,?_2008 Lennox industries Inc,
Dallas, Texas, USA
INSTALLATION
INSTRUCTIONS
Merit® Series13HPX Units
HEAT PUMP UNITS _Technical
505,325M LLJJ Publications
03/08 Litho U.S.A.
Supersedes 07/07
WARNING
A CAUTION
A IMPORTANT
IMPORTANT
13HPX Outdoor Unit ........................... 1
Shipping and Packing List ...................... 1
Unit Dimensions ............................... 2
General Information ........................... 2
Setting the Unit ............................... 3
Electrical ..................................... 4
Refrigerant Piping ............................. 6
Flushing Existing Line Set and Indoor Coil ........ 8
Refrigerant Metering Device .................... 10
Manifold Gauge Set ........................... 10
Service Valves ................................ 10
Leak Testing .................................. 11
Evacuation ................................... 11
Start-Up ...................................... 12
Refrigerant Charge ............................ 12
Checking Airflow .............................. 12
Setup for Checking and Adding Charge .......... 13
System Operation ............................. 17
Defrost System ............................... 17
Maintenance .................................. 18
Optional Accessories .......................... 19
Homeowner Information ........................ 19
Thermostat Operation .......................... 20
13HPX Check List ............................. 20
RETAIN THESE INSTRUCTIONS
FOR FUTURE REFERENCE
13HPX Merit ® outdoor units use HFC-410A refrigerant.
This unit must be installed with a matching indoor blower
coil and line set as outlined in the Lennox Engineering
Handbook. 13HPX outdoor units are designed for use in
expansion valve systems only. They are not designed to be
used with other refrigerant flow control devices. An expan-
sion valve approved for use with HFC-410A must be or-
dered separately and must be installed prior to operating
the unit.
1 - Assembled 13HPX outdoor unit
Check the unit components for shipping damage. If you
find any damage, immediately contact the last carrier.
03/08
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