Lochinvar HERALD HCB116CE, Руководство по установке

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PIN CONNECTION OUTPUT / INPUT NOTES
1-2 ALARM CONTACTS Volt free – Close on alarm
An internal volt free contact across pins 1 and 2 will close in the event of the heater locking out.
This connection can be used by a BMS to monitor the operation of the heater.
3-4
RUNTIME
CONTACTS
Volt free – Close when unit
running
An internal volt free contact across pins 3 and 4 will close in the event of the burner operating.
This connection can be used by a BMS to monitor the operation of the heater
5-6
24VAC RECIRC PUMP
RELAY COIL
24VAC Output – when
recirc sensor calls –
switches on Neutral
When the heater gets a call for heat from the DHW RECIRC SENSOR a 24VAC supply will be
sent to a DHW recirculation pump relay (field supplied)
7-8
24VAC LOUVER
RELAY COIL (COM) 24VAC Output – When unit
calls for heat.
When the heater gets a call for heat, a 24VAC supply becomes present on pin 7. Used in
conjunction with the ground pin (pin 8), these terminals can be used to send a signal to energise
an auxiliary device such as a fan dilution system or mechanical ventilation system.
9-10
LOUVER PROVING
SWITCH
24VAC Output – When unit
calls for heat.
If an auxiliary device such as a fan dilution system or mechanical ventilation system is to be
used, the link should be taken out of pins 9 and 10 and the auxiliary deice safety circuit wiring
installed. If there is no continuity across the terminals the heater will not fire.
11-12
GAS PRESSURE
SWITCH
24VAC Output – constant
when unit is powered
If a gas pressure switch is to be used to ensure the incoming gas pressure is correct, the link
should be taken out of pins 11 and 12 and the gas pressure switch wiring installed. If there is no
continuity across the terminals the heater will not fire.
13-14 FLOW SWITCH
24VAC Output – constant
when unit is powered
If a flow switch is to be used to ensure the primary pump is operating, the link should be taken out
of pins 13 and 14 and the flow switch wiring installed. If there is no continuity across the terminals
the heater will not fire.
15-16 TANK THERMOSTAT
24VAC Output – constant
when unit is powered
An on-off type thermostat located in an indirect Calorifier can be connected to terminals 15 and 16
to control the output from the boiler. This connection is not polarity sensitive. Not to be used in
conjunction with the tank sensor.
17-18 HEAT/LOOP DEMAND 3
24VAC Output – constant
when unit is powered
An on-off type thermostat or modulating room sensor can be connected to terminals 17 and 18 to
control the output from the boiler. This connection is not polarity sensitive. Can also be used for a
BMS 0V enable signal
19-20 HEAT/LOOP DEMAND 2
24VAC Output – constant
when unit is powered
An on-off type thermostat or modulating room sensor can be connected to terminals 19 and 20 to
control the output from the boiler. This connection is not polarity sensitive. Can also be used for a
BMS 0V enable signal
21-22 HEAT/LOOP DEMAND 1
24VAC Output – constant
when unit is powered An on-off type thermostat or modulating room sensor can be connected to terminals 21 and 22 to
control the output from the boiler. This connection is not polarity sensitive. Can also be used for a
BMS 0V enable signal
23-24 SYSTEM SENSOR Contacts read a resistance
When configured in a cascade, the Master boiler will use the system sensor to monitor and control
the output from the cascade. This sensor should be mounted in the boiler flow.
25-26 OUTDOOR SENSOR Contacts read a resistance
If the boiler is to be compensated to the outside temperature, an outdoor sensor should be
connected to pins 25 and 26. This connection is not polarity sensitive.
27-28 DHW RECIRC SENSOR Contacts read a resistance
The heater can control a DHW recirculation pump. A sensor must be installed n the circulation loop
return and connected to terminals 27 and 28.
29-30 TANK SENSOR
24VAC Output – When unit
calls for heat.
A sensor located in an indirect Calorifier can be connected to terminals 29 and 30 to control the
output from the boiler. This connection is not polarity sensitive. Not to be used in conjunction with
the tank thermostat
31-34 CASCADE Communication
If the heaters are to be operated in a cascade, shielded 2-wire twisted pair communication cable
should be used. The shielding should be connected to pin 31 or 34 and then all “A” terminals (pin
32) should be linked together and all “B” terminals (pin 33) should be linked together.
35-36 BMS IN 0 – 10 V DC input
When the heater is to be controlled by a 0-10V DC analogue output from a Building Management
System (BMS), the 0V line should be connected to pin 35 and the 0-10V line should be connected
to pin 36.
37-38 SYS PUMP IN 0 – 10 V DC input
If a variable speed pump is used in the primary loop, and a 0-10V signal is available from the speed
control, this signal can be used to control the modulation of the boiler as primary flow increases or
decreases. The 0-10V line should be connected to pin 37 and the 0V line to pin 38
39-40 BLR PUMP OUT 0 – 10 V DC output
This 0-10V output is available to control the speed of a variable speed boiler pump in order to
maintain a minimum temperature difference across the heat exchanger. This feature is only to be
used with primary/secondary piping systems and a supply sensor MUST be installed.
41-42 RATE OUT 0 – 10 V DC output
Provides a 0-10V signal that is proportional to the firing rate of the heater. This may be used by a
BMS system to monitor the actual rate of the heater.
43-46 MODBUS/BACNET OPTION Communication
When an optional ModBus or BACnet interface module is installed the RS-485 cable is connected
to these terminals.
15.4.2 LOW VOLTAGE CONNECTION TERMINAL DETAILS