Mixing Operation; Pump Operation - Tekmar tekmarNet 2 House Control 406 Installation & Operation Manual

Mixing Operation

The House Control 406 operates the variable speed pump output
for mixing. The Variable % bar graph in the "Zones" box of the
status field indicates the approximate speed of the pump.
Status Field
The table below gives a list of manufacturer approved pump
models for the Variable Speed Pump output.
Manufacturer approved pump models for Variable Speed Pump output.
Grundfos (F)
15-42 15-58 26-64 43-75 003 007 0010 0012 NRF
** *** ** ***
*Speed 1,**Speed 2, ***Speed 3
These circulators have been tested and approved by the manufacturer for use with tekmar variable speed electronics.

Pump Operation

The House Control 406 operates six different pump outputs
on the back side of the enclosure. The "Pumps" box in the
status field indicates which pumps are operating at any
given time.
Status Field
Pump Exercising - ------------------------- --- --- --------------------------------
The control operates each pump every three days for 10
seconds to help prevent corrosion and/or precipitate build up
that that would cause the pump to seize. The control ensures
that no heat is supplied to the zones during exercising.
HP Loop Pump - - - - - -- ---------------------- ------ - - - - - - - ----------------------------
The HP Loop Pump operation is explained in Section B.
DHW Pump -- - - - ------ ----------- ------ ----------- ---------------------------------------
The DHW Pump operation is explained in Section F.
Transfer Pump --- ---------------------- ---------- -----------------------------------
The Transfer Pump operation is explained in Section B.
© 2011 D 406 - 12/11
Var
Taco B & G
NRF
9 22
Xfr
42 of 48
Variable Speed Pump
A standard wet rotor circulator can be connected to the Variable
Speed Pump output on the back of the control. The control
varies the circulator speed to maintain the correct mixed supply
water temperature at the mix supply sensor. For heating, the
hot tank water temperature will be mixed down, and for cooling
the chilled tank water temperature will be mixed up.
For correct sizing and piping of the variable speed pump, refer
to essay E 021.
Note: Pumps manufactured with an internal variable speed
controller are not compatible with the House Control.
Armstrong
NRF Astro
33
25BU 30 50
Boiler System Pump -------------------- -- -- -- -- -- ------------------------------
The boiler system pump operates whenever all the
following conditions are met:
• A Boil Call is present and the thermostat calling for heat has
the Heat 1 pump setting set to On.
• OR a Backup Call is present and BACKUP is set to XFER
or VAR.
• OR a DHW Call is present and DHW MODE is set to 3 or 4.
• There is no DHW or Setpoint priority.
• The control is not in Warm Weather Shut Down.
Tank System Pump ----------------------- - -- -- -- - -------------------------------
The Tank System Pump operates whenever all the
following conditions are met:
• A Tank Call is present.
• The thermostat calling for heat has the Heat 1 pump set-
ting set to On.
• The control is not in Warm Weather Shut Down.
Mix System Pump ----------------------- -- -- -- -- - --------------------------------
The boiler system pump operates whenever all the
following conditions are met:
• A Mix Call is present.
• The thermostat calling for heat has the Heat 1 pump set-
ting set to On.
• The control is not in Warm Weather Shut Down.
Section I
Wilo
Star S16FX Star
* ** *** S21FX 17FX 30F
Section J