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11.3
LOW VOLTAGE CONNECTOR STRIP
PIN
CONNECTION
NOTES
EXTERNAL
When the heater is to be controlled by a 0-10V DC analogue output from a Building Management System
1-2
CONTROL
(BMS), the 0V line should be connected to pin 1 and the 0-10V line should be connected to pin 2.
3-6
SEQUENCING
This facility is not used on the EcoShield water heater.
This sensor controls the temperature of the storage vessel and is factory wired. If time control is required,
7-8
TANK SENSOR
this wiring should be interrupted. (See Section 11.1.1: REMOTE ENABLING for further details.)
TANK
9-10
This facility is not used on the EcoShield water heater.
THERMOSTAT
RUNTIME
An internal volt free contact across pins 11 &1 2 will close in the event of the burner operating. This
11-12
CONTACTS
connection can be used by a BMS to monitor the operation of the heater.
ALARM
An internal volt free contact across pins 13 & 14 will close in the event of the heater locking out. This
13-14
CONTACTS
connection can be used by a BMS to monitor the operation of the heater.
15-16
FLOW SWITCH
This facility is not used on the EcoShield water heater.
If a gas pressure switch is to be used to ensure the incoming gas pressure is correct, the link should be taken
GAS PRESSURE
17-18
out of pins 17 & 18 and the gas pressure switch wiring installed. If there is no continuity across the terminals
SWITCH
the heater will not fire.
If an auxiliary device such as a fan dilution system or mechanical ventilation system is to be used, the link
AUX. PROVING
19-20
should be taken out of pins 19 & 20 and the auxiliary deice safety circuit wiring installed. If there is no
DEVICE
continuity across the terminals the heater will not fire.
When the heater gets a call for heat, a 24VAC supply becomes present on pin 22. Used in conjunction with
AUX. DEVICE
21-22
the ground pin (pin 21), these terminals can be used to send a signal to energise an auxiliary device such as
PILOT SUPPLY
a fan dilution system or mechanical ventilation system.
TABLE 11.3
11.4
ELECTRICAL CONNECTIONS
Cable routing to the High Voltage and Low Voltage Connection Strips can be achieved by removing the
appropriate knockouts on the back panel of the heater. All connections should be secured using an appropriate
cord anchorage. One cord anchor is supplied with the heater for securing the mains supply to the unit. If
additional controls and ancillaries are to be used, the appropriate knockout should be removed and an anchor
such as RS Components part number 607-897 plus locking nut 607-910 should be fitted.
If a knockout is removed by mistake, the resulting hole must be blocked with an appropriate anchor, plug
or grommet to prevent accidental access to the live parts within the heater.
11.5
FUSES
The EcoShield has five internal fuses. F1 will automatically reset, F2 – F5 are slow blow fuses, located and rated
as follows:
22
24VAC
AUX. DEVICE
15
21
GND
PILOT SUPPLY
20
AUX. DEVICE
PROVING
19
18
GAS PRESSURE
SWITCH
17
16
FLOW
SWITCH
15
14
ALARM
CONTACTS
13
12
RUNTIME
CONTACTS
11
10
TANK THERMOSTAT
9
8
TANK
SENSOR
7
6
SHIELD GROUND
5
A
SEQUENCING
4
B
3
SHIELD GROUND
2
0-10VDC
EXTERNAL
GND
CONTROL
1
FIGURE 11.3
LOW VOLTAGE CONNECTION STRIP
LOW VOLTAGE CONNECTION TERMINAL DETAILS
CN4
CN5
CN3
25
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