Heat Pump Control -- Defrost Operation; Alarms; Charging; System Component Configuration - Lennox Elite XP20-024-230 Installation Instructions Manual

Heat Pump Control -- Defrost Operation

A full description of the heat pump control can be found in
the detailed installation and service procedure manual
available on LennoxPROS.com.
The heat pump control (A175) measures differential tem­
peratures to detect when the system is performing poorly
because of frost build-up on the outdoor coil. The heat
pump control self-calibrates when the defrost system
starts and after each system defrost cycle. The heat pump
control monitors ambient temperature, outdoor coil tem­
perature, and total run-time to determine when a defrost
cycle is required. The coil temperature sensor is designed
with a spring clip to allow mounting to the outside coil tub­
ing. The location of the coil sensor is important for proper
defrost operation. Detailed information is given in the XP20
Installation and Service Procedures Corp. 1408-L10,
which is available on LennoxPROS.com.
NOTE - The heat pump control accurately measures the
performance of the system as frost accumulates on the
outdoor coil. This typically will translate into longer running
time between defrost cycles as more frost accumulates on
the outdoor coil before the heat pump control initiates de­
frost cycles.

Charging

The XP20 unit is factory-charged with enough HFC-410A
refrigerant to accommodate a 15-foot length of refrigerant
piping. Charge should be checked and adjusted using the
tables provided on the charging procedure sticker on the
unit access panel. Detailed information is provided in the
XP20 Installation and Service Procedures manual, which
is available on LennoxPROS.com.
Room thermostat must be turned down at least 5°F
from set point so charging occurs with system
operating at 100% capacity. Seven-segment display
on outdoor control will show outdoor unit running
capacity.

Alarms

Alarm information is provided on on the outdoor unit ac­
cess panel and in the iComfort Wi-Fi
Setup Guide. Detailed alarm information is also available
in the XP20 Installation and Service Procedures Corp.
1408-L10, which is available on LennoxPROS.com.
Outdoor Control Seven-Segment Display
and Push Button
Information concerning the outdoor control seven-seg­
ment display and push button operations are available on
the unit access panel and in the XP20 Installation and Ser­
vice Procedures Corp. 1408-L10.

System Component Configuration

(Outdoor Unit)
All configuration of the outdoor unit is completed using the
®
iComfort Wi-Fi thermostat. Please refer to the iComfort
®
Wi-Fi Installer's System Setup Guide for complete details
on how to integrate this unit into a iComfort
tem.
Page 15
IMPORTANT !
®
Installer's System
®
-enabled sys­
XP20 SERIES