Pentax DR65VPIAQ, DR65RH, DR65A1000, DR65A2000, DR65 Installation Information

TrueDRY™ DR65

PROFESSIONAL INSTALLATION GUIDE

GUIDE D’INSTALLATION PROFESSIONNELLE

GUÍA DE INSTALACIÓN PROFESIONAL

INCLUDED IN THIS BOX

A

B

C

D

TrueDRY™ DR65

PROFESSIONAL INSTALLATION GUIDE

GUIDE D’INSTALLATION PROFESSIONNELLE

GUÍA DE INSTALACIÓN PROFESIONAL

INCLUDED IN THIS BOX

OPTIONAL CONTROLS SOLD SEPARATELY

Tools required to install TrueDRY DR65

TrueDRY™ DR65 (1)

3/8-in. hex drive

Drill or duct cutting tool

8-in. duct collar (2)

Wire stripper/cutter

MERV 11 Filter (1)

Standard screwdriver

Installation Guide

Duct tape

Prestige Comfort System (wireless)

8-in. round duct and starter collar

18-22 gauge, 5 band thermostat wire

TruelAQ

1/2-in. diameter drain line (8 ft.)

H8908 Manual Dehumidistat

1/2-in. drain clamps (2)

VisionPRO IAQ control

3/4-in. male NPT drain outlet

Options

1/2-in. drain p-trap (may be required by local code)

Drain pan

Float switch or water sensor (normally closed)

E	OPTIONAL CONTROLS SOLD SEPARATELY

E1

E2

E3

E4

Tools required to install TrueDRY DR65

3/8-in. hex drive

Drill or duct cutting tool

Wire stripper/cutter

Standard screwdriver

Duct tape

8-in. round duct and starter collar

18-22 gauge, 5 band thermostat wire

1/2-in. diameter drain line (8 ft.)

1/2-in. drain clamps (2)

3/4-in. male NPT drain outlet

Options

1/2-in. drain p-trap (may be required by local code) Drain pan

Float switch or water sensor (normally closed)

A B C D

E1 E2 E3 E4

TrueDRY™ DR65 (1) 8-in. duct collar (2) MERV 11 Filter (1) Installation Guide

Prestige Comfort System (wireless) TruelAQ

H8908 Manual Dehumidistat VisionPRO IAQ control

69-2089EFS-12

Installation Checklist

Included in This Box

ATrueDRY™ DR65 (1)

B8-in. duct collar (2)

CMERV 11 Filter (1)

DInstallation Guide

Control Options (Sold separately)

E1 Prestige Comfort System (wireless)

E2 True IAQ

E3 H8908 Manual Dehumidistat

E4 VisionPro IAQ Control

Tools Required (Not Supplied)

•3/8-in. hex drive

•Drill or duct cutting tool

•Wire stripper/cutter

•Standard screwdriver

•Duct tape

•8-in. round duct and starter collar

•18-22 gauge, 5 band thermostat wire

•1/2-in. diameter drain line (8 ft.)

•1/2-in. drain clamps (2)

•3/4-in. male NPT drain outlet

Options

•1/2-in. drain p-trap (may be required by local code)

•Drain pan

•Float switch or water sensor

(normally closed)

Warning: Installation must be performed by a qualified service technician and must comply with local codes.

Remove power to the device before installing or servicing the device.

Failure to connect the device according to these instructions may result in damage to the device or the controls.

INSTALLATION INSTRUCTIONS BEGIN ON PAGE 1

Liste de vérification pour l’installation

Inclus dans cette boîte

ATrueDRY™ DR65 (1)

BCollet de conduite de 8 po (2)

CFiltre MERV 11 (1)

DGuide d’installation

Options de régulateurs (vendus séparément)

E1 Système de confort Prestige

(sans fil)

E2 True IAQ

E3 Déshumidistat manuel H8908

E4 Régulateur VisionPRO IAQ

Outils requis (non fournis)

•Tournevis cruciforme 3/8 po

•Outil de perçage ou de coupe de conduit

•Dénudeur/coupe-fils

•Tournevis normal

•Ruban adhésif

•Collet de conduit et de départ rond de 8 po

•Fil de thermostat 5 bandes calibre 18-22

•Tuyau de vidange de ½ po de dia. (8 pi)

•Attaches de tuyau de vidange de ½ po (2)

•Sortie de vidange ¾ po NPT mâle

Options

•Siphon-P de vidange d’1/2 po (peut-être requis par le code local)

•Bac de récupération

•Flotteur ou capteur d’eau

(normalement fermé)

Avertissement : L’installation doit être effectuée par un technicien d’entretien qualifié et conformément aux codes en vigueur.

Couper l’alimentation vers l’appareil avant d’installer ou de réparer cet appareil.

Un raccordement de cet appareil non conforme à ces instructions peut entraîner des dommages à l’appareil ou aux commandes.

INSTRUCTIONS D’INSTALLATION COMMENCER À LA PAGE 17

Lista de verificación para la instalación

Esta caja incluye

ATrueDRY™ DR65 (1)

BAnillo para conductos de 8 pulgadas (20,3 cm) (2)

CFiltro MERV 11 (1)

DGuía de instalación

Opciones de control (se venden por separado)

E1 Sistema de confort Prestige (inalámbrico)

E2 True IAQ

E3 Deshumidistato manual H8908

E4 Control VisionPRO IAQ

Herramientas necesarias (no se suministran)

•Impulsor de cabeza hexagonal de

3/8 pulgadas

•Taladro o herramienta cortante para conductos

•Alicates o cortadores de cables

•Destornillador estándar

•Cinta para conductos

•Conducto redondo de 8 pulgadas

(20,3 cm) y collar de arranque

•Cable de termostato calibre 18 a 22, de 5 bandas

•Línea de desagüe de ½ pulgada (1,3 cm) de diámetro (8 pies [2,4 m])

•Abrazaderas de desagüe de ½ pulgada (1,3 cm) (2)

•Tubo de desagüe NPT macho de

3/4 in

Opciones

•Trampa en P para desagüe de ½ pulgada (1,3 cm) (es posible que el código local la exija)

•Bandeja para drenaje

•Interruptor del flotador o sensor de agua (normalmente cerrado)

Advertencia: La instalación la debe realizar un técnico de reparación calificado y debe cumplir con los códigos locales.

Retire la fuente de energía del dispositivo antes de instalar o reparar el dispositivo.

Si no conecta el dispositivo según estas instrucciones, el dispositivo o los controles se pueden dañar.

LAS INSTRUCCIONES DE INSTALACIÓN COMIENZAN EN LA PÁGINA 33

TrueDRY™ DR65

ABOUT YOUR NEW DEHUMIDIFIER		MAINTENANCE
Benefits .. . . . . . . . . . . . . . . . .	2	Cleaning .. . . . . . . . . . . . . . . .	11
Maintaining Ideal Humidity . . . . . . . . . .	2	Horizontal to Vertical Conversion . . . . . . .	12
Setting the Controls. . . . . . . . . . . . .	3	Technical Description . . . . . . . . . . .	13
Control Options . . . . . . . . . . . . . .	. 3	Troubleshooting. . . . . . . . . . . . . .	13
Specifications.. . . . . . . . . . . . . . .	4	Refrigerant Charging. . . . . . . . . . . .	14
		Parts List . . . . . . . . . . . . . . . .	15
INSTALLATION		5-Year Limited Warranty. . . . . . . . . .	16
Install to Fit Your Application.. . . . . . . . .	5
Plumbing . . . . . . . . . . . . . . . . .	6
Terminal Description. . . . . . . . . . . .	7
Wiring .. . . . . . . . . . . . . . . . .	7
Checkout. . . . . . . . . . . . . . . .	10

•The TrueDRY™ DR65 is designed to be installed indoors in a space that is protected from rain and flooding.

•Install the unit with space to access the front panel for maintenance and service.

•Avoid directing the discharge air at people, or over the water in pool areas.

•If used near a pool or spa, be certain there is no chance the unit could fall into the water or be splashed, and that it is plugged into a ground fault interrupt (GFI) outlet.

•To ensure quiet operation, do not place the device directly on the structural supports of the home.

•A drain pan must be placed under the unit if installed above a living area or above an area where water leakage could cause damage.

?NEED HELP? For assistance with this product please visit http://yourhome.honeywell.com or call Honeywell Customer Care toll-free at 1-800-468-1502.

Read and save these instructions.

® U.S. Registered Trademark. Patents pending. Copyright © 2012 Honeywell International Inc. All rights reserved.

TrueDRY™ DR65 Dehumidification System 69-2089EFS—12

1

About the TrueDRY™ DR65 Dehumidifier

The Honeywell TrueDRY DR65 ensures the home is maintained at proper humidity levels through its high performance and efficiency.

Benefits

•Removes up to 65 pints (30.8 l) of water per day from the indoor air.

•Built-in humidity control requires no additional wiring to an external control. Just plug in and go! Choice of external control options also available for centrally ducted control.

•Energy Star rated.

Maintaining Ideal Humidity

Dew points and relative humidity (RH) affect the way your body senses heat. Higher humidity levels cause the air to feel much hotter than the actual temperature. When maintained properly, you can run your cooling equipment less because dehumidified air feels cooler.

WHAT THE AIR FEELS LIKE

HOW HOT THE HEAT-HUMIDITY COMBINATION MAKES IT FEEL.

EXAMPLE: AIR AT 90ºF WITH 50% RH FEELS LIKE 96ºF TO THE HUMAN BODY!

												RELATIVE HUMIDITY (PERCENTAGE)
			5		10		15		20		25		30		35		40		45		50		55		60		65		70		75		80		85		90		95		100
		0
TEMPERATUREAIR FAHRENHEIT)(DEGREES
	100	91	93		95		97		99		101		104		107		110		115		120		126		132		138		144
	95	87	88		90		91		93		94		96		98		101		104		107		110		114		118		124		130		136
	90	83	84		85		86		87		88		90		91		93		95		96		98		100		102		106		109		113		117		122
	85	78	79		80		81		82		83		84		85		86		87		88		89		90		91		93		95		97		99		102		105		108
	80	73	74		75		76		77		77		78		79		79		80		81		81		82		83		85		86		86		87		88		89		91
	75	69	69		70		71		72		72		73		73		74		74		75		75		76		76		77		77		78		78		79		79		80
	70	64	64		65		65		66		66		67		67		68		68		69		69		70		70		70		71		71		71		71		71		72

EXTREME DANGER DANGER EXTREME CAUTION CAUTION

SOURCE: TEMPERATURE - HUMIDIY INDEX WAS DERIVED BY R.G. STEADMAN, JOURNAL OF APPLIED METEOROLOGY, JULY 1979.

M27328

Ideal humidity is defined by industry experts* as being between 40-60% on an average annual basis. When indoor humidity exceeds 60%, the home is more susceptible to mold and mildew growth. TrueDRY DR65 safeguards against excessive humidity in the home year-round.

*American Society of Heating,

Refrigerating and Air Conditioning

Engineers (ASHRAE).

ASHRAE RECOMMENDED WINTER DESIGN LEVEL								OPTIMUM
								ZONE
BACTERIA
VIRUSES
FUNGI
MITES
RESPIRATORY
INFECTIONS
ALLERGIC RHINITIS
AND ASTHMA
CHEMICAL
INTERACTIONS
OZONE
PRODUCTION
0	10		20		30		40	50		60		70		80		90		100

MCR24780

2	TrueDry DR65 Dehumidification System 69-2089EFS—12

Setting the Controls

BUILT-IN HUMIDITY CONTROL: An intuitive ‘set and forget’ humidistat is built into the TrueDRY DR65 to set the humidity level right on the device. Optional external control wiring is also available. If an external dehumidistat is used, the on-board dehumidification control must be set to the Off position.

Control Options

The TrueDRY™ DR65 may be used with one of the following external controls:

Prestige® IAQ 2.0 Comfort System

•Controls both heating/cooling and dehumidification.

•Shows actual and desired humidity on an intuitive digital display.

•Wireless sensor for displaying outdoor temperature and humidity.

•Maintenance and service reminders.

•High definition color display.

VisionPRO IAQ Total Comfort System (YTH9421C1010)

•Controls both heating/cooling and dehumidification.

•Sensor included for displaying outdoor temperature.

•Intuitive user interface for easy 7-day temperature programming.

•Easy-to-read backlit digital display.

•Maintenance and service reminders.

•Controls other indoor air quality equipment.

TrueIAQ Digital Control (DG115EZIAQ)

•Automatic adjustments maintain ideal humidity.

•Sensor for displaying outdoor temperature and humidity.

•Shows actual and desired humidity settings.

•Advanced ventilation programming includes economizing and extreme condition shutdown.

•Maintenance and service reminders.

•Controls other indoor air quality equipment.

Manual Dehumidistat (H8908DSPST) and Automatic

Ventilation Controls (W8150A1001)

•Manual humidity control with intuitive comfort settings.

•Integrated humidity chart for accurate control in changing outdoor conditions.

•Automatic W8150 ventilation control to ASHRAE standard, or for continuous operation.

TrueDry DR65 Dehumidification System 69-2089EFS—12

3

Specifications

Install TrueDRY DR65 according to National Electric Codes.

Dry-Bulb Temp		Intake Humidity	Capacity (Pints/Day)
80°F (26.7°C)		60% RH	65
70°F (21.1°C)		60% RH	42
60°F (15.6°C)		60% RH	21
Home Size	Dehumidifier Capacity Required to Maintain Desired Indoor RH*
(square ft)
		60% RH Indoor		50% RH Indoor		40% RH Indoor
		(pints/day)		(pints/day)		(pints/day)
2080		49–54		55–58		71–78
2600		61–68		65–72		90–97
3120		75–82		79–86		95–110

*Based on extreme climates where outdoor humidity is 70-90% RH. For less extreme climates, larger homes can be adequately served with less capacity. Actual requirements may vary.

Dimensions in inches and (mm):

12 (305) 28-1/2 (724)

				8 INCH (203)
12
(305)				DIAMETER

M29763

Product weight: 55 lb (25 kg) Shipping weight: 65 lb (30 kg)

Shipping dimensions: 16 in. H x 15 in. W x 31 in. L Media Filter: MERV 11, 9 in. H x 11 in. W x 1 in. D

Drain connection: 3/4-in. threaded female NPT connection.

Duct connections: 8-in. round inlet and outlet. ABS plastic, compatible for connection to rigid or flexible ducting with sheet metal screws and/or tape.

Cabinet: 18 gauge galvanized steel powder-coat painted.

Insulation: R value 1

Compressor: Rotary-style, 5.8 KBTU

Refrigerant: R-410A, 15 oz.

Operating Temp Range (outside cabinet):

34ºF to 135ºF (1.1ºC to 57.2ºC)

Operating Humidity Range: 0-99% RH

Airflow versus external static pressure (0–1 in. water pressure) with collars attached

0 in.	160 CFM
0.2 in.	140 CFM
0.4 in.	120 CFM
0.6 in.	100 CFM

Input ratings

•Electrical input voltage: 120 VAC, 60 Hz nominal

•Input current: 5.2 A

Output ratings

•Power transformer to R/C terminals: 24 VAC, 0.85 A

•Energy Performance: 2.22 liters (4.7 pints) per kilowatt hour (KWH)

Standards and approval body requirements

ETL Tested per standard UL 474 ducted dehumidifier.

ENERGY STAR rated.

4	TrueDry DR65 Dehumidification System 69-2089EFS—12

Install to Fit Your Application

Flex duct is recommended in connecting to the TrueDRY DR65 collars to reduce vibration noise.

Duct Sizing: Use minimum 8-in. diameter round for duct lengths up to 25 ft. Minimum 10-in. required for lengths longer than 25 ft. Duct branches from the main inlet/exhaust should be minimum 8-in. round for 2-3 branches, and 8-in. round or larger for 4 branches or more.

Isolated Areas: Effective dehumidification may require ducting to isolated or stagnant air flow areas.

Electrical requirements:

115 VAC outlet. Ground fault interrupter (GFI) recommended.

M24745

A	Dedicated Return to Main Supply
	AIR HANDLER
	RETURN	SUPPLY
	TrueDRY
	SEPARATE
	RETURN
		(OPTIONAL)
	BACKDRAFT	GRAVITY DAMPER
	DAMPER	M33150

Ideal when…

•Access to a dedicated central return for

TrueDRY DR65 is available.

•Combined with A/C operation; requires backdraft damper on the exhaust port to minimize backdraft when TrueDRY

DR65 is not on but A/C is.

•Providing dry air to a specific area with an optional 20% open gravity damper on TrueDRY DR65 supply.

Main Return to Main Supply
B	AIR HANDLER
RETURN	SUPPLY

	BACKDRAFT
TrueDRY	DAMPER
	M27324

Ideal when…

•Running TrueDRY DR65 when not running A/C. Requires damper on the exhaust port to minimize backdraft when TrueDRY DR65 is not on but A/C is.

•Access to a dedicated central return for

TrueDRY DR65 is not available.

TrueDry DR65 Dehumidification System 69-2089EFS—12

5

Install to Fit Your Application (continued)

Main Return to Main Return

C	AIR HANDLER
RETURN	SUPPLY

TrueDRY		M27325

Dedicated Return to Main Return

D	TrueDRY
	SEPARATE
	RETURN

SUPPLY

M33152

Ideal when…

•Running TrueDRY DR65 with A/C operation.

•Minimizing discharge air temperature

(DAT) increase is preferred.

•Access to a dedicated central return for

TrueDRY DR65 is not available.

Note: Running TrueDRY DR65 after A/C shutoff may cause excess water on A/C evaporator coil to rehumidify air when not running A/C.

Ideal when…

•TrueDRY DR65 will not be ducted to a forced air HVAC system.

Plumbing

Attach 3/4-in. male NPT drain nozzle.

Connect 1/2-in. drain tube to male connection drain outlet. Secure drain tube to connector with hose clamp.

Run drain hose continuously downhill to an approved drain or condensate pump.

6	TrueDry DR65 Dehumidification System 69-2089EFS—12

Terminal Description

CAUTION: Low voltage hazard. Can cause equipment damage.

Disconnect HVAC equipment before beginning installation.

Two wiring terminal blocks are located on the exhaust end of the TrueDRY unit.

The six terminals for the left hand terminal block are:

FLOAT (2): External low-voltage water sensor or float switch

DHUM: Compressor and fan operation for dehumidification

R:DR65 24V output

FAN: Fan activation only for ventilation

* NOTE: The outer screws on each terminal block secure the block to the chassis. They are not used for wiring.

The right hand terminal block in the above figure is used only for interlocking a TrueDry DR65 with an equipment fan. The three terminals are:

Gt: Fan operation from thermostat Rf: 24V from equipment fan

Gf: Fan operation from equipment fan

C:DR65 24V output

External 24V devices can be powered from R and C terminals (20VA max.)

Wiring

Wire the TrueDRY			HVAC
DR65 according to
the diagram that
applies to your	R	C	W Y G
desired operation.
Follow this diagram for
ducted operation with the				+	+	+
onboard dehumidistat.	R	Rc	W Y G	FLOAT FLOAT DHUM R FAN	C	Gt Rf Gf

TrueDRY

+

THERMOSTAT	M33153

TrueDry DR65 Dehumidification System 69-2089EFS—12

7

Wiring (continued)

HVAC

R C W Y G

Follow this diagram if using the Prestige™ thermostat.

W
W2		C
Y		Rc
Y2		R
G		H
		H	TrueDRY
K		DH
	THERMOSTAT	DH

+	+ +	+
FLOAT DHUM R FAN C	Gt	Rf Gf
NOTE: THERMOSTAT MUST BE CONFIGURED TO DRIVE FURNACE FAN
DURING DEHUMIDIFICATION CALL.		M33154

		HVAC		MECHANICAL
				DEHUMIDISTAT
				DRY
				CONTACTS
R	C	W	Y	G

Follow this diagram if using an external manual dehumidistat.

			+	+	+
R Rc W	Y	G	FLOAT FLOAT DHUM R FAN C		Gt Rf Gf
				TrueDRY

THERMOSTAT

M33155

+

8	TrueDry DR65 Dehumidification System 69-2089EFS—12

Wiring (continued)

Follow this diagram for ducted operation with external ventilation control.

HVAC

R C W Y G

G	W8150A
R
C
C
W
G

R Rc W Y G

	EARD-6
R
C
DAMPER
AUX
REMOTE
+	+ +	+

FLOAT DHUM R FAN	C	Gt	Rf Gf
	TrueDRY

THERMOSTAT

M33156

Follow this diagram if using		TrueIAQ
TrueDRY DR65 with a powered		6840%
dehumidistat such as TrueIAQ			In
			7655%
(DG115EZIAQ).			Out
	2		1215:

	THERMOSTAT
	1
	R Rc C	W	Y	G	HVAC
R						R
C						C
SENSOR	OUTDOOR					W
SENSOR	SENSOR					Y
	(PROVIDED)
SWITCH						G
W
G
VENT					EARD-6
VENT
DEHUM
DEHUM
HUM				+	+	+
HUM	FLOAT DHUM R		FAN	C	Gt	Rf Gf
		TrueDRY

1IF A THERMOSTAT OTHER THAN A TH5110, TH5220, TH5320, TH6110, TH6220, TH6320, TH8110, TH8320, OR TH8321 IS USED, A RELAY MAY BE REQUIRED TO ISOLATE THE G WIRE.

2PROGRAM ISU SETTING 60 TO Ø TO FORCE SYSTEM FAN ON WITH DEHUMIDIFICATION CALL.

M33157

TrueDry DR65 Dehumidification System 69-2089EFS—12

9

Wiring (continued)

Follow this diagram if using TrueDRY DR65 with a VisionPro IAQ.

		EQUIPMENT INTERFACE MODULE (EIM)
D-1						FAN
R-2					FURNACE BOARD
C-3		1	CONV. HP		C	HEAT 1 RELAY
VISIONPRO IAQ		2	W1	O/B
		3	W2	AUX		HEAT 2 RELAY
		C	W3	AUX2		HEAT 3 RELAY
			Y	Y		COOL 1 RELAY
		RC	Y2	Y2		COOL 2 RELAY
					G
						FAN RELAY
		RH	G	G
		H1
		U
		M2
		D1	OR
		M2
		V1
		N
EARD-6		T2
+	+	+	+

FLOAT DHUM R FAN C Gt Rf Gf

TrueDRY

M33158

Checkout

Apply power to TrueDRY DR65. Turn the humidity control to a low RH% level to initiate a dehumidification call. Confirm that the TrueDRY DR65 compressor and fan turn on. The furnace blower will also turn on to circulate air. This will take up to two minutes. Be sure to turn the control to the desired RH% or to Off when checkout is complete. Turning the humidity control to Off will turn TrueDRY DR65 off.

10	TrueDry DR65 Dehumidification System 69-2089EFS—12

Cleaning

On an annual basis, maintenance is required to ensure TrueDRY runs at peak efficiency.

	Unplug TrueDRY DR65 before beginning	Remove duct collar to access filter.
1	service. Press down on the quick-	2
	release button and lift the duct collar.

	Remove filter (50049537-005) and		Check the drain connection and drain
3	replace with new filter.	4	line to ensure it is clear of debris and
			sludge. Ensure all hose connections

are secure once maintenance of the drain lines is complete.

When service is complete, initiate a 5 call for dehumidification and check

that the compressor and fan activate. If using the VisionPRO IAQ or TrueIAQ controls, reset maintenance reminders.

TrueDry DR65 Dehumidification System 69-2089EFS—12

11

Horizontal to Vertical Conversion

	1	Remove the six screws attached to	2	Remove the duct collar.
		the wiring side of the duct collar.

REMOVE THESE THREE SCREWS (THREE ON EACH SIDE)

Rotate the collar to the position

3 shown in the figure and place it back on the cabinet.

4	Reattach the duct collar using the
	six screws.

12	TrueDry DR65 Dehumidification System 69-2089EFS—12

Technical Description

TrueDRY DR65 uses a refrigeration system similar to an air conditioner to remove heat and moisture from incoming air and add heat to the air that is discharged. Hot, high-pressure refrigerant gas is routed from the compressor to the condenser coil. The refrigerant is cooled and condensed by giving up its heat to the

air that is about to be discharged from the unit. The refrigerant liquid then passes through a filter drier and capillary tubing which causes the refrigerant pressure and temperature to drop. It next enters the evaporator coil where it absorbs heat from the incoming air and evaporates. The evaporator operates in a flooded condition, which means that all the evaporator tubes contain liquid refrigerant during normal operation. A flooded evaporator should maintain nearly constant pressure and temperature across the entire coil, from inlet to outlet.

	STRAINER/FILTER	COMPRESSOR
	DRIER

CONDENSER

CAPILLARY

TUBES

EVAPORATOR

ACCUMULATOR

M27404

Troubleshooting

CAUTION: Servicing the TrueDRY DR65 with its high pressure refrigerant system and high voltage circuitry presents a health hazard which could result in death, serious bodily injury,

and/or property damage. Service should only be performed by a qualified service technician.

	Problem	Recommended Troubleshooting Steps
	No dehumidification. Neither	1.	Unit unplugged or no power to outlet.
	fan nor compressor run and the	2.	Humidity control set too high or defective.
	ventilation timer is OFF.	3.	Loose connection in internal or control wiring.
		4.	Defective Compressor relay.
		5.	Defective control transformer.
		6.	Optional Condensate Pump Safety Switch open.
	No dehumidification. Compressor	1.	Defective compressor run capacitor.
	does not run but fan runs when	2.	Bad connection in compressor circuit.
	there is a call for dehumidification	3.	Defective compressor overload.
	and the ventilation control is OFF.
		4.	Defective compressor.
		5.	Defrost thermostat open.
		6.	Optional Condensate Pump Safety Switch open.
	Fan runs when there is a call	1.	Low ambient temperature and/or humidity causing unit to cycle
	for dehumidification and the		through defrost mode.
	ventilation control is OFF, but the	2.	Defective compressor overload.
	compressor cycles on and off too
		3.	Defective compressor.
	frequently.
		4.	Defrost thermostat defective.
		5.	Dirty air filter(s) or airflow restricted.
		6.	Low refrigerant charge, causing defrost control to cycle.
		7.	Bad connection in compressor circuit. Fan does not run with
			fan switch in either position.

TrueDry DR65 Dehumidification System 69-2089EFS—12

13

Troubleshooting (continued)

	Problem	Recommended Troubleshooting Steps
	Fan does not run with	1.	Loose connection in fan circuit.
	ventilation activated.	2.	Obstruction prevents fan rotation.
	Compressor runs briefly	3.	Defective fan.
	but cycles on & off with
		4.	Defective fan relay.
	humidity control turned to
		5.	Defective fan capacitor.
	ON.
	Evaporator coil frosted	1.	Defrost thermostat loose or defective.
	continuously, low de-	2.	Low refrigerant charge.
	humidifying capacity.	3.	Dirty air filter(s) or airflow restricted.
	Unit not providing	1.	Check control wire connections (check connections at fresh air damper
	ventilation.		also).
		2.	Defective fresh air damper.
		3.	Dirty air intake. Clean outside intake hood.
	Unit removes some	1.	Air temperature and/or humidity have dropped.
	water, but not as much as	2.	Humidity meter and or thermometer used are out of calibration.
	expected.	3.	Unit has entered defrost cycle.
		4.	Dirty air filter.
		5.	Defective defrost thermostat.
		6.	Low refrigerant charge.
		7.	Air leak such as loose cover or ducting leaks.
		8.	Defective compressor.
		9.	Restrictive ducting.
		10. Optional Condensate Pump Safety Switch open.
	Unit Test to determine	1.	Detach field control wiring connections from main unit.
	problem:	2.	Connect the R and FAN contacts from the main unit together; only the
			impeller fan should run. Disconnect the wires.
		3.	Connect the R and DHUM contacts from the main unit together; the
			compressor and impeller fan should run.
		4.	If these tests work, the main unit is working properly. You should check
			the control panel and field control wiring for problems next.
		5.	Remove the control panel from the mounting box and detach it from the
			field installed control wiring. Connect the blue, yellow, and green wires
			from the control panel directly to the corresponding colored pigtails on
			the main unit. Leave the violet, white, and red wires disconnected!
		6.	Turn on the humidity control. The compressor and impeller fan should
			run.
		7.	If these tests work, the problem is most likely in the field control wiring.

Refrigerant Charging

If the refrigerant charge is lost due to service or a leak, a new charge must be accurately weighed in. If any of the old charge is left in the system, it must be recovered before weighing in the new charge. Refer to the unit nameplate for the correct charge weight and refrigerant type.

14	TrueDry DR65 Dehumidification System 69-2089EFS—12