SINGLE CIRCULATOR — Typical Multiple Zone Valve Panel with Indirect
6
ZONE/
INDIRECT
SWITCH
POSITION
ZONE/
INDIRECT
SWITCH
POSITION
MULTIPLE CIRCULATORS — Typical Three Zone Switch Relay
STEP 3B: HEATING and Indirect Water Heater – continued
NOTE: For proper operation of the boiler reset function, all heating thermostats must input to T-T or ZC-ZR terminals as indicated below.
Jumping the T-T terminals and wiring the thermostat to the primary will override the economy feature.
WIRING
WARNING
Electrical shock hazard. To prevent electrical shock, death or equipment damage, disconnect power supply before
installing or servicing this control.
NOTE – If a Zone Valve Control Panel has no priority zone: To ensure adequate boiler tempera-
ture to satisfy the domestic hot water tank, it may be necessary to turn the Economy Feature off.
NOTE: The wire from ZR to the hot terminal of the indirect circulator will ensure
that indirect calls will fire to limit and receive priority over heating calls.
Tacoʼs SR503 combines ZR amd X2.
HydroStat 3250-Plus Instructions: HydroStat Instructions.8pg 11/14/13 3:43 PM Page 6
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