FULTON Endura EDR 750 Nstallation, Operation And Maintenance Manual page 51

INSTALLATION
` DOMESTIC HOT WATER (DHW) TEMPERATURE SENSOR
1. This boiler is capable of providing indirect domestic hot
water through a heat exchanger. A domestic hot water
temperature sensor (PN 4-30-315300) is used for this
application. The boiler is for closed loop applications
only; open loop must not be directly heated by the
boiler.
2. The sensor may be installed in the domestic hot water
constant recirculation supply piping, or the domestic
hot water storage tank.
3. See the Operation section for programming DHW
priority. Refer to the Hydronic PURE Control™ User
Manual for complete instructions.
4. When extending the wire lead, use 18 to 22awg twisted
2 conductor stranded copper with insulated jacket.
Ensure connections are tight with no shorts. Soldered
and heat shrink tubing connections are recommended.
Never use wire nuts to join lead to extension.
5. For complete instructions, refer to the Technical Data
sheet for 4-30-315300 prior to installation.
` MOTORIZED ISOLATION VALVE CONTROL
1. A control relay is provided as standard in the boiler
control panel to operate a two-position motorized
isolation valve. Contacts are rated for up to 30A at 24V
or 120V. The valve type may be either power-open /
power-close, power-open / spring-close, or spring-open
/ power-close. Do not power the actuator using the
boiler control power supplies.
2. A motorized isolation valve is used in variable primary
piping arrangements, in accordance with ASHRAE
90.1-2013, to prevent flow from traveling through idle
boilers.
3. The lead boiler motorized isolation valve must be field
programmed to remain open when all boilers are idle
to provide a path of flow in the hydronic system. See
the Operation section for programming motorized
isolation valve control. Refer to the Hydronic PURE
Control™ User Manual for complete instructions.
Tender No. MET21-117
2-44
` AUXILIARY SAFETY INTERLOCK FOR EXTERNAL DEVICE
1. When the boiler receives a call for heat, the startup
sequence first checks for a completed interlock circuit.
If the circuit is open, the boiler control will not begin
ignition sequence until it is closed.
2. A jumper is factory installed in the interlock circuit. For
applications requiring a safety interlock, this jumper
may be removed with terminals wired into the dry
contacts of an external device.
3. The interlock contacts provide a 24 VDC signal. Do not
apply an external power source to the interlock
contacts; wire only to dry contacts.
4. Typical uses for the safety interlock include but are not
limited to: motorized isolation valve end switches, proof
of exhaust draft assist fan operation, motorized air
intake louvers.
5. Multiple safety interlocks may be used, wired in series.
6. Interlocks may be renamed for simpler troubleshooting.
` VARIABLE SPEED SYSTEM PUMP CONTROL
1. The boiler controller provides start/stop and variable
speed control for two system (secondary) pumps, one
duty plus one backup, with automation rotation. The
pumps cannot be powered directly through the boiler
panel; a variable speed drive (not provided) is required.
2. Pump modulation is provided via a 0-10 VDC output
signal for each pump.
3. The pump start/stop contacts have a maximum rating
of 6 Amps at 120 VAC.
` DEDICATED BOILER PUMP CONTROL
1. Some installations may utilize primary-secondary
piping arrangements instead of variable primary piping
arrangements. In these instances, the boiler (primary)
loop is decoupled from the system (secondary) loop,
and a dedicated boiler pump will be required to provide
flow through the boiler.
2. The boiler controller provides a dedicated boiler pump
start/stop signal only; the pump cannot be powered
through the boiler panel. An external motor starter
or variable speed drive (not provided) is required to
control the circulator pump.
3. The pump contact has a maximum rating of 6 Amps at
120 VAC.
4. Can be modulated only if system pump feature is not
used. A 0-10 VDC output is provided.
Design & Build RFP: Gas Heating Upgrade
Replacement in Dartmouth
SECTION 2
EDR-PURE-IOM-210617
Addendum #5 Page 51 of 105
© Fulton Group N.A., Inc. 2020