Testing the control – tekmar 370 House Control User Manual

Page 16

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Mixing — Boiler

If a variable speed injection pump is used for mixing reset, the DIP switch must be set
to

Mixing. If mixing is not required (no variable speed injection pump), set this DIP

switch to

Boiler. Refer to Sequence of Operation for setting the Boiler Return / Boiler

Supply.

Occ / UnOcc — Occ. Only

Each zone can be selected to operate in either Occupied only mode or in both Occupied
and UnOccupied modes. If the DIP switch is set to

1,2 Occ. only, the zones connected

to relays

1 and 2 remain in the Occupied mode at all times. If the DIP switch is set to

1,2 Occ / UnOcc, zones 1 and 2 are switched into UnOccupied mode each time the 370
receives an UnOccupied signal. Zones

3 and 4 can be individually selected for

Occupied only or both UnOccupied and Occupied mode operation.

Optimum Start

The Optimum Start / Stop feature is used during transitions between the UnOccupied
mode (Night Setback) and the Occupied mode. When the DIP switch is set to

Optimum

Start, the 370 raises the building temperature during the final stages of the UnOccupied
period. This helps ensure the building is at the Occupied temperature as soon as theb
Occupied period begins. If the Optimum Start DIP switch is set to

Off, the 370 does not

start raising the building temperature until the UnOccupied period ends. More informa-
tion on the Optimum Start feature is provided on page 5 of this brochure.

Thermal Motor

Zone valves with thermal actuating motors have long opening and
closing times. In order for the 370 to compensate for these longer
times, the DIP switch should be set to

Thermal Motor. If fast acting

electric motor zone valves or zone pumps are used, the DIP switch
must be set to

Off.

DHW during UnOcc.

If the DHW tank requires heating during the UnOccupied mode, the DIP switch should
be set to

DHW during UnOcc.. When this DIP switch is set to Off, the 370 ignores all

DHW Demands during the UnOccupied period.

DHW Priority

It is often desirable to temporarily suspend the flow of heat to the heating system when
there is a DHW Demand. As described on page 3, it is important to consider the relative
thermal mass of the heating system and the pick-up time of the DHW tank before using
DHW Priority.

If the DIP switch is set to

DHW Priority, the 370 dedicates the boiler entirely to heating

the DHW tank. If the

DHW Priority DIP switch is set to Off, both the DHW tank and the

heating system can simultaneously demand heat from the boiler.

DHW Valve / DHW Pump

If a valve is used to transfer heat to the DHW tank, the DIP switch should be set to

DHW

Valve. If a pump is used to transfer heat to the DHW tank, the DIP switch should be set
to

DHW Pump. During DHW operation, the system pump is also turned on if the DIP

switch is set to

DHW Valve.

Zone 1 Cooling / Zone 1 Heating

The zone

1 relay can be used to control a heating zone or to operate a cooling system.

If zone

1 is to be used for a heating zone, the DIP switch must be set to Zone 1 Heating.

If zone

1 is used for cooling, the DIP switch must be set to Zone 1 Cooling.

Testing the Control

STEP SEVEN

OPERATIONAL TEST OF CONTROL FUNCTIONS

The House Control 370 has a test routine which is used to test the main control functions. The 370 continually
checks the sensors and displays an error message whenever a fault is found. See page 19 for the list of error
messages. When the

Test button is pushed, the Test light is turned on. The WWSD, Maximum Supply,

Minimum Boiler and Optimum Start / Stop lights are turned off and the individual outputs and relays are tested
in the following test sequence.

Test

DHW Pump

DHW Valve

Zone 1 Cooling
Zone 1 Heating

Thermal Motor

Off

DHW during UnOcc.

DHW Priority

Off

Occ/UnOcc

Occ. only

Zone

Off

Optimum Start

Boiler Return

Boiler Supply

Boiler

Mixing

Testing