INSTALLATION MANUAL AND OPERATING INSTRUCTIONS
AR861-2II & AR861-3II Control Features
• 2-Zone AR861-2II or 3-Zone AR861-3II
• Auto-Reset Electronic Fuse Protection –
Eliminates
Nuisance Service Calls
• 15VA Transformer –
Robust Components Provide Years
of Trouble -Free Service
• Ice Cube Technology – Plug-In Replacement Relays
• Priority Function
• 5-Year Warranty
AR861-2II & AR861-3II Sequence of Operation
If the Priority Switch is in the “OFF” Position
:
1. When a zone calls for heat the corresponding
zone LED is illuminated.
2. The relay for the corresponding zone will then
close.
3. A/R terminals will close starting the boiler.
4. The corresponding GZ/HZ terminals will be
energized with 120 Volts.
If the Priority Switch is in the “ON” Position
:
1.Zone 1 becomes the priority zone.
2. When zone 1 calls for heat, the priority zone is
activated and all other zones are deactivated
(circulators for zones 2 and higher will not
operate). Zone 1 LED is illuminated indicating a
call for heat.
3. Zone 1 relay will close.
4. A/R terminals will close starting the boiler.
5. GZ 1/HZ 1 will be energized with 120 Volts.
8
PN 240005122 Rev. D [11/15/2021]
