Honeywell RTH8500 Wifi Thermostat User Manual
Quick Installation Guide
Number
Description
Options (factory default in bold)
1 - 6 CPH (3 CPH)
Note: This ISU is only displayed when Cool /Compressor Stages is set to 1 or more stages. Cycle
rate limits the maximum number of times the system can cycle in a 1 hour period measured
at a 50% load. For example, when set to 3 CPH, at a 50% load, the most the system will cycle
is 3 times per hour (10 minutes on, 10 minutes off). The system cycles less often when load
conditions are less than or greater than a 50% load.
Cool 1 CPH (Cooling
cycle rate stage 1)
365
Cool 2 CPH (Cooling
cycle rate stage 2)
1 - 6 CPH (3 CPH)
Note: This ISU is only displayed when Cool /Compressor Stages is set to 2.
366
370
1 - 12 CPH
Note: This ISU is only displayed when Heat Stages is set to 1 stage or more stages. Cycle rate
limits the maximum number of times the system can cycle in a 1 hour period measured at a
50% load. For example, when set to 3 CPH, at a 50% load, the most the system will cycle is
3 times per hour (10 minutes on, 10 minutes off). The system cycles less often when load
conditions are less than or greater than a 50% load. The recommended (default) cycle rate
settings are below for each heating equipment type:
Heat 1 CPH (Heating
cycle rate stage 1)
Standard Efficiency Gas Forced Air = 5 CPH; High Efficiency Gas Forced Air = 3 CPH; Oil
Forced Air = 5 CPH; Electric Forced Air = 9 CPH; Fan Coil = 3 CPH; Hot Water Radiant Heat
= 3 CPH; Steam = 1 CPH.
1 - 12 CPH
Note: This ISU is only displayed when Heat Stages is set to 2 stages. The recommended
(default) cycle rate settings are below for each heating equipment type:
Standard Efficiency Gas Forced Air = 5 CPH; High Efficiency Gas Forced Air = 3 CPH; Oil
Forced Air = 5 CPH; Electric Forced Air = 9 CPH; Fan Coil = 3 CPH; Hot Water Radiant Heat
= 3 CPH; Steam = 1 CPH.
Heat 2 CPH (Heating
cycle rate stage 2)
371
375
1 - 12 CPH
Note: This ISU is only displayed when ISU 200 = Heat Pump and ISU 221=1. It is only displayed
when Auxiliary Heat is configured. The recommended cycle rate settings are below for each
heating equipment type:
Standard Efficiency Gas Forced Air = 5 CPH; High Efficiency Gas Forced Air = 3 CPH; Oil
Forced Air = 5 CPH; Electric Forced Air = 9 CPH.
Aux Heat CPH (Heating
cycle rate Auxiliary
Heat)
0 = No
1 = Yes
425
430
Smart Response
Note: Smart Response is a comfort setting. Heat or Cooling equipment will turn on earlier,
ensuring the indoor temperature will match the setpoint at the scheduled time. See page 16.
50 °F to 99 °F (50 °F)
10.0 °C to 37.0 °C (10.0 °C)
Note: The cool temperature cannot be set below this level.
Minimum Cool
Temperature Setpoint
40 °F to 90 °F (90 °F)
4.5 °C to 32.0 °C (32.0 °C)
Note: The heat temperature cannot be set above this level.
Maximum Heat
Temperature Setpoint
431
702
0 - 1
Note: This ISU refers to the number of air filters in the system.
Air Filters
0 = Off
10 = 45 Calendar Days
11 = 60 Calendar Days
12 = 75 Calendar Days
13 = 3 Calendar Months
14 = 4 Calendar Months
15 = 5 Calendar Months
16 = 6 Calendar Months
17 = 9 Calendar Months
18 = 12 Calendar Months
19 = 15 Calendar Months
1 = 10 Run Time Days
2 = 20 Run Time Days
3 = 30 Run Time Days
4 = 45 Run Time Days
5 = 60 Run Time Days
6 = 90 Run Time Days
7 = 120 Run Time Days
8 = 150 Run Time Days
9 = 30 Calendar Days
Air Filter 1
Replacement Reminder
711
Note: Set a reminder for when to change your air filter. Choose either calendar or equipment run
time-based reminder.
0= Off, 0 - 5
Note: Adjust brightness of an inactive backlight (idle screen) from default 0 (backlight off) to 5
(maximum brightness). Common wire required for settings 1-5.
1401
1410
1415
Idle Brightness
Clock Format
12 hour, 24 hour
0 = Off
1 = On
Note: Set to Off in areas that do not follow Daylight Saving Time.
Daylight saving time
NOTE: Once you have cycled through all of the System Setup numbers, Done is displayed. Press Select to
save and exit.
10
| General | Details |
|---|---|
| Name | Honeywell RTH8500 Wifi Thermostat User Manual |
| Make | Honeywell |
| Language | English |
| Filetype | PDF (Download) |
| File size | 1.11 MB |
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