User Guide

Part number 550-100-193/0817
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®
CONDENSING GAS BOILER — 70/110/155 Advanced Manual
K. 0–10 VDC Remote TARGET input – OPTIONAL
Terminal Block P15 #5 & #6 (EVG control module)
1. See illustration at right and Figure 15, page 34 (wiring diagram) for details.
2. Remote target using 0–10VDC input requires a 0–10VDC input signal at
P15-5/6 as shown at right.
a. The input positive connection must be at P15 terminal 6 and the common
connection at terminal 5.
b. Using PRIORITY 1, 2, or 3 for single boiler, or LOCAL PRIORITY 1 or
LOCAL PRIORITY 2 for a network boiler.
The 0–10VDC input must be
to that boiler
.
c. Using NETWORK PRIORITY 1 or NETWORK PRIORITY 2 for a net-
work boiler. The 0–10VDC input must be made to the MASTER boiler
of the network
.
3. The illustration at right also shows how to connect TT or end switch contacts
at INPUT 1, INPUT 2 and INPUT 3 of any boiler.
a. If the target controller has a heat demand contact, connect it to one of
the INPUTs and set up in the WIZARD or manually.
b. A dry contact heat demand must be applied to one of the inputs in order
to initiate a call for heat.
4. The 0–10VDC signal is used to adjust the supply target temperature, using
the TARGET ADJUST setting. Set TARGET ADJUST during the WIZARD
or manually in the setup menu for the priority chosen.
5.
Suggested 0–10VDC remote target setup for single boiler or a local
priority
:
a. Use PRIORITY 1 (or LOCAL PRIORITY 1) for the DHW heating circuit
when used. This priority’s default values are set for DHW, direct-con-
nected to the boiler. Verify that settings are suitable for the application,
changing if needed.
b. Use PRIORITY 2 (or LOCAL PRIORITY 2) for the heating circuit that
uses the 0–10VDC input.
s For single boilers, the factory default settings for either of these pri-
orities make them a good choice for space heating applications. Set
priority values to the following:
s Set TARGET ADJUST value to 0–10V.
s Set VOLTS FOR MAX at the voltage that will call for the highest target
temperature. Set SUPPLY MAX at this temperature.
s Set VOLTS FOR MIN at the voltage that will call for the lowest target
temperature. Set SUPPLY MIN at this temperature.
s For voltages between VOLTS FOR MAX and VOLTS FOR MIN, the
target temperature will range proportionately between SUPPLY MAX
and SUPPLY MIN.
s NOTE: The 0–10VDC signal replaces the ODT sensor as the target
temperature modifier (TARGET ADJUST setting). The EVG control
does not control target.
6.
Suggested 0–10VDC remote target setup for a network priority:
a. Setup the control as above, but select NETWORK PRIORITY 2 for the
heating circuit that uses the 0–10VDC input..
b. If a local (direct-connected) DHW circuit is used, select LOCAL PRIOR-
ITY 1 for DHW. If a DHW circuit in the system is used, select NETWORK
PRIORITY 1 for DHW.
See Figure 15, page 34 for details
Field wiring (see wiring diagram, Figure 15, page 34)(continued)