ECR R25C, R25H Installation, Operation & Maintenance Manual

TM

R25C/H

Packaged Terminal Air Conditioner (PTAC)

Packaged Terminal Heat Pump (PTHP)

Installation, Operation &

Maintenance Manual

Replacements for:

R25C - Climate Master/Friedrich ET,

Ice Cap RSet,

Islandaire EZ Series ET

ECR International, Inc.

2201 Dwyer Avenue • Utica, New York 13501
Ph: 800.325.5279 • Web: retroaire.com

P/N 240010639 Rev. A [06/15/2014]

TABLE OF CONTENTS

Receiving Information .....................................................................................................3

Important Safety Information ...........................................................................................4

R40C - Dimensional/Physical Data ....................................................................................5

Dimensional/Physical Data ............................................................................................... 6

General Product Information ............................................................................................7

Features ........................................................................................................................ 8

Installation Preparation ................................................................................................. 10

Installation .................................................................................................................. 11

Sequence of Operation .................................................................................................. 14

Final Inspection & Start-up ............................................................................................ 17

Maintenance ................................................................................................................ 24

Troubleshooting ............................................................................................................ 26

Performance Data ......................................................................................................... 27

Electrical Specications ................................................................................................. 28

AHRI Certied ™ is a

trademark of the Air-

Conditioning, Heating

and Refrigeration

Institute. These units
are tested and rated in
accordance with: AHRI

Standards 310/380

Information and specications outlined in this manual in effect at the

time of printing of this manual. ECR International reserves the right to

discontinue, change specications or system design at any time without

notice and without incurring any obligation, whatsoever.

The Right Fit for Comfort 2

UL-484

P/N 240010639, Rev. A [06/15/2014]

RECEIVING INFORMATION

Shipping damage MUST be reported to the carrier IMMEDIATELY.

Examine exterior.

Remove cover and examine compressor and piping for signs of damage.

Inspection

Check shipment against bill of lading.

Verify equipment received as ordered.

Verify unit:

• Unit size and type correct per submittal sheet and
job requirements?

• Louver color correct, if special color specied?

• Voltage correct?

• Electric heat correct capacity, if used?

Inspect each component for damage. Concealed
damage must be reported to carrier within 15 days
of receipt of shipment.

Carrier must make proper notation on delivery

receipt of all damage identied and complete carrier

inspection report.

Purchaser must notify Manufacturer’s Service

department of all damage and is responsible for ling

any necessary claims with carrier.

General Information

Installation shall be completed by qualied agency.

this manual for future reference.

Installer, review this manual to verify unit has been
installed correctly. Run unit for one complete cycle to
verify proper function.

To obtain technical service or warranty assistance
during or after installation, contact your local
representative.

When calling for assistance, please have following
information ready:

Model Number_________________________

Serial Number_________________________

Date of installation______________________

Retain

Customer Service : [phone]

3 Made in USA

P/N 240010639, Rev. A [06/15/2014]

IMPORTANT SAFETY INFORMATION

All eld wiring shall conform to requirements of authority

having jurisdiction or in absence of such requirements:

• United States - National Electrical Code, ANSI/NFPA
70

• Canada - CSA C22.1 Canadian Electrical Code Part 1.

!

WARNING

Fire, and electrical shock hazard. Improper
installation could result in death or serious injury.
Read this manual and understand all requirements
before beginning installation.

Become Familiar With Symbols
Identifying Potential Hazards.

!

DANGER

Indicates a hazardous situation which, if not
avoided, WILL result in death or serious injury.

!

WARNING

Tampering with PTAC/PTHP is dangerous and could
result in death or serious injury. Do not modify or
change this unit.

Safety Information

• Installation by qualied personnel.

• Turn off electrical supply before servicing unit.

• Inspect all parts for damage prior to installation and
start-up.

• Do not use unit if it has damaged wiring, is not
working properly, or has been damaged or dropped.

• Connect to properly grounded electrical supply with
proper voltage as stated on rating plate.

• Have proper over current protection (i.e. time delay
fuse/HACR Breaker) as listed on Rating Plate.

• Connect unit to properly grounded electrical supply.
Do not fail to properly ground this unit.

!

WARNING

Indicates a hazardous situation which, if not
avoided, could result in death or serious injury.

!

CAUTION

Indicates a hazardous situation which, if not
avoided, could result in minor or moderate injury.

NOTICE

Indicates information which should be followed to
ensure proper installation and operation.

The Right Fit for Comfort 4

P/N 240010639, Rev. A [06/15/2014]

R25C - DIMENSIONAL/PHYSICAL DATA

Figure 1 R25C/R25H Dimensions - Inches (mm)

[523mm]

20.57in

[253mm]

9.96in

[381mm]

15.00in

[51mm]

2.00in

[485mm]

19.08in

[23mm]

.90in

[484mm]

19.06in

[65mm]

2.54in

[143mm]

5.63in

[692mm]

27.25in

5 Made in USA

P/N 240010639, Rev. A [06/15/2014]

Figure 2 R25C/R25H Chassis

To use this format set your tiff output to

Print capture, 150dpi, C -Landscape, Scale to fit

for best results

Fresh Air
Switch
(FAS)

DIMENSIONAL/PHYSICAL DATA

Fan Speed

Switch (FSS)

Fan

Thermostat

Speed

Switch
(FSS)

R25 Control

Unit

5 Position
Terminal
Block

Fan Cycle
Switch
(FCS)

R25 Base Unit

High Pressure
Switch (HPS)

Line Cord

OPTIONAL:
Hydronic NO/
NC Switch Valve

Orientation

Switch (VOS)

The Right Fit for Comfort 6

P/N 240010639, Rev. A [06/15/2014]

GENERAL PRODUCT INFORMATION

Product Description

• Available in straight cooling (PTAC) or heat pump
systems (PTHP).

• Heat pumps (PTHP) reduce energy costs and operate
in mechanical heat mode down to outdoor temperature
of 40°F (4.4°C). Below 40°F (4.4°C) heating is
accomplished by an auxiliary heat option.

• Use R-410A refrigerant.

• Include high-efciency rotary compressors, protected
by a 5-year warranty.

• Include enhanced high-efciency heat exchangers.

• Offer two fan speeds.

• Incorporate positive condensate re-evaporation to

improve efciency.

• Have optional motorized fresh-air feature with positive
pressure seal.

• PTAC/PTHP units are available in nominal sizes of
9,000 Btuh, (2.6kW) 12,000 Btuh (3.5kW) or
15,000 Btuh (4.4kW).

• PTAC units (straight cooling only) are also available at
18,000 Btuh (5.3kW).

• Energy Efciency Rating (EER) as high as 9.

• Coefcient of performance (COP) ratings as high as

2.70 for heat pumps.

Standard Controls And Components

– Construction

• 20-gauge galvanized steel construction of chassis.

• Condenser bafe options to accommodate extended
wall sleeve applications.

• Powder-coated condenser and evaporator drain pan.

• Foam strip seal for supply air duct.

• Weather strip insulation.

– Air Systems

• Thermally-protected PSC type motors.

• Air-stream surfaces insulated with 1/4" ber-glass or

1/8" (3.2 mm) Volara™.

• Forward-curved type indoor fan, directly mounted to
motor shaft.

• Unit mount controls include eld selection switch
to control indoor fan by cycling with compressor
operation or continuously with the unit.

– Condensate Removal

• Outdoor fan incorporates condensate slinger ring.
Condensate is thrown onto coil, where it evaporates,
improving system performance.

• Thermostatic drain pan valve for condensate
elimination when outdoor temperature drops below
60°F (15°C), heat pump units only.

– Controls

• Unit-mounted operating controls include thermostat,
fan speed control, heat/cool switch, fan cycle switch,
fresh air switch, if equipped.

7 Made in USA

P/N 240010639, Rev. A [06/15/2014]

• Ability to utilize 1-stage or 2-stage thermostat. 2
stage thermostat is capable of activating emergency
heat if auxiliary heat source is available.

• Low ambient protection — see "Microprocessor
control board" for details.

• Ability to control normally-open or normally-closed
motor valve switch, available on hydronic heat units
only. Order valve controls for 24V or line voltage.

• All hydronic heat units include molex plugs for
connection of hydronic valve motor.

• Remote mount controls include fan speed control and
fresh air switch, if equipped.

• All units are equipped with manual reset high
pressure switch which prevents abnormal high
pressure operation, increasing compressor reliability.

– Microprocessor Control Board

• Universal control board is used in straight cooling,
electric resistance heat, hydronic heat, or cooling/
heat pump applications.

• Random start timer prevents multiple units from
simultaneous startups after power interruption or on
initial power-up.

• Fan purge — fan remains on for 60 seconds after

heat/cool is satised.

• Anti-short-cycle compressor protection prevents the
compressor from rapid cycling, increases compressor
reliability.

• Freeze-protection prevents evaporator coil freeze up,
improving compressor reliability.

• Low ambient lockout prevents compressor operation
in outdoor temperatures less than 40°F (4.4°C).
PTHP units supplied with unit-mounted control,
Control causes automatic changeover to auxiliary
heat, if installed.

• Test operation — all timers are temporarily
suppressed to allow ease of testing or
troubleshooting.

• Control board LED provides self-diagnostic
troubleshooting codes, see "Sequence of operation."

Field-Installed Accessories

• Hydronic heat — coil assembly is shipped loose for

eld installation.

• Remote wall thermostat — digital 1-stage or 2-stage
available.

• Wall sleeves, louvers, and cabinets

• Aquastat - delays fan start-up until coil reaches
100°F (38°C) to eliminate "cold" blow condition.

• Hydronic control valve , Water 2 way & 3 way

• Hydronic control valve, Steam 2 way

• Hydronic Isolation valve, 1/2 in Sweat Connection.

FEATURES

Indoor Coil Freeze Protection (Standard)

Prevents indoor coil from freeze up in cooling mode.

• Indoor coil freeze up can occur due to a dirty air lter,

restricted or poor air ow, low refrigerant charge or low

room or outdoor temperatures.

• This can cause compressor damage.

• Should freeze condition be detected, compressor and
outdoor fan switch off for minimum of three minutes

until freeze condition is satised.

• During this time the indoor fan continues to run to aid
in defrost process.

Condensate Removal (Standard)

RetroAire replacement unit, cooling operation, is designed
to eliminate condensate by slinging it onto outdoor coil.

• Condensate drains through the bulkhead to the area
near the outdoor fan.

• Unit as part of normal operation produces condensate
and collects it in the unit's base pan. It is picked up
there by the outdoor fan slinger ring and deposited onto

the condenser coil. This improves the unit’s efciency

by maintaining reduced refrigeration system pressures.

• Base pan has overow notches. If too much condensate

is produced notches allow condensate to ow out of the

base pan and into the wall sleeve out of the building.

Anti-Short Cycle Timer (Standard)

Microprocessor control uses this timing to prevent
compressor short-cycling.

• When the compressor cycles off on heating or cooling
call, controller starts a 180-second timer.

• Compressor is not allowed to start until this time has
elapsed.

• On initial power-up or after a power failure, this timing
occurs after the random start timing.

Power Cord With Integral Safety Protection
(Standard)

All PTAC/PTHP units rated 250V or less are equipped with
power cord with integral safety protection as standard.

• Providing personal shock protection as well as arcing

and re prevention. Device is designed to sense any
damage in line cord and disconnect power before a re

can occur.

• Tested in accordance with Underwriters Laboratories,
cord set offers a unique “passive” operation, meaning
unit does not require resetting if main power is
interrupted.

Thermostatic Drain Pan Valve

(Standard On

Heat Pump Units)

Heat pump models (PTHP), condensate can accumulate in
the outdoor drain pan during heat pump cycle.

• PTHP units include a thermostatic drain valve that opens
when outdoor temperatures fall below 60°F (15°C).

• When drain valve opens, condensate ows from the
drain pan onto the bottom of the wall sleeve, and drains
to the outside.

• Keeping the base pan free of condensate water, which
could freeze during colder outdoor temperatures.

Random Start Feature (Standard)

Random start feature is initiated on initial power-up or
after a power interruption.

• Controller adds a random time delay (from 5–120
seconds) on start-up, preventing compressor from
starting.

• This staggers the start of multiple units in a single
facility, preventing a large surge if all units started at
the same time.

Heat Pump

• Heat pump units are “Limited Range” and should be
equipped with back-up electric resistance or hydronic
heat.

• Limited Range heat pumps are designed to operate
when outdoor temperatures are between 70°F(21°C)
and 40°F(4.4°C) and with maximum indoor temperature
of 80°F(26.6°C).

• Unit is equipped with a reversing valve energized for
cooling and de-energized in heating mode.

• Electric heating or hydronic heat will operate using
onboard control logic below operating conditions of the
heat pump.

The Right Fit for Comfort 8

P/N 240010639, Rev. A [06/15/2014]

FEATURES

Hydronic Heating (Optional)

Hydronic heat package may be selected in lieu of electric
heat. Heating operation is same as that of units with
electric heat.

Aquastat Connection (Optional)

All replacement PTAC/PTHP's with hydronic heat are
supplied with standard line volt Aquastat connection. Field
installed Aquastat delays fan operation until hydronic coil
reaches temperature of 100°F (38°C).

Motorized Fresh Air Damper (Optional)

Motorized fresh air damper allows fresh air into the space
to be conditioned. When the Fresh Air switch is in "YES"
position, damper door is open and allows fresh air into
the space. This is only available when the indoor fan is
on. When damper door switch is in the "NO" position, the
damper door is closed and does not allow air in the space.

Optional Wall-Mounted Thermostats

PTAC/PTHP compatible thermostats.

• Manufacture offers single stage, cool/heat, thermostat
that can be used in all RetroAire cooling, heating or
heat pump applications.

• Thermostat has adjustable setpoint range of between
45°F(7°C) and 90°F(32°C).

• For heat pumps, manufacture offers a 2 stage heat/cool
thermostat which allows for emergency heat.

Selecting A Thermostat

When selecting a thermostat for the PTAC/PTHP choose a
single stage heat/cool, 24V thermostat.

Straight cooling with electric heat or hydronic heat (R10C
— PTAC's) select a thermostat compatible with a cooling/
electric heat system. Thermostat should have “R”, “Y”,
“W”, "C" and “G” terminals.

Heat Pump With Electric Heat (R__H - PTHPS)

Select a thermostat compatible with cooling/single-stage
heat/heat pump system.

Thermostat should have "R", "Y", "O" and "G" terminals.
RetroAire units are single stage heating only.

Electric heat and heat pump will not operate
simultaneously.

9 Made in USA

P/N 240010639, Rev. A [06/15/2014]

INSTALLATION PREPARATION

!

DANGER

Electrical shock hazard — Verify power to existing
unit is disconnected before removing. Failure to do
so will result in death or serious injury.

!

CAUTION

Moving parts can cause personal injury. Avoid
contact with moving parts when testing or servicing
the unit. Failure to follow these instructions could
result in minor or moderate injury.

Verify existing wall sleeve/enclosure:

1.

RetroAire PTAC/PTHP's are to be used with metal wall
sleeves.

2.

Existing front panels must be secured by screws that
prevent contact with all parts.

3.

Minor dimensions of openings must not exceed ½ inch
(12.5mm).

4.

Indoor air discharge grill must have dimensions not
less than 26” x 4”. Grill must separate top surface of
chassis from top surface of discharge grill by minimum
of 1 in (25.4mm).

5.

For all models, outdoor openings must prevent contact
of all moving parts by means of louvers or grills, with
minor dimension not exceeding 1 in (25.4mm).

Electrical Power Connection

All wiring shall conform to requirements of authority
having jurisdiction or in absence of such requirements:

• United States
National Electrical Code, ANSI/NFPA 70

UL 1995 4th Addition.

• Canada
CSA C22.1 Canadian Electrical Code Part 1.

Installer is responsible for ensuring units are installed in
accordance with all applicable national and local codes.

UNITS RATED 208/230V — RetroAire unit is wired for 230v
primary voltage from manufacture.

Transformer must be rewired by installer if job site voltage
is 208V. Change transformer tap from orange to red. See
wiring diagram for details.

1.

Verify RetroAire unit rating plate for circuit ampacity
and required breaker or fuse size.

2.

Verify existing breaker or fuse is correct size.
A. Replace breaker or fuse if incorrectly sized.
B. Breakers must be type HACR only.

3.

Cord connected units — verify wall outlet is correct

rating. Outlet's blade conguration must match that of

cord supplied with RetroAire unit.

4.

Hard-wired units — verify power wiring is correctly

sized. Inspect existing wiring for deciencies, such as
cuts or frayed wires. Replace any decient wiring if

found.

5.

Each unit must have separate branch circuit protected
by fuse or breaker. Refer to unit rating plate for proper
wire and breaker or fuse size. Use of extension cords is
prohibited.

6.

DO NOT connect RetroAire unit to circuit with
incorrectly sized overcurrent protection device.

7.

All cord-connected 265-volt units must be plugged into
receptacles within unit subbase or chassis.

8.

Open power supply disconnect switch. Secure in open
position during installation. Attach sign stating, "DO
NOT TURN ON."

9.

On a plug and receptacle connection, unplug existing
unit at the wall outlet. DO NOT plug in the new unit
until installation is complete and start-up checklist has
been completed.

Remove Old Chassis

1.

Disconnect power or unplug cord before proceeding.

2.

Remove front of the existing room enclosure to expose
old chassis.

3.

Loosen any tie-down bolts or screws. Remove old
chassis.

NOTICE

Dispose of old chassis following existing state and
federal regulations.

4.

Inspect wall sleeve/cabinet for any rust, holes, or
damage.

A. Clean wall sleeve of any dirt.
B. Repair any damage.
C. Ensure proper drainage of condensate or rainwater

to exterior of building.

5.

Remove or repair old weather seals. Note location for
installation of any new seals.

6.

Check wall sleeve/cabinet to ensure all drain holes are
open and:

A. Wall sleeve/enclosure is level left to right
B. Back is pitched to outside by ½ in (12.5mm)

maximum.

7.

Before installing new chassis, inspect outdoor louver
for minimum free area of 70% and remove any

obstructions. Obstructions restrict air ow over

condenser coil and may cause damage to the chassis.

8.

Follow the installation instructions on the following
pages.

9.

DO NOT connect power to the unit or plug in the cord
until instructions in this manual have been completed.

The Right Fit for Comfort 10

P/N 240010639, Rev. A [06/15/2014]

INSTALLATION

Installation

1.

Verify existing wall thickness. Distance from
condenser coil to outdoor louver varies with wall sleeve

depth. Units shipped with factory installed bafes.

Manufacturer offers alternate air bafe kits for unique

applications. Wall sleeve depth is required when

ordering to ensure proper bafe size.

2.

Install Bafes - Remove sets of bafes from the

kit bag supplied with unit. Install only one set of left

and right side bafes on the condenser coil. Complete

following steps:

• Choose proper tting bafes for your application.

Verify selected bafes come in contact with outdoor

louver.

• Verify bafes are directed inward toward center of coil.

See gure 3.

• Secure bafes tightly into existing holes of condenser
coil using provided screws.

3.

Install foam tape — Apply 1∕2” x 1∕2” open cell foam

strips to both weather angles, prevents outside air
from entering around the chassis to the room from the

sides. See gure 4.

Install 1" x 1" open cell foam to back of unit above
condenser coil. It is necessary to have a solid air seal
between wall sleeve and chassis. Failure to do so will
result in air leakage from outdoor to indoor causing
system problems.

4.

Connecting optional hydronic coil controls. If

hydronic heat option has been ordered, eld install

the hydronic coil on the new unit. Coil with old unit
can be located in subbase, under chassis in a special
attachment, or above chassis in a special attachment.
It is necessary to know where the coil is to be located
and physical size of the coil so the new coil can be

veried if ordered for replacement. The new coil

should be installed in the same manner as the coil it is
replacing. Hydronic coils are not factory installed and
need to be ordered.

5.

Connecting accessory eld installed Aquastat. (If
ordered)

A. Remove black jumper wire located on bottom panel

of control box. This is terminated with 2-position
connector.

B. Cut jumper wire in the middle and splice the

Aquastat to jumper using 2 - crimp popcorns.

C. Place connector back into original location. Refer to

wiring diagram on unit for details.

6.

Secure chassis — Verify all seals are in the proper

locations, correct bafes are attached to the condenser
coil, and in proper orientation. Slide unit into nal

position and tighten any tie down bolts or screws as
necessary.

7.

Hard-wired units —

A. If unit is hard wired, follow instructions on

page 8to verify existing wiring and overcurrent
protection.

B. Remove line cord wires from PTAC PTHP power

entrance terminals.

C. Route power supply wiring through a strain-

relief bushing. Connect leads to power entrance
terminals.

D. Secure strain-relief clamp.

E. If wiring is through conduit, insert conduit through

control box knockout and secure in place.

F. DO NOT turn on power until completing

instructions in "Final Inspection and Startup" on
page 17.

8.

DO NOT PLUG IN the line cord, if used. Follow
instructions in "Final Inspection and Startup" page 17.

• Remove 2-position connector assembly from kit
bag supplied with unit. This will have 2 yellow wires
attached.

• Splice 2 yellow wires to valve motor using 2 - crimp
popcorn.

• Connect this 2-position connector to 2-position
connection located on bottom of control box panel.

11 Made in USA

P/N 240010639, Rev. A [06/15/2014]

Figure 3 R25 Bafe Direction

INSTALLATION

Figure 4 - Foam Tape Installation

Bafes

Install 1/2" x
1/2" Foam Tape

The Right Fit for Comfort 12

P/N 240010639, Rev. A [06/15/2014]

INSTALLATION

Installation

1.

Verify existing wall thickness. Distance from
condenser coil to outdoor louver varies with wall sleeve

depth. Two sets of air bafes are included with each

unit to accommodate most installation requirements.

Manufacturer offers alternate air bafe kits for unique

applications. Wall sleeve depth is required when

ordering to ensure proper bafe size.

2.

Verify air supply alignment - Slide unit into wall
sleeve. Supply duct on cooling chassis should line up
with supply vent on room cabinet.

3.

Install Bafes - Slide unit out of wall sleeve.

Remove both sets of bafes from the kit bag supplied

with unit.

Install only one set of left and right side bafes on the

condenser coil. Complete following steps:

• Choose proper tting bafes for your application.

Verify selected bafes come in contact with outdoor

louver.

• Verify bafes are directed inward toward center of coil.

See gure 3.

• Secure bafes tightly into existing holes of condenser
coil using provided screws.

4.

Install Foam Tape — Apply 1∕2” x 1∕2” open

cell foam strips around supply air duct to ensure
all conditioned air is delivered into the room. See
Figure 15. Failure to do so results in recirculation of
conditioned air around the cabinet causing unit to short
cycle and coil to freeze.

Apply 1” x 1” open-cell foam strips to the weather
angle to prevent outside air from entering around
cooling chassis to the room from the sides and top of
the cabinet. Install between wall sleeve and chassis.

See gure 4. Verify a solid air seal between the wall

sleeve and the chassis. Failure to do so will result in
air leakage from outdoor to indoor causing system
problems (example — coils freezing, short cycling, and
constant running of unit).

5.

Connecting optional hydronic coil controls

If hydronic heat option has been ordered, eld install

the hydronic coil on the new unit. Coil with old unit
can be located in subbase, under chassis in a special
attachment, or above chassis in a special attachment.
It is necessary to know where the coil is to be located
and physical size of the coil so the new coil can be

veried if ordered for replacement. The new coil

should be installed in the same manner as the coil it is
replacing. Hydronic coils are not factory installed and
need to be ordered.

• Remove 2-position connector assembly from kit
bag supplied with unit. This will have 2 yellow wires
attached.

• Connect this 2-position connector to 2-position
connection located on bottom of control box panel.

6.

Connecting accessory eld installed Aquastat.

(If ordered)

A. Remove black jumper wire located on bottom panel

of control box. This is terminated with 2-position
connector.

B. Cut jumper wire in the middle and splice the

Aquastat to jumper using 2 - crimp popcorns.

C. Place connector back into original location. Refer to

wiring diagram on unit for details.

7.

Secure chassis — Verify all seals are in the proper

locations, correct bafes are attached to the condenser
coil, and in proper orientation. Slide unit into nal

position and tighten any tie down bolts or screws as
necessary.

8.

Hard-wired units —

A. If unit is hard wired, follow instructions on

page 8to verify existing wiring and overcurrent
protection.

B. Remove line cord wires from PTAC PTHP power

entrance terminals.

C. Route power supply wiring through a strain-

relief bushing. Connect leads to power entrance
terminals.

D. Secure strain-relief clamp.

E. If wiring is through conduit, insert conduit through

control box knockout and secure in place.

F. DO NOT turn on power until completing

instructions in "Final Inspection and Startup" on
page 17.

9.

DO NOT PLUG IN the line cord, if used. Follow
instructions in "Final Inspection and Startup" page 17.

13 Made in USA

P/N 240010639, Rev. A [06/15/2014]

SEQUENCE OF OPERATION

Sequence of Operation

• R_ _C units are straight cool, single stage air
conditioners available with electric or hydronic heat.

• R_ _H units are limited range, single stage heat pump.
Mechanical compression heating (heat pump mode) is
locked out at outdoor temperatures of approximately
35º F (1.7º C) and below. Below these ambient
temperatures, auxiliary electric or hydronic heat will be
used.

General

Microprocessor controlled unit. Thermostat and control
connections are made to the control board.

Two conguration jumpers are located on the board. See

Figure 5.

• Straight Cool units R_ _C, locate jumper on outside two
pins.

• Heat Pump units R_ _H, locate jumper on inside two
pins.

• Heat Pump Conguration Jumper is a 3 pin jumper.

Second conguration jumper “TEST” allows for control’s

internal timers to be by-passed for test purposes. Placing
jumper on two pins enables test mode.

Figure 5 - Control Board

TEST

Conguration

Jumper

LED

Indicator

Light

Heat

Pump

Conguration

Jumper

Table 1 - Status Codes

Status LED (Light Emitting Diode), LED1 is located
on center of board. Series of blinks communicates
board status. Between blink sequence is separation of
approximately 2 seconds. See Table 1.

Initial Power-Up or Power Restoration

• When power is applied to the unit, either for the rst
time or after a power failure, board initializes itself.

• During initialization, LED1 is lit for approximately 5
seconds.

• Following initialization, a random start timer is
initiated. Timer adds randomly selected 5-120
seconds to start-up sequence, reducing possibility of
multiple units starting at same time.

• Once random start timer has expired, 180 second
Anti-Short Cycle Timer is initiated and Processor

Board Trouble Code LED is set to blink a 2 ash code.

Timer prevents compressor from rapid cycling.

• After Anti-Short Cycle Timer expires, Processor Board
Trouble Code LED is set to blink 1 blink Trouble Code,

indicating normal operation.

R_ _C / R_ _H; Cooling Operation

Unit Mount Controls

• With System Switch [SS] set to “Cool”, and Fan Cycle
Switch [FCS] set to “On” (Continuous Fan Operation),
indoor fan motor starts.

• If Fan Cycle Switch [FCS] is set to “Off” (Cycling Fan
Operation), indoor fan motor starts with call for cooling
from internal thermostat [T’stat].

The Right Fit for Comfort 14

Trouble Code

(Blinks)

1
2
3
4
5

Status

Normal Operation

Anti-Short Cycle Timer Active

Outdoor Coil Freeze Protection

Indoor Coil Freeze Protection

Simultaneous “Y” and “W” Call

P/N 240010639, Rev. A [06/15/2014]

SEQUENCE OF OPERATION

• If equipped with Motorized Fresh Air Damper, and is
active with Fresh Air Switch [FAS], damper will open
with call for the indoor fan.

• If room temperature is below thermostat setting fan
operation continues as noted.

• If room temperature is above thermostat setting,
reversing valve is energized. Compressor and outdoor
fan start provided Anti-Short Cycle Timer has timed out
from initial power-up, power restoration or previous
compressor on cycle. Operation will continue until room

temperature satises the thermostat.

• Once room temperature falls below set point by 3º F (2º
C)compressor, outdoor fan motor and reversing valve
will de-energize.

• If FCS is set to “Off”, indoor fan continues to operate for
60 seconds after compressor stops.

• If FCS is set to “On”, indoor fan continues to operate.

• As soon as the compressor is de-energized, Anti-Short
Cycle Timer is initialized and prevents compressor from
starting again for another 180 seconds.

• While Anti-Short Cycle Timer is active, Processor Board

Trouble Code LED is set to blink a 2 ash code.

• After Anti-Short Cycle Timer expires, Processor Board
Trouble Code LED is set to blink 1 blink Trouble Code,
indicating normal operation.

NOTE:

Remote-Mount Cooling Operation depends on
features of wall-mounted thermostat. By default fan will
cycle with call for cooling.

For thermostats with AUTO / ON fan switch, fan will run
continuously if this is “ON” (Continuous Fan Operation).

Fan cycles with call for cooling if this is set to “AUTO”
(Cycling Fan Operation).

In cooling, units will not start if indoor air temperature is
60º F (15.5º C) or below or outdoor temperature is below
40º F (4.5º C).

R_ _C / R_ _ H; Heating Operation

• With System Switch [SS] set to “Heat”, and Fan Cycle
Switch [FCS] set to “On” (Continuous Fan Operation),
indoor fan motor will start.

• If Fan Cycle Switch [FCS] is set to “Off” (Cycling Fan
Operation), indoor fan motor will start with call for
heating from the internal thermostat [T’stat].

• If equipped with Motorized Fresh Air Damper, and is
active with Fresh Air Switch [FAS], damper opens with
call for indoor fan.

• If room temperature is above thermostat setting fan
operation continues as noted above.

• If room temperature is below thermostat setting,
action of the unit will depend on outdoor temperature
and freeze sensor status.

NOTE: Remote-Mount Heating Operation depends on
features of wall-mounted thermostat. By default fan will
cycle with call for Heating.

For thermostats with AUTO / ON fan switch, fan runs
continuously if this is “ON” (Continuous Fan Operation).

Fan cycles with call for heating if this is set to “AUTO”
(Cycling Fan Operation).

A. R_ _H; Mechanical Heating “Heat Pump"

• If outdoor coil temperature remains above 25º F
(-4º C), compressor and outdoor fan start provided
Anti-Short Cycle Timer has timed out from
initial power-up, power restoration or previous
compressor on cycle.

• Operation continues until room temperature

satises thermostat.

• Once room temperature rises above set point by 3º
F (2º C), compressor and outdoor fan motor will
de-energize.

• If FCS is set to “Off”, indoor fan continues to
operate for 60 seconds after compressor stops.

• If FCS is set to “On”, indoor fan continues to
operate.

• As soon as compressor is de-energized, Anti-Short
Cycle Timer is initialized and prevents compressor
from starting again for another 180 seconds.

• While Anti-Short Cycle Timer is active, Processor

Board Trouble Code LED is set to blink a 2 ash

code.

• After Anti-Short Cycle Timer expires, Processor

Board Trouble Code LED is set to ash 1 blink

Trouble Code, indicating normal operation.

B. R_ _H; Auxiliary Heating “Electric” or “Hydronic”

• If outdoor coil temperature falls to 25º F (-4º C) or
below for 180 seconds at anytime during heating
call, compressor and outdoor fan motor are de­energized and auxiliary heat is energized.

• Anti-Short Cycle Timer is initiated, prohibiting
compressor operation for 180 seconds. Processor

Board Trouble Code LED ashes 3 blink Trouble

Code, indicating auxiliary heat operation.

• Heating operation with auxiliary heat continues
until outdoor coil sensor reaches 50º F (10º C).

B.1 “Electric Heat”

A. System Switch [SS] set to “Heat”, and Fan

Cycle Switch [FCS] set to “On” (Continuous
Fan Operation), indoor fan motor starts.

B. If Fan Cycle Switch [FCS] is set to “Off”

(Cycling Fan Operation), indoor fan motor
starts with call for heating from internal
thermostat [T’stat].

15 Made in USA

P/N 240010639, Rev. A [06/15/2014]

SEQUENCE OF OPERATION

C. If unit is equipped with Motorized Fresh Air

Damper, and is activated with Fresh Air Switch
[FAS], damper opens with call for indoor fan.

D. If room temperature is above thermostat

setting fan operation continues as noted
above.

E. If room temperature is below thermostat

setting, electric heater is energized until room

temperature satises thermostat.

F. Once room temperature increases above set

point by 3º F (2º C), electric heaters are de­energize.

B.2 “Hydronic Heat”

A. If FCS is set to “On” (Continuous Fan

Operation) and unit has Aquastat, the indoor
fan and fresh air motorized damper operation
are controlled by the Aquastat.

B. If the Aquastat senses temperature of 80 ± 5º

F (26 ± 3º C) or below, the indoor fan shuts
down and the motorized damper closes fresh
air door.

C. With call for heat, signal from processor board

activates water or steam valve.

D. If unit is equipped with a eld installed

Aquastat [AS], the indoor fan start will be
delayed until the hydronic coil reaches 100
± 5 ºF (38 ± 3 ºC). The signal to the water
or steam valve will continue until the room
temperature rises above the set point by 3 ºF
(2 ºC). If the FCS is set to “Off”, the indoor
fan will continue to operate for 60 seconds or
until the hydronic coil temperature as sensed
by the Aquastat reaches 80 ± 5 ºF (26 ± 3

ºC), whichever occurs rst. If the FCS is set

to “On”, the indoor fan will de-energize if the
Aquastat senses a temperature of 80 ± 5 ºF
(26 ± 3 ºC) or below.

B.3 “Remote Wall Thermostat Controls”

Cooling and Heating operates identical to unit
mount controls.

See remote controls manual for control details.
Remote units do not use a system switch, or FCS.

The Right Fit for Comfort 16

P/N 240010639, Rev. A [06/15/2014]

FINAL INSPECTION & START-UP

Before Operating The Unit

1.

Install unit per the instructions outlined in this manual
and all applicable local and national codes.

2.

Verify electrical supply matches electrical requirements
of the unit, and unit is properly grounded.

3.

Examine control box. Verify all wire connections are
secure, and control board jumpers are in proper
positions.

4.

Verify chassis is properly tted to wall sleeve and

securely mounted to surrounding framing.

5.

Verify chassis is level: Pour water into drain pan.

Verify it ows through the drain hoses to condenser

side of unit.

6.

Verify indoor blower wheels and outdoor fan blades are
secured to their motor shafts, and rotate freely.

7.

Verify all sheet metal panels are in place and secure.

8.

Attach front panel to the existing cabinet enclosure.

9.

Verify nothing interferes with room discharge air or
return air of units.

Examples:

Check for curtains or drapes that obstruct air ow. See
gure 6 and gure 7.

Check for plush carpeting that can obstruct return air.

These types of obstructions can cause serious damage
to the chassis.

Figure 6 - Proper Air Flow Diagram

Figure 7 - Restricted Air Flow Diagram

Any obstruction of supply air, including use of deector
bafes, may cause condensate to form on louver or
cabinet. See gure 7.

For optimum performance of your PTAC/PTHP, avoid

restricting the air ow. Position of curtains or drapes

over supply air grille may cause air to recirculate without
cooling the room. Unit will short cycle and may cause

premature compressor failure. See gure 7.

17 Made in USA

P/N 240010639, Rev. A [06/15/2014]

FINAL INSPECTION & START-UP

Electrical Connections

Installation and wiring shall be in accordance with
requirements of authority having jurisdiction In absence of
such requirements refer to:

• USA- National Electrical Code, ANSI/NFPA 70.

• Canada - Canadian Electrical Code, Part I, CSA C22.1:
Safety Standard for Electrical Installations.

Units Rated 208/230V:

• RetroAire unit is wired for 230V primary voltage from
manufacturer.

• Transformer must be rewired by installer if job site
voltage is 208V.

• Change transformer tap from orange to red. See wiring
diagram for details. Wiring diagramcan be found on

inside of control door.

Setting Control Board Jumpers

Control board has two sets of factory installed jumper
pins: HP jumper and TEST jumper.

HP Jumper — selects heat pump or straight cooling.
Pins determine whether unit operates as straight cooling or

as heat pump. See gures 8 and 9.

• Jumper right pin to center pin for heat pump operation.

• Jumper left pin to center pin for straight cooling
operation.

TEST Jumper

— selects normal or test mode

Figure 8 - HP Jumper (selects heat pump or

straight cooling)

Heat Pump Mode

(Jumper center

& Bottom pins)

HP

Straight

Cool Mode

(Jumper center

HP

& Top pins)

Figure 9 - TEST jumper (selects normal or

test mode)

Normal operation

(pins not jumped)

Test mode

(pins jumped)

NOTICE

Do not leave unit operating with TEST jumper in
TEST position.

• Jumper is for testing only. See gures 8 and 10.

• When jumper pins are jumped together, all timers are
eliminated (example — anti-short cycle, purge, etc.).

• May be used for eld testing. Units are factory set with
jumper on only one pin (normal operation position).

The Right Fit for Comfort 18

P/N 240010639, Rev. A [06/15/2014]

FINAL INSPECTION & START-UP

Figure 10 TEST jumper (selects normal or

test mode)

TEST JUMPER

HEAT PUMP

JUMPER

19 Made in USA

P/N 240010639, Rev. A [06/15/2014]

FINAL INSPECTION & START-UP

Start Up

1.

Verify unit is secure and level.

2.

Heat pump units only — Verify thermostatic drain pan
valve is operating correctly. Valve should be closed if
temperature is above 60° F and open if below 60°F.

3.

Test fresh air damper, if equipped, by setting damper
door switch to "YES". Verify damper opens and allows
fresh air to be moved into the space. Set damper door

switch to "NO". Verify ow of air into the space has

stopped. Fresh air is only available when indoor fan is
operating.

4.

Verify HP jumper is set correctly for unit type, cooling

only or heat pump. See gure 7, page 9.

5.

Set TEST jumper to test mode, this disables time
delays, including anti-short-cycle and purge times. See

gure 18, page 29.

6.

Verify unit is wired correctly, including requirements on
page 10.

7.

Connect Electric power to unit.

8.

Turn unit on. Verify proper operation.

9.

Verify condensate removal:
A. Pour water into base pan.

B. Place unit in cooling mode, with condenser fan

operating, verify water is picked up by slinger ring
and thrown onto outdoor coil.

Compressor will not start until anti-short time period has
elapsed.

On power-up, there are delays for control board
initialization and random start timing. See Sequence of
Operation Section, page 14.

Unit Mounted Thermostat

Figure 11 Typical Representation - Unit Mount

Control

THERMOSTAT KNOB

Do not rotate thermostat knob back and forth from heating
to cooling.

This causes compressor to cycle on and off rapidly and will
cause damage to the compressor.

Allow compressor to remain off for at least three minutes
prior to restarting the unit.

Remote Mounted Thermostat

1.

Use thermostat to place PTAC/PTHP in COOL, HEAT, or
OFF position. Test operation in all positions.

2.

If thermostat is tted with fan switch, set as desired

places the fan in either ON, OFF, or AUTO. Test
operation in all positions.

3.

Check thermostat calibration for both heating and
cooling operation.

1.

Use system switch to place PTAC/PTHP in COOL,
HEAT, or OFF position. Test operation in all positions.

See gure 29.

2.

Use fan speed switch to place fan in LOW or HIGH
speed. Test operation in both positions for heating and

cooling. See gure 11.

3.

Test operation of Fan Cycle switch, toggle switch on
side of control box. Set switch to ON, continuous fan
operation, or AUTO, cycling with thermostat, for both
heating and cooling. Set switch in desired position.

4.

Rotate thermostat knob left to increase setpoint
temperature, or right to decrease.

• Turning unit-mounted thermostat knob to far left
produces the warmest room temperature.

• Turning thermostat knob all the way to the right
produce coolest room temperature.

• Setting can be adjusted for personal comfort. See

gure 11.

The Right Fit for Comfort 20

P/N 240010639, Rev. A [06/15/2014]

FINAL INSPECTION & START-UP

Straight Cooling PTAC's

Important Information

• Room temperature must be above 65°F (18°C) for
compressor to operate in cooling mode on PTAC's with
unit-mounted controllers.

• Room temperature must be below 85°F (29.4°C) to
energize the heater on PTAC's with unit-mounted
controllers.

• Room temperature must be below 85°F (29°C) for
hydronic heater to operate on PTAC's with unit­mounted controllers.
Hydronic valve is 24 Vac normally open valve. Should
power be interrupted, valve will default to open
position.

• When unit is rst powered up, high humidity conditions
may cause condensation to form on discharge grill.
Keep doors and windows closed to reduce humidity
allowing condensation to evaporate.

Cooling Cycle

1.

Place thermostat or system switch in COOL position.

2.

Adjust thermostat to cooler temperature until indoor
fan starts running. Compressor and outdoor fan will

turn on and cold air will begin to ow from unit.

Allow unit to continue operating to cool the room and
remove humidity.

3.

After unit starts and space gets cooler, adjust
thermostat to warmer temperature until compressor
cycles off.

4.

If a colder room temperature is desired, adjust
thermostat to cooler temperature setting, turn
compressor and both fans back on.

5.

If a warmer room temperature is desired, adjust
thermostat to warmer temperature setting.
Compressor and outdoor fan stop, indoor fan switches
off after sixty-second purge time has elapsed.

6.

Place thermostat or system switch in OFF position.
All operation will stop.

Heating Cycle — Electric Option

1.

Outdoor fan does not run during heating cycle.

2.

Place thermostat or system switch in HEAT position.

3.

Adjust thermostat for warmer temperature until
indoor fan starts running and electric heater coil starts
emitting heat.

4.

After unit starts running and space gets warmer,
adjust thermostat to cooler temperature until electric
heater turns off.

5.

If warmer room temperature is desired, adjust
thermostat to warmer temperature setting, which will
turn electric heater on.

6.

If cooler room temperature is desired, adjust
thermostat to cooler temperature setting until electric
heater turns off. Indoor fan will switch off after sixty­second purge time has elapsed.

7.

Place thermostat or system switch in OFF position. All
operation will stop.

21 Made in USA

P/N 240010639, Rev. A [06/15/2014]

Heating Cycle — Hydronic Option
Before Starting The unit:

• Verify motor valve is rated for correct voltage.

• Most RetroAire units with unit mount controls will
power a hydronic valve that is the same voltage
as the unit (ex: a unit rated 208/230v will power a
208/230v).

• Switch is provided on control box to change from NO
to NC.

• Verify wiring using wiring diagram, located on the unit,

and voltage application for the specic unit.

• Other valve congurations and voltage options are
available. Consult Technical Service if unit voltage does
not match your valve application.

Starting the unit:

1.

Place thermostat or system switch in HEAT position.

2.

Adjust thermostat to warmer temperature.

3.

A signal from processor board will activate the water or
steam valve.

4.

The motorized valve will open and allow hot water or
steam to run through the coil.

5.

Indoor fans run, blowing air through the hydronic coil

6.

If the unit is equipped with an Aquastat, the indoor fan
and motorized damper operation are delayed until the
hydronic coil reaches 100 ± 5°F (38 ± 3°C).

7.

The signal to water or steam valve continues until
room temperature rises above setpoint by 3°F (2°C).

8.

Once the area gets warmer, adjust thermostat to a
cooler temperature. The hydronic valve closes and
indoor fan switches off after sixty-second purge time
has elapsed.

9.

If warmer room temperature is desired, adjust
thermostat to warmer temperature setting, which
opens the hydronic valve and turns on the indoor fan.

10.

If cooler room temperature is desired, adjust
thermostat to cooler temperature setting. Hydronic
valve closes and indoor fan switches off after sixty­second purge time has elapsed.

11.

Place thermostat or system switch in OFF position.
All operation stops.

Testing Completion For Cooling-Only PTAC's

Operation testing is now complete.
If TEST jumper was set to test mode verify it is set back to

normal operation. See gure 10, page 19.

NOTICE

Do not leave unit operating with TEST jumper in
TEST position.

FINAL INSPECTION & START-UP

Heat Pump PTHP's

Unit is equipped with reversing valve, energized for cooling
and de-energized in heating mode.

Cooling Cycle — Heat Pump Units

1.

Place thermostat or system switch in COOL position.

2.

Adjust thermostat to cooler temperature until indoor
fan starts running. Compressor and outdoor fan will

turn on and cold air begins to ow from the unit. Let

unit continue operating to cool the room and remove
humidity.

3.

After the space gets cooler, adjust thermostat to
warmer temperature until compressor cycles off.

4.

If colder room temperature is desired, adjust
thermostat to cooler temperature setting, turning
compressor and both fans back on.

5.

If warmer room temperature setting is desired, adjust
thermostat to warmer temperature. Cooling mode
ceases and compressor and outdoor fan stop. Indoor
fan will switch off after sixty-second purge time has
elapsed.

6.

Place thermostat or system switch in OFF position. All
operation stops.

Heating Operation - Heat Pump Units — Outdoor
Temperature Above 40°F (4°C)

Heat pump units are “Limited Range” equipped with back­up electric resistance heat. Limited Range heat pumps
are designed to operate when outdoor temperatures are
between 70°F (21°C)and 40°F (4°C) and with maximum
indoor temperature of 85°F (29°C) .

When outdoor temperature falls below approximately 40°F
(4°C) unit will switch from heat pump to electric resistance
heat, or hydronic heat if optionally added.

Electric heat or hydronic heat will then remain as the heat
source until the outdoor temperatures rise above 50°F
(10°C).

RetroAire heat pumps (R_ _H) are single-stage heating
units. Electric heat and heat pump will NOT operate
simultaneously.

Room temperature must be below 85°F (29°C) for
compressor to operate in heating mode on PTHP's with
unit-mounted controllers.

5.

6.

Auxiliary Heating Operation — Heat Pump Units —
Outdoor Temperature Below 40°F (4C°) — Electric

Option

Room temperature must be below 85°F(29°C) to energize
heater on PTHP's with unit-mounted controllers.

1.

2.

3.

4.

5.

6.

Electric Heat Models

Manually reset limit switch if the limit switch opens and
de-energizes the electric heat.

To reset switch:

If cooler room temperature is desired, adjust
thermostat to cooler temperature setting. Heating
mode stops and compressor and outdoor fan stop.
Indoor fan will switch off after sixty-second purge time

has elapsed.
Place thermostat or system switch in OFF position. All

operation stops.

Place thermostat or system switch in HEAT position.
Adjust thermostat to warmer temperature until indoor
fans start running and electric coil starts emitting heat.
After space gets warmer, adjust thermostat to cooler
temperature until electric heater turns off.
If warmer room temperature is desired, adjust
thermostat to warmer temperature setting, which will
turn electric heater back on.
If cooler room temperature is desired, adjust
thermostat to cooler temperature setting until electric
heater turns off. Indoor fan will switch off after sixty­second purge time has elapsed.
Place thermostat or system switch in OFF position.

All operation stops.

• Turn power off

• Remove control box cover.

• Locate limit switch.

• Push reset button in, located on the face of the switch.

1.

Place thermostat or system switch in HEAT position.

2.

Adjust thermostat to warmer temperature setting until
indoor fan starts running. Compressor and outdoor fan

will turn on and warm air will begin to ow from unit.

3.

After space gets warmer, adjust thermostat to cooler
temperature until compressor cycles off.

4.

For warmer room temperature, adjust thermostat to
warmer temperature setting, turning indoor, outdoor
fans and compressor back on.

The Right Fit for Comfort 22

P/N 240010639, Rev. A [06/15/2014]

FINAL INSPECTION & START-UP

Auxiliary Heating Operation — Heat Pump Units —
Outdoor Temperature Below 40°F (4°C) — Hydronic

Option

Room temperature must be below 85°F (29°C) for
hydronic heater to operate on PTHP's with unit-mounted
controllers.

Hydronic valve is 24Vac normally open valve. Should power
be lost to the unit, the valve will default to open position.

1.

Place thermostat or system switch in HEAT position.

2.

Adjust thermostat to warmer temperature.

The following occurs:

• Signal from processor board activates water or
steam valve.

• Motorized valve opens and allows hot water or steam
to run through coil.

• Indoor fans run, blowing air through hydronic coil

• If unit is equipped with an Aquastat, indoor fan and
motorized damper operation is delayed until hydronic
coil reaches 100 ± 5°F (38 ± 3°C).

• The signal to the water or steam valve will continue
until the room temperature rises above the setpoint
by 3°F (2°C).

• After space gets warmer, hydronic valve will close
and indoor fan will switch off after sixty-second
purge time has elapsed.

3.

After space gets warmer,
temperature setting,
indoor fan will switch off after sixty-second purge time
has elapsed.

4.

If warmer room temperature is desired, adjust
thermostat to a warmer temperature setting, which will
open hydronic valve and turn on the indoor fan.

5.

If cooler room temperature is desired, adjust
thermostat to cooler temperature setting. Hydronic
valve will close and indoor fan will switch off after
sixty-second purge time has elapsed.

6.

Place the thermostat or system switch in the OFF
position. All operation stops.

Testing Completion For Heat Pumps

Operation testing is complete.
If TEST jumper was set to test mode verify it is set back to

normal operation. See gure 11, page 19.

adjust thermostat to cooler

hydronic valve will close and

23 Made in USA

P/N 240010639, Rev. A [06/15/2014]

MAINTENANCE

!

WARNING

Electrical shock hazard. Disconnect power to unit
before servicing or accessing control compartment.
Failure to do follow these instructions could result in
death or serious injury.

NOTICE

Perform regular service and maintenance by

qualied service agency at least once every 12

months to assure safe, trouble free operation and

maximum efciency.

NOTICE

Verify proper operation after servicing.

Maintenance Schedule

Manufacturer recommends performing following
inspections and maintenance on monthly basis. Units
installed in harsh or dirty environments will require more
frequent inspections and maintenance.

Disconnect power to unit and remove necessary access
panels:

☐ Clean or replace indoor air lter.

☐ Inspect chassis interior for rodent or insect infestation.

Clean if necessary.

☐ Clean & ush condensate drain pan and chassis base pan.

☐ If applicable, verify condensate drain is functioning

properly.

☐ Inspect refrigeration tubing, especially braze joints, for

signs of refrigerant leaks (oil residue). Repair if necessary.

☐ Inspect indoor and outdoor coils. Verify dirt or debris

have not collected on ns. Clean if necessary. Take care
not to damage coil ns when cleaning. Use n comb to
straighten any bent ns.

☐ Examine control box. Verify all wire connections are

secure.

☐ Verify indoor blower wheels and outdoor fan blades are

secured to their motor shafts.

☐ Verify dirt or debris have not collected on indoor blower

wheels and outdoor fan blades. Use vacuum and soft
brush to clean if necessary.

☐ Verify any ductwork connected to unit is secure and free

of air leaks.

☐ ELECTRIC HEAT MODELS — in event the limit switch

opens and de-energizes the electric heat, limit switch

will need to be manually reset. See gure 12.

switch:

• Remove the control box cover.

• Locate the limit switch.

• Push in the reset button on the face of the
switch.

To reset

Figure 12 - Manual Reset Limit Switch

Reset Button

*Note:

Button will pop
out when limit
switch opens. Push
in to reset.

Seasonal Start-Up And Maintenance

Beginning of cooling and heating seasons, complete
mechanical check should be performed and maintenance/
inspections performed as described below.

Disconnect power to unit and remove necessary access
panels:

1.

Remove access panel. Visually inspect equipment.
Look for obvious changes in unit such as damaged coils
or evidence of extended wear on any moving parts.

2.

Check for unusual odors or leaks (examples: burnt
motor windings, water, or refrigerant). Verify base pan
is clean.

3.

Clean or replace return air lter as needed. Check lter

at least once month. Some environments may require
more frequent replacement, depending on particulate
in air stream.

4.

Inspect all electrical connections for frayed wires and
poor connections.

5.

Check fan motors and blower assemblies. Verify screws
and motor mounting hardware are tight.

6.

Centrifugal fan blades and blower cage brush and/or
vacuum as necessary.

7.

Inspect both indoor and outdoor coils. Use n comb to
straighten out any damaged ns.

NOTICE

Do not use solvent based cleaner to clean coils,
some solvents will produce noxious odor when unit
is in operation or may deteriorate components.

8.

Look for oil leaks or stains on or around all braze joints
and refrigerant lines. Presence of oil here indicates
potentially serious problem, such as refrigerant leak.

9.

Inspect and clean drain pan and drain line(s). Use of
anti-fungicide tablet to keep condensate system free
from bacterial contaminants is recommended.

10.

Verify unit is level for proper operation. Building and
equipment may settle, causing shift in direction of

condensate ow. Verify weep holes along rear ange of

base pan are free of debris.

The Right Fit for Comfort 24

P/N 240010639, Rev. A [06/15/2014]

MAINTENANCE

11.

Air leaks may make the conditioned area
uncomfortably drafty or produce noises. Visually
inspect foam gasket between wall and unit, taking
note of separation between air inlet for condenser
and condenser coil discharge. These two areas must
be sealed off from each other. If you experience poor
cooling operation or erratic operation, check for air
recirculation at condenser coil.

12.

Replace access panels and reconnect electrical power.

Troubleshooting Sensors

1.

2.

Table 2 - Sensor Resistance Values

Heat Pump Units — Temporary Emergency

Heating Mode

Heat pump failure, control board can be forced into electric
heat mode.

This is temporary solution until heat pump system
can be repaired.

1.

Locate circuit board in control section of the unit.

2.

Locate terminals where outdoor sensor connects to the
circuit board.

3.

Using small needle nose type pliers, disconnect one
side of sensor from circuit board. A 2-stage thermostat
will provide Emergency heat.

4.

This will appear to circuit board as outdoor coil freeze
condition energizing the electric resistance heater on
call for heat.

5.

See "Manual Reset Limit Switch" for resetting limit

switch if needed. See gure 12 page 24.

Figure 13 - Control Board Sensor Connections

See gure 31 for location of sensor connections to the

control board.
If temperature response of indoor or outdoor sensor
is not correct, disconnect sensor from control board
and verify sensor resistance. Replace sensor if its
resistance is not close to values in the table below.

@ Ambient

T e m p e r a t u r e

77 (25°C) 10.0 K

50 (10°C) 19.9 K

35 (1.6°C) 30.0 K

30 (-1.1°C) 34.4 K

Indoor Sensor Connections

Outdoor Sensor Connections

Resistance

25 Made in USA

P/N 240010639, Rev. A [06/15/2014]

TROUBLESHOOTING

!

WARNING

Electrical shock hazard. Disconnect power to unit
before servicing or accessing control compartment.
Failure To follow these instructions could result in
death or serious injury.

Symptom Suggestion

No heat or cooling • Check to see if unit has power and if thermostat is satised. If

thermostat is not satised, call your installing contractor or service

contractor.

Thermostat calls for cooling, but
cool air is not coming out of unit.

Light on circuit board is
blinking.

Circuit board light is blinking 3
or 4 times, but there is no freeze
condition.

Thermostat is satised, but fan

is still running.

Thermostat calls for heat, but no
heat comes out of unit.

Thermostat calls for heat while in
heat pump mode, but heated air
is not coming out of unit.

• Check for continuity between thermostat and unit. Verify 24Vac is
present across terminals C and R.

• Verify high pressure switch located in outdoor section has not been
tripped. If tripped, press switch button to restart compressor.

• Note: If evaporator fan is operational and all of above suggested
procedures have been followed, and there is still no cooling being
supplied by unit, contact trained heating and cooling professional.

• Circuit board uses light for diagnostic purposes. Blinking codes are as
follows:

– 1 blink = normal operation
– 2 blinks = compressor lockout (ASCT — Anti-short cycle timer)
– 3 blinks = outdoor freeze condition
– 4 blinks = indoor freeze condition
– 5 blinks = simultaneous Y and W call (Straight cool units only)

• Verify sensors have not been damaged. Remove sensor wires from control
board and make resistance measurements, compare to following sensor
resistances. Indoor and outdoor coil sensor wires are labeled, as is control
board.

– 77°F = 10KOhms
– 50°F = 19.9KOhms
– 35°F = 30KOhms
– 30°F = 34.4KOhms

• If thermostat is set to auto mode, once thermostat is satised, fan will
stay energized for extra 60 seconds to purge unit of excess cool or warm
air in plenum.

• If thermostat fan switch is set to ON, fan will stay energized regardless

of whether thermostat is satised or not. Only way to turn fan off is to

turn unit off or turn thermostat fan switch to AUTO.

• Units equipped with electric heaters have temperature limit switch to
prevent electric heater from reaching unsafe temperatures. If after calling
for heating, heater is not energized, check for continuity across limit. If
limit is open, replace with equivalent limit switch.

• Verify unit has power or thermostat has been satised. If unit has power

and thermostat is satised, turn thermostat few degrees above room

temperature.

• While in heat pump mode, verify thermostat is not energizing O terminal.
Retroaire units are designed to work in heat pump mode when 24Vac
is present across Y and C. Verify heat pump jumper on control board
is jumping two pins labeled “HP”. See control board jumper locations,

gure 13, Page 27.

• Verify there are no freeze conditions. Refer to blinking codes question
above for more information.

Have qualied technician conduct troubleshooting

procedures.

NOTICE

The Right Fit for Comfort 26

P/N 240010639, Rev. A [06/15/2014]

Table 3 R25 C/H Performance Data

PERFORMANCE DATA

Model

R60

R_ _C 09

R_ _H 09 8,400 (2.5) 2.68

R_ _C 12 11,400 (3.3)

R_ _H 12 11,600 (3.4) 8.33 10,600 (3.1) 2.62

R_ _C 15 14,000 (4.1)

R_ _H 15 13,500 (4.0) 7.92 12,600 (3.7) 2.57

Cooling

Btuh (kW) Btuh (kW) CFM (L/s) CFM (L/s) lbs (Kg)

9,000 (2.6) 0.74 8.98

Sensible

Heat

Ratio

0.65

0.63

EER

8.47 N/A N/A

7.92 N/A N/A

Heat Pump

N/A N/A

COP

Indoor Air

Flow

340 (160) 35 (17) 140 (64)

340 (160) 50 (24) 140 (64)

325 (153) 60 (28) 140 (64)

Fresh Air

Inlet

Flow

Shipping

Weight

27 Made in USA

P/N 240010639, Rev. A [06/15/2014]

ELECTRICAL SPECIFICATIONS

Table 5 R25 - 9,000 BTU Electrical Specications

Power Supply

Volt 1–60

Compressor Fan Motor Electric Heat Unit Electrical Ratings

Volt Min RLA LRA FLA Hp

208/

230V

265V 240 3.32 18.8 0.8 0.8

197 4 22.2 0.8 0.08

Htr

Volt W HA TCA THA MCA MOCP Plug

#

0 N/A N/A N/A

208 1963 9.4 10.2 12.8 15

2

230 2400 10.4 11.2 13.14 15

208 2454 11.8 12.6 15.7

3

230 3000 13 13.8 17.3

208 2862 13.8 14.6 18.2

4

230 3500 15.2 16.0 20.0

208 4089 19.7 20.5 25.6

5

230 5000 21.7 22.5 28.2

0 N/A N/A N/A

265 3112 11.7 12.5 15.7

2

277 3400 12.3 13.1 16.3

3 265 3752 14.2 15 18.7

4 277 4100 14.8 15.6 19.5

5 N/A N/A N/A N/A N/A N/A N/A

4.8

4.12

N/A 5.8 15

20 6-20P

30 6-30P

N/A 5.0 15

20

6-15P

7-20P

Table 4 R25 - 12,000 BTU Electrical Specications

Power Supply

Volt 1–60

Volt Min RLA LRA FLA Hp

208/

230V

265V 240 4.6 20 0.8 0.125

197 5.6 29 0.8 0.125

Compressor Fan Motor Electric Heat Unit Electrical Ratings

Htr

Volt W HA TCA THA MCA MOCP Plug

#

0 N/A N/A N/A

208 1963 9.4 10.2 12.8 15

2

230 2400 10.4 11.2 14.0 15

208 2454 11.8 12.6 15.7

3

230 3000 13 13.8 17.3

208 2862 13.8 14.6 18.2

4

230 3500 15.2 16.0 20.0

208 4089 19.7 20.5 25.6

5

230 5000 21.7 22.5 28.2

0 N/A N/A N/A

265 3112 11.7 12.5 15.7

2

277 3400 12.3 13.1 16.3

265 3752 14.2 15 18.7

3

277 4100 14.8 15.6 19.5

5 N/A N/A N/A N/A N/A N/A N/A

N/A 7.8 15

6.4

N/A 6.6 15

5.4

6-15P

20 6-20P

30 6-30P

7-20P

20

The Right Fit for Comfort 28

P/N 240010639, Rev. A [06/15/2014]

ELECTRICAL SPECIFICATIONS

Table 6 R25C - 15,000 BTU Electrical Specications

Power Supply

Volt 1–60

Compressor Fan Motor Electric Heat Unit Electrical Ratings

Volt Min RLA LRA FLA Hp

208/

230V

265V 240 6.0 28.0 0.8 0.125

197 7.4 33 0.8 0.125

Htr

Volt W HA TCA THA MCA MOCP Plug

#

0 N/A N/A N/A

208 1963 9.4 10.2 12.8 15

2

230 2400 10.4 11.2 14.0 15

208 2454 11.8 12.6 15.7

3

230 3000 13 13.8 17.3

208 2862 13.8 14.6 18.2

4

230 3500 15.2 16.0 20.0

208 4089 19.7 20.5 25.6

5

230 5000 21.7 22.5 28.2

0 N/A N/A N/A

265 3112 11.7 12.5 15.7

2

277 3400 12.3 13.1 16.3

265 3752 14.2 15 18.7

3

277 4100 14.8 15.6 19.5

5 N/A N/A N/A N/A N/A N/A N/A

N/A 10.1 15

8.2

N/A 8.3 15

6.8

6-15P

20 6-20P

30 6-30P

7-20P

20

Table 7 R25H - 15,000 BTU Electrical Specications

Power Supply

Volt 1–60

Volt Min RLA LRA FLA Hp

208/

230V

265V 240 5.6 28.0 0.8 0.125

197 6.6 33 0.8 0.125

Compressor Fan Motor Electric Heat Unit Electrical Ratings

Htr

Volt W HA TCA THA MCA MOCP Plug

#

0 N/A N/A N/A

208 1963 9.4 10.2 12.8 15

2

230 2400 10.4 11.2 14.0 15

208 2454 11.8 12.6 15.7

3

230 3000 13 13.8 17.3

208 2862 13.8 14.6 18.2

4

230 3500 15.2 16.0 20.0

208 4089 19.7 20.5 25.6

5

230 5000 21.7 22.5 28.2

0 N/A N/A N/A

265 3112 11.7 12.5 15.7

2

277 3400 12.3 13.1 16.3

265 3752 14.2 15 18.7

3

277 4100 14.8 15.6 19.5

5 N/A N/A N/A N/A N/A N/A N/A

N/A 9.1 15

7.4

N/A 7.8 15

6.4

6-15P

20 6-20P

30 6-30P

7-20P

20

29 Made in USA

P/N 240010639, Rev. A [06/15/2014]

ELECTRICAL SPECIFICATIONS

LEGEND

RLA Rated Load Amps

FLA Full Load Amps

Hp Horse Power

W Watts

HA Heater Amps

TCA Total Cooling Amps

THA Total Heating Amps

MCA Minimum Circuit Amps

MOCP Maximum Over Current Protection

The Right Fit for Comfort 30

P/N 240010639, Rev. A [06/15/2014]

LIMITED PRODUCT WARRANTY

RetroAire offers to the original purchaser/owner that under normal use and maintenance for comfort cooling and

conditioning applications, all RetroAire equipment will be free from defects in material and workmanship for a period of 12
months from the documented date of original installation or 18 months from the date of manufacture, if the documented
date of original installation is not available. Unit compressors shall be free from defects in materials and workmanship
under normal use and maintenance for a period 60 months from the documented date of original installation or 66 months
from the date of manufacture, if the documented date of original installation is not available.

WHAT RETROAIRE WILL WARRANT:

ECR will provide a replacement for or, at the discretion of RetroAire, repair any functional component that proves to be
defective in material or workmanship, under normal maintenance and operating conditions, within the prescribed warranty
period. Said parts will be supplied via standard shipping; billed and then credited back, when the defective component is
returned, at the sole discretion of RetroAire. However, the replacement cost shall NOT include labor or service costs to
diagnose, remove, or install a warranty part, or return of defective materials, at the sole discretion of RetroAire.

WHAT RETROAIRE WILL NOT WARRANT:

Damages to or arising from: misapplication, improper installation or service; components not supplied or approved by
RetroAire, including, without limitation, cabinetry, wall sleeves, louvers, internal components, equipment, or controls
supplied by others; and lack of preventative maintenance such as, but not limited to, replacing air filters, general cleaning,
clearing condensate drains, air flow adjustments; products manufactured or distributed by RetroAire but installed outside
the United States and Canada; unauthorized alteration, application or improper operation; excessively corrosive
installation environments; equipment usage during construction; shipping or handling.

RETROAIRE IS ALSO NOT RESPONSIBLE FOR:

Damages caused by faulty or interrupted power supply or electrical service; Damages caused by acts of God including,
but not limited to, wind, hail, floods, lightning, earthquakes or other conditions beyond the control of RetroAire.

FURTHER LIMITATIONS:

All implied warranties of merchantability and/or fitness for any particular purpose are limited in duration to the period of the
limited warranty. The rights and remedies provided herein are exclusive and constitute the entire contract. This limited
warranty and any optional extended warranties are granted only to the original owner/user. This warranty becomes null
and void if payment for the goods or product is in default. Warranty remedies may be withheld if the customer account is
in arrears or default.

In no event shall RetroAire be liable (whether for breach of this limited warranty or contract, for strict liability for
negligence, or otherwise), for any special, incidental, punitive or consequential damages, including, without limitation,
damages for loss of profits, loss of goodwill, loss of time or convenience, loss of use of the product, the cost of a product
rental, costs of gasoline, electricity, telephone, travel or lodging, or the loss of personal or commercial property, whether
or not RetroAire has been advised of the possibility of any such damages.

In no event shall RetroAire’s obligations under this limited warranty exceed the purchase price of the product.

Any repairs performed under this limited warranty shall not in any way extend the statute of limitations for claims under
this limited warranty.

No agent, representative or distributor of RetroAire has any authority to alter the terms of this limited warranty in any way.

For Service or Repair:

1) Contact the installing contractor

2) Call the nearest RetroAire sales rep/distributor

3) Call, E-Mail or write:

RetroAire, c/o ECR International, Inc., 2201 Dwyer Avenue, Utica, NY 13501, Ph: 1-800-325-5479

Fax: [phone], E-Mail: [e-mail], Web: www.RetroAire.com.

31 Made in USA

P/N 240009782 Rev B (9/2013)

P/N 240010639, Rev. A [06/15/2014]

TM

ECR International, Inc.

2201 Dwyer Avenue • Utica, New York 13501
Phone: [phone] • Web: retroaire.com

P/N 240010xxx, Rev. A [05/12/2014]