Slant/Fin VSL-160C Part A - Manuel (Page 28)

28
9.1 - Connecting
the boiler to an
indirect water
heater
This boiler, can be connected to
an indirect water heater. The water
connection must be made per fi gure
7-7. Heating pump item “9” of Figure
7-7 is mandatory for boiler model 160-
B. The electrical connections must be
made per fi gure 9-1. To change the
logic of the boiler, to drive and load an
indirect water heater, follow the steps
below while refering to Figure 9-2:
1. disconnect the boiler from the
electrical supply;
2. remove the boiler casing according
to the instructions given in section
14.2;
3. push the plastic spring tabs “B”;
4. open the front half of the electrical
box in the “C” direction;
9 - INSTALLATION - Connecting to an indirect water heater
5. move switch #1, item “D” to its “ON”
position as marked on the control
board;
6. move switch #5 in the OFF position;
7. on model 160-C, on the rear side
of the electrical junction box board,
if present, disconnect the plug with
two wires, item “E”, corresponding
to wires #44 and #45.
8. on model 160-C, on the rear side
of the electrical box, disconnect
the electrical plug from the diverter
valve (see Figure 3-1, item “35”).
When you disconnect the plug you
must insure that the boiler is in the
heating mode. If you are not sure,
light the boiler ON, wait the display
show “F” and then light-off the
boiler. Now you can disconnect the
plug from the diverter valve.
9. use a # 18 AWG two wire cable to
connect the indirect water heater
temperature sensor to terminals
“15” and “16”, as per Figure 9-1
10. insert the probe of the indirect
water heater sensor into the socket
of the indirect water heater.
WARNING!!!
Since the
indirect water heater temperature
sensor wires conduct 24 Vac,
they must never be run through
conduits containing 120 Vac
power wires or an electrical
shock hazard will exist.
WARNING!!!
Once the
boiler is connected to an indirect
water heater, it will perform a
weekly antilegionella cycle. This
cycle raises the water heater
temperature to 140°F one time
per week.
NOTE! A few cable conduit holes are
provided on the bottom right side of
the boiler
CAUTION!!!
If the pump is larger
than 1 hp or 2 amps, you must
isolate with a relay.
11. reinstall all dismounted parts.
Figure 9-1 Electrical connections for 160-B model (see Figure 7-7)
GROUND
NEUTRAL
120Vac LINE (HOT)
System pump (see
piping diagram of
Figure 7-7)
120Vac hot
Room
thermostat
Outdoor sensor (optional)
Indirect water heater sensor (optional)
Neutral
120Vac hot
Heating pump (see
piping diagram of
Figure 7-7)
Indirect water heater
pump (see piping
diagram of Figure 7-7)
Isolation relay