Table of Contents
Advertisement
Table 9. Heat Pump Units Type 2
Thermostat
P181
Demand
Y1
Y2
1st Cool
ON
OFF
OFF
2nd Cool
ON
ON
OFF
3rd Cool
ON
ON
Low Heat
ON
ON
High Heat
ON
ON
Temperature Sensors - P178
Sensors are wired to P178 using communication wiring.
Connect the shield drain wire as shown in field wiring.
IMPORTANT
Make sure any sensors used are compatible with the
L Connection network. Refer to L Connection product
specification (EHB) for part numbers.
l
Z
s
a2
oCal
one
ensoR
The local zone sensor is required for system operation
unless the NTC is installed:
• In an air handling unit or other appliance which has no
heating or cooling functions.
• With a Zone Link as part of a zoning system.
• With a remote zone sensor.
r
a
S
rt16
eturN
ir
eNSOr
The return air sensor is optional and is used to monitor
or to limit heating or cooling. See A1.09, A1.10, A2.10
and A2.11 to set controller for return air temperature limit
option.
d
a
S
iSCharge
ir
eNSOr
The discharge air sensor is optional and is used to monitor
discharge air temperature.
o
a
s
RT17
UTdooR
iR
ensoR
The outdoor air sensor is optional and is used to monitor
outdoor air temperature and to control HP supplemental
heat lock−out and low ambient control. See A1.13, A1.14
and A1.15.
Analog Inputs - P179
Analog inputs are wired to P179 using communication
wiring. Connect the shield drain wire as shown in field
wiring.
IMPORTANT
Make sure any sensors used are compatible with the
L Connection network. Refer to L Connection product
specification (EHB) for part numbers.
NTC Digital Output
P182
Y3
W1
W2
0
B
OFF
OFF
ON
OFF
OFF
OFF
ON
OFF
ON
OFF
OFF
ON
OFF
ON
OFF
OFF
OFF
ON
ON
ON
ON
OFF
ON
rt6
C02
R
and
elaTive
The CO2 and RH sensors are optional and are used for
reporting and displaying to the Network Control Panel only.
G
d
f
ampeR
eedBaCk
ON
ON
The Damper FB input is optional and used for reporting
and displaying to the Network Control Panel only. The
ON
input is designed for a 2 to 10 VDC damper feedback
ON
signal; 2 volts = closed and 10 volts = 100% open.
ON
Digital Inputs - P177
Wire digital inputs to P177 using standard 18AWG
thermostat wire.
• Each input is isolated and rated for 24VAC.
• Digital inputs are optional, but air flow switch and n.c.
inputs must be jumpered to 24VAC if not used.
a
f
s
iR
low
wiTCh
The airflow switch is used to de−energize heating, cooling,
and blower outputs if there is a loss of blower air.
• The input must be energized within 20 seconds (ECTO
A4.05) of a blower (G) demand or the outputs will be
shut off and the controller will issue an alarm code 5
(airflow switch).
• The NTC will retry every five minutes. After three retries
with no blower air, the controller will lockout and alarm
code 205 will be issued.
• A reset is required after lockout.
NOTE: Connect 24VAC and common wiring to airflow
switch terminals when switch is not installed.
s
i
eRviCe
npUT
This input is used to indicate the unit may require service.
If the input is energized for longer than one minute
(ECTO A3.01), the controller will issue an alarm code 200
(service). This alarm is for information only and does not
interrupt operation.
• The input can be used to indicate a dirty filter.
• Set ECTO A3.01 to option 1.
• A dirty filter switch must be installed.
• If the dirty filter switch is on for one minute (ECTO
A3.01), the controller will issue an alarm code 6 (dirty
filter).
• This alarm is for information only and does not interrupt
operation.
NOTE: Leave this input open when not used.
n.C. n
oRmally
The N.C. input is used to de−energize all NTC outputs
when it opens. The NTC will de−energize all outputs and
issue an alarm code 202 (N.C. input is OFF). The NTC will
retry the input every five minutes.
Page 8
h
s
UmidiTy
ensoR
C
i
losed
npUT
Advertisement
Table of Contents
