Unoccupied (night setback), Timer, 24 hr, Unoccupied switch input – tekmar 371 House Control User Manual

Page 9: Unoccupied temperature, Individual zone selection, Optimum start / stop, System pump operation, Integrated exercising

UNOCCUPIED (NIGHT SETBACK)

The 371 can be switched into UnOccupied mode through the built-in 24 hr. Timer or by
closing an external switch or timer relay wired between the terminals

Com Sen — UnO Sw

(13 & 14) on the control.

Timer, 24 hr.



The 371 has a built-in 24 hr. Timer which can be used to set a single UnOccupied event
during a 24 hour period. The 24 hr. Timer is activated by pushing the

Start button at the

desired starting time for the UnOccupied period. The duration of the UnOccupied period
is set using the

UnOccupied Duration dial. Once the Start button is pushed, the Timer

Active light is turned on and the 371 enters the UnOccupied mode each day at the same
starting time. The 24 hr. Timer can be deactivated by pressing the

Start button again.

A new UnOccupied period starting time can then be selected by repeating the
above procedure.

Note: If an external switch is closed between the terminals

Com Sen — UnO Sw (13 and

14), the 24 hr. Timer is disabled. An external UnOccupied switch and the 24 hr. Timer
should not be used at the same time.

UnOccupied Switch Input



A switch or external timer with a dry relay contact output can be wired between the
terminals

Com Sen — UnO Sw (13 and 14) on the 371. When the switch or relay contact

is closed, the 371 registers an UnOccupied signal. A tekmar Timer 031 is available which
can be programmed to provide UnOccupied schedules for each day of the week with up
to two separate UnOccupied events per day. For more information on the Timer 031, see
the Data Brochure D 031.

UnOccupied Temperature

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When the 371 is in UnOccupied mode, the

UnOccupied light is turned on and the

UnOccupied dial is used to set the desired temperature within the UnOccupied zones.

Note: If the RTU dial for an UnOccupied zone is set below the

UnOccupied dial, the 371

continues to use the RTU dial as the desired temperature within that zone.

Individual Zone Selection

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The DIP switches on the 371 are used to select which zones are switched into
UnOccupied mode. If the DIP switch for a specific zone is set to

Occ / UnOcc, that zone

is switched into UnOccupied mode whenever the 371 receives an UnOccupied signal. If
the DIP switch for a specific zone is set to

Occ. only, that zone remains in the Occupied

mode at all times.

Optimum Start / Stop

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The Optimum Start / Stop feature is enabled when the DIP switch is set to

Optimum Start.

The 371 turns on the

Optimum Start / Stop light each time the first zone enters its delay

or recovery period. Either the tekmar Timer 031 or the built-in 24 hr. Timer on the 371 can
be used with the Optimum Start / Stop feature. The tekmar Timer 031 has a DIP switch
which must be set to

Optimum Start / Stop in order to synchronize the timer with the 371

Optimum Start / Stop function.

SYSTEM PUMP OPERATION

The 371 has two system pump terminals, one for the boiler (hot water) loop,

Sys P1 (1), and one for the mixing (warm water) loop, Sys P2

(2). The

System Pump 1 light is turned on every time the relay contact between terminals Sys P1 — Power L (2 & 4) is closed, and the System

Pump 2 light is turned on every time the relay contact between terminals Sys P2 — Power L (1 & 4) is closed.

The boiler system pump (P1) operates whenever any zone requires heat. The mixing system pump (P2) operates whenever any of the mixing
zones require heat.

This includes any zones in connected tekmar Zone Control. If thermal motor zone valves are used, the mixing and

boiler system pumps (P1 and P2) are held off for the first three minutes of the zone cycle in order to give the zone valve sufficient time to
open. With thermal zone valves the system pumps may also operate for an additional purge period once the zone relays are turned off.

During DHW operation, the 371 turns the boiler system pump (P1) off. For other details of the operation of the system pumps during
DHW operation, see the DHW section on page 7.

If a

Setpoint Demand is provided and the DIP switch is set to Boiler, the 371 does not turn the boiler system pump (P1) or the mixing

system pump (P2) on. If the DIP switch is set to

Mixing, the 371 turns the boiler system pump on, but does not turn the mixing system

pump on.

Integrated Exercising



The zone valves, zone pumps, system pumps, and the mixing device are exercised to help prevent corrosion from building up and
subsequently jamming the equipment. Every three days the 371 runs through an exercising procedure.

Occupied

Optimum Start / Stop

UnOccupied

Timer Active

24 hr. Timer

• Dial the desired duration of the
UnOccupied period.
• Press start button at the time of day
you want the UnOcc. period to begin.
Timer Active light turns on.

Start

0 = always Occupied
24 = always UnOccupied

12 hrs.

UnOccupied

Duration

(21

40
(4)

100

(38)

UnOccupied

1,2

Occ. only

Occ/UnOcc

Permitted

Off

Optimum Start

SCHD

T I M E

AMPM

UNOCC

OVR

WeTh Fr

1
2

Uno

Com

Sen