Application Brochure

ManualsBrandsTekmar ManualsHeating SuppliesMixing Control Variable Speed

Table Of Contents

1 of 12

- Application

Mixing Control 356

A 356-1

05/00

Note:

This is only a concept drawing. The designer must determine whether this application will work in his system and must ensure compliance with

code requirements. Necessary auxiliary equipment, isolation relays (for loads greater than the specified tekmar internal relay ratings), and other safety

and limit devices must be added.

Mechanical

see Essay E 021

Outdoor

Sensor (S2) 070

Class II

Transformer

120 V (ac)

24 V (ac)

Mix

Sensor

(S1) 071

Boiler

Sensor

(S3) 071

T1T2T3

Z1Z2Z3

356

Electrical

P1 = Variable Speed Injection Pump

P2 = Boiler Pump

P3 = Mixing System Pump

R1 = Relay 003

S1 = Mix Supply Sensor 071

S2 = Outdoor Sensor 070

S3 = Boiler Supply Sensor 071

T1, ..., T3 = Thermostats

V1 = Balancing or Globe Valve

Z1, ..., Z3 = Zone Valve Motor End Switches

356

Boiler

R+

C-

Power

Do not apply power

Out

Sup

Com

Boil

2.4A

Boiler

Zone Valve

Motor End

Switches

24 V (ac)

120 V (ac)

Class II

Transformer

Summary of content (12 pages)

PAGE 1
- Application A 356-1 05/00 Mixing Control 356 Mechanical 356 Outdoor Sensor (S2) 070 Class II Transformer 24 V (ac) 120 V (ac) R1 Z3 Z2 M M T3 Z1 M T2 see Essay E 021 T1 Mix Sensor P3 (S1) 071 Boiler Sensor P2 (S3) 071 P1 V1 Electrical 2.4A 5A 356 Do not apply power 1 2 3 4 P1 = Variable Speed Injection Pump P2 = Boiler Pump P3 = Mixing System Pump R1 = Relay 003 S1 = Mix Supply Sensor 071 S2 = Outdoor Sensor 070 S3 = Boiler Supply Sensor 071 T1, ...
PAGE 2
A 356-1 05/00 System Operation The Mixing Control 356 provides full outdoor reset to three (or more) mixed zones. The output of the variable speed injection pump is modulated to mix the water temperature to the zones, and protect the boiler from flue gas condensation. The boiler operates at the required temperature in order to satisfy the load. Heat Source Details The heat source can be either a high mass or low mass non-condensing boiler.
PAGE 3
- Application A 356-2 05/00 Mixing Control 356 Mechanical 356 Outdoor Sensor (S2) 070 Class II Transformer 120 V (ac) 24 V (ac) R2 R1 A2 Z3 Z2 Z1 M M T3 A1 M T2 see Essay E 021 T1 DHW Tank P4 Mix Sensor P3 (S1) 071 P1 Boiler Sensor (S3) 071 P2 V1 Electrical 2.
PAGE 4
A 356-2 05/00 System Operation The Mixing Control 356 provides full outdoor reset to three (or more) mixed zones. The output of the variable speed injection pump is modulated to mix the water temperature to the zones, and protect the boiler from flue gas condensation. The boiler operates at the required temperature in order to satisfy the loads. The supply of heat to an indirect Domestic Hot Water (DHW) tank is controlled through an external relay.
PAGE 5
- Application A 356-3 05/00 Mixing Control 356 356 Mechanical Outdoor Sensor (S2) 070 Class II Transformer 120 V (ac) 24 V (ac) R2 R1 A2 Z3 Z2 T3 A1 Z1 M M M T2 M see Essay E 021 T1 V1 Mix Sensor P3 (S1) 071 P1 P2 ∆P 2.
PAGE 6
A 356-3 05/00 System Operation The Mixing Control 356 provides full outdoor reset to three (or more) mixed zones. The output of the variable speed injection pump is modulated to mix the water temperature to the zones, and protect the boiler from flue gas condensation. The boiler operates at the required temperature in order to satisfy the loads. The supply of heat to an indirect Domestic Hot Water (DHW) tank is controlled through an external relay.
PAGE 7
Mix 1 Mix 2 356 120 V (ac) 356 Outdoor Sensor (S2) 070 Class II Transformer Outdoor Sensor (S5) 070 24 V (ac) R1 see Essay E 021 R2 Mix Sensor (S1) 071 P2 V1 Z2 Z4 Z1 T2 M T4 T1 Mix 1 Boiler Return Sensor (S3) 071 Z3 M M M see Essay E 021 T3 P3 Mix 2 Mix Sensor (S4) 071 P5 P4 P1 Boiler Return Sensor (S6) 071 V2 - Application 2 X Mixing Control 356 Mechanical 7 of 12 Electrical 2.4A 5A 356 2.
PAGE 8
A 356-4 05/00 System Operation Two Mixing Control 356’s provides full outdoor reset to two independent mixed temperatures. The outputs of the variable speed injection pumps are modulated to provide a mixed supply water temperature to the zones, and protect the boiler from flue gas condensation. The boiler operates at its operating aquastat temperature. Heat Source Details The heat source can be either a high mass or low mass non-condensing boiler.
PAGE 9
- Application A 356-5 05/00 Mixing Control 356 Mechanical 356 Mix Demand Class II Transformer 24 V (ac) 120 V (ac) see Essay E 021 Mix Sensor (S1) 071 P3 Boiler Sensor (S2) 071 P1 P2 V1 Electrical 2.
PAGE 10
A 356-5 05/00 System Operation The Mixing Control 356 provides setpoint control to fancoil zones. The output of the variable speed injection pump is modulated to provide a fixed water temperature to the zones, and protect the boiler from flue gas condensation. The boiler operates at the required temperature in order to satisfy the load. Heat Source Details The heat source can be either a high mass or low mass non-condensing boiler. Piping Details Fancoil units are piped into the mixed loop.
PAGE 11
356 256 Outdoor Sensor (S4) 070 Outdoor Sensor (S2) 070 Class II Transformer 120 V (ac) 24 V (ac) R2 A2 R3 Z4 R1 Z3 Z2 M M T4 Z1 M see Essay E 021 T3 Mix Sensor P4 (S3) 071 A1 M T2 T1 P3 P2 P1 Boiler Return Sensor (S5) 071 ∆P V1 Boiler Sensor (S1) 071 DHW Tank V2 - Application Boiler Control 256 and Mixing Control 356 Mechanical 11 of 12 Electrical 2.
PAGE 12
A 356-6 05/00 System Operation The Mixing Control 356 and the Boiler Control 256 are combined to provide full outdoor reset to two (or more) mixed zones and partial outdoor reset to two (or more) boiler zones. The output of the variable speed injection pump is modulated to provide a mixed supply water temperature to the mixed zones, and protect the boiler from flue gas condensation. The boiler operates at the required temperature in order to satisfy all the loads.