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

INSTALLATION AND OPERATION INSTRUCTIONS
HWE-MOV DIGI-E
Hydronic Motorized Valve Control
Hot Water Control with Outdoor Reset or Set Point
2 Line Alphanumeric Display
Displays sensor values and
menu settings
Output Lights indicate
output status
®
SYSTEM =
TARGET =
SYS
Boiler
Pump
SET
Display Section Locking Screws
This Heat-Timer control is strictly an operating control;
it should never be used as a primary limit or safety
control. All equipment must have its own certified
limit and safety controls required by local codes. The
installer must verify proper operation and correct any
safety problems prior to the installation of this Heat-
Timer control.
Black (120VAC power)
147F
150F
DHW
Pump
(System Pump Output)
White (Valve Open)
R
Red (Valve Common)
C O R P O R A T I O N
Blue (Valve Close)
WARNING
Elite Series
®
The HWE-Motorized Valve (HWE-MOV) DIGI-SPAN Elite
establishes ambient comfort by varying the temperature of the
heating system's circulating hot water in response to changes
in the outdoor temperature. In addition, it provides an outdoor
temperature based cutoff, heating system pump control. Two
new features have been added to this control including a
customized reset ratio curve. A Set Point option was added
for applications where outdoor reset will not apply.
Two sensors are used, one to monitor the outdoor temperature,
and one to monitor the circulating hot water temperature
Yellow
in the heating system. When the outdoor temperature falls
below outdoor cutoff setting, the heating system is activated
and the hot water temperature is increased proportionally to
satisfy the load. Should it get warmer outdoors, the hot water
temperature is automatically lowered by the control. If the
outdoor temperature continues to rise to the outdoor cutoff
setting then the heating system is turned off.
Because of the many different physical characteristics of
buildings, and the type of radiation, i.e., baseboard or radiant,
the heat loss varies.
change outdoors may require a change of 1 degree in heating
water temperature; for another it may require a change of 2,
3, or even 4 degrees in order to gain the desired comfort level.
This is known as the Reset Ratio. The middle chart shows the
wide range of Reset Ratios available for the HWE-MOV.
The installer fits the HWE-MOV to a specific building by
adjusting the Reset Ratio curve. With curve 4 (2:1 reset ratio)
a 2-degree change in outdoor temperature will change the
circulating hot water temperature by 1 degree; at curve 11
(1:3 reset ratio) an outdoor change of 1 degree will change
the water temperature by 3 degrees. Most buildings with
baseboard radiation require curve 6, 7, or 8. Radiant heat
applications usually require a lower curve. Another, is a
Setback input that will switch the heating system to a lower set
point determined by the Set Back setting
lItE
In one building, a 1-degree temperature
.