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House Control 352

D 352

- Data Brochure

06/00

The House Control 352 is a microprocessor-based outdoor reset control designed to control the

temperature of a single zone hydronic heating system. The 352 regulates the supply water

temperature based on the outdoor air temperature and optionally the indoor air temperature. The

352 can either operate a boiler and a system pump, or an injection valve and a system pump. To

avoid boiler short cycling and large temperature swings, the 352 has a built in function which con-

tinuously adjusts the boiler differential.

The 352 includes features such as Warm Weather Shut Down (WWSD), system pump exercising,

Night Setback (UnOccupied period), minimum boiler supply temperature setting (Boiler mode) and

maximum supply water temperature setting (Injection mode). A Room Temperature Unit (RTU) 054 or

an Indoor Sensor 076 can be connected to the 352 to provide indoor temperature feedback.

Control Strategy . . . . . . . . . . . . pg. 1 Testing the Control . . . . . . . pg. 7

Sequence of Operation . . . . . . . pg. 3 Error Messages. . . . . . . . . . . pg. 7

Installation . . . . . . . . . . . . . . . . . pg. 4 Technical Data . . . . . . . . . . . pg. 8

Settings . . . . . . . . . . . . . . . . . . . pg. 6 Limited Warranty . . . . . . . . . pg. 8

Constant

Room Temperature

Outdoor

Temperature

Drop

Heat

Loss

Increase

Control Strategy

OUTDOOR RESET

In order to properly control a hot water heating system, the heat supplied

to the building must equal the heat lost by the building.

• The heat supplied to a building is proportional to the temperature of the

water and the surface area of the heating element. A small surface area

such as baseboard radiators requires a higher water temperature than

a larger surface area such as radiant floors.

• The heat lost from a building is dependent on the outdoor temperature.

As the outdoor temperature drops, the building heat loss increases.

Test

Power

Min. Boiler /

Max. Supply

House Control 352

One Zone, Boiler /

Injection

Pump

WWSD

UnOcc.

Heat

Sen

RTU

Sen

Com

Sen

Sup

Sen

Out

Signal wiring

must be rated

at least 300V

H11191

Heat

Demand

Heat

Aug 95

31000265

NRTL/C

LR 58223

Made in Canada by

tekmar Control

Systems Ltd.

Power:

24 V 50/60 Hz 3 VA

Relays:

120 V (ac) 10 A 1/3 hp

pilot duty 240 VA

UnO

Power Relay

Boiler / Injection

70°F (21°C)

40 (4) 100 (38)

UnOccupied

Do not apply power

0.2

3.6

Heating Curve

PRGM

TIME

AMPM

UNOCC

OVR

SMWTFT

Input

24 V (ac)

Power Supply

Input

Outdoor Sensor

Included

Input

tekmar RTU or

Indoor Sensor

Output

Boiler or Valve

Input

Supply Sensor

Included

Input

tekmar

Timer

Output

System Pump

(through back of control)

140°F

170

Min. Boiler /

Max. Supply

105 Off

Power

Min. Boiler /

Max. Supply

House Control 352

One Zone, Boiler /

Injection

Pump

WWSD

UnOcc.

Heat

Demand

Heat

1 2 3 4 5 6 7 8

Inhaltsverzeichnis

Seite 1 - - Data Brochure

Seite 2 - MIXING OPERATION

Seite 3 - Sequence of Operation

Seite 4 - Installation

Seite 6 - Settings

Seite 7 - Error Messages

Seite 8 - One Zone, Boiler / Injection

Technical DataLimited Warranty and Product Return ProcedureThe installer must ensure that this control and its wiring are isolated and/or shielded fro

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Tekmar 352 House Control Bedienungsanleitung

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Inhaltsverzeichnis

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