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General| Category | Controller |
|---|---|
| Input Voltage | 24 VAC |
| Housing Material | Plastic |
| Model | PC702-1 |
| Weight | 0.2 lbs |
Explains how heating systems match heat supplied to heat lost based on outdoor temp.
Combination of boiler starting temp and outdoor starting temp for reset ratio calculation.
Required water temp during the coldest day of the year for reset ratio calculation.
Heating system shuts down when outdoor temp is warmer than WWSD setting.
Boiler on/off cycling with a differential to prevent short cycling and improve efficiency.
Minimum supply water temp to prevent boiler corrosion from flue gas condensation.
Control overrides reset ratio for DHW demand, raising supply temp for DHW generation.
Control obtains boiler demand from Taco Zone Control when a zone calls for heat.
Control obtains DHW demand when voltage is applied across DHW demand wires.
Control displays WWSD segment and turns off boiler when outdoor temp rises above setting.
System supply water temp controlled by cycling boiler based on outdoor temp & reset ratio.
Control targets a supply water temperature of at least 180°F (83°C) for DHW demand.
Control does not allow boiler target temp to exceed design temp plus 10°F or 225°F max.
Setting selects minimum boiler target temp to prevent corrosion from flue gas condensation.
Optional boiler rotation function fixed at 48 hours to equalize stage running time.
Control manages two stages using interstage delay and PID logic for target temperature supply.
Sets minimum time delay between first and second stage firing.
Check package contents, contact sales rep for missing or damaged items.
Instructions for mounting the control enclosure onto a 2" x 4" electrical box.
Mounting the outdoor sensor on a wall representing the building's heat load.
Strapping the boiler sensor to a pipe or placing in a temperature immersion well.
Connect PC702-1 cable to Taco Zone Control Add-On interface, set Mode switch to Reset.
Connect Outdoor Sensor to Com/Out terminals and Boiler Sensor to Com/Sup terminals.
Stage 1 & 2 terminals are isolated outputs used as switches to control boiler circuits.
Apply voltage to DHW demand wires to generate a DHW demand.
Sets the starting supply water temperature for the reset ratio, adjustable 35-150°F.
Outdoor temp at which starting temp is supplied, adjustable 35-85°F.
Water temp required for building heat loss at coldest outdoor temp.
Outdoor temp used in heat loss calculation, set to typical coldest outdoor temp.
Minimum operating temp to prevent boiler corrosion from flue gas condensation.
Sets how far supply temp may deviate before boiler turns on/off, can be Auto or 2-42°F.
Sets minimum time delay between first and second stage firing, 30s to 4 min.
Boiler shuts down when outdoor temp is warmer than setting (35-100°F or Off).
Enter adjustment mode by pressing and holding Item, A, and V buttons simultaneously.
Control displays segments, version, then outdoor temp; view menu shows temperatures.
Identifies faults like outdoor/supply sensor errors or EEPROM faults and their effects.
Tips for adjusting settings based on room comfort and boiler cycling issues.
Procedure for testing sensor resistance using a meter and comparing to a chart.
Secure wiring cover, place front cover, and explain operation to end user.
Displays error messages for EEPROM, Outdoor Sensor, and Boiler Sensor faults.
Lists control specifications, dimensions, approvals, and environmental conditions.
