Tekmar Universal Reset Module 422 User Manual

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.

Tekmar Universal Reset Module 422 Specifications

General

Brand	Tekmar
Model	Universal Reset Module 422
Category	Control Unit
Language	English