Field Control Wiring; Room Thermostat Connection (Enable/Disable); Air Damper; Outdoor Temperature Sensor - Riello Array AR 3000 Installation And Operation Manual

If an external electrical power source is used, the installed boil-
er must be electrically bonded to ground in accordance with the
requirements of the authority having jurisdiction. In the absence
of such requirements, the installation shall conform to National
Electrical Code (NEC), ANSI/NFPA 70 and/or the Canadian Electrical
Code (CEC) Part I, CSA C22.1 Electrical Code.

2.13 Field control wiring

Each unit is fully wired from the factory with an internal operat-
ing control system. No field control wiring is required for normal
operation.
However, the control system used with all Array boilers does allow
for some additional control and monitoring features. Wiring con-
nections for these features are made on the Input / Output (I/O)
terminal strips located behind the removable cover on the inner
side of the front door of the unit, as shown in Fig. 22.
NOTE: Any electrical load connected to the terminal strip (external
pumps, air damper, alarm) must be powered through a relay, not
included in the boiler, to be provided and wired by the installer.
CASCADE AIR Out Supply DHW Tank
LINK DAMPER Door Sensor
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
ALARM PUMP DHW /
3-WAY DHW
101 102 103 104 105106 107 108 109 110 111 112 113 114 115
Fig. 22 I/O Terminal Strips
All field wiring is installed from the rear of the panel by routing the
wires through one of the openings provided on the sides of the
cover panel.
Room 0-10 V System BMS - RS232
+
Sensor Thermostat Sensor RX TX GND
3-WAY CH MAIN PUMP /

Air Damper

PUMP CH
Openings for wires
Fig. 23 Opening on the Cover Panel

2.13.1 Room Thermostat Connection (Enable/Disable)

The Room Thermostat (Enable/Disable) terminals (dry contacts)
come pre-wired closed (jumped) from the factory. For connecting
a room thermostat, the jumper must be removed and the ther-
mostat wires must be connected to terminals 11 and 12, as shown
in Fig. 22.
2.13.2 Air Damper
The Air Damper output comes disabled from the factory. For con-
necting an air damper, the Programmable Output 3 must be set to
10 and the damper wires must be connected to terminals 3 and 4,
as shown Fig. 22.
The Air Damper is connected to output J3-6 which is a Triac con-
trolled output.
This output need a minimum load of approx. 10VA to work cor-
rectly and the max load must be limited to 50VA at mains voltage.
Connection of an external relay to this output to be able to switch
a higher load is only possible when an additional resistor or load
is added to make sure the minimum load requirements are met.

2.13.3 Outdoor Temperature Sensor

If outdoor temperature sensor is to be used, the outdoor probe
needs to be connected to terminals 5 and 6 as shown in Fig. 22.
The outdoor probe shall be installed on an outer wall, North or
North/East, away from windows, door, and ventilation grids.
Never install the probe in a position exposed to the sun.
The maximum length is 300' (100 meters), if the cable length ex-
ceeds 32' (10 meters) a shielded cable is required and shall be con-
nected to chassis ground.
NOTE: All sensors and low voltage wiring shall not be routed in
direct contact or near high voltage power.
15
INSTALLATION