User Guide

Figure 29 Evergreen
®
single boiler PRIORITY menus (access menus from CONTRACTOR menu
Priority 1 Priority 2 Priority 3
MENU ITEM DESCRIPTION
xxx
INPUTS ASSIGNED
s List of inputs assigned to this priority/system on the local boiler (appears as 1, 2, 3).
xxx
SYSTEM TYPE
s Select the system type for this PRIORITY, based on the heating terminal units in the system.
Use the CUSTOM selection to set the control for a different system type. The factory preset
values for SUPPLY MAX, SUPPLY MIN, OD RESET MAX and OD RESET MIN are chosen
based on the normal best setting for the terminal units. See page 45.
xxx
TARGET MOD
SENSOR
s Select whether boiler modulates based on System Supply sensor or Boiler Outlet sensor.
xxx
TARGET ADJUST
s Select how target temperature is calculated by control: NONE (no reset, fixed target tempera-
ture), 0–10VDC (target temperature based on analog input from remote source), ODT (outdoor
reset operation). This setting cannot be selected if system type is DHW.
xxx
SUPPLY MAX
s Set SUPPLY MAX to the required supply water temperature for the system at design maximum
heat loss (typically 180°F for finned tube baseboard on new installations.)
xxx
SUPPLY MIN
s SUPPLY MIN should equal the desired minimum supply water temperature for the system.
This line will not show if Target Adjust is selected as NONE.
xxx
OD RESET MAX
s Appears if TARGET ADJUST is set to ODT. Outdoor temperature at which the target tempera-
ture reaches its minimum value – usually set at the balance point temperature for the building.
xxx
OD RESET MIN
s Appears if TARGET ADJUST is set to ODT. Outdoor temperature at which the target tem-
perature reaches its maximum value – usually set at the outdoor design temperature for the
installation.
xxx
VOLTS FOR MAX
s Appears if 0–10V is selected for Target Adjust. Set the voltage at which SUPPLY MAX tem-
perature is required.
xxx
VOLTS FOR MIN
s Appears if 0–10V is selected for Target Adjust. Set the voltage at which SUPPLY MIN tempera-
ture is required. For voltages between Min and Max, the target temperature will be adjusted
on a linear curve.
xxx
BOOST TIME
s Every time the call for heat surpasses this duration of time the target temp will increase (boost)
up 10°F to a maximum temperature of SUPPLY MAX.
xxx
SYSTEM OFF DIFF
s This is the amount the temperature must rise above system target to turn the boiler OFF. (This
line does NOT appear if Target Mod Sensor is set to Boiler Out).
xxx
SYSTEM ON DIFF
s This is the amount the temperature must drop below system target to turn the boiler ON.
(This line does NOT appear if Target Mod Sensor is set to Boiler Out).
®
CONDENSING GAS BOILER — 70/110/155 Advanced Manual
Part number 550-100-193/0817
– 54 –
Single Boiler PRIORITY menus
Boiler Model, Altitude and Fuel Type are criti-
cal settings.
Failure to set correctly could result in
severe personal injury, death or substantial property
damage.
1. Access contractor menus by pressing and holding the UP and
DOWN arrow keys at the same time for 7 seconds.
2. See Figure 22, page 46 for the screen sequences up to the
CONTRACTOR menu.