Snow Detector & Melting Control (Two Zone - Two Stage Boiler)

Control Description:
The Snow Detector & Melting Control 664 is a microprocessor-based two zone snow melting control capable of providing priority. The 664 operates either a floating action output, variable speed output or a modulating output (4-20 mA) to provide slab and boiler protection. The 664 is also capable of staging and / or rotating either a single two stage boiler or two single stage boilers. With separate melting and idling setpoints for each zone, the 664 can accommodate different slab construction types.

Specifications:
Literature: D 664, A 664's, D 001, D 070, E 021, U 664
Control: Microprocessor PID control; This is not a safety (limit) control
Packaged Weight: 3.5 lb. (1600 g), Enclosure A, blue PVC plastic
Dimensions: 6-5/8" H x 7-9/16" W x 2-13/16" D (170 x 193 x 72 mm)
Approvals: CSA C US, meets ICES & FCC regulations for EMI/RFI
Ambient Conditions: Indoor use only, 32 to 122+F (0 to 50+C), < 90% RH non-condensing
Power Supply: 115 V +10% 50/60 Hz 600 VA
Variable Pump: 230 V (ac) 2.4 A 1/6 hp, fuse T2.5 A 250 V
Relays: 230 V (ac) 5 A 1/3 hp, pilot duty 240 VA
Demands: 20 to 260 V (ac) 2 VA
Sensors Included: NTC thermistor, 10 kΩ @ 77+F (25+C +0.2+C) +=3892 Outdoor Sensor 070 and 3 of Universal Sensor 071
Optional Devices: Tekmar type #: 011, 039, 040, 072, 073, 090, 091