Install Instructions

&IGURE ECO LOWVOLTAGE input and output connections
Low voltage wiring (24 VAC)
Make the following low-voltage connections, some of which
depend on your system and how the ECO control will be
programmed. The callouts below refer to Figure 65.
The ECO control provides inputs for one DHW zone
(priority) and one heating zone.
P11 $(7INPUT$(7CIRCUITONLY
/NLYUSETHE$(7INPUTWHENTHE
SYSTEMUSESA$(7TANKOROTHER
$OMESTIC(OT7ATERPRODUCTIONDEVICE
$ONOTUSEASAHEATINGZONE
1. Cont rol requires that DHW tanks be controlled from
DHW Input if domestic water priority is required.
2. ALWAYS connect DHW aquastat or isolated relay con-
tacts from a DHW device to the DHW input. Depending
on system design, a zone control may be necessary.
5NLESSSYSTEMISEXEMPTBASEDONTHE
CRITERIALISTEDONPAGEINSTALLER
MUSTPROVIDEEXTERNALCONTROLSTHAT
DISTINGUISHBETWEEN!QUASTAT$(7
ANDTHERMOSTAT(%!4CALLSFORHEATIF
EXTERNALCONTROLSARENEEDED
P15 (%!4INPUTCENTRALHEATING
1. Use HEAT input to:
a. Connect the thermostat for a space heating zone.
b. Connect end switch wire (must be ISOLATED
contacts) to start boiler on a call for space heating.
c. Connect system control input for space heating call
for heat (ISOLATED contact only).
The ECO control will activate the 120VAC
(%!4 #IRC
output if the
HEAT thermostat or input device calls for
heat, after DHW heating is satisfied.
P10 /UTDOORTEMPERATURESENSORFOROUTDOOR
RESET
1. The ECO control provides programmable options if
using an outdoor temperature sensor. This sensor is
supplied with the boiler. 4HEOUTDOOR SENSORMUST
BE INSTALLED UNLESSSPECIlCALLYEXEMPTED IN THE
%NERGY!CTSTATEMENTONPAGE.
2. Mount the outdoor sensor on an exterior wall, shielded
from direct sunlight or flow of heat or cooling from
other sources. The wire outlet on the sensor must be
oriented DOWN to prevent water entry.
3. Connect the sensor leads to the black, 2-pin terminal
block, as shown in the wiring diagrams. Thermostat
wire can be used to connect the sensor.
P13 %XTERNALLIMITS WILLCAUSEMANUALRESET
WHENOPENED
PINS
1. Connect isolated contacts of external limits in series
across pins 1 and 2 of the orange, 4-pin terminal block
to cause the ECO control to lock out (requiring manual
reset) if the limit opens. The limit must close and the
control must be re-started using the procedure given
in this manual.
4HERMOSTATS — $/./4 supply 24-volt power to
the thermostat circuits (P11 and P15 in Figure 65) or
attempt to supply 24 volts for any other application.
For thermostats that require a continuous 24-volt
power source, connect the thermostat power input
to “a separate 24V power source.
:ONE VALVES — If using 3-wire zone valves, use
relays to provide dry contacts to the ECO control
thermostat connections. The zone valve end switches
of 3-wire valves carry 24VAC from the valve.
4HERMOSTATANTICIPATORSETTING — 0.1 amps.
P13 %XTERNALLIMITSWILLCAUSEAUTOMATICRESETWHEN
OPENED
PINS
1. Connect isolated contacts of external limits in series across pins
3 and 4 of the orange, 4-pin terminal block to cause the ECO
control to shut down the boiler on limit opening, then automati-
cally restart after the limit closes.
P12 ,OWWATERCUTOFFDEVICEIFUSED
1. If using the optional kit, remove factory jumper from P12. Insert
4-pin molex connector from kit wire harness into P12.
2. To field wire a non-powered (isolated contact) low water cut-off,
clip the factory jumper in the factory installed molex plug, strip
the wires and connect to the LWCO’s isolated contacts
Part number 550-142-122/0513
59
TM
GAS-FIRED WATER BOILER — Boiler Manual
Field wiring (continued)