14
BOILER OUTLET MAXIMUM
TEMPERATURE
The external sequencer is able to operate the heater
temperature. However, the BOIL OUT MAX setting lim-
its the highest temperature at the heater outlet sensor.
Should the heater outlet setting exceed the BOIL OUT
MAX setting, the stage contacts are opened to shut off
the heater. The heater remains off for the minimum off
time and the heater outlet temperature falls 2º F (1º C)
below the BOIL OUT MAX setting.
INSTALLATION
The following describes field installation:
For field installation, this controller is shipped inside a
water-resistant enclosure. This kit includes a built-in
transformer, an alarm relay, and three terminal blocks
(labeled P1, P2 and P3) with built-in decals describing
the various connections. See Fig. 25 for proper wiring.
Electrical Connections to the
Controller
The installer should test to confirm that no voltage is
present at any of the wires during installation.
Powered Input Connections
System Pump Contact
The Pump terminals (13 and 14 on the controller to
pins 4 and 5 on P3) are an isolated output in the con-
troller. There is no power available on these terminals
from the controller. This output is to be used as a
switch to either make or break power to the system
pump. Since this is an isolated contact, it may switch
voltage up to 120 VAC that does not to exceed 5
amps. For larger pumps, a contactor must be used.
NOTE:
BOILER OUT MAX is set using DIP Switch
“A”: OFF = 235°F, ON = 200°F (see Fig. 4).
CAUTION:
The 120VAC connection must be
applied to Terminal Block P3 (pins 1 and 2). Pin 3
must be connected to Ground.
Fig. 20: Stage Actuation and Dead Bands
