HTP EFT-80 Installation, Start-Up, Maintenance, Parts, Warranty

LP-387 Rev. 7.3.15
39
E. Alarm Connections
The control includes a dry contact alarm output. This is an SPDT
circuit, rated at 5 amps at 120 volts. This contact can be used to
activate an alarm light or bell or notify a building management
system if the boiler goes into a lockout condition. The circuit
between the ALARM COM and NC terminals is closed during
normal operation and the circuit between ALARM COM
and NO is open during normal operation. The connections
depicted in Figure 29 show two 120 volt lights connected to
the alarm terminals. One light will be on when the boiler is in
normal mode and the other light will be on when the boiler is
in lockout mode.
connections shown are suitable for a maximum continuous
pump draw of 3 amps at 120 volts. If the pump requires more
current or voltage than the 120 volts supplied, an external
motor starter or contactor will be required.
F. Low Voltage Connections for Standard Boiler
1. All low voltage cables should enter the electrical junction
box through the provided knock out holes as shown in Figure
28.
2. Connect all low voltage eld devices to the low voltage
terminal strip located in the electrical junction box.
G. Thermostat
1. Connect the room thermostat to the terminals marked
THERMOSTAT in the electrical junction box (see Figures 29
and 32). Alternately, any dry contact closure across these
terminals will cause the boiler to run. Take caution to ensure
neither of the terminals becomes connected to ground.
2. Mount the thermostat on an inside wall as central as
possible to the area being heated, but away from drafts or heat
producing devices such as television sets that could inuence
the ability of the thermostat to measure room temperature.
3. If the thermostat is equipped with an anticipator and it is
connected directly to the boiler, the anticipator should be set
at .1 amps. If the thermostat is connected to other device(s),
the anticipator should be set to match the power requirements
of the device(s). See the instruction manual of the connected
device(s) for further information.
H. Outdoor Sensor
There is no connection required if an outdoor sensor is not
used or the system requires a xed operating temperature.
1. Use a minimum 22 AWG wire for runs of 100 feet or less and
minimum 18 AWG wire for runs of up to 150 feet.
2. Mount the outdoor sensor on an exterior surface of the
building, preferably on the north side in an area that will not
be aected by direct sunlight and will be exposed to varying
weather conditions.
NOTE: For correct mounting procedures, follow instructions
provided with the sensor.
NOTE: If sensor wires are located in an area with sources of
potential electromagnetic interference (EMI), the sensor
wires should be shielded, or the wires routed in a grounded
metal conduit. If using shielded cable, the shielding should be
connected to the common ground of the boiler.
Figure 29 - Control Wiring
I. Indirect Sensor
There is no connection required if an indirect water heater is
not used in the installation.
1. The boiler will operate an indirect red water heater with
either a thermostat type aquastat installed in the indirect
tank or an HTP 7250P-325 tank sensor. When a tank sensor is
used, the boiler control will automatically detect its presence
and a demand for heat from the indirect water heater will be
generated when the tank temperature falls below the user set
point by more than the user selectable oset. The demand
will continue until the sensor measures that the indirect water
heater temperature is above the set point.
2. Connect the indirect sensor (7250P-325) to the terminals
marked DHW SENSOR (shown in Figures 29 and 32) in the
electrical junction box.
Failure to use the correct sensor may result in tank temperature
being either above or below set point, and could result in
decreased performance, substantial property damage, or
heightened risk of injuries due to scalds.
Caution should be used to ensure neither of these terminals
becomes connected to ground. Failure to do so can result in
property damage, personal injury, or death.

HTP EFT-80 Specifications

General

Brand	HTP
Model	EFT-80
Category	Boiler
Language	English