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Installer Manual
Programmable Touchscreen Thermostat
Up to 4 Heat / 2 Cool Heat Pump
Up to 3 Heat / 2 Cool Conventional
with Humidity Control
1 Specifications
Attention
Warning
Caution
• Possible electric shock or damage to equipment can occur.
• Disconnect power before beginning installation.
This thermostat requires 24 Volt AC Power or 2 properly installed "AA" Alkaline batteries for proper
operation. When connecting 24 Volt AC Power the batteries may be installed as a backup. Thermostat
installation and all components of the system shall conform to Class II Circuits per NEC code.
For use only as described in this manual. Any other use will void warranty.
1 Specifications
This thermostat is compatible with:
• Single stage heat / cool conventional and heat pump systems
• Conventional systems up to 3 stages of heating and 2 stages of cooling
• Heat pump systems up to 4 stages of heating and 2 stages of cooling
• 250 – 750 millivolt heating only systems
Electrical and control specifications:
• Electrical Rating: 24 Volt AC
• 1 amp maximum load per terminal
• AC Power: 18 – 30 Volts AC
• DC Power: 3.0 Volt DC (2 "AA" Alkaline
Batteries Included)
• Control Range: 45° – 90° F (7° – 32° C)
• Temperature Accuracy: +/- 1° F (+/- .5° C)
• Outdoor Temperature Display Range:
-40° - 120° F (-40° - 49° C)
Humidification Specifications
• Humidification Control Range: 10% - 50% RH
• Dehumidification Control Range: 40% - 80% RH
2 Installation and Wiring
4 Installer Settings
To prevent damage to the thermostat, never use a sharp instrument
to press the touchscreen keys. Always press keys with your fingers.
For installation by experienced service technicians only.
Model PRS6420
5 System Testing
Terminations
Rc, Rh, G, W1/E/AUX1, W2/AUX2, W3/O/B, Y1, Y2, C,
L, H, A/D, S1, S2
3 Quick Reference
PRS6420-100-01
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Summary of Contents for Prostat PRS6420
- Page 1 Model PRS6420 Installer Manual Programmable Touchscreen Thermostat Up to 4 Heat / 2 Cool Heat Pump Up to 3 Heat / 2 Cool Conventional with Humidity Control 1 Specifications 2 Installation and Wiring 3 Quick Reference 4 Installer Settings 5 System Testing...
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Page 2: Installation And Wiring
Avoid installation in locations where the thermostat can be affected by drafts, dead air spots, hot or cold air ducts, sunlight, appliances, concealed pipes, chimneys and outside walls. Install your new PROSTAT thermostat in 4 basic steps: 1 Install the sub-base... - Page 3 Provide Power Batteries Installed as Shown 24VAC Power Terminal (C) • For 24 Volt AC power, you must connect the common side of the transformer to the C terminal on the thermostat sub-base. In dual transformer installations, the transformer common must come from the cooling transformer.
- Page 4 Connecting Your Wires (continued) Wiring Terminations Terminal Function Description Output Humidifier A / D Output (A) Economizer Control, (D) Dehumidifier Output Fan Control Input 24 Volt AC Cooling Transformer (Dual Transformer Systems Only) Input Power Connection (24 Volt AC Heating Transformer or Millivolt Power Source) W1 / E / Output...
- Page 5 Conventional Systems Typical Wiring Configurations NOTE: The “System Type” option will be configured in the Installer Settings section. Heat Only or Millivolt 3 HEAT / 2 COOL Single or Dual Transformer Set System Type to 11CONV Set System Type to 32CONV Rh Power Connection Rh 24 Volt AC Power (heating transformer) [note 2] W1 Heat Relay...
- Page 6 Heat Pump Systems Typical Wiring Configurations NOTE: The “System Type” option will be configured in the Installer Settings section. 1 HEAT / 1 COOL - No Auxiliary Heat 3 HEAT / 2 COOL – Including Auxiliary Heat Set System Type to 11HP Set System Type to 32HP Rh 24 Volt AC Power 24 Volt AC Power...
- Page 7 All System Types Additional Wiring Options NOTE: Additional options are configured in the Installer Settings section. Indoor or Outdoor Remote Sensor [note 1] Economizer Control / Dehumidification Output [note 2] Humidification Output [note 3] NOTES - Additional Wiring Options [1] These terminals can be used to connect an indoor or outdoor remote sensor. [2] This terminal can be used for: A) Outside air control B) Control an external dehumidifier...
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Page 8: Quick Reference
3 Quick Reference Instructions RESET RESET Thermostat Display Room Temperature ...... Displays the current room temperature Lock Mode Indicator ....Indicates if the thermostat is locked Set Temperature ......Displays the current set point temperature Humidity Indicator ....... Indicates when there is a call for humidity Fan Indicator ........ -
Page 9: Thermostat Touchpads
RESET RESET Thermostat TouchPads NOTE: Thermostat TouchPads are located on the left, right and bottom portions of the display screen. They are the “touch sensitive” segments used to adjust your thermostat. Depending on the equipment installed, all touch pads may not show. SYSTEM Selects AUTO (Heat/Cool), COOL, OFF HEAT or EMER (Emergency Heat) Selects AUTO, ON, CIRC (Circulation) and PROG (Program) fan modes... -
Page 10: Installer Settings
4 Installer Settings The Installer Settings must be properly configured in order for this thermostat to operate correctly. The Installer Settings are menu driven. The portion of these settings that do not apply to your setup will be skipped. These settings are indicated below with comments. - Page 11 No. Installer Setting Factory Setting Comments Default Options Notes follow this table) (More information follows this table) HG FAN 1 HG FAN 1 11 1st Stage Fan Control Select for 1st stage Gas heating HE FAN 1 [note 3] Select for 1st stage Electric heating HE EMER HE EMER 12 Emergency Heat] Select for Electric Emergency Heat...
- Page 12 No. Installer Setting Factory Setting Comments Default Options Notes follow this table) (More information follows this table) OA NONE OA NONE 31 Outside Air Intake Disables Outside Air Intake option OA ECON (A Terminal) [note 13] Enables Outside Air Intake (Economizer Mode) OA TOD Enables Outside Air Intake (Time of Day Mode) 32 Heat Set Point Upper Limit 90LIM 90-60 LIM...
- Page 13 13 Reversing Valve [Note 5] – Selects the output state of the O/B terminal. Select O for this terminal to be active in the cool mode or select B for this terminal to be active in the heat mode. 14 Auxiliary Fossil Fuel Heat Pump Control [note 4] – When set to electric (AE AUX), both the compressor (1st stage) and auxiliary stage(s) will run when a call for auxiliary heat is made.
- Page 14 27 Dehumidification Fan Speed Control [note 10] – Select normally inactive relay (NI) or a normally active (NA) relay. 28 Auto Changeover Dead Band [note 11] – When Auto Changeover mode is enabled in option 5 and selected, the system automatically switches between heating and cooling when the room temperature meets the normal criteria for either a heating or cooling call.
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Page 15: System Testing
5 System Testing Warning Read Before Testing • Do not short (or jumper) across terminals on the gas valve or at the heating or cooling system control board to test the thermostat installation. This could damage the thermostat and void the warranty. •... - Page 16 PROPARTS agrees to repair or replace at its option any PROSTAT thermostat under warranty provided it is returned postage prepaid to our warranty facility in a padded carton within the warranty period, with proof of the original date of purchase and a brief description of the malfunction.
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