Whirlpool EDP/EDN - Manual (Page 14)

Page 14 LAARS HEATING SYSTEMS
Figure 23. Multiple Zones with Three Wire Zone Valves (Requires Isolation Relay).
Figure 24. Multiple Zones with Circulators and Room Thermostats.
NOTE: This wiring is NOT the same
as shown by valve manufacturer.
4. Multi zone/Multi-relay-circulator Installations:
Multiple circulators must not exceed 5 amps total
when connected to blue wire (see Figure 24). NOTE: On zone valve systems such as Taco,
Automag and others which do not have isolated (dry)
contact end switches, a single pole isolating relay must
be utilized (see Figure 23).
Figure 25. Wiring for Single Zone Power Stealing Type Clock Thermostats That Require 24 VAC.
NOTE: This wiring required only for
single zone applications utilizing
clock thermostats requiring 24 volt
power supply.