Installation

9 of 36 © 2001 D 364 - 07/01
Once the boiler supply temperature is sufficiently reduced, the DHW device shuts off. Then the heating system is turned on for a
period of time to prevent the building from cooling off excessively. After a period of heating, if the DHW demand is still present, the
364 shuts off the boiler system pump (P2) and provides heat to the DHW tank once again.
The 364 can handle loads which are high temperature loads connected to the boiler loop that are not heating loads or DHW. For this
feature to be available, the Boil SENS item must be set to SUP and either a DHW sensor must be used or the DHW THRU item is set
to NONE. If an external DHW demand is used as described in Section C1, you can not use the setpoint feature.
SETPOINT DEMAND
A setpoint demand is required in order for the 364 to provide heat to the setpoint load. The
364 registers a setpoint demand when a voltage between 24 and 240 V (ac) is applied
across the Setp / DHW and the Com Dem terminals (5 and 4). Once voltage is applied, the
Setpoint Demand pointer turns on in the LCD. The control operates the boiler to maintain at
least the boiler supply temperature as set by the SETPOINT setting. The setpoint demand
does not turn on the primary pump (P1). If a setpoint load is used, the installer must make
sure that the setpoint device provides its own flow through the boiler.
BOILER TARGET DURING SETPOINT (Boil TRG)
The Boil TRG temperature during a setpoint demand is increased to at least the SETPOINT setting. This temperature is maintained
as long as the 364 has a setpoint demand.
Section C4: Setpoint
Section D: Mixing Zones
The Universal Reset Control 364 is capable of providing a reset supply water temperature from the primary boiler loop to a secondary
mixed loop using a mixing device. The mixing zones that are piped into the mixed loop and receive a mixed supply temperature. The
mixing supply temperature is determined using a Characterized Heating Curve. In order to set up a Characterized Heating Curve, the
following information must be entered into the control using the Adjust menu.
OUTDOOR DESIGN (OUT DSGN)
The OUT 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.
MIXING 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 OUT
DSGN temperature.
MIXING MAXIMUM (MIX MAX)
The MIX MAX sets the highest water temperature that the control is
allowed to use as a MIX TRG temperature. If the control does target the
MIX MAX setting, and the MIX SUP temperature is near the MIX MAX
temperature, the Min / Max pointer turns on in the LCD while either the
MIX TRG temperature or the MIX SUP temperature is viewed.
WARM WEATHER SHUT DOWN (WWSD)
When the outdoor air temperature rises above the WWSD setting, the
364 turns on the WWSD pointer in the display. When the control is
in Warm Weather Shut Down, the Mix Demand pointer is displayed
if there is a demand. However, the control does not operate the heat-
ing system to satisfy this demand. The control does respond to either
a DHW demand or a setpoint demand and operates as described in
Section C.
Section D1: General
Section D1
General
Section D2
Mixing
Devices
MIX MAX
MIX DSGN
OUT DSGN
WWSD
MIX ROOM
210
(99)
190
(88)
170
(77)
150
(66)
130
(54)
110
(43)
90
(32)
70
(21)
50°F
(10°C)
-20
(-29)
0
(-18)
20
(-7)
40
(5)
60
(16)
80
(27)
Outdoor Air Temperature
Supply Water Temperature
Mixing Characterized
Heating Curve
Mixing Characterized
Heating Curve
MIX MIN
MIX INDR
Com
4
Dem
Setp/
5
DHW
24 to 240 V (ac)
Section D3
Mixing
Demands