Installation

© 2001 D 364 - 07/01 20 of 36
DHW Sensor
A DHW Sensor 071 can connect to the DHW input. Connect the two wires from the
sensor to the Com and DHW terminals (27 and 28).
STEP FIVE
——————
TESTING THE WIRING
Each terminal block must be unplugged from its header on the control before power is
applied for testing. To remove the terminal block, pull straight down from the control.
The following tests are to be performed using standard testing practices and procedures
and should only be carried out by properly trained and experienced persons.
A good quality electrical test meter, capable of reading from at least 0 – 300 V (ac) and
at least 0 – 2,000,000 Ohms, is essential to properly test the wiring and sensors.
Test The Sensors
In order to test the sensors, the actual temperature at each sensor
location must be measured. A good quality digital thermometer with
a surface temperature probe is recommended for ease of use and
accuracy. Where a digital thermometer is not available, a spare
sensor can be strapped alongside the one to be tested and the
readings compared. Test the sensors according to the instructions
in the Data Brochure D 070.
Test The Power Supply
Make sure exposed wires and bare terminals are not in contact with
other wires or grounded surfaces. Turn on the power and measure
the voltage between the Power L and Power N terminals (7 and
6) using an AC voltmeter, the reading should be between 108 and
132 V (ac).
Test The Powered Inputs
Mixing Demand
If a mixing demand is used, measure the voltage between the Mix
Demand terminals (1 and 2). When the mixing demand device
calls for heat, you should measure between 20 and 260 V (ac) at
the terminals. When the mixing demand device is off, you should
measure less than 5 V (ac).
Boiler Demand
If a boiler demand is used, measure the voltage between the
Boil Dem and the Com Dem terminals (3 and 4). When the boiler
demand device calls for heat, you should measure between 20
and 260 V (ac) at the terminals. When the boiler demand device
is off, you should measure less than 5 V (ac).
DHW Demand
If a DHW demand is used, measure the voltage between the Setp
/ DHW Dem and the Com Dem terminals (5 and 4). When the
DHW demand device calls for heat, you should measure between
20 and 260 V (ac) at the terminals. When the DHW demand
device is off, you should measure less than 5 V (ac).
Setpoint Demand
If a setpoint demand is used, measure the voltage between the
Setp / DHW Dem and the Com Dem terminals (5 and 4). When
the setpoint demand device calls for heat, you should measure
between 20 and 260 V (ac) at the terminals. When the setpoint
demand device is off, you should measure less than 5 V (ac).
Com
27
DHW
28
Com
24
Bo
il
25
Zo in
Boil
26
V
1
2
Mix
20 to 260 V (ac)
Demand
V
Boil
D
em
Com
D
em
3
4
20 to 260 V (ac)
V
Com
Dem
Setp/
DHW
4
5
20 to 260 V (ac)
V
6
N
L
P
ower
108 to 132 V (ac)
7