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© 2005 D 704 - 04/05
Design Procedure
1. Using the pump curve located below, ensure that the System Pump of the Mixing Station 704 will provide adequate fl ow for the
system in which it is to be installed.
2. Using the table or equation below, determine the required fl ow rate for the Injection Pump.
3. Using the pump curve located below, ensure that the Injection Pump of the Mixing Station 704 will provide adequate fl ow for the
system in which it is to be installed.
Application
SYSTEM PUMP CURVE
INJECTION PUMP CURVE
REQUIRED INJECTION PUMP FLOW RATE
Tb
= Boiler Supply Temperature
Ts
= Radiant Supply Temperature
Injection Flow Rate (GPM) =
BTU’s
(Tb - Ts) x 500
BTU’s x 1,000
Tb
-
Ts 20 40 60 80 100
120
100
0.4 0.8 1.2 1.6 2.0 2.4
80
0.5 1.0 1.5 2.0 2.5 3.0
60
0.7 1.3 2.0 2.7 3.3 4.0
40
1.0 2.0 3.0 4.0 5.0
20
2.0 4.0
Required Injection Flow Rate (GPM)
The Mixing Station 704 is a complete injection mixing system. Integral to the unit is a variable speed injection circulator, constant
speed system circulator, air elimination, and the electronics to drive it all. With only four piping connections needed, the RMB greatly
reduces the time and space required for installation. The RMB can be set up to operate as an outdoor reset control, a setpoint control
or a delta T limiting control, creating fl exibility never seen before in a single unit.
Check the contents of this package. If any of the contents listed are missing or damaged, please contact your wholesaler or tekmar
sales representative for assistance.
Contents should include the following:
• One Mixing Station 704, unit consisting of the following parts: (One Radiant Mixing Control, One Blue Enclosure, One
Casing with two circulators attached, One Backplate, One Power Cord (6 feet, attached to backplate))
• One 070 Outdoor Sensor
• One Universal Sensor 071
• One Universal Sensor 082
• Data Brochure D 704
Getting Ready
HEAD (f
t)
FLOW (gpm)
FLOW (m
3
/h)
HEAD (m)
0
0
5
10
15
0
1.14
2.27
3.41
2
4
6
8
10
12
14
16
18
0
0.6
1.2
1.8
2.4
3.0
3.6
4.2
4.8
5.5
HEAD (f
t)
FLOW (gpm)
FLOW (m
3
/h)
HEAD (m)
0
0
5
10
15
0
1.14
2.27
3.41
2
4
6
8
10
12
14
16
18
0
0.6
1.2
1.8
2.4
3.0
3.6
4.2
4.8
5.5
