RECOMMENDED PURGING STEPS:
1. CLOSE V1, PV4, V2
2. OPEN V3
3. OPEN FF VALVE
4. OPEN V2, PV4, TO PURGE LAST ZONE
FIRST (ZONE 3)
5. CLOSE FF VALVE
6. CLOSE V2, PV4
7. REPEAT STEPS 1 TO 6 FOR EACH
ADDITIONAL ZONE, PURGE ZONE 1 LAST
8. OPEN V1 WHEN ALL ZONES ARE
PURGED
9. ADJUST SYSTEM TO DESIRED OPERATING
FILL PRESSURE IF REQUIRED
KEY:
VI, V2, V3 = SHUT-OFF ISOLATION VALVE
P = TACO CIRCULATOR
FF = FAST FILL BOILER FEED VALVE
PV4 = PURGE VALVE
FC = FLOW CHECK VALVE
Figure 3:
Typical Installation for Zoned Hydronic Heating Systems
Boiler Supply
(Option No. 1)
Boiler Return
(Option No. 2)
3
