39
Installation & Operation Manual
7
Electrical connections
(continued)
DIR #2000533939 00
LINE 1 BK
SERVICE SWITCH
GROUND G
NEUTRAL W
SYSTEM PUMP
DRY CONTACT
BOILER PUMP
DRY CONTACT
DWG PUMP
DRY CONTACT
CONTACTOR
(FIELD SUPPLIED)
LINE 2 BK
SERVICE SWITCH
Figure 7-1A_Line Voltage Field Wiring Connections_
Models 2500 - 3000
Low voltage connections
1. Route all low voltage wires through the knockouts in the
rear of the heater, as shown in FIG. 7-2.
2. Connect low voltage wiring to the low voltage connection
board as shown in FIG. 7-4 on page 41 of this manual and
the heater wiring diagram.
EMS or remote thermostat connection
An EMS, remote thermostat or other remote temperature
control may be connected to the boiler (see FIG. 7-3). Follow
the manufacturer’s instructions supplied with the remote
temperature control for proper installation and adjustment.
Connection of a set of dry switching contacts or a remote on/off
thermostat to the low voltage connection board will allow the
unit to be switched on and off by making or breaking a 24 VAC
control circuit. Remove the factory jumper between the enable
terminals on the low voltage connection board and connect the
remote temperature control in its place, see FIG. 7-4 on page 41.
DIR #2000529363 00
REMOTE ON/OFF
WIRE CONNECTION
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 TOUCH 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.
Figure 7-3_Remote ON/OFF Wire Connection
DIR #2000529359 00
LOW VOLTAGE
WIRING KNOCKOUTS
Figure 7-2_Routing Field Wiring
DIR #2000534149 00
LINE 1 BK
SERVICE SWITCH
GROUND G
NEUTRAL W
SYSTEM PUMP
DRY CONTACT
BOILER PUMP
DRY CONTACT
DWG PUMP
DRY CONTACT
CONTACTOR
(FIELD SUPPLIED)
LINE 2 BK
SERVICE SWITCH
LINE 3 BK
SERVICE SWITCH
Figure 7-1B_Line Voltage Field Wiring Connections_
Models 3500 - 5000
Note:
Models 3500 - 4000 use 208 VAC 3
. The 5000 model
uses 480 VAC 3