Job __________________________
Designer ______________________
Contact _______________________
www.tekmarcontrols.com of 2 © 20 C 664 - 0/
0/
Snow Melting
Replaces: New
Front View
Side View
2–7/8”
(72 mm)
1/2” Knock-out
(x 5 back) (x 5 bottom)
Mounting Base
CL
1/2”
(13 mm)
7/8”
(23 mm)
6–5/8”
(170 mm)
7–5/8”
(193 mm)
1–7/8” (49 mm)
1/2”
(14 mm)
Ø 3/16” (5 mm)
--------------------------
Automatic snow detection and melt control
(with 090 Sensor)
Control up to 2 zones
Control up to 2 boilers
Slab temperature control
Mixing control (floating, variable speed, or
proportional)
Temporary Idle
Optional priority zoning operation
Slab protection for the snow melting system
Boiler Protection
Manual Override
Warm Weather Shut Down
Cold Weather Cut Out
Remote display and adjustment capabilities
Test sequence to ensure proper
component operation
Equipment Exercising
CSA C US certified (approved to applicable
UL standards)
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The Snow Detector & Melting Control 664 is designed to operate mechanical equipment to melt snow off of up to 2 outdoor slabs. It can
be used in hydronic snow melting applications consisting of up to 2 zones and 2 boilers where each zone can operate at an independent
temperature. This product uses a tekmar snow/ice detection sensor in order to automatically melt snow in a priority sequence while
protecting the boiler plant with a mixing device. It is capable of controlling up to 2 boilers, a variable speed or modulating (4-20 mA)
mixing device, a mix system pump, and 2 zone pumps.
An 090 Snow/Ice Sensor or Slab Sensor.
Two Zone, Two Stage Boiler, Mixing
Literature D664, A664, U664, D00, D070, E02
Control Microprocessor control. This is not a safety (limit) control
Packaged weight 3.5 lb. (600 g)
Dimensions 6-5/8” H x 7-9/6” W x 2-3/6” D (70 x 93 x 72 mm)
Enclosure Blue PVC plastic, NEMA type
Approvals CSA C US, meets class B: ICES & FCC Part 5
Ambient conditions
Indoor use only, 32 to 22°F (0 to 50°C), RH ≤90% Non-
condensing
Power supply 5 V (ac) ±0%, 50/60 Hz, 600 VA
Floating relays 230 V (ac) 5 A, /6 hp
Stage/Zn/P relays 230 V (ac) 5 A, /3 hp
Var. pump 230 V (ac) 2.4 A max (FLA) 5 A max (LRA), fuse T2.5 A 250 V
Demands 20 to 260 V (ac) 2 VA
Sensors NTC thermistor, 0 kΩ @ 77°F (25°C ±0.2°C) ß=3892
–Included Outdoor Sensor 070 and 3 of Universal Sensor 082
–Optional tekmar type #: 039, 040, 072, 073, 090, 09, 094, 74
Warranty Limited 3 Year (See D664 for full warranty)
+
2
–
3
Opn/4-20 mA
Var
4
Pwr
Mix
5
Cls
6
Red
7
Blk/
Com
8
Blu
9
Yel
0
Brn/
Slab1
Slab
2
2
Com
3
tN2
4
Mix
Ret
5
Mix
Sup
6
Com
7
Boil
8
Out
9
Melt/Idle
Demand
20 2
Stage
1
22 23
Stage
2
24 25
Zn
1
26
Com
Zn
27
Zn
2
28 30
Sys
P1
29
Power
L N
Menu
Test
Two Zone, Two Stage Boiler, Mixing
Item
Start Stop
Idle Demand
Signal wiring must be rated at least 300
Melt Demand
not testing
testing
testing paused
For maximum heat,
press and hold Test
button for 3 seconds.
Made in Canada by
tekmar Control Systems Ltd.
tektra 900-0
Power 115 V ± 10% 50/60 Hz 600 VA
Floating Relays 230 V (ac) 5 A 1/6 hp
Stage/Zn/P1 Relays 230 V (ac) 5 A 1/3 hp
Var. Pump 230 V (ac) 2.4 A max (FLA)
5 A max (LRA), fuse T2.5 A 250V
Demand 20 to 260 V (ac) 2 VA
1 kΩ max
power
Date Code
H98D
Meets Class B:
Canadian ICES
FCC Part 5
Melt Demand
Idle Demand
WWSD
Minimum
Maximum
Water
Melting
ATC Contractor to coordinate with
Limbach and Snow melting system
vendor for additional monitoring
sensors, and install of all devices
and output to BMS.
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