Kanmor Zone Control 369e Manual page 8

HEAT / COOL CHANGEOVER
The changeover between heating and cooling is based on whether or not a display RTU is connected to zone 6 (tN1 6). If a
display RTU is connected to zone 6 (tN1 6), the changeover between heating and cooling is selected at RTU 6. A pointer in the
lower right hand display of the RTU indicates that this RTU is the designated heat / cool RTU. Heat / cool changeover can be
achieved automatically or manually through the RTU. The MODE adjustment in the Adjust menu of RTU 6 allows the selection
between HEAT, COOL, AUTO or OFF. When HEAT is selected at RTU 6, the cooling system is locked out and only heating is
allowed as required. When COOL is selected at RTU 6, the heating system is locked out and all the heating zones assigned to
the cooling group shut off. Cooling is then allowed to operate as required. When AUTO is selected at RTU 6, the changeover
between heating and cooling occurs based on the Cooling Interlock function. Cooling is then allowed to operate as required.
When OFF is selected at RTU 6, zone 6 becomes inactive and cooling operation is disabled. If a display RTU is not connected
to zone 6 (tN1 6), the changeover between heating and cooling is automatic.
COOLING WHILE FLOOR WARMING
The 369e can use a 063e display RTU to provide floor (slab) and air temperature control. The 063e RTU has a built-in air
sensor which is used to control the heating and cooling air temperature, while a slab sensor connected to the 063e RTU con-
trols the floor (slab) temperature. During mild conditions the floor (slab) is maintained at a minimum temperature, and as the
outdoor temperature drops the floor (slab) will rise above the minimum setting and the air sensor takes over. As the outdoor
temperature rises and cooling is required, the control targets the cooling setpoint and the floor (slab) is still maintained at a
minimum temperature.
Note: During mild conditions, it is possible to overheat the space if the fl oor (slab ) is maintained at a minimum temperature.
Section B2: Cooling Control
COOLING ENABLE (ENBL)
The Cooling relay can be used to enable a cooling system, which can
be controlled by a cooling thermostat. The changeover between heat-
ing and cooling is described in the Heat / Cool Changeover section.
COOLING CONTROL (CTRL)
A display RTU connected to zone 6 (tN1 6) can be used to control a heating zone as well as the cooling group. This RTU
is designated as the controlling device for the cooling system. The actual cooling "room" temperature is an average of the
room temperature of all the zones assigned to the cooling group. The desired cooling temperature is set using the COOLING
adjustment in the Adjust menu of RTU 6. When cooling, the 369e varies the on time of the Cooling relay based on a cycle length.
The cooling cycle length is adjustable through the COOL CYC setting in the Control Adjust menu of the control. If COOL CYC
is set to AUTO, the control automatically calculates a cooling cycle length. During every cycle, the control turns on the Cooling
relay for a specifi c on time. The required on time is calculated based on the PID response of the cooling group during the previous
cycle period. If the cooling group requires more cooling, the on time is increased, and if the cooling group requires less cooling,
the on time is reduced. The changeover between heating and cooling is described in the Heat / Cool Changeover section.
Note: If a non-display RTU is connected to tN1 6 or if an indoor sensor is connected to Indr 6, cooling control (CTRL) can not
be selected.
Cooling Unit
© 2003 D 369e - 06/03
Cooling Unit
Display RTU
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Cooling
Thermostat