RG CTH3-150 - Manual (Page 48)

CTH3-S ERIES I NSTALLATION , O PERATION AND S ERVICE M ANUAL
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10.3 Communication Wiring within a Zone of Heaters
Satellite heaters will be wired in series to the central
heater via low voltage control wiring. Communication wiring uses the T28-T31 terminals
on the control, see
Page 42, Figure 25.
FIGURE 25: Communication Wiring within a Zone of Heaters
CENTRAL HEATER CONTROL