Lochinvar ECOKNIGHT EKW46CE Installation Manual page 53

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
24VAC Output –
13-
FLOW SWITCH constant when unit is
14
powered
24VAC Output –
15- TANK
constant when unit is
16 THERMOSTAT
powered
24VAC Output –
17- HEAT/LOOP
constant when unit is
18 DEMAND 3
powered
24VAC Output –
19- HEAT/LOOP
constant when unit is
20 DEMAND 2
powered
24VAC Output –
21- HEAT/LOOP
constant when unit is
22 DEMAND 1
powered
23- SYSTEM Contacts read a
24 SENSOR resistance
25- OUTDOOR Contacts read a
26 SENSOR resistance
27- DHW RECIRC Contacts read a
28 SENSOR resistance
29- TANK 24VAC Output – When
30 SENSOR unit calls for heat.
31-
CASCADE Communication
34
35-
BMS IN
36
37-
SYS PUMP IN
38
39-
BLR PUMP OUT
40
41-
RATE OUT
42
43- MODBUS/BACNET
46 OPTION
OUTPUT / INPUT
An internal volt free contact across pins 1 and 2 will close in the event of the heater locking
Volt free – Close on alarm
out. This connection can be used by a BMS to monitor the operation of the heater.
Volt free – Close when unit An internal volt free contact across pins 3 and 4 will close in the event of the burner
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 unit
conjunction with the ground pin (pin 8), these terminals can be used to send a signal to
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 unit
used, the link should be taken out of pins 9 and 10 and the auxiliary deice safety circuit
calls for heat.
wiring installed. If there is no continuity across the terminals the heater will not fire.
If a gas pressure switch is to be used to ensure the incoming gas pressure is correct, the
24VAC Output – constant
link should be taken out of pins 11 and 12 and the gas pressure switch wiring installed. If
when unit is powered
there is no continuity across the terminals the heater will not fire.
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.
This connection should not be used for controling DHW temperature. The supplied temperature sensor
should be connected to pins 29 & 30. For further information, please refer to Section 13.0:
The Tank thermostat can be used as an enable – when a tank sensor is fitted and the BMS
Thermostat is enabled see section 15.2.1 The tank sensor (terminals 29 & 30) is still used for
temperature control, the thermostat connection just used to enable.
This connection should not be used with a water heater.
This connection should not be used with a water heater.
This connection should not be used with a water heater.
This connection should not be used with a water heater.
This connection should not be used with a water heater.
The heater can control a DHW recirculation pump. A sensor must be installed in the 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 the output
from the heater. This connection is not polarity sensitive. This sensor is 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" 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 Management
0 – 10 V DC
System (BMS), the 0V line should be connected to pin 35 and the 0-10V line should be connected to
input
pin 36. See section 21.7
0 – 10 V DC
This connection should not be used with a water heater.
input
0 – 10 V DC
This connection should not be used with a water heater.
output
0 – 10 V DC Provides a 0-10V signal that is proportional to the firing rate of the heater. This may be used by a BMS
output system to monitor the actual rate of the heater.
When an optional ModBus or BACnet interface module is installed the RS-485 cable is connected to
Communication
these terminals
15.4.2
LOW VOLTAGE CONNECTION TERMINAL DETAILS
NOTES
53