P-K SOLIS™
Gas Fired Boiler
Technical Service 1.877.728.5351
Revised: March 15, 2021
Released: March 15, 2021
Patterson-Kelley 2021
All Rights Reserved.
2701000090 P-K SOLIS NURO Installation and
Owners Manual (Rev A).docx
Page 18
Start Interlock #1
–
The Start Interlock #1 TB2-7 & TB2-8 terminals can be used for auxiliary safety
devices such as damper limit switches, control valve limit switches, emergency stop buttons, and low
water cutoff devices. This circuit is energized with 120VAC, so the contacts on any auxiliary safety
devices must be rated for a minimum of 120VAC. The appliance ships with a factory-installed jumper
across Start Interlock #1 and Start Interlock #2 terminals. Remove the jumper(s) if using any auxiliary
safety devices.
Auxiliary Input #2
–
The TB2-9 & TB2-10 terminals are for Auxiliary Input #2. This circuit is energized
with 120VAC
.
Auxiliary Input #1
–
The TB2-11 & TB2-12 terminals are for Auxiliary Input #1. This circuit is
energized with 120VAC
.
Air Damper Interlock
– The Air Damper Interlock TB2-13 & TB2-14 terminals
allow for proof of open
end limit switch on a motorized air damper. This circuit is energized with 120VAC, so the contacts on
the end limit switch must be rated for minimum 120VAC. The appliance ships with a factory-installed
jumper across the Air Damper Interlock terminals. Remove the jumper if connecting a motorized air
damper with end limit switch.
Ground
– Grounding connection for auxiliary safety/limit devices on terminal TB2-15.
Relay A, B, C & D
– User-configurable relay outputs A (TB2-22 & TB2-23), B (TB2-20 & TB2-21), C
(TB2-18 & TB2-19) & D (TB2-16 & TB2-17). The normally-open contacts on these relays have a
maximum voltage rating of 240VAC and maximum current capacity of 1/2 Amp.
Master Alarm Relay
– The Master Alarm Relay TB2-24 & TB2-25 terminals are normally-open dry
contacts that close in the event of an alarm output from the NURO control. The normally-open contacts
on this relay have a maximum voltage rating of 240VAC and maximum current capacity of 1/2 Amp.
NOTE:
The Start Interlock circuit must close within 5 minutes of a call for heat. Failure to close the
Start Interlock circuit will cause the appliance to lockout on alarm.
NOTE:
The boiler ships with a factory-installed jumper across the Air Damper Interlock terminals.
Remove the jumper if connecting a motorized air damper with end limit switch.
NOTE:
This ground terminal is connected to the TB2 sheet metal and is not common with the
appliance’s electrical service ground.
NOTE:
Refer to
6.1
, for proper
wiring and configuration of the electrical connections. Relays A
through D can be user-configured through the NURO
®
touch screen interface to control devices
such as the Comfort Heat (CH) pump, Domestic Hot Water (DHW) Pump, Air Damper, System
Pump, etc.
