tekmar 364 Universal Reset Control Installation - Manual (Page 4)

© 2001 D 364 - 07/01 4 of 36
POWERING UP THE CONTROL
When the Universal Reset Control 364 is powered up, the control displays the control type number in the LCD for 2 seconds. Next,
the software version is displayed for 2 seconds. Finally, the control enters into the normal operating mode and the LCD defaults to
displaying the current outdoor air temperature.
TERMINAL UNITS (MIX TERM / Boil TERM)
The 364 uses a Characterized Heating Curve for its outdoor reset calculations of the supply water temperature. When using a
Characterized Heating Curve, the control requires the selection of a terminal unit. The terminal unit determines the shape of the
Characterized Heating Curve according to how the terminal unit delivers heat into the building space. The 364 provides for selec-
tion between six different terminal unit types: High Mass Radiant, Low Mass Radiant, Fancoil, Fin-Tube Convector, Radiator and
Baseboard.
Hydronic Radiant Floor (HRF1)
HRF1 is a heavy, or high mass, hydronic radiant floor system. This type of a hydronic
radiant floor is embedded in either a thick concrete or gypsum pour. This heating
system has a large thermal mass and is slow acting.
Hydronic Radiant Floor (HRF2)
HRF2 is a light, or low mass, hydronic radiant floor system. Most commonly, this type
of radiant heating system is either attached to the bottom of a sub floor, suspended
in the joist space, or sandwiched between the sub floor and surface. This type of
radiant system has a relatively low thermal mass and responds faster than a high
mass system.
Fancoil (COIL)
A fancoil terminal unit or air handling unit (AHU) consists of a hydronic heating coil
and either a fan or blower. Air is forced across the coil at a constant velocity by the fan
or blower and is then delivered into the building space.
Fin-tube Convector (CONV)
A convector terminal unit is made up of a heating element encased in fins. This type
of terminal unit relies on the natural convection of air across the heating element to
deliver heated air into the space. The amount of natural convection is dependant on
the supply water temperature to the heating element and the room air temperature.
Radiator (RAD)
A radiator terminal unit has a large heated surface that is exposed to the room.
A radiator provides heat to the room through radiant heat transfer and natural
convection.
Baseboard (BASE)
A baseboard terminal unit is similar to a radiator, but has a low profile and is installed
at the base of the wall. The proportion of heat transferred by radiation from a base-
board is greater than the proportion transferred by natural convection.
Sequence of Operation
Section A: General
Section A
General
Page 4-5
Section B
Boiler Zones
Page 5-6
Section C
Domestic Hot
Water/Setpoint
Page 6-9
Section D
Mixing Zones
Page 9-11
Section E
Snow
Melting
Page 12-14
Section F
Boiler
Operation
Page 15-16