's burner is proven on (B?BS = on), until the blowdown runtime (B1BDNT & B2BDNT, minutes) reaches the blowdown runtime setpoint (B1BDNTS & B2BDNTS).
4. The total runtime of each boiler's two feedwater pumps is tracked during each sampling interval.
Feedwater Pump Status Points:
Boiler 1: P27S, P29S
Boiler 2: P28S, P30S
At the beginning of each sampling interval, each boiler's feedwater pump runtime total from the preceding interval is written to the boiler feedwater pump interval runtime (B1FPSINTT & B2FPSINTT, minutes) & the runtime total is reset to 0 minutes.
5. For operator information only.
At the beginning of each interval, each boiler's average burner output for the preceding sampling interval is written to its burner output average point (B1BOPA & B2BOPA, %).
At the beginning of each sampling interval & immediately before the interval timer (BLRCHT) is reset to 0 minutes, the following calculations are made:
Boiler ? feedwater pump runtime as a percentage of interval time: B?FPSTP = 100 * (B?FPSINTT / BLRCHT)
Boiler ? feedwater pumping rate (ratio of feedwater pump runtime percentage to average burner output): B?FRATE = 100 * B?FPSTP / B?BOPA
Chemical Pump Control
1. Each boiler's automated chemical injection pump (B1CHEM & B2CHEM) has a speed setting & a volume setting which are manually set by the operator. The speed & volume settings are used to regulate the rate of chemical injection when the chemical injection pump is running. It is
recommended to leave both chemical injection pumps at the same speed & volume settings & use the operator-entered chemical injection pump runtime multipliers (B1CHEMTM & B2CHEMTM) to adjust the amount of time that the chemical injection pumps run, as described below.
4. Operator control of each boiler's chemical injection pump runtime is effected by adjusting its operator-entered chemical injection pump runtime multiplier (B1CHEMTM & B2CHEMTM), which works as follows.
Each boiler's chemical injection pump runtime setpoint (B1CHEMTS & B2CHEMTS, minutes) is calculated at the beginning of each sampling interval based on its feedwater pump runtime during the preceding sampling interval (B1FPSINTT & B2FPSINTT, minutes) & its operator-entered
chemical injection pump runtime multiplier (B1CHEMTM & B2CHEMTM):
B?CHEMTS = B?CHEMTM * B?FPSINTT
Example: if boiler 1 feedwater pump ran for 3 minutes (B1FPSINTT) & the boiler 1 chemical injection pump runtime multiplier (B1CHEMTM) is set at 2, then the boiler 1 chemical injection pump runtime setpoint (B1CHEMTS) = 2 * 3 = 6 minutes.
2. Throughout each sampling interval, each boiler's chemical injection pump runtime is tracked via its chemical injection pump timer (B1CHEMT & B2CHEMT, minutes).
3. Each boiler's chemical injection pump (B1CHEM & B2CHEM) is commanded on until its chemical injection pump runtime (B1CHEMT & B2CHEMT, minutes) reaches the calculated chemical injection pump runtime setpoint (B1CHEMTS & B2CHEMTS).
3. The timer reset point BLRCHTRST turns on automatically when interval timer BLRCHT reaches interval time setpoint BLRCHTINT. The timer reset point BLRCHTRST may also be turned on by operator command to initiate the start of a new sampling interval.
Sequence of Operations
Interval Operations
1. The chemical interval time setpoint (BLRCHTINT) is an operator-entered setpoint (5 to 150 minutes, initially set at 15 minutes) which divides the day into sampling intervals.
2. Each sampling interval begins when the timer reset point (BLRCHTRST) turns on, resetting the chemical interval timer (BLRCHT, minutes) to 0 minutes.