Honeywell D1-528 Direct Thermostat Installation Guide
INNCOM DIRECT D1-528 THERMOSTAT INSTALLATION GUIDE
TROUBLESHOOTING
Error/Trouble
condition
Probable cause
Solution
• Verify the 10 pin harness is fully
connected/plugged into the 10 pin
connector on the back of the D1-528.
• Verify 24VAC is present/available on
the HVAC unit low voltage interface
terminal R (24VAC) and C (Common).
Is the breaker powering the HVAC unit
tripped and needs investigation and
needs to be reset.
• Verify the Black wire from Pin 3 is
connected to C-Common and that the
Red wire from Pin 2 is connected to R-
24VAC on the low voltage interface of
the HVAC unit.
The D1-528 display is
blank/empty, or is cycling
on and off during initial
installation.
The D1-528 is not powered correctly
• Is the Green Ground correctly
connected from the 10 Pin harness
pin 1 to the Earth ground of the HVAC
unit.
• Is the 24VAC transformer in the HVAC
unit that is supplying 24VAC to the
D1-528 sized correctly? What is the
VA rating of the transformer. The
INNCOM components require 2.4 VA
from the HVAC unit transformer
The D1-528 is displaying
a temperature or OFF
instead of rid.
The installed D1-528 has already been
initialized (possible correctly or
incorrectly).
A brand new, out of the box D1-528
should display rid after it powers up,
indicating it requires being configured
with its unique Room ID and other
settings.
If this is during initial installation, you
should Factory Boot the D1-528 to set it
back to default factory settings which
will then force you to enter/define the
required Room ID, HVAC Type and FAN
speeds.
31-00721-01
36
| General | Details |
|---|---|
| Name | Honeywell D1-528 Direct Thermostat Installation Guide |
| Make | Honeywell |
| Language | English |
| Filetype | PDF (Download) |
| File size | 1.63 MB |
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