Dhw Config - Slant/Fin CHS-85 Instructions Manual

│Controller and Display
Slant Fin Corp.

2.4.2 DHW Config

DHW Config
Demand switch
Mod sensor
DHW setpoint
Off hystersis
On hysteresis
Demand ON temp
Demand OFF temp
Table 2-9 DHW-Domestic Hot Water Configuration Parameters
Parameter Description
Select which sensor is the DHW demand source:

DHW switch
Demand

DHW Sensor with On/Off Temp
†
switch *
(If "DHW Sensor with On/Off Temp is selected, a tank sensor must be used to
generate a demand.)
Select the DHW modulation sensor:
Mod

Outlet
sensor *

Inlet
Setpoint for DHW modulation. If "Mod sensor" is set to "DHW" or "Inlet", reduce
DHW
setpoint setting accordingly. Range 60°F to 190°F
Value added to "DHW setpoint" to determine water temperature at which the burner
Off
will shut off e.g. if "DHW setpoint" is 180°F, and "Off hysteresis" is 10°F, the
hysteresis *
burner will be shut off at 190°F. Range 5°F to 70°F
Value subtracted from "DHW setpoint" to determine water temperature at which the
On
burner will fire e.g. if "DHW setpoint" is 180°F, and "On hysteresis" is 10°F, burner
hysteresis *
ignition occurs at 170°F. Range 2°F to 40°F
Time period during which a DHW demand has priority. If override time has elapsed,
Priority
the boiler and CH pump (Pump C) will service a CH demand regardless of DHW
time *
demand. Value=0 inhibits DHW priority. Range 0 to 18 hours.
DHW demand is switched ON when DHW tank temperature is < this setting.
Demand
Applied when "Demand switch" is set to "DHW Sensor with on/off temperatures".
ON temp *
Range 60°F to 165°F.
DHW demand is switched OFF when DHW tank temperature is ≥ this setting.
Demand
Applied when "Demand switch" is set to "DHW Sensor with on/off temperatures".
OFF temp *
Range 65°F to 170°F.
* = Password protected
†
= If "Demand switch" is set to "DHW Sensor with On/Off Temp", demand is determined by the Demand ON and OFF temp settings.
DHW tank sensor MUST be used in conjunction with a DHW temperature safety shutoff
switch. Failure to provide such a switch may result in property damage, serious injury to
occupants, or possibly death.
14
Figure 2-13 Domestic Hot Water Configuration Screen
DHW Config – menu screen, accessed by selecting
"DHW Config" from the "Advanced Setup" screen, lists
the configuration parameters specific to boiler operation
DHW switch
for a DHW demand.
Outlet
buttons to navigate the menu options; when the desired
o
180 F
option is highlighted select by pressing the "OK" button.
o
10 F
o
10 F
o
135 F
o
140 F
Use the up and down (▲▼)
Demand switch - DHW demand can be initiated by a
contact closure, "DHW switch", or by a tank
temperature sensor, "DHW Sensor with On/Off Temp".
Mod sensor – The control can be set to use the "Outlet"
or "Inlet" sensor for regulation of burner modulation.
When "Demand switch" is set to
"DHW Sensor with On/Off
Temp", demand is determined by
the Demand ON and OFF temp settings.
CHS Series
Factory Settings
DHW switch
Outlet
180°F
10°F
10°F
2 hour
o
135 F
o
140 F