Application Brochure

© 2013 654_A - 06/13 8 of 16
Single Zone Mixing with Space Heating & DHW A654-4 Mechanical
Description
A snow melting system is operated together with a space heating and domestic hot water system. A Snow Melting Control
654 operates the hydronic snow melting system using a mixing injection pump and a system pump. The mixing injection
pump is modulated using a 0-10 V (dc) or 4-20 mA signal to maintain the slab at the slab target temperature. The 654 uses
tekmarNet
®
communication to call for heat from the House Control that operates the space heating and domestic hot water
system. When a Snow / Ice Sensor 090 or 094 is installed, the system automatically starts when snow or ice is detected and
continues to run until the slab is dry. When a Snow Sensor 095 is installed together with a Slab Sensor 072 or 073, the system
automatically starts when snow is detected and runs on a timer before shutting off. All systems can be manually started and
shut off using a timer when either a Snow / Ice Sensor 090 or 094 or a Slab Sensor 072 or 073 is installed.
Snow or Ice Detector
Option Start and Stop Sequence Sensors Required (sold separately)
1 Auto start / Auto stop Snow / Ice Sensor 090 or 094
2 Auto start / Timed stop Snow Sensor 095 & Slab Sensor 072 or 073
3 Manual start / Timed stop Slab Sensor 072 or 073
Application Settings
Setting Name Value
APP MODE MIX
BOIL TYPE CTRL (tN4 control)
OUT/BRET SENSOR BRET
AUX RELAY SYS (system pump)
tN4 SYS PUMP OFF
Space Heating System
DHW
Tank
*See Essay E021 for injection loop piping details.
Recommended pumps are Grundfos UP 15-58 F/VS, UP 26-64 F/VS
and Taco 003-VV, 007-VV, 0010-VV, 0012-VV.
Recommended Accessories
Qty Part Name Part Number
1 Wiring Center 316
1 Transformer Kit 009K
1 Universal Sensor 082
1 tN4 System Control (Choose one) 274, 275, 284, 400, 401, 402,
403, 406, 420, 421, 422, 423
Outdoor
Sensor
070
654
System
Pump 1
On/Off Boiler
316402
System
Pump 2
Boiler Return
Sensor 082
Mixing
Injection
Pump*
Supply
Sensor
082
Freeze
Protection
Aquastat
N.C.
Contact
Option 1
Snow / Ice Sensor
090 or 094
Option 2
Snow Sensor 095 and
Slab Sensor 072 or 073
Option 3
Slab Sensor
072 or 073
Boiler Pump
(tN4 System Pump)