tekmar 422 Universal Reset Module - Manual (Page 27)

27 of 32 © 2007 D 422 - 08/07
Pump Operation Section K
Primary Pump
The primary pump is switched on in the following
situations:
• • There is a Boiler Demand and that zones thermostat
has H1 Pump set to On.
• • There is a Mix1 or Mix2 Demand.
•
• There is a DHW Demand and the control is set to DHW
Mode 3 or 4.
• • The control is completing a DHW Purge.
•
• There is a Setpoint Demand and the control is set to
Setpoint Mode 3 or Mode 4.
Mix System Pump P1
The mixing pump P1 is switched on only when there is a
Mix 1 Demand and that zone’s thermostat has H1 Pump
set to On.
Variable Speed Pump
The variable speed injection pump output operates only when
there is a Mix 1 Demand and the Mixing item in the Adjust
menu is set to variable speed injection pump (VAr).
DHW Pump
The DHW Pump operates whenever there is a DHW Demand
and the control is not in DHW Priority Override.
Mixing
Pump
Primary
Pump
DHW
Pump
Variable
Speed Injection
Pump
Pump Exercising Section L
The system control will exercise all pumps, mixing valves and hydronic zones (zone valves and zone pumps) for 10 seconds
every three days to prevent seizure.