tekmar 541 Thermostat - Manual (Page 13)

13 of 24 © 2007 D 541 - 08/07
Cycles Per Hour Section D
You can set the number cycles per hour (CPH) for the
heating operation. The default setting for heating cycles
per hour is automatic.
Heating CPH:
•
• When the thermostat is connected to a tN4 System
Control, the thermostat uses the CPH setting on the
tN4 System Control for the Heating CPH.
• • To manually set the cycles per hour when the thermostat
is not connected to a tN4 System Control, go to the
Adjust menu and select the Heat CPH item.
• • When the thermostat is connected to a tN4 system with
only thermostats, the SYNC setting synchronizes the
operation of all the thermostats to 5 CPH.
Heating Terminal Units Section E
This thermostat supports Outdoor Reset characterized
heating curves when used in hydronic heating systems. By
setting the correct terminal unit setting, the thermostat can
improve the operation of the heating system. Each stage
of heat has its own terminal unit setting.
Control (CTRL)
Selecting Control as the terminal unit setting on the thermostat
causes the thermostat to adopt the tN4 System Control’s
terminal unit setting.
Hydronic Radiant Floor 1 (HRF1)
Terminal type for 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 2 (HRF2)
Terminal type for 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 wood sub floor,
suspended in the joist space, or sandwiched between the
subfloor and the 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 an 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
with fins on it. 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 baseboard
is greater than that from a fin-tube convector.
Other (OTHR)
In applications where a non-hydronic heating system
(furnace, electric baseboard, etc.) is installed, set the
terminal unit to other.