Weil-McLain EcoTec 80 Manual page 62

G -
®
ECO Tec
AS FIRED WATER BOILER
Field wiring
(see wiring diagram, Figure 70, page 66) (continued)
Combi models use Input/Output pairs 1 and 4 for 3-way valve operation and cannot be used for any other
purpose. Use Input 2 for Indirect DHW (if needed) and Input 3 for Space Heating applications.
D. System supply and return temperature sensors –
primary secondary piping design.
1. It is recommended to use two (2) strap-on temperature sensors (separate kit
option). Attach one to the system supply piping and the other to the system
return piping. For piping larger than 5 inch diameter or nonmetallic piping,
using immersion sensors will provide faster response.
2. Locate the supply sensor at least six pipe diameters, but no further than 3
feet, downstream from the boiler connection to the main to ensure adequate
mixing.
3. Return sensor – wire between J19 #1 and #2.
4. Supply sensor – wire between J19 #3 and #4.
5. Thermostat wire can be used to connect these sensors.
6. The Control compares the system return temperature with the system supply
temperature.
It is recommended for all primary/secondary heating systems
shown in this manual that the System Supply and Return sensors
to be installed for proper control function. System may not
properly provide desired temperature if sensors are not installed
according to these instructions.
E. Outdoor temperature sensor –
Connector J19
1. The control provides programmable options if using an outdoor
temperature sensor. This sensor is supplied with the boiler.
2. The outdoor sensor must be installed unless specifically
exempted in the Energy Act statement on page 149.
3. Mount the outdoor sensor on an exterior wall, shielded from direct sunlight
or flow of heat or cooling from other sources.
4. The wire outlet on the sensor must be oriented DOWN to prevent water
entry.
5. Connect the sensor leads to the terminal shown at right and in the wiring
diagrams (see Figure 70, page 66). Thermostat wire can be used to connect
the sensor.
F. External limits –
To cause MANUAL reset: Connector J20 #1 & #2
The control will require manual reset after circuit is interrupted.
1. Remove factory-installed jumper and connect isolated contacts of external
limits across J20 pins 1 and 2 to cause the control to enter manual reset
lockout if the limit circuit opens. The limit must close and the control must
be manually reset using the procedure given in this manual. See drawing
at right and wiring diagram Figure 70, page 66.
The control will lockout when a limit in its manual reset circuit
opens (J20 pins 1 & 2). The control activates its alarm terminals
and shuts the boiler down. An operator (user or technician) must
manually reset the control to restart the boiler.
62
–
REQUIRED unless exempted
OPTIONAL
B
80/110/150/199
Recommended when using
Connector J19
M
OILER ANUAL
Strap to supply & return piping
See Figure 70, page 66 for details
See Figure 70, page 66 for details
See Figure 70, page 66 for details.
Part number 550-100-260/0520