tekmar 364 Universal Reset Control Installation - Manual (Page 11)

11 of 36 © 2001 D 364 - 07/01
EXTERNAL MIXING DEMAND
An external mixing demand allows for the use of a conventional thermostat system for
zoning. An external mixing demand is generated by applying a voltage between 24 and
240 V (ac) across the Mix Demand terminals (1 and 2). Once voltage is applied, the Mix
Demand pointer is displayed in the LCD. If the 364 is not in WWSD, the 364 closes the
Mix Sys Pmp P3 contact. The mixing system pump segment is displayed in the LCD. The
364 calculates a MIX TRG temperature based on the outdoor air temperature and set-
tings. If required, the 364 operates the Boiler contact as described in section E in order
to provide heat to the mixing device.
10K INDOOR SENSOR (MIX 10K = INDR)
Set the MIX 10K item to INDR to add an indoor sensor for tempera-
ture control of a single zone mixing system. The indoor sensor is con-
nected to the Com and Mix 10K terminals (20 and 21). In addition,
power must be applied to the Mix Demand terminals (1 and 2). With
the indoor sensor connected, the 364 is able to sense the actual room
temperature. With this information, the 364 provides more constant
water flow through the mixing system. At the same time, indoor feed-
back fine tunes the supply water temperature in the mixing system to
prevent over heating or under heating. To adjust the room temperature
for the mixing zone, use the MIX ROOM setting in the Adjust menu at
the control.
10K ZONE CONTROL (MIX 10K = ZOIN)
Set the MIX 10K item to ZOIN to add indoor temperature feedback
control of multiple mixing zones. Control of mixing zones is provided
by connecting a tekmar zone control to the 364. The zone control pro-
vides its own internal mix demand to the 364. In this case, there is no
need to provide an external mix demand. The zone control is capable
of automatically adjusting the MIX TRG temperature to improve build-
ing occupant comfort and system performance.
10K SLAB SENSOR (MIX 10K = SLAB)
Set the MIX 10K item to SLAB to add a slab sensor for temperature
control of a single zone mixing system. The 364 can use a slab sensor
to control the actual slab temperature. A slab sensor is placed in the
slab and connected to the Com and Mix 10K terminals (20 and 21).
Power must be applied to the Mix Demand terminals (1 and 2). With
the slab sensor connected, the 364 will limit the mixing supply tem-
perature in order to maintain the slab sensor between the SLAB MIN
and SLAB MAX settings.
Slab Minimum (SLAB MIN)
The SLAB MIN sets the minimum allowed core temperature of the
slab as long as the control is not in WWSD. Caution should be used
when adjusting the SLAB MIN setting as this may lead to overheat-
ing of the zone during mild conditions.
Slab Maximum (SLAB MAX)
The SLAB MAX sets the maximum allowed core temperature of the
slab. If the slab is to be maintained at a fixed core temperature, set
the SLAB MAX and SLAB MIN items to the same setting.
Section D3: Mixing Demands
Mix
1
Demand
2
24 to 240 V (ac)
Mix Demand Boiler Demand DHW Demand Setpoint Demand WWSD Min / Max Melting
Universal Reset Control 364 Mixing, Boiler & DHW 158033
Menu Item
tekmar
Indoor Sensor
tekmar
364 Control
Mix Demand Boiler Demand DHW Demand Setpoint Demand WWSD Min / Max Melting
Universal Reset Control 364 Mixing, Boiler & DHW 158033
Menu Item
tekmar
Zone Control
tekmar
364 Control
tekmar
Slab Sensor
tekmar
364 Control
Mix Demand Boiler Demand DHW Demand Setpoint Demand WWSD Min / Max Melting
Universal Reset Control 364 Mixing, Boiler & DHW 158033
Menu Item