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ManualsBrandsLennox ManualsPump UnitsLENNOX Merit Series ML17XP1 Cov twj tso kua mis kub

Dallas, Texas, USA

Page 1

THIS MANUAL MUST BE LEFT WITH THE

HOMEOWNER FOR FUTURE REFERENCE

WARNING

Improper installation, adjustment, alteration, service

or maintenance can cause property damage, personal

injury or loss of life. Installation and service must be

performed by a licensed professional HVAC installer or

equivalent, or service agency.

WARNING

To prevent serious injury or death:

1. Lock-out/tag-out before performing maintenance.

2. If system power is required (e.g., smoke detector

maintenance), disable power to blower, remove fan

belt where applicable, and ensure all controllers

and thermostats are set to the “OFF” position before

performing maintenance.

3. Always keep hands, hair, clothing, jewelry, tools, etc.

away from moving parts.

INSTALLATION

INSTRUCTIONS

HEAT PUMP

508263-01

6/2022

Merit

Series ML17XP1 Units

General

This ML17XP1 outdoor heat pump with all-aluminum coil

is designed for use with HFC-410A refrigerant only. This

unit must be installed with an approved indoor air handler

or coil. For AHRI Certied system match-ups and expand-

ed ratings, visit www.LennoxPros.com. These instructions

are intended as a general guide and do not supersede

local codes in any way. Consult authorities having jurisdic-

tion before installation.

NOTICE!

Charging information is given on the charging

procedure sticker on the unit access panel. For

more in-depth information, consult the Installation

and Service Procedures manual, available on

LennoxPros.com or through the Technical Support

department at 800-453-6669.

CAUTION

As with any mechanical equipment, contact with sharp

sheet metal edges can result in personal injury. Take

care while handling this equipment and wear gloves and

protective clothing.

IMPORTANT: Special procedures are required for clean-

ing the all-aluminum coil in this unit. See page 15 in this

instruction for information.

NOTES -

Service clearance of 30 in. (762 mm) must be maintained on one of

the sides adjacent to the control box.

Clearance to one of the other three sides must be 36 in. (914 mm).

Clearance to one of the remaining two sides may be 12 in. (305

mm) and the final side may be 6 in. (152 mm).

A clearance of 24 in. must be maintained between two units.

48 in. (1219 mm) clearance required on top of unit.

See

NOTES

See NOTES

See

NOTES

CONTROL

BOX

STEP 1 – SETTING THE UNIT – Clearances

Summary of content (16 pages)

PAGE 1
INSTALLATION INSTRUCTIONS ©2022 Lennox Industries Inc. Dallas, Texas, USA Merit® Series ML17XP1 Units HEAT PUMP 508263-01 6/2022 General This ML17XP1 outdoor heat pump with all-aluminum coil is designed for use with HFC-410A refrigerant only. This unit must be installed with an approved indoor air handler or coil. For AHRI Certified system match-ups and expanded ratings, visit www.LennoxPros.com. These instructions are intended as a general guide and do not supersede local codes in any way.
PAGE 2
IMPORTANT UNIT DIMENSIONS - INCHES (MM) Exhaust vents from dryers, water heaters and furnaces should be directed away from the outdoor unit. Prolonged exposure to exhaust gases and the chemicals contained within them may cause condensation to form on the steel cabinet and other metal components of the outdoor unit.
PAGE 3
STEP 2 – REFRIGERANT PIPING WARNING IMPORTANT If this unit is being matched with an approved line set or indoor unit coil that was previously charged with mineral oil, or if it is being matched with a coil which was manufactured before January of 1999, the coil and line set must be flushed prior to installation. Take care to empty all existing traps. Polyol ester (POE) oils are used in Lennox units charged with HFC-410A refrigerant.
PAGE 4
STEP 2 – REFRIGERANT PIPING – (Continued) 1A TYPICAL EXISTING FIXED ORIFICE REMOVAL PROCEDURE (UNCASED COIL SHOWN) 1B OR TYPICAL EXISTING EXPANSION VALVE REMOVAL PROCEDURE (UNCASED COIL SHOWN) TWO-PIECE PATCH PLATE (UNCASED COIL ONLY) DISTRIBUTOR TUBES LIQUID LINE ORIFICE HOUSING DISTRIBUTOR TUBES STUB END LIQUID LINE ORIFICE HOUSING CHECK EXPANSION VALVE TEFLON® RING TEFLON® RING FIXED ORIFICE BRASS NUT TEFLON® RING DISTRIBUTOR ASSEMBLY REMOVE AND DISCARD WHITE TEFLON® SEAL (IF PRESENT) DISTR
PAGE 5
STEP 2 – REFRIGERANT PIPING – Brazing Procedures 1 CUT AND DEBUR Cut ends of the refrigerant lines square (free from nicks or dents) and debur the ends. The pipe must remain round. Do not crimp end of the line. 2 CAP AND CORE REMOVAL Remove service cap and core from both the vapor and liquid line service ports.
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4 5 6 WRAP SERVICE VALVES To help protect service valve seals during brazing, wrap water-saturated cloths around service valve bodies and copper tube stubs. Use additional water-saturated cloths underneath the valve body to protect the base paint. FLOW NITROGEN Flow regulated nitrogen (at 1 to 2 psig) through the refrigeration gauge set into the valve stem port connection on the liquid service valve and out of the vapor valve stem port. See steps 3A, 3B and 3C on manifold gauge set connections.
PAGE 7
STEP 2 – REFRIGERANT PIPING – Install Indoor Expansion Valve This outdoor unit is designed for use in systems that include an expansion valve metering device (purchased separately) at the indoor coil. See the ML17XP1 Product Specifications bulletin (EHB) for approved expansion valve kit match-ups and application information. The check expansion valve unit can be installed internal or external to the indoor coil.
PAGE 8
STEP 3 – LEAK TEST AND EVACUATION LEAK TEST LOW HIGH MANIFOLD GAUGE SET OUTDOOR UNIT A B TO VAPOR SERVICE VALVE NOTE - Position canister to deliver liquid refrigerant. NITROGEN HFC-410A 1 CONNECT GAUGE SET A - Connect the high pressure hose of an HFC-410A manifold gauge set to the vapor valve service port. NOTE - Normally, the high pressure hose is connected to the liquid line port. However, connecting it to the vapor port better protects the manifold gauge set from high pressure damage.
PAGE 9
3 EVACUATION HIGH LOW CONNECT GAUGE SET NOTE - Remove cores from service valves (if not already done). A - Connect low side of manifold gauge set with 1/4 SAE in-line tee to vapor line service valve B - Connect high side of manifold gauge set to liquid line service valve C - Connect available micron gauge connector on the 1/4 SAE in-line tee. D - Connect the vacuum pump (with vacuum gauge) to the center port of the manifold gauge set.
PAGE 10
STEP 4 – ELECTRICAL – Circuit Sizing and Wire Routing WARNING In the U.S.A., wiring must conform with current local codes and the current National Electric Code (NEC). In Canada, wiring must conform with current local codes and the current Canadian Electrical Code (CEC). Refer to the furnace or air handler installation instructions for additional wiring application diagrams and refer to unit nameplate for minimum circuit ampacity and maximum overcurrent protection size.
PAGE 11
STEP 4 – ELECTRICAL – (Continued) – High Voltage and Field Control Wiring The following illustration provides an example of control wiring connections when using a standard thermostat. ROUTING HIGH VOLTAGE, GROUND AND CONTROL WIRING HIGH VOLTAGE / GROUND WIRES Any excess high voltage field wiring should be trimmed and secured away from any low voltage field wiring. To facilitate a conduit, a cutout is located in the bottom of the control panel.
PAGE 12
Torque Requirements When servicing or repairing heating, ventilating and air conditioning components, ensure the fasteners are appropriately tightened. Table 2 lists torque values for fasteners. TABLE 2 TORQUE REQUIREMENTS OPERATING ANGLE-TYPE SERVICE VALVE 1 - Remove stem cap with an appropriately sized wrench. 2 - Use a service wrench with a hex-head extension (3/16" for liquid line valve sizes and 5/16" for vapor line valve sizes) to back the stem out counterclockwise as far as it will go.
PAGE 13
Checking Refrigerant Charge The ML17XP1 unit is factory-charged with enough HFC410A 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 given in the ML17XP1 Installation and Service Procedures manual, which is available on LennoxPros.com.
PAGE 14
DEMAND DEFROST CONTROL (A108) DIAGNOSTIC LEDS The state (Off, On, Flashing) of two LEDs on the demand defrost control (DS1 [Red] and DS2 [Green]) indicate diagnostics conditions that are described in table 3.
PAGE 15
• Check the indoor unit drain line for obstructions monthly. The indoor coil is equipped with a drain pan to collect condensate formed as your system removes humidity from the inside air. Have your dealer show you the location of the drain line and how to check for obstructions. (This would also apply to an auxiliary drain, if installed.) • Check the area around the outdoor unit monthly and remove any obstructions that may restrict airflow to the outdoor unit.
PAGE 16
4 - Inspect the indoor coil drain pans and condensate drains for rust, debris, obstructions, leaks or cracks. Pour water in pans to confirm proper drainage from the pan through to the outlet of the pipe. Clean or replace as necessary. 5 - Inspect and clean indoor coil, if necessary. 6 - Inspect the condition of the refrigerant lines and confirm that pipes are not rubbing copper-tocopper. Also, ensure that refrigerant pipes are not being affected by indoor air contamination.