Aiko CTH3-115, CTH3-150, CTH3-200, CTH3-80 - page 48

CTH3-SERIES INSTALLATION, OPERATION AND SERVICE MANUAL
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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