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Part Number 550-141-857/0107
9
Instruction manualInstruction manual
Instruction manualInstruction manual
Instruction manual
“Tankless coil” boiler application
(Requires a L8124A or C boiler aquastat.) Each zone thermostat will signal the WMCR to start
its zone circulator and start the burner. If boiler temperature drops below low limit (circulator)
setting, all circulating will cease until temperature of boiler water is increased. (See Figure 9 for
suggested wiring.)
Jumper
Remove factory-installed jumper between terminals ZC and ZR.
Connect terminals ZC and ZR to corresponding ZC and ZR terminals on boiler aquastat.
Circulators for zones connected to the WMCR controller will not operate if the boiler tankless
coil aquastat low limit is not satisfied. Terminals ZC/ZR are 120 VAC connections.
Priority
Circulators for zones 2, 3 or 4 will not operate when zone 1 (priority) circulator is actuated.
(Priority switch is ON.) When priority switch is not ON, all zones operate independently of
each other.
Notes
WMCR controllers will not work properly if 120 VAC polarity is not the same at the WMCR
and L8124A or C aquastat 120 VAC power terminals. The neutral and hot wires must not be
reversed.
Any control connected to the WMCR (Example: L8124A or L8124E) is isolated and protected
from circulator current with built-in 120 volt control relay.
Figure 8
Tankless coil boiler
application
WMCR-4 shown — also
applies to WMCR-3 and -6,
but not WMCR-2 (which has
no ZC/ZR relay)
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