Lochinvar ECOKNIGHT EKW116CE Installation, Commissioning, Maintenance And User Instructions page 61

16.5.1
LOW VOLTAGE CONNECTION STRIP
PIN CONNECTION
1-2 ALARM CONTACTS
RUNTIME
3-4
CONTACTS
24VAC RECIRC
5-6 PUMP
RELAY COIL
24VAC LOUVER
7-8
RELAY COIL (COM)
LOUVER PROVING
9-10
SWITCH
GAS PRESSURE
11-12
SWITCH
13-14 FLOW SWITCH
15-16 TANK THERMOSTAT
HEAT/LOOP
17-18
DEMAND 3
HEAT/LOOP
19-20
DEMAND 2
HEAT/LOOP
21-22
DEMAND 1
23-24 SYSTEM SENSOR
25-26 OUTDOOR SENSOR
DHW RECIRC
27-28
SENSOR
29-30 TANK SENSOR
31-34 CASCADE
35-36 BMS IN
37-38 SYS PUMP IN
39-40 BLR PUMP OUT
41-42 RATE OUT
MODBUS/BACNET
43-46
OPTION
OUTPUT /
INPUT
Volt free – Close on An internal volt free contact across pins 1 and 2 will close in the event of the heater locking
alarm out. This connection can be used by a BMS to monitor the operation of the heater.
Volt free – Close when An internal volt free contact across pins 3 and 4 will close in the event of the burner
unit running operating. This connection can be used by a BMS to monitor the operation of the heater
24VAC Output – when
When the heater gets a call for heat from the DHW RECIRC SENSOR a 24VAC supply will
recirc sensor calls –
be sent to a DHW recirculation pump relay (field supplied)
switches on Neutral
When the heater gets a call for heat, a 24VAC supply becomes present on pin 7. Used in
24VAC Output – When conjunction with the ground pin (pin 8), these terminals can be used to send a signal to
unit calls for heat. energise an auxiliary device such as a fan dilution system or mechanical ventilation
system.
If an auxiliary device such as a fan dilution system or mechanical ventilation system is to be
24VAC Output – When
used, the link should be taken out of pins 9 and 10 and the auxiliary deice safety circuit
unit calls for heat.
wiring installed. If there is no continuity across the terminals the heater will not fire.
24VAC Output – If a gas pressure switch is to be used to ensure the incoming gas pressure is correct, the
constant when unit is link should be taken out of pins 11 and 12 and the gas pressure switch wiring installed. If
powered there is no continuity across the terminals the heater will not fire.
24VAC Output – If a flow switch is to be used to ensure the primary pump is operating, the link should be
constant when unit is taken out of pins 13 and 14 and the flow switch wiring installed. If there is no continuity
powered across the terminals the heater will not fire.
This connection should not be used for controlling DHW temperature. The supplied
temperature sensor should be connected to pins 29 & 30. For further information, please
refer to Section 13.0:
24VAC Output –
constant when unit is
The Tank thermostat can be used as an enable – when a tank sensor is fitted and
powered
the BMS Thermostat is enabled see section Error! Reference source not found. The
tank sensor (terminals 29 & 30) is still used for temperature control, the thermostat
connection just used to enable.
24VAC Output –
constant when unit is This connection should not be used with a water heater.
powered
24VAC Output –
constant when unit is This connection should not be used with a water heater.
powered
24VAC Output –
constant when unit is This connection should not be used with a water heater.
powered
Contacts read a
This connection should not be used with a water heater.
resistance
Contacts read a
This connection should not be used with a water heater.
resistance
Contacts read a The heater can control a DHW recirculation pump. A sensor must be installed in the
resistance circulation loop return and connected to terminals 27 and 28.
A sensor located in the direct vessel must be connected to terminals 29 and 30 to control
24VAC Output – When the output from the heater. This connection is not polarity sensitive. This sensor is
unit calls for heat. included with the EcoKnight™ water heater.
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"
Communication
terminals (pin 32) should be linked together and all "B" terminals (pin 33) should be linked
together.
When the heater is to be controlled by a 0-10V DC analogue output from a Building
0 – 10 V DC input Management System (BMS), the 0-10V line should be connected to pin 35 and the 0V line
line should be connected to pin 36. See section 21.7
0 – 10 V DC input This connection should not be used with a water heater.
0 – 10 V DC output This connection should not be used with a water heater.
Provides a 0-10V signal that is proportional to the firing rate of the heater. This may be
0 – 10 V DC output
used by a BMS system to monitor the actual rate of the heater.
When an optional ModBus or BACnet interface module is installed the RS-485 cable is
Communication
connected to these terminals.
NOTES
61