FTV I&O Manual
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Boiler and Heating System Piping
53
Table 12-1(a) Field Connections – Low Voltage
Connection
Location
Description
ARGUS LINK –
1
Argus Link Communication
– used to cascade up to 16 boilers. Also for connection to
BMS Expansion Interface Module (for remote burner control – 0-10V).
ARGUS LINK +
2
SENSO
R
COMMON
3
Sensor Common
– Common port for field inputs SYSTEM, OUTDOOR and DHW.
SYSTEM
4
System Temperature Sensor (Manditory for Cascade)
– Wire to terminals 3 and 4 of
the Manager boiler in a
cascade
. Sensor would be installed on the system supply pipe
feeding the Central Heating system to allow accurate control of system temperature.
Sensor is available from NTI, p/n: 84010.
OUTDOOR
5
Outdoor Temperature Sensor
–
A wall mountable OD Sensor is included with each
boiler; connect to terminals 3 and 5. In a cascade, the OD Sensor only needs to be
connected to the main boiler. The use of the OD Sensor is required to allow the boiler
control to automatically infer the heat load of a central heating system.
DHW
6
Tank Thermostat / Sensor (
Not Applicable for FTV-Combi models)
– Connect the
contacts of a DHW Tank Thermostat, or leads of an approved DHW Tank Sensor (NTI
p/n: 84632), to terminals 3 and 6. When using a Thermostat, set DHW mode = 2 (menu
setting 2-08). When using a Sensor, set DHW mode = 1. See Section 17.0 for more details.
THERMOSTAT
7
Room Thermostat Input
– Connect central heat demand switch (room thermostats or
zone control end switch),
or
“nighttime setback” / “time of day” switch to terminals 7 and
8. Switch must be an isolated end switch.
8
Table 12-1(b) Field Connections – Line Voltage
Connection
Location
Description
EXT. LIM
9
120V Safety Limit Circuit
(Factory jumpered) – wire the output contacts of any optional
external limit device (i.e. LWCO) in series with terminals 9 and 10. Note: if using an
external limit device, the factory jumper must be removed.
10
DHW PUMP
11
120VAC output to the DHW circulator; powered during a demand for DHW. Total load
of DHW PUMP and BOILER PUMP must not exceed 2.6Amps. Not applicable for FTV-
Combi models.
CH PUMP
12
120VAC output to the Central Heating circulator; powered during a demand for Central
Heat. Total load of CH PUMP and BOILER PUMP must not exceed 2.6Amps.
BOILER PUMP
13
120VAC output to the main boiler circulator; powered during all demands. Total load of
BOILER PUMP and CH PUMP (or DHW PUMP) must not exceed 2.6Amps. Not
applicable to FTV-Combi models – pump is factory wired.
L2 NEUTRAL
14
Location for connecting neutral of the power supply and all circulators.
15
L1 120VAC
16
Location for connecting line voltage of the power supply. Note; most installation codes
require the installation of a service switch to break line voltage to the appliance.
Ground
Green
Wire
Location for connecting earth ground and for grounding all circulators.
ECM Pumps
– due to the large inrush current of ECM pumps, they should only be
switched via an isolation relay, not directly via the boiler controller. Powering ECM
pumps directly will lead to premature failure of the boiler controller’s pump relay
contacts.
Max Load
– The total load rating of circulators powered by outputs BOILER PUMP and
CH PUMP, or BOILER PUMP and DHW PUMP cannot exceed 2.6 Amps.