tekmar M3061 Mixing Valve Adapter Kit - Manual (Page 2)

2 of 4 Copyright © D 016 -10/00
The body of the tekmar mixing valve is constructed from cast iron which
has been found to be the most economical and suitable material for the
high stress environment in which the valve operates. As with all ferrous
components in a hydronic system, certain precautions are required in
order to prevent any appreciable corrosion from occurring. When the
mixing valve is used with a tekmar mixing reset control, the control
ensures that the valve is fully opened and fully closed every three days.
During this exercising period, a stainless steel roller seal scrapes the
corrosion products off the inside of the valve in order to prevent the valve
flap from seizing.
In some automatic systems, an exercising function is not provided and
the mixing valve flap is not rotated through its full range. A build up of
corrosion outside the normal range of motion can result in the valve flap
jamming when a greater movement is required. This is typically found in
systems where the valve is oversized for most of the heating season and
is then required to supply additional heat on a very cold day. One
indication of a seized valve flap is a broken shear pin on the actuating
motor shaft or a broken coupling. Before replacing the shear pin or
coupling, carefully disassemble and clean the valve. If corrosion is not
evident, ensure the system is free from any foreign material that may
have lodged in the valve.
Note: Damage to the valve due to foreign objects or excessive corrosion
is not covered under warranty.
When the mixing valve is used manually, adequate corrosion control
must be provided and the valve flap should be rotated through its full
range on a regular basis in order to prevent seizure. If the valve flap does
become jammed, do not force it to move as internal components may be
damaged. A seized valve must be carefully disassembled and cleaned.
To disassemble the valve, remove the 4 bonnet bolts and carefully pull
the flap assembly out of the valve body.
Valve Maintenance
To reduce the possibility of dam-
age to the valve, install a tekmar
Mixing Control with an “exercis-
ing function”. When the valve flap is exercised regu-
larly, the full range of motion of the
mixing valve remains free of corrosion.
Corrosion build up within a valve
due to poor water quality and a
limited range of valve flap motion. Corrosion buildup within a manual
valve due to poor water quality and
infrequent valve flap movement.
After removing the flap assembly, carefully remove rust and scale from
the valve body and flap assembly using steel wool or emery cloth. The
valve should be lubricated with a waterproof high temperature grease
before it is reassembled.
Use the valve handle
to
carefully pull the flap
assembly straight out
from the valve body.
9 8 7 6 5 4 3 2
1 2 3 4 5 6 7 8
1" valves have 4 hex
socket cap screws under
the aluminum scale plate.
Remove the 4
bonnet bolts
Cleaning the Mixing Valve
Exploded View
All Valve Parts Less Cast Iron Body
Actuating
Motor
Four Way
Valve
016 - 025
tekmar
Mixing
Control
M
Mixing Valve
Actuating Motor
Shear pin provides break point when maximum stress force is reached.
A broken shear pin is an indication that the valve has jammed.
2 x "O" Rings
"O" Ring
Retainer
Scale Plate
Handle
Handle Screw
Limit
Peg
Rubber spring
Stainless steel roller seal
Roll Pin
Valve Flap Shaft
Bonnet Gasket
Lower "O" Ring Retainer
Bonnet
Bolt (x4)
Bonnet