tekmar 370 House Control - Manual (Page 16)

Copyright © D 370 -06/99 16 of 20
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
Off
DHW during UnOcc.
DHW Priority
Off
Occ/UnOcc
1 4 3
Occ. only
2 Zone
Off
Optimum Start
Boiler Return
Boiler Supply
Boiler
Mixing
Testing