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10 BOILER CONTROL INTERFACE
A terminal strip for the remote connection is located behind the hinged control panel at the top of the cabinet and
is accessed by removing the bottom cover and then removing the screws at the top of the hinged cover.
10.1 If BMS/BAS provides remote on/off control directly to each boiler but allows boiler to control modulation on
its own:
• Remove the jumper connecting terminals R1 and R2
• Connect the BMS output leads for the enable/disable function to terminals R1 and R2
• Leave all other wires in their initial positions
10.2 If BMS/BAS provides MODULATION control through a 4 to 20 milliamp directly to each boiler:
• Remove the jumper connecting terminals R1 and R2
• Connect the BMS output leads for the enable/disable function to terminals R1 and R2 (no polarity)
• Remove blue wire from terminal T1 and cap the end with a wire nut. Secure the loose wire.
• Connect the BMS variable signal output leads to terminals T1 and T2 (T1 is positive, T2 is negative)
• On the TempTrac Control, move parameter St1 up to its maximum setting of 230°F. This setting effectively
takes the TempTrac out of the way and allows complete control by the BMS system.
10.3 BAS connection over network with MODBUS RTU protocol (requires option ALMMB)
• An optional serial connection cable (part no. 106624) enables the TempTrac to communicate via Modbus
RTU to a Building Automation System or to the OnTrac multiple boiler control. Connections are made using
shielded, twisted pair wiring in a daisy chain arrangement.
ALARM
MESSAGE
CAUSE RESULTS OF ALARM CONDITION
RECOMMENDED
ACTION
“P1” TP1 probe failure
Inlet temperature sensor is not connected or
is reading incorrectly. Call for heat and burner
modulation output signal will revert to low fire.
Check wiring and sensor
Terminals 14 & 17
“P2” TP2 probe failure
Temperature sensor is not connected or is
reading correctly. Freeze protection is
disabled.
Check wiring and sensor
Terminals 15 & 17
“P3” TP3 probe failure
Temperature sensor is not connected or is
reading correctly. Outdoor reset disabled.
Warm weather shutdown disabled.
Check wiring and sensor
Terminals 16 & 17
“HA”
High temperature limit
setpoint exceeded
Buzzer sounds, operation continues Manual reset required
“LA”
Low temperature
alarm
Buzzer sounds, operation continues
HP
High gas pressure
alarm
Unit deenergized after timer delay Manually reset required
LP
Low gas pressure
alarm
Unit deenergized after timer delay Manually reset required
Mn1
Maintenance alarm
for output 1
Buzzer sounds, operation continues Check wiring and sensor
Mn2
Maintenance alarm
for output 2
Buzzer sounds, operation continues Check wiring and sensor
Mn3
Maintenance alarm
for output 3
Buzzer sounds, operation continues Check wiring and sensor
“rtc”
The real time clock
has lost its setting
Energy saving function disabled Reprogram clock
“rtF” Real time clock failure Energy saving function disabled Replace control
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