24
VERSA
MASTER
MASTER
FOLLOWERS
Fig. 25: MVB Cascade System Wiring
Fig. 26: MVB Cascade Master Pumps
Cascade System Pump and
Sensor Wiring
1. On the boiler designated as the Master, connect
the system pump enable wiring to the terminal
block at the rear of the unit. The connections are
dry contacts rated for pilot duty only (5A maxi-
mum).
2. Connect the boiler pump enable wires to the termi-
nal block at the rear of their unit. The connections
are dry contacts rated for pilot duty only (5A maxi-
mum).
3. Connect the system supply sensor to terminals 6
and 7 on the field wiring strip located on the Master
PIM™ (See Fig. 23).
4. Connect the Outdoor sensor (if used) to terminals
8 and 9 on the field wiring strip located on the
Master boiler (See Fig. 23).
Summary of Contents for 503A
Page 43: ...43 WIRING DIAGRAM Models 503A 2003A...
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