heat-timer DiGi-SPAN Elite Series Assembly, Installation And Operation Instructions page 8

Minimum Target
(Available when Startup Control Mode = Outdoor Reset)
Options: From 70ºF/21ºC to 180ºF/77ºC
/Set Point/<Out. Reset>/Min. Tgt
SET
• The Minimum Target Temperature must be set to the system design specification. The HWE-MOV will calculate the Target based
on the Outdoor temperature (OD), the Reset Ratio, and the Offset value. The HWE-MOV will control the motorized valve to hold
either the calculated temperature or the Minimum Target Temperature whichever is higher.
• The Minimum Target Temperature must be at least 20°F lower than the Maximum Temperature (See next setting).
Maximum Target
(Available when Startup Control Mode = Outdoor Reset)
Options: From 90ºF/38ºC to 240ºF/116ºC
/Set Point/<Out. Reset>/Max. Tgt
SET
• This is the highest temperature heating water the HWE-MOV will circulate through the heating system.
• When using a radiation system, it should be set according to the tubing or floor manufacturer's specification.
• The Maximum Temperature must be at least 20°F higher than the Minimum Temperature.
Run-On
Options: From 0 min to 60 min
/Settings>/Run On
SET
• The SYS relay will energize whenever the Outdoor temperature is below the Outdoor Cutoff. When the Outdoor temperature
increases 2°F above the Outdoor Cutoff, the SYS relay will stay on for a period set by the System Run-On. This allows the Pump
to dissipate the residual heat within the system back into the building.
• The System Run-On time should be set based on the size and type of the piping and pumps.
Setback
Options: From 0ºF/0ºC to 80ºF/44ºC
/Settings>/Setback.
SET
• The Setback feature can be used to provide the HWE-MOV with a lower temperature Set Point
when less load is required.
• The lower Set Point will appear on the main display indicating
• For example; when the calculated temperature is 160°F and the Setback is set to 20°F, a setback
call will change the Set Point to (160v - 20°F) 140°F.
• A typical use for Setback is to provide less system temperature to a building during the night or on the weekends when building is
not occupied, but heat is still required.
• The Setback is activated by closing/shorting the P+ and P- terminals using an external timer.
Boost
Options: Yes, No
/Settings>/Setback/Boost.
SET
• The morning Boost is designed to return the building to comfortable ambient temperatures after
the Night (Setback) period. The HWE-MOV will accomplish this by running elevated water
temperatures (will add Setback setting to calculated water temperature) for 30 minutes after
the opening of the setback terminals P+ and P-. That is, if the normal set point at a specific
outdoor was 145˚F and the Setback setting was 20˚F, the boost will raise the system calculated
temperature to 165˚F for 30 minutes after the setback.
System, Outdoor, and Boiler Return Trim
Options: From -20Fº/-11Cº to +20Fº/+11Cº
/<Maintenance>/Sys. Trm, Out. Trim, or Ret. Trim
SET
• The Heat-Timer sensors are very accurate. However, sometime it might be beneficial to adjust
the values to match and existing system. The System and Outdoor Trim values adjust the System
Sensor and Outdoor Sensor readings using positive or negative values.
8
Default: 70ºF/27ºC
Default: 240ºF/116ºC
Default: 2 min
Default: 11ºF/6ºC
.
SBC TGT=
Default: No
Default: 11Fº/6Cº
Min Target:
120 F
Max Target:
200 F
Pump Run-On:
2m
Setback:
20 F
SYSTEM= 68 F
SBC TGT= 140 F
Boost:
No
Yes
System Trim:
+0 F
Outdoor Trim:
+0 F
Return Trim:
+0 F