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5
Electrical connections
Alarm contacts
The SMART SYSTEM control closes another set of contacts
whenever the heater is locked out or the power is turned off.
This can be used to turn on an alarm, or signal a Building
Management System that the pool heater is down.
Wiring of the cascade
When wiring the heaters for Cascade operation, select one
heater as the Leader. The remaining heaters will be designated
as Members. See page 51, Configuration of the Cascade for a
detailed explanation of this procedure.
The return sensor of the Leader heater should be placed in the
main system piping loop, upstream of the water being supplied
to all the heaters (see FIG.'s 4-5, 4-6, and 4-7). The return
sensors on the remaining Member heaters may also be placed
in the same location as the Leader or they can be placed in each
Member's PVC piping loop in the Alternate sensor location,
using the tapped sensor hole (FIG. 4-3). Should the Leader
heater ever need to be replaced with one of the Member heaters
in the Cascade, that Member's sensor should be relocated to
the previous lead heater's supply sensor location for optimum
operation of the cascaded units.
The supply/limit sensors of all cascaded heaters MUST be
placed downstream, in the main system piping loop in the
blended water, going out to the pool (FIG.'s 4-5, 4-6, and 4-7).
The supply/limit sensor also serves as a high temperature limit
for pool supply water and failure to locate all sensors in the
blended water going out to the pool could result in higher
temperature water than desired being discharged to the pool.
If an external thermostat or BMS is being used to enable or
disable the cascaded heaters, the external thermostat or BMS
should be connected to the Leader heater's S1 input, located on
the low voltage terminal board (see FIG. 5-5). Jumpers on all
Member heaters should be left in place.
Communication between the Leader and the Member
heaters is accomplished by using shielded, 2-wire twisted pair
communication cable. Connect one of the twisted pair wires
to terminal A on each of the low voltage connection boards,
and the other wire of the twisted pair to terminal B on each of
the low voltage connection boards. Connect the shield wire to
the shield ground terminal on all of the heaters. If more than
two heaters are on the Cascade, daisy chain the wiring from
the Cascade terminals on the second heater to the Cascade
terminals on the third heater, then from the third to the
forth, and so on. The connections can be made in any order,
regardless of the addresses of the heaters. Try to keep each cable
as short as possible.
Installation & Operation Manual
(continued)
Figure 5-5_Low Voltage Field Wiring Connections
TO MONITORING DEVICE
TO MONITORING DEVICE
THREE WAY
VALVE
THERMOSTAT
LOUVER
PROVING
SWITCH
LINE
TO LOUVER
LOUVER RELAY
24VAC COIL
FIELD PROVIDED
10K-TANK
SENSOR
FROM
A
PREVIOUS
B
HEATER
A
TO NEXT
B
HEATER
EXTERNAL
SEQUENCER/
BUILDING
SHIELD
AUTOMATIC
A
CONTROL
B
TO NEXT BOILER
POOL SAFETY
SUPPLY
10K/20K
POOL/BOILER
10K
1
ALARM
2
CONTACTS
3
RUN-TIME
4
CONTACTS
5
OPEN
6
CLOSE
7
COM
REMOTE
8
S1
9
S1
/EMS
10
S2
N/A
11
S2
12
S3
N/A
13
S3
14
S4
N/A
15
S4
16
LOUVER
17
PROVING SW
18
LOUVER
19
RELAY COIL
20
TANK
21
AQUASTAT
CN3
22
TANK
23
SENSOR
24
SHIELD
25
A
26
B
27
SHIELD
28
+ 0-10V
29
- BMS IN
30
+ 0-10V
31
- RATE OUT
OPTIONAL MODBUS
32
SHIELD
33
A
OPTIONAL MODBUS
34
B
35
SHIELD
CN2
SHIELD
A
B
BK
1
20K
G
2
R
3
10K
W
4
5
10K
6
7
8
CN2
POOL
SUPPLY
SENSOR
POOL
RETURN
SENSOR
NOT
USED
IMG01158
47
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