Payne PH16NA Installation Instructions Manual

Installation Instructions

NOTE: Read the entire instruction manual before starting the
installation.

SAFETY CONSIDERATIONS

Improper installation, adjustment, alteration, service, maintenance,
or use can cause explosion, fire, electrical shock, or other

conditions which may cause death, personal injury, or property
damage. Consult a qualified installer, service agency, or your

distributor or branch for information or assistance. The qualified
installer or agency must use factory-authorized kits or accessories

when modifying this product. Refer to the individual instructions
packaged with the kits or accessories when installing.

Follow all safety codes. Wear safety glasses, protective clothing,
and work gloves. Use quenching cloth for brazing operations.

Have fire extinguisher available. Read these instructions
thoroughly and follow all warnings or cautions included in
literature and attached to the unit. Consult local building codes and

current editions of the National Electrical Code ( NEC ) NFPA 70.
In Canada, refer to current editions of the Canadian electrical code

CSA 22.1.

Recognize safety information. This is the safety-alert symbol Z_.
When you see this symbol on the unit and in instructions or
manuals, be alert to the potential for personal injury.

Understand these signal words; DANGER, WARNING, and
CAUTION. These words are used with the safety-alert symbol.

DANGER identifies the most serious hazards which will result in
severe personal injury or death. WARNING signifies hazards

which could result in personal injury or death. CAUTION is used
to identify unsafe practices which may result in minor personal

injury or product and property damage. NOTE is used to highlight
suggestions which will result in enhanced installation, reliability, or

operation.

4. Leave some slack between structure and unit to absorb vi-

bration.

5. When passing refrigerant tubes through the wall, seal open-
ing with RTV or other pliable silicon-based caulk. (See Fig.

1.)

6. Avoid direct tubing contact with water pipes, duct work,
floor joists, wall studs, floors, and walls.

7. Do not suspend refrigerant tubing from joists and studs with
a rigid wire or strap which comes in direct contact with

tubing.(See Fig. 1.)

8. Ensure that tubing insulation is pliable and completely sur-
rounds vapor tube.

9. When necessary, use hanger straps which are 1 in. wide and
conform to shape of tubing insulation. (See Fig. 1.)

10. Isolate hanger straps from insulation by using metal sleeves
bent to conform to shape of insulation.

ELECTRICALSHOCK HAZARD
Failure to follow this warning could result in personal injury

or death.
Before installing, modifying, or servicing system, main

electrical disconnect switch must be in the OFF position.
There may be more than 1 disconnect switch. Lock out and
tag switch with a suitable warning label.

INSTALLATION RECOMMENDATIONS

NOTE: In some cases noise in the living area has been traced to
gas pulsations from improper installation of equipment.

1. Locate unit away from windows, patios, decks, etc. where
unit operation sound may disturb customer.

2. Ensure that vapor and liquid tube diameters are appropriate
for unit capacity.

3. Run refrigerant tubes as directly as possible by avoiding un-
necessary turns and bends.

1_254mm/_l I'__

MIN _ LIQUID TUBE

SUSPENSION

A07588

Fig. 1 - Connecting Tubing Installation

When outdoor unit is connected to factory-approved indoor unit,
outdoor unit contains system refrigerant charge for operation with

AHRI rated indoor unit when connected by 15 ft. (4.57 m) of
field-supplied or factory accessory tubing. For proper unit
operation, check refrigerant charge using charging information

located on control box cover and/or in the Check Charge section of
this instruction.

IMPORTANT: Maximum liquid-line size is 3/8-in. OD for all
residential applications including line line.

IMPORTANT: Always install the factory-supplied liquid-line
filter drier. Obtain replacement filter driers from your distributor or

branch.

INSTALLATION

Check Equipment and Job Site

Unpack Unit

Move to final location. Remove carton taking care not to damage
unit.

Inspect Equipment
File claim with shipping company prior to installation if shipment

is damaged or incomplete. Locate unit rating plate on unit corner
panel. It contains information needed to properly install unit,

Check rating plate to be sure unit matches job specifications,

Install on a Solid, Level Mounting Pad

If conditions or local codes require the unit be attached to pad, tie
down bolts should be used and fastened through knockouts

provided in unit base pan. Refer to unit mounting pattern in Fig. 2
to determine base pan size and knockout hole location,

For hurricane tie downs, contact distributor for details and PE
Certification (Professional Engineer), if required,

On rooftop applications, mount on level platform or frame. Place
unit above a load-bearing wall and isolate unit and tubing set from

structure. Arrange supporting members to adequately support unit
and minimize transmission of vibration to building. Consult local
codes governing rooftop applications.

Roof mounted units exposed to winds above 5 mph (8,05 kin/h)
may require wind bafiles. Consult the Service Manual -

Residential Split System Air Conditioners and Heat Pumps for
wind bafi]e construction,

NOTE: Unit must be level to within -2°(-3/8 in./ft,-9.5 nm:/m.)
per compressor manufacturer specifications.

Clearance Requirements

When installing, allow sufficient space for airflow clearance,
wiring, refrigerant piping, and service. Allow 24 in. (609.6 ram)

clearance to service end of unit and 48 in. (1219.2 mm) (above
unit. For proper airflow, a 6-in. (152.4 ram) clearance on 1 side of

unit and 12-in. (304.8 ram) on all remaining sides must be
maintained. Maintain a distance of 24 in. (609.6 ram) between

units. Position so water, snow, or ice from roof or eaves cannot fall
directly on unit.

On rooftop applications, locate unit at least 6 in. (152.4 ram)
above roof surface.

3/8-in. (9.53 mm) Dia.
Tiedown Knockouts in

Basepan(2) Places

Operating Ambient

The n:ininmm outdoor operating ambient in cooling mode is 55°F
(12.78°C), and the maximum outdoor operating ambient in cooling

mode is 120°F (48.89°C). The n:axinmm outdoor operating

ambient in heating mode is 66°F (18.89°C).

NOTE: Units operating at high stage operation, 208v (or below)
line voltage, and at an outdoor ambient of 120°F (48.9°C) (or
greater), may experience compressor thermal trip.

Check Defrost Thermostat

Check defrost thermostat to ensure it is properly located and

securely attached. There is a liquid header with a brass distributor

and feeder tube going into outdoor coil. At the end of the one of
the feeder tubes, there is a 3/8 in. O.D. stub tube approximately 2
in. long. (See Fig. 3.) The defrost thermostat should be located on

stub tube. Note that there is only one stub tube used with liquid
header, and on most units it is the bottom circuit.

FEEDER TUBE

STUB TUBE

DEFROST D
THERMOSTAT

A97517

Fig. 3 - Defrost Thermostat Location

Elevate Unit

[:NIT OPERATION HAZARD
Failure to follow this caution may result in equipment

damage or improper operation.
Do not allow water and/or ice to build up in base pan.

Elevate unit per local climate and code requirements to provide
clearance above estimated snowfall level and ensure adequate

drainage of unit.

View From Top

UNIT BASE PAN TIEDOWN KNOCKOUT LOCATIONS in. (mm)

Dimension in. (mm) A B C

35 X 35

(889 X 889) 9-1/8 (231.8) 6-9/16 (166.7) 28-7/16 (722.3)

Fig. 2 - Tiedown Knockout Locations

[:NIT OPERATION HAZARD

Failure to follow this caution may result in equipment
damage or improper operation,

l

Locate the unit in such a way that it is stable in all
circumstances including adverse weather conditions,

A05177

Table 1 - Accessory Usage

Accessory LONG LINE APPLICATIONS* SEA COAST APPLICATIONS (Within 2

Accumulator Standard Standard

Compressor Start Assist Capacitor and Relay Yes No

Crankcase Heater Standard Standard

Evaporator Freeze Thermostat No No

Hard Shutoff TXV Yes Yes

Isolation Relay No No

Liquid Line Solenoid Valve See Long-Line Application Guideline No

Support Feet Recommended Recommended

For tubing line sets between 80 and 200 ft. (24.38 and 60.96 m) and/or 20 ft. (6.09 m) vertical differential, refer to Residential Piping and Longline Guideline.

(Standard with factory-approved indoor unit)

REQUIRED FOR

REQUIRED FOR

miles / 3.22 km)

In Long-Line Applications, Install Liquid-Line

Solenoid Valve (LSV)

For refrigerant piping arrangements with equivalent lengths greater
than 80 ft. (24.38 m) and/or when elevation difference between

indoor and outdoor unit is greater than ---20 ft. (---6.10 m), follow
all requirements of the Residential Piping and Long-Line

Guideline. If required by Long-Line Guideline, install LSV kit,
part no. KHALSO4OILLS, specifically designed for R-410A

refrigerant heat pumps. LSV should be installed within 2 ft. (0.61
m) of outdoor unit with flow arrow pointing toward outdoor unit.
Follow the Installation Instructions included with accessory kit.

IMPORTANT: Flow arrow must point toward outdoor unit.

Make Piping Connections

PERSONAL INJURY AND ENVIRONMENTAL
HAZARD

Failure to follow this warning could result in personal iniury
or death.

Relieve pressure and recover all refrigerant before system
repair or final unit disposal.

Use all service ports and open all flow-control devices,
including solenoid valves.

Federal regulations require that you do not vent refrigerant
into the atmosphere. Recover refrigerant during system repair
or final unit disposal

[]NIT DAMAGE HAZARD

Failure to follow this caution may result in equipment damage
or improper operation.

If ANY refrigerant tubing is buried, provide a 6-in (152.4
mm). vertical rise at service valve. Refrigerant tubing lengths
up to 36-in (914.4 mm). may be buried without further special
consideration. Do not bury lines longer than 36 in (914.4 mm).

Outdoor units may be connected to indoor section using accessory
tubing package or field-supplied refrigerant grade tubing of correct

size and condition. For tubing requirements beyond 80 fl (24.4 m),
substantial capacity and performance losses can occur. Following

the recommendations in the Residential Piping and Long Line

Guideline will reduce these losses, Refer to Table 1 for accessory
requirements, Refer to Table 2 for field tubing diameters,

There are no buried-line applications greater than 36 in, (914.4
mm)

If refrigerant tubes or indoor coil are exposed to atmosphere, they
must be evacuated to 500 microns to eliminate contamination and

moisture in the system.

Outdoor Unit Connected to Factory Approved Indoor
Unit:

Outdoor unit contains the correct system refrigerant charge for
operation with factory approved, AHRI rated, indoor unit with

highest sales volume when connected by 15 ft (4.57 m) of
field-supplied or factory accessory tubing and factory-supplied
filter drier. Check refrigerant charge for maximum efficiency.

Refrigerant Tubing and Sweat Connections

Connect vapor tube to fitting on outdoor unit vapor service valves
(see Table 2). Connect liquid tubing to adapter tube on liquid

service valve, Use refrigerant grade tubing.

[]NIT DAMAGE HAZARD

Failure to follow this caution may result in equipment
damage or improper operation.

Service valves must be wrapped in a heat-sinking material
such as awet cloth while brazing.

Remove plastic retainer holding outdoor piston in liquid service
valve, leaving the piston and piston retainer inside the valve.

Connect sweat/flare adapter provided, to valve. (See Fig. 4.)

Connect refrigerant tubing to fittings on outdoor unit vapor and
liquid service valves. Service valves are closed from factory and

ready for brazing. After wrapping service valve with a wet cloth,
tubing set can be brazed to service valve using either silver bearing
or non-silver bearing brazing material. Do not use soft solder

(materials which melt below 800°F/427°C). Consult local code
requirements.

-- TEFLON ® SEAL

L SWEAT/FLARE

L PISTON

PISTON BODY

-- LIQUID SERVICE VALVE

Fig. 4 - Liquid Service Valve

ADAPTER

A05226

Table 2 - Refrigerant Connections and Recommended Liquid

and Vapor Tube Diameters (In.)

UNIT SIZE Connection Tube Connection Tube

024 3/8 3/8 3/4 3/4
036 3/8 3/8 7/8 7/8

048, 060 3/8 3/8 7/8 1-1/8

* Units are rated with 25 ft. (7,6 m) of lineset, See Product Data sheet for performance

data when using different size and length linesets,
Notes:
1, Do not apply capillary tube indoor coils to these units,

2, For Tubing Set lengths between 80 and 200 ft. (24,38 and 60,96 m) horizontal or

20 ft, (6,1 m) vertical differential, refer to the Residential Piping and Longline

Guideline using R- 410A refrigerant.

LIQUID RATED VAPOR*

Diameter Diameter Diameter Diameter

Install Liquid Line Filter Drier Indoor
Refer to Fig. 5 and install filter drier as follows:

1. Braze 5 in. (127 ram) liquid tube to the indoor coil.

2. Wrap filter drier with damp cloth.

3. Braze filter drier to 5 in. (127 ram) long liquid tube from
step 1.

4. Connect and braze liquid refrigerant tube to the filter drier.

Deep Vacuum Method
The deep vacuum method requires a vacuum pump capable of

pulling a vacuum of 500 nficrons and a vacuum gage capable of

accurately measuring this vacuum depth. The deep vacuum method

is the most positive way of assuring a system is free of air and
liquid water. A tight dry system will hold a vacuum of 1000

nficrons after approximately 7 nfinutes. See Fig. 6.

5000
4500
4000

3500 SYSTEM

z_3000
wO2500

2000

1500 iu O WET
1000

500 TIGHT

2 3 4 5 6

MINUTES

Fig. 6 - Deep Vacuum Graph

LEAK IN

DRY SYSTEM

A95424

Final Tubing Check
IMPORTANT: Check to be certain factory tubing on both indoor

and outdoor unit has not shifted during shipment. Ensure tubes are

not rubbing against each other or any sheet metal. Pay close

attention to feeder tubes, makings sure wire ties on feeder tubes are

secure and tight.
Be sure field wiring complies with local and national fire, safety,

and electrical codes, and voltage to system is within linfits shown

on unit rating plate. Contact local power company for correction of
improper voltage. See unit rating plate for recommended circuit

protection device.
NOTE: Operation of unit on improper line voltage constitutes

abuse and could affect unit reliability. See unit rating plate. Do not

install unit in system where voltage may fluctuate above or below
pernfissible linfits.

Fig. 5 - Liquid Line Filter Drier

Refrigerant tubing and indoor coil are now ready for leak testing.

This check should include all field and factory joints.

Evacuate Refrigerant Tubing and Indoor Coil

[]NIT DAMAGE HAZARD

Failure to follow this caution may result in equipment
damage or improper operation.

Never use the system compressor as avacuum pump.

Refrigerant tubes and indoor coil should be evacuated using the
recommended deep vacuum method of 500 nficrons. The alternate

triple evacuation method may be used (see triple evacuation
procedure in service manual). Always break a vacuum with dry

nitrogen.

A05227

UNIT DAMAGE HAZARD

Failure to follow this caution may result in equipment damage
or improper operation.

Installation of filter drier in liquid line is required.

Make Electrical Connections

ELECTRICAL SHOCK HAZARD

Failure to follow this warning could result in personal injury or
death.

Do not supply power to unit with compressor ternfinal box
cover removed.

NOTE: Use copper wire only between disconnect switch and unit.
NOTE: Install branch circuit disconnect of adequate size per NEC

to handle unit starting current. Locate disconnect within sight from

and readily accessible from unit, per Section 440-14 of NEC.

Route Ground and Power Wires
Remove access panel to gain access to unit wiring. Extend wires

from disconnect through power wiring hole provided and into unit
control box.

Connect Ground and Power Wires
Connect ground wire to ground connection in control box for

safety. Connect power wiring to contactor as shown in Fig. 7.

ELECTRICALSHOCK HAZARD

Failure to follow this warning could result in personal iniury or
death.

The unit cabinet must have an uninterrupted or unbroken
ground to minimize personal injury if an electrical fault should
occur. The ground may consist of electrical wire or metal
conduit when installed in accordance with existing electrical

codes,

Connect ground wire to ground connection in control box for
safety. Connect power wiring to contactor as shown in Fig. 7.

DISCONNECT
PER N. E, C. AND/OR

LOCAL CODES

FIELD POWER

WIRING

FIELD GROUND

WIRING ]

I

GROUND

Fig. 7 - Line Connections

CONTACTOR

-q)

LUG

A12257

Connect Control Wiring
Route 24v control wires through control wiring grommet and

connect leads to control wiring. See Them_ostat Installation
Instructions for wiring specific unit combinations, (See Fig. 8 and

Fig. 9.)
Use No. 18 AWG color-coded, insulated (35°( ' minimum) wire. If

thermostat is located more than 100 fl (30.5 m) from unit, as
measured along the control voltage wires, use No. 16 AWG
color-coded wire to avoid excessive voltage drop.

All wiring must be NEC Class 1 and must be separated from

incoming power leads.

Use furnace transformer, fan coil transformer, or accessory
transformer for control power, 24v/40va minimum.

NOTE: Use of available 24v accessories may exceed the
minimum 40va power requirement. Determine total transformer

loading and increase the transformer capacity or split the load with
an accessory transformer as required.

Final Wiring Check
IMPORTANT: Check factory wiring and field wire connections

to ensure terminations are secured properly. Check wire routing to
ensure wires are not in contact with tubing, sheet metal, etc.

Compressor Crankcase Heater
All sizes are equipped with a crankcase heater. Furnish power to

heater a minimum of 24 hours before starting unit. To furnish
power to heater only, set thermostat to OFF and close electrical

disconnect to outdoor unit.
A crankcase heater is required if refrigerant tubing is longer than

80 ft. (24.4 m), or when outdoor unit is 20 ft. (6.1 m) below the
indoor unit. Refer to the Residential Piping and Long Line

Guideline,

Install Electrical Accessories

Refer to the individual instructions packaged with kits or

accessories when installing.
Airflow Selections (ECM Furnaces)
The ECM Furnaces provide blower operation to match the

capacities of the compressor during high and low stage cooling
operation. Tap selections on the furnace control board enable the

installing technician to select the proper airflows for each stage of
cooling. Below is a brief summary of the furnace airflow

configurations

1. The Y2 call for high stage cooling energizes the "Cool" tap
on the control board. The grey wire from cool tap is connec-

ted to tap 5 on the motor. Refer to the furnace Product Data
to find the corresponding airflow. If the airflow setting for

high cooling needs to be switched from tap 5 to a different
tap, jumper aconnection from the cool tap to the desired tap

so that the Y2 signal iscommunicated via the cool tap to the
desired speed tap.

2. The Y1 call for low stage cooling energizes the "Fan" tap
on the control board. The red wire from the fan tap is con-

nected to tap 1 on the motor. Refer to the furnace Product
Data to find the corresponding airflow. If the airflow setting

for low cooling needs to be switched from tap 1 to a differ-
ent tap, jumper a connection from the Fan tap to the desired

tap so that the Y1 signal is communicated via the Fan tap to
the desired speed tap. The Y1 setting will also govern the

continuous fan airflow for the furnace.

Refer to the literature for the furnace for further details,
Airflow Selection for Variable Speed Furnaces

(non-communicating)

The variable speed furnaces provide blower operation to match the
capacities of the compressor during high and low stage cooling

operation. The furnace control board allows the installing
technician to select the proper airflows for each stage of cooling.

Below is a summary of required adjustments. See furnace
installation instructions for more details:

1, Turn SW1-5 ON for 400 CFM/ton airflow or OFF for 350

CFM/ton airflow, Factory default is OFF.

2, The A/C DIP switch setting determines airflow during high

stage cooling operation, Select the A/C DIP switch setting
corresponding to the available airflow shown in the furnace

Installation Instructions that most closely matches the re-
quired airflow shown in the air conditioning Product Data

for HIGH speed.

3. The CF DIP switch setting determines airflow during low
stage cooling operation. Select the CF DIP switch setting

corresponding to the available airflow shown in the furnace
installation instructions that most closely matches the re-

quired airflow shown in the air conditioning Product Data
for LOW speed. If a higher or lower continuous fan speed is

desired, the continuous fan speed can be changed using the
fan switch on the thermostat. Refer to the furnace Installa-

tion Instructions for details of how to use this feature.

Airflow Selection for FV4C Fan Coils

(non-communicating)

The FV4 provides high- and low-stage blower operation to match
the capacities of the compressor at high- and low-stage.

To select recommended airflow, refer to the FV4C Installation
Instructions. The FV4C utilizes an Easy Select control board that

allows the installing technician to select proper airflows. This fan

coil has an adjustable blower-off delay factory set at 90 sec. for
high- and low-stage blower operation.

Start-Up

PERSONAL INJURY HAZARD
Failure to follow this caution may result in personal

injury.
Wear safety glasses, protective clothing, and gloves when

handling refrigerant and observe the following:

• Front seating service valves are equipped with Schrader valves.

ENVIRONMENTAL HAZARD
Failure to follow this caution may result in environmental

damage.
Federal regulations require that you do not vent refrigerant to

the atmosphere. Recover during system repair or final unit
disposal.

(]NIT OPERATION AND SAFETY HAZARD

Failure to follow this caution may result in personal iniury,
equipment damage or improper operation.

• Do not overcharge system with refrigerant.

• Do not operate unit in a vacuum or at negative pressure.

• Do not disable low pressure switch in scroll compressor
applications.

• Compressor dome temperatures may be hot.

Follow these steps to properly start up system:

1. After system is evacuated, fully open liquid and vapor ser-

vice valves.

2. Unit is shipped with valve stem(s) front seated (closed) and
caps installed. Replace stem caps after system is opened to

refrigerant flow (back seated). Replace caps finger-tight and
tighten with wrench an additional 1/12 turn.

3. Close electrical disconnects to energize system.

4. Set room thermostat at desired temperature. Be sure set
point is below indoor ambient temperature.

5. Set room thermostat to HEAT or COOL and fan control to
ON or AUTO mode, as desired. Operate unit for 15
minutes. Check system refrigerant charge.

Thermidistat Fan Coil Heat Pump

RVS Cooling _-

Heat Stage 3 _-

Heat/Cool Stage 1 _"

Heat/Cool Stage 2 _-

Fan _-

24VAC Hot Heating ,_[_[_'"

24VAC Hot Cooling _

Dry Contact 1 _-

Dry Contact 2 _-

24VAC Common _"

Humidify I_0"-'M_ -

Outdoor Air Temp _-

Remote Room Sensor _-

OAT/RRS Com

-' ,,---1_¢-T_I-

•--J i

[i i_Hum i_1 ial_;S°len °id

-]_ Outdoor Sensor _]i
Remote Room

Sensor

Fig. 8 - Thermidistat Wiring with Fan Coil

and 2-Stage Heat Pump

-- _ J2 Jumper
f on Control Board

__ _ Remove J1 Jumper

for Dehum_d fy modes

A12258

-- 24v Factory Wiring

- - - 24v Field Wiring

z_ Field Splice Connection

Heat Stage 3 (furnace) _-

Heat/Cool Stage 1 _"

Heat/Cool Stage 2 _-

24VAC Hot Heating ,"[_"
24VAC Hot Cooling _'[_

Remote Room Sensor _-

LEGEND

Thermidistat Furnace

RVS Cooling _-

Fan _-

DQZ Contact 1 :_--
DQZ Contact 2

24VAC Common _"

Humidify _-

Outdoor Air Temp _-

OAT/RRS Corn

i i_ Hu mid_fiale_S °le n°id

Remote Room

-]_ OutdoorS ...... Zi

Sensor

,,

Fig. 9 - Thermidistat with Variable Speed Furnace

and 2-Stage Heat Pump

Heat Pump

A12259

Sequence of Operation
NOTE: Defrost control board is equipped with 5 minute lockout

timer that is initiated upon any interruption of power.
Turn on power to indoor and outdoor units. Transformer is

energized.
These models utilize a 2-stage indoor themmstat. With a call for

first (low) stage cooling or heating, the outdoor fan and low-stage
compressor are energized. If low-stage cannot satisfy cooling or

heating demand, high-stage is energized by the second (high)stage
of the indoor thermostat. After the second stage is satisfied, the

unit returns to low-stage operation until second stage is required
again. When both, first and second stage cooling or heating are

satisfied, the compressor will shut off.
Cooling

With first stage cooling, Y and O are powered on; and with second
stage cooling, Y2, Y and O are powered on. The O energizes the

reversing valve, switching it to cooling position. The Y signal
sends low voltage through the safeties and energizes the TI

terminal on the circuit board. If the compressor has been off for 5
minutes, or power has not been cycled for 5 minutes, the OF2 relay

and T2 temfinal will energize. This will close the contactor and
start the outdoor fan motor and compressor. When the cycle is

complete, Y is turned off, stopping the compressor and outdoor
fan. The 5 minute time guard begins counting. Compressor will
not come on until this delay expires. In the event of a power

interruption, the time guard will not allow another cycle for 5
minutes.

Heating

With first stage heating, Y is powered on; with second stage
heating, Y2 and Y are powered on. The Y signal sends low
voltage through the safeties and energizes the T1 terminal on the

circuit board. If the compressor has been off for 5 minutes or
power has not been cycled for 5 minutes, the OF2 relay and T2

terminal will energize. This will close the contactor and start the
outdoor fan motor and compressor.

When the cycle is complete, Y is turned off, stopping the
compressor nd outdoor fan. The 5 minute time guard begins

counting. Compressor will not come on until this delay expires. In
the event of a power interruption, the time guard will not allow
another cycle for 5 minutes.

Compressor Operation
The basic scroll design has been modified with the addition of an

internal unloading mechanism that opens a by-pass port in the first
compression pocket, effectively reducing the displacement of the

scroll. The opening and closing of the by-pass port is controlled
by an internal electrically operated solenoid. The modulated scroll

uses a single step of unloading to go from full c@acity to
approximately 67% capacity.

A single speed, high efficiency motor continues to run while the
scroll modulates between the two capacity steps. Modulation is

achieved by venting a portion of the gas in the first suction pocket
back to the low side of the compressor, thereby reducing the

effective displacement of the compressor.
Full capacity is achieved by blocking these vents, thus increasing

the displacement to 100%. A DC solenoid in the compressor
controlled by a rectified 24 volt AC signal in the external solenoid

plug moves the slider ring that covers and uncovers these vents.
The vent covers are arranged in such a manner that the compressor

operates at approximately 67% capacity when the solenoid is not
energized and 100% capacity when the solenoid is energized. The
loading and unloading of the two step scroll is done "on the fly"

without shutting off the motor between steps.
NOTE: 67% compressor capacity translates to approximately

75% cooling or heating capacity at the indoor coil.

The compressor will always start unloaded and stay unloaded for
five seconds even when the thermostat is calling for high stage

capacity.

Quiet Shift-2
Quiet shift-2 is a field selectable defrost mode (factory set to OFF),

which will reduce the occasional noise that could be heard at the
start of defrost cycle and restarting of heating cycle. It is selected

by placing DIP switch 3 on defrost board in the ON position.
When Quiet Shift-2 switch is placed in ON position, and defrost is

initiated, the following sequence of operation will occur: The
compressor will be de-energized for approximately 1 minute, then

the reversing valve will be energized. A few seconds later, the
compressor will be re-energized and the normal defrost cycle

starts.

Once defrost termination conditions have been met, the following

sequence will occur: The compressor will be de-energized for

approximately 1 minute, then the reversing valve will be

de-energized. A few seconds later, the compressor will be
re-energized and the normal heating cycle starts.
Defrost

The defrost control is a time/temperature control which has field
selectable settings of 30, 60, 90, or 120 minutes, factory set to 90

minutes. These settings represent the amount of time that must pass

after closure of the defrost thermostat before the defrost sequence

begins.
The defrost thermostat senses coil temperature throughout the

heating cycle. When the coil temperature reaches the defrost
thermostat setting of approximately 32 °F (0 °C), it will close,

which energizes the DFT terminal and begins the defrost timing
sequence. When the DFT has been energized for the selected time,

the defrost cycle begins. Defrost cycle is terminated when defrost
thermostat opens, or automatically after 10 minutes.

Defrost Speedup
To initiate a forced defrost, speedup pins (Jl) must be shorted with

a fiat head screwdriver for .5 seconds and RELEASED. If the

defrost thermostat is open, a short defrost cycle will be observed
(actual length depends on Quiet Shift-2 switch position). When

Quiet Shift-2 is off, only a short 30 second defrost cycle is

observed. With Quiet Shift-2 ON, the speedup sequence is

@proximately 3 minutes; 1 minute compressor off period followed

by 30 seconds of defrost with compressor operation. When
returning to heating mode, the compressor will turn off for an

additional 1 minute.

If the defrost thermostat is closed, a complete defrost cycle is
initiated. If the Quiet Shift-2 switch is turned on, the compressor

will be turned off for two 1 minute intervals as explained
previously.

Speedup
Pins Shift D]P s_v]tches

A05378

Fig. 10 - Defrost Control

Check Charge

Factory charge amount and desired subcooling are shown on unit
rating plate. Charging method is shown on information plate inside
unit. To properly check or adjust charge, conditions must be

favorable for subcooling charging. Favorable conditions exist
when the outdoor temperature is between 70°F and 100°F

(21.11°C and 37.78°C), and the indoor temperature is between
70°F and 80°F (21.11°C and 26.67°C). Follow the procedure

below:
Unit is factory charged for 15fl (4.57 m) of lineset. Adjust charge

by adding or removing 0.6 oz/fl (.018 kg/m) of 3/8 liquid line
above or below 15fl (4.57 m) respectively.

For standard refrigerant line lengths (80 fl/24.38 m or less), allow
system to operate in cooling mode at least 15 minutes. If conditions
are favorable, check system charge by subcooling method. If any

adjustment is necessary, adjust charge slowly and allow system to
operate for 15 minutes to stabilize before declaring a properly

charged system.
If the indoor temperature is above 80°F (26.67°C), and the

outdoor temperature is in the favorable range, adjust system charge
by weight based on line length and allow the indoor temperature to

drop to 80°F (26.67°C) before attempting to check system charge
by subcooling method as described above.

If the indoor temperature is below 70°F (21.11°C), or the outdoor
temperature is not in the favorable range, adjust charge for line set

length above or below 15fl (4.57 m) only. Charge level should then
be appropriate for the system to achieve rated capacity. The charge

level could then be checked at another time when the both indoor
and outdoor temperatures are in a more favorable range.

NOTE: If line length is beyond 80 fl (24.38 m) or greater than 20
ft (6.10 m) vertical separation, See Long Line Guideline for

special charging requirements.
Heating Check Chart Procedure

To check system operation during heating cycle, refer to the
Heating Check Chart on outdoor unit. This chart indicates whether

a correct relationship exists between system operating pressure and
air temperature entering indoor and outdoor units. If pressure and

temperature do not match on chart, system refrigerant charge may
not be correct. Do not use chart to adjust refrigerant charge.

Verify units for proper switching between low & high

sta_es

Check the suction pressures at the service valves. Suction pressure
should be reduced by 3-10% when switching from low to high

capacity.
Compressor current should increase 20-45% when switching from

low to high stage. The compressor solenoid when energized in
high stage, should measure 24vac at leads inside control box.

When the compressor is operating in low stage the 24v DC
compressor solenoid coil is de-energized. When the compressor is

operating in high stage, the 24v DC solenoid coil is energized. The
solenoid plug harness that is connected to the compressor HAS an

internal rectifier that converts the 24v AC signal to 24v DC. DO
NOT INSTALL A PLUG WITHOUT AN INTERNAL

RECTIFIER.

Unloader Test Procedure
The unloader is the compressor internal mechanism, controlled by

the DC solenoid, that modulates between high and low stage. If it
is suspected that the unloader is not working, the following

methods may be used to verify operation.

1. Operate the system and measure compressor amperage.
Cycle the unloader on and off at 30 second plus intervals at
the thermostat (from low to high stage and back to low

stage). Wait 5 seconds after staging to high before taking a
reading. The compressor amperage should go up or down

at least 20 percent.

2. If the expected result is not achieved, remove the solenoid
plug from the compressor and with the unit running and the

thermostat calling for high stage, test the voltage output at
the plug with a DC voltmeter. The reading should be 24

volts DC.

3. If the correct DC voltage is at the control circuit molded
plug, measure the compressor unloader coil resistance. The

resistance should be approximately 330 or 1640 ohms de-
pending on unloader coil supplier. If the coil resistance is

infinite or is grounded, the compressor must be replaced.

Final Checks

IMPORTANT: Before leaving job, be sure to do the following:

1. Ensure that all wiring is routed away from tubing and sheet
metal edges to prevent rub-through or wire pinching.

2. Ensure that all wiring and tubing is secure in unit before
adding panels and covers. Securely fasten all panels and
covers.

3. Tighten service valve stem caps to 1/12-turn past finger
tight.

4. Leave Owner's Manual with owner. Explain system opera-
tion and periodic maintenance requirements outlined in

manual.

5. Fill out Dealer Installation Checklist and place in customer
file.

TROUBLESHOOTING

If the compressor fails to operate with a cooling call, the table
below (Resistance table) can be used to verify if there is any

damage to the compressor windings causing system malfunction.

Table 3 - Winding Resistance

CARE AND MAINTENANCE

For continuing high performance and to minimize possible
equipment failure, periodic maintenance must be performed on this

equipment.
Frequency of maintenance may vary depending upon geographic

areas, such as coastal applications. See Users Manual for

information.

Start

(S-C)

Run

(R-C)

1.64 1.54 1.86 1.63

1.30 0.88 0.52 0.39

MAJOR COMPONENTS

2-Stage Compressor

The 2-stage compressor contains motor windings that provide
2-pole (3500 RPM) operation.

Compressor Internal Relief

The compressor is protected by an internal pressure relief (IPR)
which relieves discharge gas into compressor shell when
differential between suction and discharge pressures exceeds and

550 - 625 psi. The compressor is also protected by an internal
overload attached to motor windings.

Compressor Control Contactor

The contactor has a 24 volt coil and is controlled by Y input from
the thermostat

High and Low Pressure Switches

High and low pressure switches are provided in line with the Y
signal to the contactor for protection.

R-410AQUICK REFERENCE GUIDE

• R-410A refrigerant operates at 50-70 percent higher pressures than R-22. Be sure that servicing equipment and replacement
components are designed to operate with R-410A

• R-410A refrigerant cylinders are rose colored.

• Recovery cylinder service pressure rating must be 400 psig, DOT 4BA400 or DOT BW400.

• R-410A systems should be charged with liquid refrigerant. Use a commercial type metering device in the manifold hose when
charging into suction line with compressor operating

• Manifold sets should be 700 psig high side and 180 psig low side with 550 psig low-side retard.

• Use hoses with 700 psig service pressure rating.

• Leak detectors should be designed to detect HFC refrigerant.

• R-410A, as with other HFCs, is only compatible with POE oils.

• Vacuum pumps will not remove moisture from oil.

• Do not use liquid-line filter driers with rated working pressures less than 600 psig.

• Do not leave R-410A suction line filter driers in line longer than 72 hours.

• Do not install a suction-line filter drier in liquid line.

• POE oils absorb moisture rapidly. Do not expose oil to atmosphere.

• POE oils may cause damage to certain plastics and roofing materials.

• Wrap all filter driers and service valves with wet cloth when brazing.

• A factory approved liquid-line filter drier is required on every unit.

• Do NOT use an R-22 TXV.

• If indoor unit is equipped with an R-22 TXV or piston metering device, it must be changed to a hard shutoff R-410A TXV.

• Never open system to atmosphere while it is under a vacuum.

• When system must be opened for service, recover refrigerant, evacuate then break vacuum with dry nitrogen and replace filter
driers. Evacuate to 500 microns prior to recharging.

• Do not vent R-410A into the atmosphere.

• Do not use capillary tube coils.

• Observe all warnings, cautions, and bold text.

• All indoor coils must be installed with ahard shutoff R-410A TXV metering device.

Copyright 2012 Payne Heating & Cooling * 7310 W. Morris St. * Indianapolis, IN 46231 Edition Date: 06/12

Manufacturer reserves the right to change, at any time, specification8 and design8 without notice and without obligations,

Catalog No:IM-PH16NA-02

Replaces: IM- PH16NA- 01

10