Weil-McLain WM97+ Aqua Logic, Руководство пользователя

Страница: 59 / 108

Part number 550-142-058/0811
59
WM97+
gas
-
fired water boiler
— Boiler Manual
HEAT SETTINGS menus
(continued)
HEAT SETTINGS
1. The heat settings menus are for setting control operation during space
heating. The settings apply to all space heating zones.
2. When DHW is used, the settings for control operation during DHW
calls is set under the DHW SETTINGS menus (see Figure 66, page 61).
SYSTEM TYPE
1. Select the appropriate system type, based on the heating terminal units
in the system. Use the CUSTOM selection to set the control module
for a different system type.
2. The temperature presets are chosen based on normal best setting for
the terminal units. The temperature values can be changed, if desired,
under “TEMPERATURES.”
BOILER CIRCULATOR SPEED
1. The boiler circulator speed can be chosen as needed for the flow re-
quirements of the installation.
PRIMARY/SECONDARY operation
(boiler internal by-pass
valve OPEN) — For most applications operating as primary/
secondary, set the boiler circulator speed to LOW. If the
temperature rise through the boiler is not acceptable at this
flow, increase the speed to MED. Temperature rise should
preferably be 30°F.
2. The LED on the circulator flashes based on speed (on constantly at
high speed).
TEMPERATURES (HEATING DESIGN
TEMPERATURES)
1. Set desired temperatures for space heating zones.
2. For an explanation of the target temperatures and associated outdoor
temperatures, see Figure 64.
MAX SUPPLY
1. Set MAX SUPPLY to the required supply water temperature for the
system at design maximum heat loss (typically 180°F for finned tube
baseboard on new installations).
MIN SUPPLY
1. MIN SUPPLY should equal the desired minimum supply water tem-
perature for the system.
2. The factory default is 130°F. This could be set as low as 70°F, which
would supply “zero heat” when outdoor temperature is 70°F, because
supply water temp would equal room temp.
3. See examples in Figure 64.
MAX OUTDOOR
1. MAX OUTDOOR means the outdoor temperature at which the target
temperature reaches its minimum (MIN SUPPLY).
2. In the example of Figure 64, this occurs at 70 °F (the factory default).
MIN OUTDOOR
1. MIN OUTDOOR means the outdoor temperature at which the target
temperature reaches its maximum value (MAX SUPPLY).
Figure 64 Typical outdoor reset curves
2. In the example of Figure 64, this occurs at 0°F
outside (the factory default setting).
3. MIN OUTDOOR should equal the ODT (outdoor
design temperature) for the installation’s location.
MODULATE ON DIFF
1. The temperature must drop this many degrees
below target temperature for the boiler to come on
when a call for heat is present.
MODULATE OFF DIFF
1. While the boiler is firing, as the temperature in-
creases above the target temperature, the boiler
firing rate is reduced.
2. At this many degrees above the target temperature,
the boiler shuts down.
TIMES (HEATING TIMES)
MIN ON TIME
1. This is the minimum time the boiler will satisfy the
call for space heating before switching to DHW (if
there is a DHW call).
BOOST INTERVAL
1. This applies when in outdoor reset mode (outdoor
sensor installed).
2. The boost timer starts on a call for heat. If the boost
interval time passes and the call for heat is still on,
the control module “boosts” the calculated target
outlet water temperature by 10°F.
3. This occurs again if another boost interval elapses.
CONTINUED ON NEXT PAGE