Heat Link 31360, Manual

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HeatLink
®
Mixing Valve Reset Control Stk# 31360
®
Link Heat
www.heatlinkgroup.com
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Mixing Operation
System Pump Operation (Sys Pmp)
The system pump contact (Sys Pmp, terminal 5) closes whenever there is a mixing demand and the Stk# 31360 is not in WWSD. The system
pump segment is displayed in the LCD. After the mixing demand has been satisfied, the Stk# 31360 continues to operate the system pump for 20
seconds. This allows some residual heat to be purged out to the heating system. During WWSD, the system pump is operated based on the exercise
function.
Mixing Demand
A mixing demand is required in order for the Stk# 31360 to provide heat. A mixing demand is
generated by applying a voltage between 24 and 240 V (ac) across the Mixing Demand terminals
(1 and 2). Once voltage is applied, the Mixing Demand pointer is displayed in the LCD. If the
Stk# 31360 is not in WWSD, the Stk# 31360 closes the Sys Pmp contact. The Stk# 31360 calculates
a MIX TARGET supply temperature based on the outdoor air temperature and settings. If required,
the Stk# 31360 operates the boiler in order to provide heat to the mixing valve.
1 2
Mixing
Demand
24 to 240 V (ac)
North American Version
Parallel Shift
Using the
ROOM Settting
down
Outdoor Air Temperature
Supply Water Temperature
up
Starting Point
(Fixed)
End Point
By Changing
the Mix Design
and the Outdoor
Design settings
the Reset Ratio
changes
70˚F
(21˚C)
70˚F (21˚C)
Outdoor Air Temperature
Supply Water Temperature
Reset Ratio
The reset ratio requires two points to establish the rate at which the mix supply water temperature
is to be increased for every degree that the outdoor air temperature falls. The starting point of the
reset ratio is fixed at 70˚F (21˚C). The end point can be changed using the OUTDOOR DESIGN
and the MIX DESIGN settings.
Outdoor Design (OUTDR DSGN)
The OUTDR DSGN is the outdoor air temperature that is the typical coldest temperature of the year where the building is located. This temperature
is used when doing heat loss calculations for the building. If a cold outdoor design temperature is selected, the mix supply temperature rises
gradually as the outdoor temperature drops. If a warm outdoor design temperature is selected, the mix supply temperature rise rapidly as the
outdoor temperature drops.
Mix Design (MIX DSGN)
The MIX DSGN temperature is the supply water temperature required to heat the mixing zones when the outdoor air is as cold as the OUTDR
DSGN temperature.
Room Occ & Unocc (ROOM)
The Room setting is the desired room temperature for the mixing zones, and it provides a parallel
shift of the Reset Ratio. If the room temperature is not correct, adjusting the Room setting increases
or decreases the amount of heat available to the building. A Room setting is available for both the
occupied and unoccupied modes.
Mix Maximum (MIX MAX)
The MIX MAX sets the highest water temperature that the control is allowed to calculate as the MIX TARGET temperature. If the control does
target the MIX MAX setting, and the MIX temperature is near the MIX MAX, the MAX segment will be displayed in the LCD while either the
MIX TARGET temperature or the MIX temperature is being viewed.
Mixing Operation (North American Version)