Check list, Table 1 demand signals − humiditrol, Eda enabled – Lennox International Inc. 505 User Manual
Page 12
Page 12
EDA 01/06
Check List
n Checkpoint
What to Check
Action
Thermostat and
Sensor
Wiring
Confirm Sensor connected to SignatureStat
t using twisted pair
wire (see wiring diagram figure 13)
Thermostat
Humiditrol
®
Installer Settings
Confirm HUMIDITROL is enabled (see figure 8)
Thermostat
Humiditrol
®
User Settings
Confirm HUMIDITROL − Dehumidify − ON is selected (see figure 8)
Thermostat
Humiditrol
®
User Settings
Confirm Relative Humidity setting (see figure 8)
Indoor Unit
Variable-Speed Blower Settings
Confirm Settings for D": CFM = 60% to 65% of 2nd-stage cool
(see indoor unit installation instructions and table 1, below)
Insulation
Charge Compensator
C
fi
i
l ti
i
l i
t ll d (
h
t
kit
Insulation
Liquid Line
Confirm insulation is properly installed (see charge compensator kit
instructions; also, see figure 5)
Insulation
Vent Line to Suction Line
instructions; also, see figure 5)
Charge Compen-
sator
1/4"Line
Confirm 1/4" port oriented downward (see charge compensator
details, figure 5)
Check/Flow Re-
strictor
3/8" Line
Confirm restrictor installed/oriented properly (see check/flow restric-
tor details figure 5)
System Charge
Refrigerant
With unit running in cooling mode, check and confirm system is
properly charged (see outdoor unit installation instructions).
Outdoor Unit
Fan Relay
Confirm (if unit has variable speed outdoor fan) relay is installed
properly (see wiring diagram figures 12 and 13)
Outdoor Unit
EDA Label
Confirm label is installed in prominent location and will be easily
visible during servicing.
NOTE − System will NOT operate in dehumidification mode with outdoor temperature at or above 95ºF.
Operational Status
Dehumidification Mode
Record supply air temperature and confirm temperature that it is
higher than in cooling mode.
Operational Status
Dehumidification Mode
On units with variable speed outdoor fan, check that fan operates
at approximately 250 rpm (lowest speed).
Table 1
Demand Signals − Humiditrol
®
EDA Enabled
Operating Sequence
System Demand
System Response
Thermostat Demand
Relative Humidity
Com
Blower
CFM
System Type
Step
Y1
Y2
O
G
Status
D
Com-
pressor
CFM
(Cool) %
Comments
Cooling Operation − No call for dehumidification
Single-stage outdoor unit
1
ON
(na)
ON
ON
Acceptable
24 VAC
High
100
Compressor and indoor
bl
f ll
th
t t
Two-stage outdoor unit Y1
1
ON
−
ON
ON
Acceptable
24 VAC
Low
70
p
blower follow thermostat
demand
Two-stage outdoor unit Y2
2
ON
ON
ON
ON
Acceptable
24 VAC
High
100
demand
Demand for Dehumidification and Cooling
Single-stage outdoor unit
1
ON
(na)
ON
ON
Demand
24 VAC
High
100
Cooling operation has
i it
Two-stage outdoor unit Y1
1
ON
−
ON
ON
Demand
24 VAC
Low
70
g p
priority
Two-stage outdoor unit Y2
2
ON
ON
ON
ON
Demand
24 VAC
High
100
Dehumidification Mode Only − No Cooling Demand
Single-stage outdoor unit
1
ON
(na)
ON
ON
Demand
0 VAC
High
50 − 70*
A Humiditrol
®
EDA−
equipped system is allowed
to operate and cool room
temperature below set point
(but only by 2ºF) when try-
Two-stage outdoor unit Y2
2
ON
ON
ON
ON
Demand
0 VAC
High
50 − 70*
(but only by 2 F) when try
ing to satisfy a persisting
humidity set point; it is not
allowed to operate at all
when outdoor temperature
is >95ºF.
* NOTE − Blower CFM speed (percentage) will vary depending on selected indoor equipment (furnace, coil blower, etc.).