Raypak 503A Installation & Operating Instructions Manual page 24

MASTER
VERSA
MASTER
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).
Fig. 25: MVB Cascade System Wiring
24
FOLLOWERS
Fig. 26: MVB Cascade Master Pumps