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13HPD SERIES

NOTE − The CTXV can be installed internally in coil
blowers, or external or internal to indoor coil only
applications.

Table 4. CTXV Indoor Kits

Model

Kit Number

13HPD−018, −024, −030, −036

LB−85759F

13HPD−042, −048

LB−85759G

13HPD−060

100188−01

IMPORTANT

Failure to remove a fixed orifice when installing an
expansion valve on the indoor coil will result in
improper operation and damage to the system.

Brazing Connections

WARNING

Polyol ester (POE) oils used with HFC−410A
refrigerant absorb moisture very quickly. It is very
important that the refrigerant system be kept
closed as much as possible. DO NOT remove line
set caps or service valve stub caps until you are
ready to make connections.

WARNING

When using a high pressure gas such
as dry nitrogen to pressurize a
refrigeration or air conditioning
system, use a regulator that can
control the pressure down to 1 or 2
psig (6.9 to 13.8 kPa).

Use the following procedure to braze the line set to the new
outdoor unit. Figure 17 is provided as a general guide for
preparing to braze the line set to the outdoor unit.

Before brazing the line set, remove the service port core
from both of the outdoor unit’s service valves as illustrated
in figure 16.

REMOVE SERVICE

PORT CAP

REMOVE PORT CORE

OUTDOOR UNIT

SERVICE VALVE

Figure 16. Typical Service Valve Port Core Removal

WARNING

Danger of fire. Bleeding the
refrigerant charge from only the high
side may result in the low side shell
and suction tubing being
pressurized. Application of a brazing
torch while pressurized may result in
ignition of the refrigerant and oil
mixture − check the high and low
pressures before unbrazing.

1. Cut ends of the refrigerant lines square (free from

nicks or dents). Debur the ends. The pipe must remain
round, do not pinch end of the line.

2. Remove service cap and core from both the vapor and

liquid line service ports.

3. Connect gauge low pressure side to liquid line service

valve.

4. To protect components during brazing, wrap a wet

cloth around the liquid line service valve body and
copper tube stub and use another wet cloth
underneath the valve body to protect the base paint.

5. Flow regulated nitrogen (at 1 to 2 psig) through the

refrigeration gauge set into the valve stem port
connection on the liquid line service valve and out of
the valve stem port connection on the vapor service
valve. The CTXV metering device at the indoor unit
coil will allow low pressure nitrogen to flow through the
system.)

NOTE − The TXV metering device at the indoor unit coil will
allow low pressure nitrogen to flow through the system.)

NOTE − Use silver alloy brazing rods with five or six percent
minimum silver alloy for copper−to−copper brazing or 45
percent silver alloy for copper−to−brass or copper−to−steel
brazing.

Summary of Contents for Merit 13HPD018

Page 1: ...61M 09 07 Supersedes 504 943M Table of Contents Shipping and Packing List 1 13HPD Outdoor Unit 1 Unit Dimensions 2 General Information 2 Recovering Refrigerant from Existing System 4 Disconnecting and...

Page 2: ...rom address shown below or contact your supervisor Lennox Industries Inc P O Box 799900 Dallas TX 75379 9900 General Information These instructions are intended as a general guide and do not supersede...

Page 3: ...stripping of the various caps used the appropriately sized wrench should be used and fitted snugly over the cap before tightening Operating Angle Type Service Valve To Access Angle Type Service Port...

Page 4: ...tem clockwise 90 3 Replace the stem cap and tighten as follows With Torque Wrench Finger tighten and then tighten per table 1 Without Torque Wrench Finger tighten and use an appropriately sized wrench...

Page 5: ...lifting heavy objects See Unit Dimensions on page 2 to determine the correct mounting size slab platform or support Refer to figure 7 for mandatory installation clearance requirements SEE NOTES BELOW...

Page 6: ...s the refrigerant lines will not create unnecessary vibration and subsequent sounds REFRIGERANT LINE SET Field refrigerant piping consists of liquid and vapor lines from the outdoor unit braze connect...

Page 7: ...TUDS STRAP SLEEVE WOOD BLOCK STRAP SLEEVE WIRE TIE WIRE TIE WIRE TIE INSIDE WALL Figure 11 Refrigerant Line Set Installing Vertical Runs New Construction Shown NOTE Similar installation practices shou...

Page 8: ...fixed orifice size for each unit In non standard applications the provided fixed orifice may not be appropriate CTXV SYSTEMS 1 On fully cased coils remove the coil access and plumbing panels 2 Remove...

Page 9: ...VALVE Figure 16 Typical Service Valve Port Core Removal WARNING Danger of fire Bleeding the refrigerant charge from only the high side may result in the low side shell and suction tubing being pressu...

Page 10: ...s IMPORTANT Leak detector must be capable of sensing HFC refrigerant 1 Connect an HCFC 22 manifold gauge set high pressure hose to the vapor valve service port NOTE Normally the high pressure hose is...

Page 11: ...if there is a rapid rise in sure indicates a relatively large leak If this occurs repeat the leak testing procedure NOTE The term absolute pressure means the total actual pressure within a given volu...

Page 12: ...ground NOTE For proper voltages select thermostat wire gauge per the following table Table 5 Wire Run Lengths Wire run length AWG Insulation type Less than 100 feet 30 m 18 Color coded with a minimum...

Page 13: ...must be grounded in accordance with national and local codes NOTE For use with copper conductors only Refer to unit rating plate for minimum circuit ampacity and maximum over current protection size...

Page 14: ...you have consulted with the power company and the voltage condition has been corrected 6 Set the thermostat for a cooling demand Turn on power to the indoor indoor unit and close the outdoor unit disc...

Page 15: ...the unit during warm weather use one of the following procedures CHARGE USING THE SUBCOOLING METHOD OUTDOOR TEMPERATURE 65 F 18 C When the outdoor ambient temperature is below 65 F 18 C use the subcoo...

Page 16: ...mperature F C Outdoor Temperature F C Approach Temperature F C Model 018 024 030 036 042 048 060 F C 7 3 9 8 4 4 9 5 13 7 2 7 3 9 9 5 7 3 9 NOTE For best results use the same electronic thermome ter t...

Page 17: ...es two components a defrost thermostat and a defrost control board DCB DEFROST THERMOSTAT The defrost thermostat as illustrated in figure 27 is located on the liquid line between the CTXV and the dist...

Page 18: ...gure 29 DS1 and DS2 Diagnostic LEDs The DCB uses two LEDs DS1 and DS2 for diagnostics The LEDs flash a specific sequence according to the condition Table 10 DS1 and DS2 LED Codes Defrost Control Board...

Page 19: ...occasional sounds that may occur while the unit is cycling in and out of the defrost mode When a jumper is installed on the DELAY pins the compressor will be cycled off for 30 seconds going in and out...

Page 20: ...n operation 4 Electronic Air Cleaner Some systems are equipped with an electronic air cleaner designed to remove airborne particles from the air passing through the cleaner If your system is so equipp...

Page 21: ...er operates only when the thermostat calls for heating or cooling This mode is generally preferred when humidity control is a priority The ON or CONT mode provides continuous indoor blower operation r...

Page 22: ...r Temperature HEATING MODE Vapor Pressure Liquid Pressure Supply Air Temperature Ambient Temperature Return Air Temperature System Refrigerant Charge Refer to manufacturer s information on unit or ins...

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