NTI 87740, Installation And Operation Manual

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TFTN 085-199 Installation and Operation Manual
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Labeling – Label all wires prior to disconnecting them when servicing controls. Wiring errors can
cause improper and dangerous operation. Failure to follow instructions may result in property
damage or personal injury.
Continuity – Before connecting the line voltage wiring, perform a continuity check between all
wires and ground to make sure that there are no electrical leaks that could blow a fuse or damage
electrical components. Also check the polarity of the line and neutral wires. Line must measure
120VAC to ground; neutral must measure zero. Failure to follow instructions may damage the unit.
Table 12-1 High Voltage Wiring (Listed in order from left to right)
Connection Description
BLR
PUMP
L BOILER PUMP 120VAC OUTPUT
– powers during all demands. Circuit is protected with the main PCB
fuses; see Figure 18-4.
N
DHW
PUMP
L DHW PUMP 120VAC OUTPUT
– powers during DHW tank demands; see Low Voltage Field Connection
DHW SWITCH/NTC . Circuit is protected with the main PCB fuses; see Figure 18-4.
N
AUX1
PUMP
L
AUX1 PUMP 120VAC OUTPUT – operation is determined by the setting of Pump Control Settings option
Auxiliary Pump 1 Selection (24.7.0):
•
None (default) – output does not function.
•
System Pump – powers during CH demands. Will also power during Downstream IWH demands if
DHW Setup -> Advanced Settings option System Pump Activation Logic (24.4.6) = Always Active.
•
DHW Recirc – powers during DHW Recirc demands; see Low Voltage Field Connection AUX2 NTC .
•
Buffer Tank – powers during Buffer Tank demands; see Low Voltage Field Connections AUX1 NTC and
AUX2 NTC .
Circuit is protected with the main PCB fuses; see Figure 18-4.
N
AUX2
PUMP
L
AUX2 PUMP 120VAC OUTPUT – operation is determined by the setting of Pump Control Settings option
Auxiliary Pump 2 Selection (24.7.1):
•
None – output does not function.
•
System Pump (default) – powers during CH demands. Will also power during Downstream IWH
demands if DHW Setup -> Advanced Settings option System Pump Activation Logic (24.4.6) = Always
Active.
•
DHW Recirc – powers during DHW Recirc demands; see Low Voltage Field Connection AUX2 NTC .
•
Buffer Tank – powers during Buffer Tank demands; see Low Voltage Field Connections AUX1 NTC and
AUX2 NTC .
Circuit is protected with a dedicated 5A fuse at “ Zone Outputs/AUX2 ”; see Figure 18 -4.
N
LINE L Location for connecting Line of the incoming 120VAC power supply.
NEUTRAL
N Location for connecting Neutral of the incoming 120VAC power supply, and optional Neutral junction for
120VAC loads, e.g., zone pumps.
N
ZONE 1
ZONE OUTPUTS – engage when a CH demand is applied to the respective T-STAT input (or via NTI Room
Sensor configured to an individual zone). Output voltage is sourced from ZONE INPUT . When the
respective zone demand ends, the output will remain powered until Pump Control Settings option Zone
Outputs Overrun Time (7.2.8) elapses. Outputs disengage (following the overrun time) when a DHW
demand is applied.
Each circuit is protected with a dedicated 5A fuse at “ Zone Outputs/AUX2 ”; see Figure 18 -4.
NOTE: the Zone Outputs Overrun Time can be aborted immediately upon apply a DHW demand, by
setting Zone Outputs Overrun During DHW (7.2.9) = Off.
ZONE 2
ZONE 3
120V 120VAC POWER SUPPLY – jumper to ZONE INPUT if Zone Outputs loads are 120VAC.
ZONE INPUT
ZONE INPUT POWER – jumper to required power supply for the zone outputs used, i.e., jumper to 120V
for zone pumps, or R (24V) for zone valves.
R (24V)
24VAC POWER SUPPLY – jumper to ZONE INPUT if Zone Outputs loads are 24VAC. Circuit is protected
with a 2 Amp blade style fuse, located on the Low Voltage Connection PCB; see Figure 18-4.
COMMON
24VAC COMMON – return/neutral leg of 24VAC power supply. Location for connecting return of 24VAC
loads, e.g., zone valves.