Tekmar 371 House Control User Manual

1D 37107/96The House Control 371 is a microprocessor-based control that provides individual tempera-ture control for up to 5 zones. Each zone can be e

10Exercising ProcedureThe 371 first exercises the zone valves or pumps. If a zone valve or zone pump has not been operated in the past 3 days, the 371

11DHW DemandIf a DHW demand is used, connect the switched wire from the DHW demand circuit toterminal DHW Dem (23). When 120 V (ac) relative to Neutra

12• If Zone 1 is used for heating (DIP switch set to Zone 1 Heat), connect the wire from the Zone 1 Pump or Valve to theCom 1-2 — 1 (25 and 26) termin

13STEP FIVE TESTING THE WIRING Each terminal block must be unplugged from its header on the control before poweris applied for testing. Pull straight

14BoilerIf a boiler is connected to the terminals Boiler — Boiler (20 and 21), make sure power to the boiler circuit is off and install a jumperbetwee

15Boiler Minimum Supply Most boilers require a minimum operating temperature to prevent corrosion from flue gas conden

16DIP Switch Settings Note Once the control is in operation, the control will not update any changes in theDIP switches unti

17During the test routine, the test sequence can be paused by pressing the Test button. The test sequence remains paused at that pointfor up to 5 minu

18System Pump 2• The relay contacts between Sys P2—Power L (1 and 4) are closed and the mixing system pump (P2)should be running.System Pump 1• The re

19STEP NINE BEFORE YOU LEAVE • Install the wiring cover over the wiring chamber and secure it to the base with the two screws provided. Place the fro

2Control StrategyOUTDOOR RESET In order to properly control a hot water heating system, the heat suppliedto the building must equal the heat lost by t

20House Control 371 Five Zones, DHW, Boiler & MixingLiterature — A 000, A 371's, I 030, E 021, D 371, D 001, D 054, D 070, D 074Control — Mi

3Boiler Differential An on / off boiler must be operated with a differential in order to preventshort cycling. When the supply wate

4DHW Priority OverrideThere is always the possibility of an excessively long DHW call for heat due to a brokenpipe, faulty aquastat or other problems.

5In order to overcome this offset, integral control logic is used. Only digital controls can provide integral control logic due to the lengthyresponse

6Optimum Start / Stop with only Indoor Sensors When only indoor temperature feedback is available, the control must base all Opti

7MIXING OPERATION The 371 can supply a lower water temperature to part of the heatingsystem by varying the speed of an injection pump or modulating a

8PID Zone Temperature Control The 371 operation is based on a 15 minute cycle. During every cyclethe control turns on each zone relay for

9UNOCCUPIED (NIGHT SETBACK) The 371 can be switched into UnOccupied mode through the built-in 24 hr. Timer or byclosing an external switch or timer re