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MULTI-SPEED MODE
PREFERRED PIPING
FIGURE 1:
FOR CIRCULATORS
ON BOILER SUPPLY
Figure 2:
MULTI-SPEED MODE
PREFERRED PIPING
FOR CIRCULATORS
ZONE 3
ZONE 2
ZONE 1
ON BOILER SUPPLY
FF
ZONE 3
ZONE 2
ZONE 1
PV4
V1
PV4
V1
ALTERNATE PIPING
FOR CIRCULATORS
ON BOILER RETURN
ALTERNATE PIPING
ZONE 3
ZONE 2
ZONE 1
FOR CIRCULATORS
ON BOILER RETURN
V3
V3
V3
ZONE 3
ZONE 2
ZONE 1
P
P
P
V3
V3
V3
V2
V2
V2
P
P
P
PV4
V2
V2
V2
V1
FIGURE 2:
PV4
MULTI-SPEED OR VARIABLE SPEED MODES
Figure 3:
V1
FIGURE 2:
PREFERRED PIPING
FOR ZONE VALVES
MULTI-SPEED OR VARIABLE SPEED MODES
ON BOILER SUPPLY
PREFERRED PIPING
FOR ZONE VALVES
ON BOILER SUPPLY
ZONE 3
ZONE 2
ZONE 1
FF
ZONE 3
ZONE 2
ZONE 1
FF
PV4
PV4
BOILER
V1
BOILER
V1
ALTERNATE PIPING
FOR ZONE VALVES
ON BOILER RETURN
ALTERNATE PIPING
FOR ZONE VALVES
ON BOILER RETURN
ZONE 3
ZONE 2
ZONE 1
V3
V3
V3
ZONE 3
ZONE 2
ZONE 1
ZV3
M
ZV2
M
ZV1
M
V3
V3
V3
V2
V2
V2
ZV3
M
ZV2
M
ZV1
M
PV4
V2
V2
V2
V1
PV4
V1
2
ZONE 1
V3
P
ZONE 1
V3
V2
LAST
P
• AIR PURGING SEQUENCE
BY ZONE
EXPANSION
V2
TANK
LAST
FF
• AIR PURGING SEQUENCE
BY ZONE
EXPANSION
TANK
BOILER
BOILER
FF
EXPANSION
TANK
FF
EXPANSION
TANK
BOILER
BOILER
ZONE 1
ZONE 2
V3
V3
ZONE 1
ZONE 2
ZV1
M
ZV2
M
V3
V3
V2
V2
ZV1
M
ZV2
M
LAST
P
• AIR PURGING SEQUENCE
V2
V2
BY ZONE
EXPANSION
TANK
LAST
P
• AIR PURGING SEQUENCE
BY ZONE
EXPANSION
TANK
ZONE
1
ZONE
1
LAST
FF
P
EXPANSION
TANK
LAST
FF
P
EXPANSION
TANK
BOILER
BOILER
ZONE 2
ZONE 3
V3
V3
P
P
ZONE 2
ZONE 3
V3
V3
V2
V2
FIRST
P
P
KEY:
V2
V2
VI, V2, V3 = SHUT-OFF ISOLATION VALVE
FIRST
P = TACO CIRCULATOR WITH IFC
FF = FAST FILL BOILER FEED VALVE
PV4 = PURGE VALVE
RECOMMENDED PURGING STEPS:
1. CLOSE V1, PV4, V2
2. OPEN V3
3. OPEN FF VALVE
4. OPEN V2, PV4, TO PURGE LAST ZONE
5. CLOSE FF VALVE
6. CLOSE V2, PV4
7. REPEAT STEPS 1 TO 6 FOR EACH
ZONE
ZONE
ZONE
1
2
3
8. OPEN V1 WHEN ALL ZONES ARE PURGED
9. ADJUST SYSTEM TO DESIRED OPERATING
LAST
FIRST
ZONE
ZONE
ZONE
1
2
3
• AIR PURGING
SEQUENCE
BY ZONE
LAST
FIRST
• AIR PURGING
SEQUENCE
BY ZONE
ZONE 3
V3
ZONE 3
ZV3
M
V3
V2
ZV3
M
FIRST
KEY:
V2
VI, V2, V3 = SHUT-OFF ISOLATION VALVE
FIRST
P = TACO CIRCULATOR WITHOUT IFC INSTALLED
FF = FAST FILL BOILER FEED VALVE
PV4 = PURGE VALVE
ZV = ZONE VALVE
RECOMMENDED PURGING STEPS:
1. CLOSE V1, PV4, V2
2. OPEN V3 AND ZV3
3. OPEN FF VALVE
4. OPEN V2, PV4, TO PURGE LAST ZONE
5. CLOSE FF VALVE
6. CLOSE V2, PV4
7. REPEAT STEPS 1 TO 6 FOR EACH
ADDITIONAL ZONE, PURGE ZONE 1 LAST
ZONE
ZONE
8. OPEN V1 WHEN ALL ZONES ARE PURGED
2
3
9. ADJUST SYSTEM TO DESIRED OPERATING
FILL PRESSURE IF REQUIRED
ZONE
ZONE
10. MOVE ALL ZV TO CLOSED/AUTOMATIC POSITION
2
3
FIRST
• AIR PURGING
SEQUENCE
BY ZONE
FIRST
• AIR PURGING
SEQUENCE
BY ZONE
FIRST (ZONE 3)
ADDITIONAL ZONE, PURGE ZONE 1 LAST
FILL PRESSURE IF REQUIRED
FIRST (ZONE 3)
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