Install Instructions

40
5 Electrical connections
Installation & Service Manual
Shutdown
The Shutdown knob specifies the outdoor air lockout
temperature at which the control would prevent the unit
from operating.
Outdoor Air Max (O.A. Max)
The O.A. Max knob allows a reset up to the maximum
outdoor air temperature specified by this knob setting. When
the outdoor air temperature is above the specified setting,
the unit will not function in the O.A. Reset Mode, but will
continue to run at the selected set point temperature.
Note that the set point knob will now indicate the “minimum”
boiler temperature. Target temperature is determined by
the ratio and outdoor air temperature below the O.A. Max
setting.
Ratio
The Ratio knob allows control over the reset ratio to be used
during Outdoor Air Reset. The allowable ratios are as low as
0.5:1 or as high as 1.5:1.
Selecting the 0.5:1 ratio will increase the set point 0.5°
for every 1.0° drop in outdoor air temperature up to the
maximum set point temperature.
Selecting the 1.5:1 ratio will increase the set point 1.5°
for every 1.0° drop in outdoor air temperature up to the
maximum set point temperature.
If the outdoor design and boiler design temperatures are
known, the Ratio setting can be calculated using the following
formula:
Ratio = (boiler design temperature - operator set point)
(O.A. Max. setting - outdoor design temperature)
Note that the reset set point cannot exceed the maximum set
point of the boiler thermostat.
These settings are illustrated graphically in FIG. 5-7.
Figure 5-7_Outdoor Air Control Example Chart
Outdoor Air Shutdown Enable/Disable Switch
The Outdoor Air Shutdown Enable/Disable switch turns the
outdoor air shutdown feature On and Off. Disabling the
Outdoor Air Shutdown feature allows the unit to operate
regardless of the outdoor air temperature. This is needed for
indirect domestic hot water systems for example.
Additional Temperature Controls
High Water Temperature Limit Con trol
The appliance is supplied with a fixed setting, auto-reset
high water temperature limit control. The setting of this
control limits max i mum discharge water tem per a ture. If water
temperature exceeds the setting, the limit will break the con trol
circuit and shut down the appliance. The limit control will
only be reset after the water tem per a ture has cooled well below
the setting of the limit. The auto-reset high water temperature
limit control is mount ed in the outlet side of the front header.