tekmar 352 House Control - Manual

Copyright © D 352 - 06/00 1 of 8
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.
1
C
2
R
3
Heat
4
Heat
6
Sen
RTU
7
Sen
Com
8
Sen
Sup
9
Sen
Out
Signal wiring
must be rated
at least 300V
H11191
Heat
Demand
Heat
Aug 95
31000265 R
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
5
Sw
UnO Power Relay Boiler / Injection
70 °F (21°C)
40 (4) 100 (38)
UnOccupied
Do not apply power
0.2
2
3.6
1
3
Heating Curve
70
M
PRGM
S
T I M E AMPM UNOCC OVR S M W T F T
1
2
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
or
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