Installation & Operation Manual
5 Electrical connections (continued)
Low voltage connections
1.Route all low voltage wires through the knockouts on the left side of the heater, as shown in FIG.
Louver relay
When the heater is to control combustion air louvers, a field provided 24VAC louver relay must be installed. Connect the Louver Relay Coil terminals to the louver relay coil.
2.Connect low voltage wiring to the low voltage connection board as shown in FIG.
LOW
VOLTAGE
KNOCKOUTS
LINE
VOLTAGE
KNOCKOUTS
Figure
EMS or remote thermostat connection
An EMS, remote thermostat or other remote temperature control may be connected to the pool heater (see FIG.
Ensure that all wiring used to connect the switching contacts of the remote temperature controller to the connection board are a minimum of 18 gauge and have a maximum installed length of 300 feet (91.4m). Set the SMART SYSTEM control to a set point temperature slightly higher than the setting of the remote temperature control. This will ensure that the remote temperature controller functions as the operating control for the heater.
Louver proving switch
The operation of a louver proving switch needs to be verified before the pool heater fires. Remove the jumper wire from these terminals and connect them to the normally open contacts on its proving switch (FIG.
Pool return sensor - 2-wire
The pool return sensor should be installed into the return of the primary loop, making sure it is immersed in the water flow. The SMART SYSTEM control regulates the pool heater firing rate to maintain the system return temperature to the desired set point for the pool.
Pool supply/limit sensor - 4-wire
The pool supply/limit sensor should be installed into the supply of the primary loop, making sure it is immersed in the water flow. The SMART SYSTEM control limits the pool heater firing rate to maintain the system supply temperature. Factory default for the limit temperature is 110°F (43°C).
Runtime contacts
The SMART SYSTEM control closes a set of dry contacts whenever the burner is running. This is typically used by Building Management Systems to verify that the pool heater is responding to a call for heat.
3-way valve out
An electric
0 - 10V rate out
A 0 - 10VDC signal is available to allow a Building Management System (BMS) to monitor the firing rate of the heater. Make sure the
(+) or Vdc terminal of the external control.
REMOTE
ON/OFF
CONNECTION
Figure
Building Management System (BMS)
1. An external control may be connected to control either the firing rate or the set point of the pool heater. Connect the 0 - 10 VDC terminals to the 0 - 10 VDC output of the external control. The SMART SYSTEM control can be programmed to use the enable output of the BMS, or use the voltage signal to enable the heater. A BMS or a remote thermostat can be connected to the S1 terminals to enable or disable the unit in place of the factory provided jumper wire.
2. Make sure the ground terminal is connected to the ground output terminal of the external control, and the 0 - 10 V BMS IN terminal is connected to the 0 - 10 VDC terminal of
the external control.
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