Bard WH483, WH602, WH421 User Manual

INSTALLATION INSTRUCTIONS

WALL MOUNTED

PACKAGE HEAT PUMPS

MODELS:

WH421

WH483

WH602

	BARD MANUFACTURING COMPANY	Manual:	2100-399
	Bryan, Ohio 43506	Supersedes:
	Since 1914...Moving ahead, just as planned.	File:	Volume III Tab 17
		Date:	03-01-02

Copyright 2002

CONTENTS

Getting Other Information and Publications ..........	1
For more information, contact these publishers: ......	1
Wall Mount General Information .............................	2
Air Conditioner Wall Mount Model Nomenclature .....	2
Shipping Damage ....................................................	5
General ...............................................................	5
Duct Work ...............................................................	5
Filters ...............................................................	5
Fresh Air Intake ........................................................	6
Condensate Drain ....................................................	6
Installation Instructions ...........................................	7
Wall Mounting Information .......................................	7
Mounting the Unit .....................................................	7
Typical Installations ..................................................	7
Wiring – Main Power .............................................	11
Wiring – Low Voltage Wiring .................................	11
Thermostat Wiring .................................................	12
Heat Anticipation ....................................................	12
Thermostat Indicator Lamps ..................................	13
Emergency Heat Position ......................................	13
Compressor Malfunction ........................................	13

Figures
Figure 1	Unit Dimensions .....................................	3
Figure 2	Blower Damper Assembly ......................	6
Figure 3	Mounting Instructions ..............................	8
Figure 3A	Electric Heat Clearance .........................	8
Figure 4	Wall-Mounting Instructions .....................	9
Figure 5	Wall-Mounting Instructions .....................	9
Figure 6 Common Wall-Mounting Instructions ....		10
Figure 7	Unit 24V Terminal Board .......................	11
Figure 8	Compressor Cutoff and Outdoor
	Thermostat Wiring ................................	12
Figure 9	Start-Up Label ......................................	14
Figure 10	Defrost Control Board ..........................	16
Figure 11	Fan Blade Setting ................................	19

Start Up ...................................................................	14
Important Installer Note ..........................................	14
High Pressure Switch .............................................	14
Three Phase Scroll Compressor Start Up
Information .............................................................	14
Phase Monitor ........................................................	15
Service Hints ..........................................................	15
Sequence of Operation ..........................................	15
Pressure Service Ports ..........................................	15
Defrost Cycle .........................................................	15
Troubleshooting .....................................................	17
Solid State Heat Pump Control
Troubleshooting Procedure ....................................	17
Checking Temperature Sensor Outdoor
Unit Circuit .............................................................	18
Fan Blade Setting Dimensions ...............................	19
Removal of Fan Shroud .........................................	19
Refrigerant Charge ................................................	19
Pressure Chart ..................................................	20-21
Optional Accessories .............................................	21

Tables
Table	1	Electrical Specifications .........................	2
Table	2	Electric Heat Table .................................	4
Table	3	Thermostat Wire Size ..........................	12
Table	4	Wall Thermostat and
		Subbase Combinations ........................	13
Table	5	Troubleshooting ....................................	17
Table	6	Fan Blade Dimensions .........................	19
Table	7	Suction Line Temperatures...................	19
Table	8	Recommended Operating Ranges ......	19
Table	9	Indoor Blower Performance .................	19
Table	10	Maximum ESP of Operation ................	20
Table	11	Cooling Pressures ................................	20
Table	12	Heating Pressures ................................	21
Table	13	Optional Accessories ...........................	21

i

Getting Other Information and Publications

These publications can help you install the air conditioner or heat pump. You can usually find these at your local library or purchase them directly from the publisher. Be sure to consult current edition of each standard.

National Electrical Code .......................	ANSI/NFPA 70
Standard for the Installation ...............	ANSI/NFPA 90A
of Air Conditioning and
Ventilating Systems
Standard for Warm Air .......................	ANSI/NFPA 90B
Heating and Air
Conditioning Systems
Load Calculation for ........................	ACCA Manual J or
Residential Winter and	Manual N
Summer Air Conditioning
Low Pressure, Low Velocity ..........	ACCA Manual D or
Duct System Design for Winter	Manual Q
and Summer Air Conditioning

FOR MORE INFORMATION, CONTACT THESE PUBLISHERS:

ACCA Air Conditioning Contractors of America

1712 New Hampshire Ave. N.W.

Washington, DC 20009

Telephone: [phone]

Fax: [phone]

ANSI	American National Standards Institute
	11 West Street, 13th Floor
	New York, NY 10036
	Telephone: [phone]
	Fax: [phone]

ASHRAE American Society of Heating Refrigerating

and Air Conditioning Engineers, Inc.

1791 Tullie Circle, N.E.

Atlanta, GA 30329-2305

Telephone: [phone]

Fax: [phone]

NFPA	National Fire Protection Association
	Batterymarch Park
	P.O. Box 9101
	Quincy, MA 02269-9901
	Telephone: [phone]
	Fax: [phone]

Manufactured under the following U.S. patent numbers:

5,301,744; 5,002,116; 4,924,934; 4,875,520; 4,825,936; 4,432,409

Other patents pending.

Manual 2100-399

Page 1

WALL MOUNT GENERAL INFORMATION

HEAT PUMP WALL MOUNT MODEL NOMENCLATURE

MODEL NUMBER

WH

CAPACITY
42	– 3-1/2 Ton	REVISION
48	– 4 Ton
60	– 5 Ton

VOLTS & PHASE

A – 230/208/60-1

B – 230/208/60-3

C – 460/60-3 KW

00 – No KW

05 – 5 KW

06 – 6KW

09 – 9 KW

10 – 10 KW

15 – 15 KW

18 – 18 KW

20 – 20 KW

						CONTROL MODULES
48 1 – A 10 X X X X X B						(See Chart Below)
					COIL OPTIONS
					X – Standard
VENTILATION OPTIONS					1 – Phenolic Coated Evaporator
					2 – Phenolic Coated Condenser
X – Barometric Fresh Air Damper					3 – Phenolic Coated Evaporator
(Standard)				COLOR OPTIONS	and Condenser
B – Blank-off Plate
M – Motorized Fresh Air Damper				X – Beige (Standard)
V – Commercial Room Ventilator				1 – White
- Motorized with Exhaust				2 – Mesa Tan
E – Economizer (Internal) - Fully				3 – Colonial White		OUTLET OPTIONS
Modulating with Exhaust				4 – Buckeye Gray
						X – Front (Standard)
R – Energy Recovery Ventilator -
Motorized with Exhaust	FILTER OPTIONS

X– One Inch Throwaway (Standard)

W – One Inch Washable

P – Two Inch Pleated

NOTE: For 0KW and circuit breakers (230/208 V) or pull disconnects (460 V) applications, insert 0Z in the KW field of model number.

TABLE 1

ELECTRIC HEAT TABLE

Models		WH421-A				WH421-B			WH421-C			WH483-A				WH483-B			WH483-C
						WH483-B						WH602-A				WH602-B			WH602-C
	240-1		208-1		240-3		208-3		460-3		240-1		208-1		240-3		208-3		460-3
KW	A	BTU	A	BTU	A	BTU	A	BTU	A	BTU	A	BTU	A	BTU	A	BTU	A	BTU	A	BTU
4											16.7	13650	14.4	10240
5	20.8	17065	18.1	12800							20.8	17065	18.1	12800
6					14.4	20500	12.5	15360	7.2	20480
9					21.7	30600	18.7	23030	10.8	30700					21.7	30600	18.7	23030	10.8	30700
10	41.6	34130	36.2	25600							41.6	34130	36.2	25600
15	62.5	51200	54.1	38400	36.2	51200	31.2	38400	18.0	51200	62.5	51200	54.1	38400	36.2	51200	31.2	38400	18.0	51200
18															43.3	61400	37.5	46050
20											83.2	68250	72.1	51200

Manual 2100-399

Page 2

Page	Manual
3	399-2100

FIGURE 1

UNIT DIMENSIONS

MIS-411

TABLE 2

ELECTRICAL SPECIFICATIONS

SINGLE CIRCUIT

DUAL CIRCUIT

				4	1	2	2	4		1		2		2
					Maximum			Minimum		Maximum
			No.			Field				External		Field Power		Ground Wire
		Rated			External			Circuit		Fuse or
			Field	Minimum	Fuse or	Power	Ground	Ampacity		Ckt .Breaker		Wire Size		Size
		Volts	Power	Circuit	Circuit	Wire	Wire
	Model	& Phase	Ckts.	Ampacity	Breaker	Size	Size	Ckt A	Ckt B	Ckt A	Ckt B	Ckt A	Ckt B	Ckt A	Ckt B
	WH421-A00, A0Z		1	34	50	8	10	N/A	N/A	N/A	N/A	N/A	N/A	N/A	N/A
	A05	230/208-1	1 or 2	60	70	6	8	34	26	50	30	8	10	10	10
	3 A10		1 or 2	86	90	3	8	34	52	50	60	8	6	10	10
	A15		1 or 2	86	90	3	8	34	52	50	60	8	6	10	10
	WH421-B00, B0Z		1	26	35	8	10	N/A	N/A	N/A	N/A	N/A	N/A	N/A	N/A
	B06	230/208-3	1	44	50	8	10	N/A	N/A	N/A	N/A	N/A	N/A	N/A	N/A
	3 B09		1	53	60	6	10	N/A	N/A	N/A	N/A	N/A	N/A	N/A	N/A
	B15		1	53	60	6	10	N/A	N/A	N/A	N/A	N/A	N/A	N/A	N/A
	WH421-C00, C0Z		1	13	20	12	12	N/A	N/A	N/A	N/A	N/A	N/A	N/A	N/A
	C06	460-3	1	23	25	10	10	N/A	N/A	N/A	N/A	N/A	N/A	N/A	N/A
	3 C09		1	27	30	10	10	N/A	N/A	N/A	N/A	N/A	N/A	N/A	N/A
	C15		1	27	30	10	10	N/A	N/A	N/A	N/A	N/A	N/A	N/A	N/A
	WH483-A00, A0Z		1	36	50	8	10	N/A	N/A	N/A	N/A	N/A	N/A	N/A	N/A
	A04		1	57	60	6	8	N/A	N/A	N/A	N/A	N/A	N/A	N/A	N/A
	A05	230/208-1	1 or 2	62	70	6	8	36	26	50	30	8	10	10	10
	3 A10		1 or 1	88	100	3	8	36	52	50	60	8	6	10	10
	A15		1 or 2	88	100	3	8	36	52	50	60	8	6	10	10
	A20		1 or 2	110	110	2	6	59	52	60	60	6	6	10	10
	WH483-B00, B0Z		1	25	35	8	10	N/A	N/A	N/A	N/A	N/A	N/A	N/A	N/A
	B06		1	43	50	8	10	N/A	N/A	N/A	N/A	N/A	N/A	N/A	N/A
	3 B09	230/208-3	1	52	60	6	10	N/A	N/A	N/A	N/A	N/A	N/A	N/A	N/A
	B15		1	52	60	6	10	N/A	N/A	N/A	N/A	N/A	N/A	N/A	N/A
	B18		1	60	60	6	10	N/A	N/A	N/A	N/A	N/A	N/A	N/A	N/A
	WH483-C00, C0Z		1	13	15	14	14	N/A	N/A	N/A	N/A	N/A	N/A	N/A	N/A
	3 C09	460-3	1	26	30	10	10	N/A	N/A	N/A	N/A	N/A	N/A	N/A	N/A
	C15		1	27	30	8	10	N/A	N/A	N/A	N/A	N/A	N/A	N/A	N/A
	WH602-A00, A0Z		1	45	60	8	10	N/A	N/A	N/A	N/A	N/A	N/A	N/A	N/A
	A05		1 or 2	71	90	4	8	45	26	60	60	8	10	10	10
	3 A10	230/208-1	1 or 1	97	110	3	6	45	52	60	60	8	6	10	10
	A15		1 or 2	97	110	3	6	45	52	60	60	8	6	10	10
	A20		1 or 2	110	110	2	6	59	52	60	60	6	6	10	10
	WH602-B00, B0Z		1	33	45	8	10	N/A	N/A	N/A	N/A	N/A	N/A	N/A	N/A
	3 B09	230/208-3	1	60	60	6	10	N/A	N/A	N/A	N/A	N/A	N/A	N/A	N/A
	B15		1	60	60	6	10	N/A	N/A	N/A	N/A	N/A	N/A	N/A	N/A
	B18		1	60	60	6	10	N/A	N/A	N/A	N/A	N/A	N/A	N/A	N/A
	WH602-C00, C0Z		1	16	20	12	12	N/A	N/A	N/A	N/A	N/A	N/A	N/A	N/A
	3 C09	460-3	1	29	35	8	10	N/A	N/A	N/A	N/A	N/A	N/A	N/A	N/A
	C15		1	29	35	8	10	N/A	N/A	N/A	N/A	N/A	N/A	N/A	N/A

Q Maximum size of the time delay fuse or HACR type circuit breaker for protection of field wiring conductors.

R Based on 75°C copper wire. All wiring must conform to NEC and all local codes.

S Maximum KW that can operate with heat pump on.

TThese Minimum Circuit Ampacity" values are to be used for sizing the field power conductors. Refer to the National Electrical Code (latest version), article 310 for power conductor sizing. CAUTION: When more than one field power conductor circuit is run through one conduit, the conductors must be derated. Pay special attention to note 8 of table 310 regarding Ampacity Adjustment Factors when more than 3 conductors are in a raceway.

Manual 2100-399

Page 4

SHIPPING DAMAGE

Upon receipt of equipment, the carton should be checked for external signs of shipping damage. If damage is found, the receiving party must contact the last carrier immediately, preferably in writing, requesting inspection by the carrier’s agent.

GENERAL

The equipment covered in this manual is to be installed by trained, experienced service and installation technicians.

The refrigerant system is completely assembled and charged. All internal wiring is complete.

The unit is designed for use with or without duct work. Flanges are provided for attaching the supply and return ducts.

These instructions and any instructions packaged with any separate equipment required to make up the entire heat pump system should be carefully read before beginning the installation. Note particularly “Starting Procedure” and any tags and/or labels attached to the equipment.

While these instructions are intended as a general recommended guide, they do not supersede any national and/or local codes in any way. Authorities having jurisdiction should be consulted before the installation is made. See Page 1 for information on codes and standards.

Size of unit for a proposed installation should be based on heat loss calculation made according to methods of Air Conditioning Contractors of America (ACCA). The air duct should be installed in accordance with the Standards of the National Fire Protection Association for the Installation of Air Conditioning and Ventilating Systems of Other Than Residence Type, NFPA No. 90A, and Residence Type Warm Air Heating and Air Conditioning Systems, NFPA No. 90B. Where local regulations are at a variance with instructions, installer should adhere to local codes.

DUCT WORK

Any heat pump is more critical of proper operating charge and an adequate duct system than a straight air conditioning unit. All duct work, supply and return, must be properly sized for the design air flow requirement of the equipment. Air Conditioning Contractors of America (ACCA) is an excellent guide to proper sizing. All duct work or portions thereof not in the conditioned space should be properly insulated in order to both conserve energy and prevent condensation or moisture damage.

Refer to Table 10 for maximum static pressure available for duct design.

Design the duct work according to methods given by the Air Conditioning Contractors of America (ACCA). When duct runs through unheated spaces, it should be insulated with a minimum of one inch of insulation. Use insulation with a vapor barrier on the outside of the insulation. Flexible joints should be used to connect the duct work to the equipment in order to keep the noise transmission to a minimum.

A 1/4 inch clearance to combustible material for the first three feet (3') of duct attached to the outlet air frame is required. See Wall Mounting Instructions and Figures 4 and 4 for further details.

Ducts through the walls must be insulated and all joints taped or sealed to prevent air or moisture entering the wall cavity.

CAUTION

Some installations may not require any return air duct. A metallic return air grille is required with installations not requiring a return air duct. The spacing between louvers on the grille shall not be larger than 5/8 inches.

Any grille that meets the 5/8 inch louver criteria, may be used. It is recommended that Bard Return Air Grille Kit RG-2 thru RG-5 or RFG-2 thru RFG-5 be installed when no return duct is used. Contact distributor or factory for ordering information. If using a return air filter grille, filters must be of sufficient size to allow a maximum velocity of 400 fpm.

NOTE:If no return air duct is used, applicable installation codes may limit this cabinet to installation only in a single story structure.

FILTERS

A 1 inch throwaway filter is supplied with each unit. The filter slides into position making it easy to service. This filter can be serviced from the outside by removing the service door. A 1 inch washable filter and 2 inch pleated filter are also available as optional accessories. The internal filter brackets are adjustable to accommodate the 2 inch filter by bending down the tabs to allow spacing for the 2 inch filters.

Manual 2100-399

Page 5

FRESH AIR INTAKE

All units are built with fresh air inlet slots punched in the service panel.

If the unit is equipped with the fresh air damper assembly, the assembly is shipped already attached to the unit. The damper blade is locked in the closed position. To allow the damper to operate, the maximum and minium blade position stops must be installed. See Figure 2.

All capacity, efficiency and cost of operation information as required for Department of Energy “Energyguide” Fact Sheets is based upon the fresh air blank-off plate in place and is recommended for maximum energy efficiency.

The blank-off plate is available upon request from the factory and is installed in place of the fresh air damper shipped with each unit.

CONDENSATE DRAIN

A plastic drain hose extends from the drain pan at the top of the unit down to the unit base. There are openings in the unit base for the drain hose to pass through. In the event the drain hose is connected to a drain system of some type, it must be an open or vented type system to assure proper drainage.

FIGURE 2

BLOWER DAMPER ASSEMBLY

BLADE IS LOCKED

CLOSED FOR

SHIPPING

MIS-938

Manual 2100-399

Page 6

INSTALLATION INSTRUCTIONS

WALL MOUNTING INFORMATION

1.Two holes, for the supply and return air openings, must be cut through the wall as shown in Figure 3.

2.On wood-frame walls, the wall construction must be strong and rigid enough to carry the weight of the unit without transmitting any unit vibration. See Figures 4 and 5.

WARNING

Fire hazard can result if 1/4 inch clearance to combustible materials for supply air duct is not maintained. See Figure 3.

3.Concrete block walls must be thoroughly inspected to insure that they are capable of carrying the weight of the installing unit. See Figure 4.

MOUNTING THE UNIT

1.These units are secured by wall mounting brackets which secure the unit to the outside wall surface at both sides. A bottom mounting bracket is provided for ease of installation, but it is not required.

2.The unit itself is suitable for “0” inch clearance, but the supply air duct flange and the first 3 feet of supply air duct require a minimum of 1/4 inch clearance to combustible material. If a combustible wall, use a minimum of 30-1/2" x 10-1/2" dimensions for sizing. However, it is generally recommended that a 1 inch clearance is used for ease of installation and maintaining the required clearance to combustible material. The supply air opening would then be 32" x 12". See

Figures 3, 4 and 7 for details.

WARNING

Failure to provide the 1/4 inch clearance between the supply duct and a combustible surface for the first 3 feet of duct can result in fire.

3.Locate and mark lag bolt locations and bottom mounting bracket location. See Figure 4.

4.Mount bottom mounting bracket.

5.Hook top rain flashing under back bend of top. Top rain flashing is shipped secured to the right side of the back.

6.Position unit in opening and secure with 5/16 lag bolts; use 7/8 inch diameter flat washers on the lag bolts.

7.Secure rain flashing to wall and caulk across entire length of top. See Figure 3.

8.For additional mounting rigidity, the return air and supply air frames or collars can be drilled and screwed or welded to the structural wall itself (depending upon wall construction). Be sure to observe required clearance if combustible wall.

9.On side by side installations, maintain a minimum of 20 inches clearance on right side to allow access to heat strips and control panel, and to allow proper airflow to the outdoor coil. Additional clearance may be required to meet local or national codes.

TYPICAL INSTALLATIONS

See Figure 6 for common ways to install the wall-mount unit.

Manual 2100-399

Page 7

FIGURE 3

MOUNTING INSTRUCTIONS

NOTE: It is recommended that a bead of silicone caulking be placed behind the side mounting flanges and under the top flashing at the time of installation.

MIS-796

FIGURE 3A

ELECTRIC HEAT CLEARANCE

Side section view of supply air duct for wall mounted unit showing 1/4 inch clearance to combustible surfaces.

WARNING

•A minimum of 1/4 inch clearance must be maintained between the supply air duct and combustible materials. This is required for the first 3 feet of ducting.

•It is important to insure that the 1/4 inch minimum spacing is maintained at all points.

•Failure to do this could result in overheating the combustible material and may result in fire.

MIS-277

Manual 2100-399

Page 8

FIGURE 4

WALL-MOUNTING INSTRUCTIONS

SEE FIGURE 3 — MOUNTING INSTRUCTIONS

MIS-548

FIGURE 5

WALL-MOUNTING INSTRUCTIONS

SEE UNIT DIMENSIONS, FIGURE 1,

FOR ACTUAL DIMENSIONS

SEE FIGURE 1 FOR

DUCT DIMENSIONS

MIS-549

Manual 2100-399

Page 9

FIGURE 6

COMMON WALL-MOUNTING INSTALLATIONS

	MIS-550
Manual	2100-399
Page	10

WIRING — MAIN POWER

Refer to the unit rating plate for wire sizing information and maximum fuse or “HACR" type circuit breaker size. Each outdoor unit is marked with a “Minimum Circuit Ampacity”. This means that the field wiring used must be sized to carry that amount of current. Depending on the installed KW of electric heat, there may be two field power circuits required. If this is the case, the unit serial plate will so indicate. All models are suitable only for connection with copper wire. Each unit and/or wiring diagram will be marked “Use Copper Conductors Only”. These instructions must be adhered to. Refer to the National Electrical Code (NEC) for complete current carrying capacity data on the various insulation grades of wiring material. All wiring must conform to NEC and all local codes.

The electrical data lists fuse and wire sizes (75ºC copper) for all models, including the most commonly used heater sizes. Also shown are the number of field power circuits required for the various models with heaters.

The unit rating plate lists a “Maximum Time Delay Relay Fuse” or “HACR" type circuit breaker that is to be used with the equipment. The correct size must be used for proper circuit protection and also to assure that there will be no nuisance tripping due to the momentary high starting current of the compressor motor.

The disconnect access door on this unit may be locked to prevent unauthorized access to the disconnect. To convert for the locking capability, bend the tab located in the bottom left hand corner of the disconnect opening under the disconnect access panel straight out. This tab will now line up with the slot in the door. When shut, a padlock may be placed through the hole in the tab preventing entry.

See Start-up section for information on three phase scroll compressor start-ups.

NOTE:The voltage should be measured at the field power connection point in the unit and while the unit is operating at full load (maximum amperage operating condition).

Nine (9) wires should be run from thermostat subbase to the 24V terminal board in the unit. A nine conductor, 18 gauge copper, color-coded thermostat cable is recommended. The connection points are shown in Figure 7.

FIGURE 7

UNIT 24V TERMINAL BOARD

See Note 1

MIS-440

FACTORY JUMPER

IMPORTANT NOTE:

Only the thermostat and subbase combinations as shown at the right will work with this equipment. The thermostat and subbase must be matched and the correct operation can be assured only by proper selection and application of these parts.

WIRING — LOW VOLTAGE WIRING

230/208V, 1 phase and 3 phase equipment dual primary voltage transformers. All equipment leaves the factory wired on 240V tap. For 208V operation, reconnect from 240V to 208V tap. The acceptable operating voltage range for the 240 and 208V taps are:

Tap		Range
240	253 - 216
208	220 - 187

Note 1: 1F93-380 thermostat must be set to "Heat Pump" mode to operate properly.

Press the program"RUN" button to make sure the thermostat is in run program model.

Press time "FWD" and "BACK" at the same time to enter User Configuration Menu.

Press and hold set "TIME" and "DAY" for about 3 seconds to enter Installer Menu.

The thermostat will display "MULTI STG"

Press the "UP" or "DOWN" button until the display reads "HEAT PUMP"

Press program "RUN" button to resume operation.

Manual 2100-399

Page 11

TABLE 3

THERMOSTAT WIRE SIZE

			Maximum
Transformer			Distance
VA	FLA	Wire Gauge	In Feet
		20 gauge	45
		18 gauge	60
55	2.3	16 gauge	100
		14 gauge	160
		12 gauge	250

THERMOSTAT WIRING

COMPRESSOR CUTOFF THERMOSTAT AND OUTDOOR THERMOSTATS

Heat pump compressor operation at outdoor temperatures below 0° F are neither desirable nor advantageous in terms of efficiency. Since most equipment at time of manufacture is not designated for any specific destination of the country and most of the equipment is installed in areas not approaching the lower outdoor temperature range, the compressor cutoffs are not factory installed.

Outdoor thermostats are available to hold off various banks of electric heat until needed as determined by outdoor temperature. The set point of either type of thermostat is variable with geographic region and sizing of the heating equipment to the structure Utilization of the Heating Application Data and the heat loss calculation of the building are useful in determining the correct set points.

HEAT ANTICIPATION

Both of the thermostats in Groups A and B below have a fixed heat anticipator for stage 1 with no adjustment required. Stage 2 has an adjustable anticipator for the W2 connection and fixed for the W3 connection. Both the W2 and W3 circuits are controlled by the stage 2 bulb. The only heat anticipator that needs to be checked is stage 2 and it should be set to match the load carried by the W2 circuit. The normal factory wiring provides for only on electric heat contactor to be controlled by W2, and the anticipator should be set at

.40A. If special field wiring is done, it is best to actually measure the load but a good role is .40A for each heat contactor controlled by W2.

FIGURE 8

COMPRESSOR CUTOFF AND OUTDOOR THERMOSTAT WIRING

4 - 10KW 1PH --- 6 & 9KW 3-PH

15 - 20KW 1-PH & 3-PH

MIS-409

Manual 2100-399

Page 12

TABLE 4

WALL THERMOSTAT AND SUBBASE COMBINATIONS

	Thermostat	Subbase	Predominant Features
	8403-045	- - -	1 stg. cool; 2 stg. heat; Mercury bulb
	(T841A1761)		Manual changeover
	8403-017	8404-009	2 stg. cool; 2 stg. heat; Mercury bulb
	(T874R1129)	(Q674L1181)	Manual changeover
	8403-018	8404-010	2 stg. cool; 2 stg. heat; Mercury bulb
	(T874N1024)	(Q674F1261)	Auto or Manual changeover
	8403-042		1 stg. cool; 2 stg. heat
		- - -	Electronic Non-Programmable
	(T8511G1070)
			Auto or Manual changeover
	8403-049		2 stg. cool; 2 stg. heat
		- - -	Programmable Electronic
	(1F93-380)
			Auto or Manual changeover

(1)No automatic changeover position -- must be manually placed in heat or cool. Reversing valve remains energized at all times system switch is in heat position (except during defrost cycle). No pressure equalization noise when thermostat is satisfied on either heating or cooling.

(2)Allows thermostat to control both heating and cooling operation when set in "Auto" position. Reversing valve de-energizes at end of each "On" heating cycle.

IMPORTANT NOTE:

Both thermostat and subbase combinations shown above in Groups A and B incorporate the following features: Man-Auto fan switch, Off-Heat-Cool-Em. Heat switch, and two (2) indicator lamps – one for emergency heat and one for compressor malfunction.

THERMOSTAT INDICATOR LAMPS

The red lamp marked "Em. Ht." comes on and stays on whenever the system switch is placed in the emergency heat position. The green lamp marked "Check" will come on if there is any problem that prevents the compressor from running when it is supposed to be.

EMERGENCY HEAT POSITION

The operator of the equipment must manually place the system switch in this position. This is done when there is a know problem with the unit, or when the green "Check" lamp comes on indicating a problem.

COMPRESSOR MALFUNCTION LIGHT

Actuation of the green "Check" lamp is accomplished by a relay output from the heat pump control board which is factory installed. Any condition such as loss of charge, high head pressure, etc., that will prevent compressor for operating will cause green lamp to activate. This is a signal to the operator of the equipment to place system in emergency heat position.

Manual 2100-399

Page 13

START UP

IMPORTANT INSTALLER NOTE

For improved start-up performance, wash the indoor coil with a dishwashing detergent.

CRANKCASE HEATERS

WA421 units are provided with compressor crankcase heat. WH602 and WH483 units are not provided with crankcase heat. These units utilize scroll compressors which do not require crankcase heat in this application.

The WH421 models have an insertion well-type heater located in the lower section of the compressor housing this is a self-regulating type heater that draws only enough power to maintain the compressor at a safe temperature on these units.

Some form of crankcase heat is essential to prevent liquid refrigerant from migrating to the compressor, causing oil pump out on compressor start-up and possible valve failure due to compressing a liquid.

The decal in Figure 9 is affixed to all WA421 units detailing start-up procedure. This is very important.

Please read carefully.

HIGH PRESSURE SWITCH

The WH483 and WH602 models are supplied with a remote reset high pressure switch. If tripped, this pressure switch may be reset by turning the thermostat off then back on again.

THREE PHASE SCROLL COMPRESSOR START UP INFORMATION

Scroll compressors, like several other types of compressors, will only compress in one rotational direction. Direction of rotation is not an issue with single phase compressors since they will always start and run in the proper direction.

However, three phase compressors will rotate in either direction depending upon phasing of the power. Since there is a 50-50 chance of connecting power in such a way as to cause rotation in the reverse direction, verification of proper rotation must be made. All three phase units incorporate a phase monitor to ensure proper field wiring. See the Phase Monitor" on page 15 of this manual.

Verification of proper rotation must be made any time a compressor is change or rewired. If improper rotation is corrected at this time there will be no negative impact on the durability of the compressor. However, reverse operation for over one hour may have a negative impact on the bearing due to oil pump out.

FIGURE 9

START UP LABEL

IMPORTANT

THESE PROCEDURES MUST BE FOLLOWED AT INITIAL START UP AND AT ANY TIME POWER HAS BEEN REMOVED FOR 12 HOURS OR LONGER.

TO PREVENT COMPRESSOR DAMAGE WHICH MAY RESULT FROM THE PRESENCE OF LIQUID REFRIGERANT IN THE COMPRESSOR CRANKCASE:

1.MAKE CERTAIN THE ROOM THERMOSTAT IS IN THE “OFF“POSITION. (THE COMPRESSOR IS NOT TO OPERATE.)

2.APPLY POWER BY CLOSING THE SYSTEM DISCONNECT SWITCH. THIS ENERGIZES THE COMPRESSOR HEATER WHICH EVAPORATES THE LIQUID REFRIGERANT IN THE CRANKCASE.

3.ALLOW 4 HOURS OR 60 MINUTES PER POUND OF REFRIGERANT IN THE SYSTEM AS NOTED ON THE UNIT RATING PLATE, WHICHEVER IS GREATER.

4.AFTER PROPER ELAPSED TIME THE THERMOSTAT MAY BE SET TO OPERATE THE COMPRESSOR.

5.EXCEPT AS REQUIRED FOR SAFETY WHILE SERVICING, DO NOT OPEN SYSTEM DISCONNECT SWITCH.

7961-411

NOTE:If compressor is allowed to run in reverse rotation for several minutes, the compressor's internal protector will trip.

All three phase ZR3 compressors are wired identical internally. As a result, once the correct phasing is determined for a specific system or installation, connecting properly phased power leads to the same Fusite terminal should maintain proper rotation direction.

Verification of proper rotation direction is made by observing that suction pressure drops and discharge pressure rises when the compressor is energized.

Reverse rotation also results in an elevated sound level over that with correct rotations, as well as, substantially reduced current draw compared to tabulated values.

The direction of rotation of the compressor may be changed by reversing any two line connections to the unit.

Manual 2100-399

Page 14

PHASE MONITOR

All units with three phase compressors are equipped with a 3 phase line monitor to prevent compressor damage due to phase reversal.

The phase monitor in this unit is equipped with two LEDs. If the Y signal is present at the phase monitor and phases are correct, the green LED will light. If phases are reversed, the red fault LED will be lit and compressor operation is inhibited.

If a fault condition occurs, reverse two of the supply leads to the unit. Do not reverse any of the unit factory wires as damage may occur.

SERVICE HINTS

1.Caution homeowner to maintain clean air filters at all times. Also, not to needlessly close off supply and return air registers. This reduces air flow through the system, which shortens equipment service life as well as increasing operating costs.

2.Switching to heating cycle at 75° F or higher outside temperature may cause a nuisance trip of the remote reset high pressure switch. Turn thermostat off, then on to reset the high pressure switch.

3.The heat pump wall thermostats perform multiple functions. Be sure that all function switches are correctly set for the desired operating mode before trying to diagnose any reported service problems.

4.Check all power fuses or circuit breakers to be sure they are the correct rating.

5.Periodic cleaning of the outdoor coil to permit full and unrestricted airflow circulation is essential.

SEQUENCE OF OPERATION

COOLING – Circuit R-Y makes at thermostat pulling in compressor contactor, starting the compressor and outdoor motor. The G (indoor motor) circuit is automatically completed on any call for cooling operation or can be energized by manual fan switch on subbase for constant air circulation.

HEATING – A 24V solenoid coil on reversing valve controls heating cycle operation. Two thermostat options, one allowing "Auto" changeover from cycle to cycle and the other constantly energizing solenoid coil during heating season, and thus eliminating pressure equalization noise except during defrost, are to be used. On "Auto" option a circuit is completed from R-W1 and R-Y on each heating "on" cycle, energizing reversing valve solenoid and pulling in compressor contactor starting compressor and outdoor motor. R-G also make starting indoor blower motor. Heat pump heating cycle

now in operation. The second option has no "Auto" changeover position, but instead energizes the reversing valve solenoid constantly whenever the system switch on subbase is placed in "Heat" position, the "B" terminal being constantly energized from R. A Thermostat demand for heat completes r-Y circuit, pulling in compressor contactor starting compressor and outdoor motor. R-G also make starting indoor blower motor.

PRESSURE SERVICE PORTS

High and low pressure service ports are installed on all units so that the system operating pressures can be observed. Pressure tables can be found later in the manual covering all models on both cooling and heating cycles. It is imperative to match the correct pressure curve to the unit by model number.

DEFROST CYCLE

The defrost cycle is controlled by temperature and time on the solid state heat pump control.

When the outdoor temperature is in the lower 40° F temperature range or colder, the outdoor coil temperature is 32° F or below. This coil temperature is sensed by the coil sensor mounted near the bottom of the outdoor coil. Once coil temperature reaches 30° F or below, the coil sends a signal to the control logic of the heat pump control and the defrost timer will start.

After 60 (90 or 30) minutes at 30° F or below, the heat pump control will place the system in the defrost mode.

During the defrost mode, the refrigerant cycle switches back to the cooling cycle, the outdoor motor stops, electric heaters are energized, and hot gas passing through the outdoor coil melts any accumulated frost. When the temperature rises to approximately 57° F, the coil sensor will send a signal to the heat pump control which will return the system to heating operations automatically.

If some abnormal or temporary conditions such as a high wind caused the heat pump to have a prolonged defrost cycle, the heat pump control will restore the system to heating operating automatically after 10 minutes.

There is a cycle SPEEDUP jumper on the control. This can be used to reduce the time between defrost cycle operation without waiting for time to elapse.

Use a small screwdriver or other metallic object, or another 1/4 inch QC to short between the SPEEDUP terminals to accelerate the HPC timer and initiate defrost. Be careful not to touch any other terminals with the instrument used to short the SPEEDUP terminals. It may take up to 10 seconds with the SPEEDUP terminals shorted for the speedup to be completed and the defrost cycle to start.

Manual 2100-399

Page 15

As soon as the defrost cycle kicks in, remove the shorting instrument from the SPEEDUP terminals. Otherwise the timing will remain accelerated and run through the 10-minute maximum defrost length sequence in a matter of seconds and will automatically terminate the defrost sequence.

There is an initial defrost (SEN JMP) jumper on the control that can be used at any outdoor ambient during the heating cycle to simulate a 0° coil temperature. This can be used to check defrost operation of the unit without waiting for the outdoor ambient to fall into the defrost region.

The jumper connection (SEN JMP) on the heat Pump Control (HPC) that can be used during the heating cycle to simulate a 0 degree coil condition and initiate the defrost sequence. By placing a jumper across the

SEN JMP terminals (1/4 inch QC terminal works best) the defrost sensor mounted on the outdoor coil is shunted out and will activate the timing circuit. This permits the defrost cycle to be checked out in warmer weather conditions without the outdoor temperature having to fall into the defrost region.

There are three time settings on the HPC — 30, 60 or on minutes. These are elapsed run-time values, and the outdoor coil temperature sensor must be below the 30 degree equivalent resistance value for the timer to accumulate time towards the actual defrost cycle event. Using the SEN JMP terminals will force the timer to run continuously.

The next event is the actual defrost cycle when the reversing valve shifts the refrigerant system back to the cooling mode, and the outdoor fan motor is turned off to speed the heating of the outdoor coil and melting of any accumulated frost. The SPEEDUP terminals can be used to reduce the 30,60 or 90 minute real-time periods to a matter of seconds. Electric heat is typically turned on to temper the supply air temperature being delivered into the building during the defrost cycle.

There is also a 5-minute compressor time delay function built into the HPC. This is to protect the compressor from short cycling conditions. In some instances it is helpful to the service technician to override or speedup this timing period, and shorting out the SPEEDUP terminals for a few seconds can do this.

FIGURE 10

DEFROST CONTROL BOARD

Manual 2100-399

Page 16

TROUBLESHOOTING

SOLID STATE HEAT PUMP CONTROL TROUBLESHOOTING PROCEDURE

1.Turn on AC power supply to indoor and outdoor units.

2.Turn thermostat blower switch to fan "on" – the indoor blower should start. (If it doesn't, troubleshoot indoor unit and correct problem).

3.Turn thermostat blower switch to auto position. Indoor blower should stop.

4.Set system to heat or cool. Adjust thermostat to call for heat or cool – the indoor blower, compressor, and outdoor fan should start.

NOTE:If there was no power to 24 volt transformer, the compressor and outdoor fan motor will not start for 5 minutes. This is because of the compressor short cycle protection.

TABLE 5

TROUBLESHOOTING

	Symptom	Possible Causes		What to Check		How to Check or Repair
	Compressor	Control circuit wiring	Check for R connectio at unit		Run R connection to outdoor unit to power heat
	contactor does not		and 24 volt between R - C		pump control.
	energize (heating or
		Compressor lock out	1.	Check for 24V between	1.	If no voltage between L1-C, turn thermostat
	cooling)			L1-C on heat pump		off and on again to reset high pressure
			2.	control		switch.
				Check across high presure	2.	If high pressure switch is open and will not
				switch.		reset, replace high pressure switch.
		Compressor short cycle	Check for 24 V between CC-C		If not voltage between CC-C, jumper speed
		protection	and Y-C on heat pump control.		up terminal, and within 10 seconds power
					should appear between CC-C. Remove
					speed up jumper after 10 seconds.
		Heat pump control	Check all other possible		Replace heat pump control.
		defective	causes. Manual 2100-065
		Contactor defective	Check for open or shorted coil		Replace contactor.
			winding.
		Power phasing not	Check for red LED on phase		Switch two power leds to the unit.
		correct	monitor (3 phase units only).
	Fan outdoor motor	Motor defective	Check for open or shorted		Replace motor.
	does not run		motor winding.
	(cooling or heating
		Motor capacitor	Check capacitor ratng. Check		Replace capacitor.
	except during
		defective	for open or shorted capacitor.
	defrost)
		Heat pump control	Check across fan relay on		Replace heat pump control.
		defective	heat pump control (Com-NC).
	Reversing valve	Reversing valve solenoid	Check for open or shorted coil.		Replace solenoid Coil.
	does not energize	coil defective
	(heating only)
		Heat pump control	Check for 24V between RV-C		1.	Check control circuit wiring.
		defective	and B-C.		2. Replace heat pump control.
	Unit will not go into	Temperature sensor or	Disconnect temperature		1.	If unit goes through defrost cycle, replace
	defrost	heat pump control	sensor from board and jumper			temperature sensor.
	(heating only)	defective	across speed up terminals and		2.	If unit does not go through defrost cycle,
			sen jump terminals. This
			should caruse the unit to go			replace heat pump control.
			through a defrost cycle within
			one minute.
	Unit will not come	Temperature sensor or	Jumper across speed up		1.	If unit comes out of defrost cycle replace
	out of defrost	heat pump control	terminals. This should cause			temperature sensor.
	(heating only)	defective	the unit to come out of defrost		2.	If unit does not come out of defrost
			within one minute.			cycle, replace heat pump control.

Manual 2100-399

Page 17

CHECKING TEMPERATURE SENSOR OUTSIDE UNIT CIRCUIT

1.Disconnect temperature sensor from board and from outdoor coil.

2.Use an ohmmeter and measure the resistance of the sensor. Also use ohmmeter to check for short or open.

3.Check resistance reading to chart of resistance. Use sensor ambient temperature. (Tolerance of part is

± 10%.)

4.If sensor resistance reads very low, then sensor is shorted and will not allow proper operation of the heat pump control.

5.If sensor is out of tolerance, shorted, open or reads very low ohms then it should be replaced.

TEMPERATURE F VS. RESISTANCE R OF TEMPERATURE SENSOR

F	R	F	R	F	R	F	R
-25.0	196871	13.0	56985	53.0	19374	89.0	7507
-24.0	190099	14.0	55284	52.0	18867	90.0	7334
-23.0	183585	15.0	53640	53.0	18375	91.0	7165
-22.0	177318	16.0	52051	54.0	17989	92.0	7000
-21.0	171289	17.0	50514	55.0	17434	93.0	6840
-20.0	165487	18.0	49028	56.0	16984	94.0	6683
-19.0	159904	19.0	47590	57.0	16547	95.0	6531
-18.0	154529	20.0	46200	58.0	16122	96.0	6383
-17.0	149355	21.0	44855	59.0	15710	97.0	6239
-16.0	144374	22.0	43554	60.0	15310	98.0	6098
-15.0	139576	23.0	42295	61.0	14921	99.0	5961
-14.0	134956	24.0	41077	62.0	14544	100.0	5827
-13.0	130506	25.0	39898	63.0	14177	101.0	5697
-12.0	126219	26.0	38757	64.0	13820	102.0	5570
-11.0	122089	27.0	37652	65.0	13474	103.0	5446
-10.0	118108	28.0	36583	66.0	13137	104.0	5326
-9.0	114272	29.0	35548	67.0	12810	105.0	5208
-8.0	110575	30.0	34545	68.0	12492	106.0	5094
-7.0	107010	31.0	33574	69.0	12183	107.0	4982
-6.0	103574	32.0	32634	70.0	11883	108.0	4873
-5.0	100260	33.0	31723	71.0	11591	109.0	4767
-4.0	97064	34.0	30840	72.0	11307	110.0	4663
-3.0	93981	35.0	29986	73.0	11031	111.0	4562
-2.0	91008	36.0	29157	74.0	10762	112.0	4464
-1.0	88139	37.0	28355	75.0	10501	113.0	4367
0.0	85371	38.0	27577	76.0	10247	114.0	4274
1.0	82699	39.0	26823	77.0	10000	115.0	4182
2.0	80121	40.0	26092	78.0	9760	116.0	4093
3.0	77632	41.0	25383	79.0	9526	117.0	4006
4.0	75230	42.0	24696	80.0	9299	118.0	3921
5.0	72910	43.0	24030	81.0	9077	119.0	3838
6.0	70670	44.0	23384	82.0	8862	120.0	3757
7.0	68507	45.0	22758	83.0	8653	121.0	3678
8.0	66418	46.0	22150	84.0	8449	122.0	3601
9.0	64399	47.0	21561	85.0	8250	123.0	3526
10.0	62449	48.0	20989	86.0	8057	124.0	3452
11.0	60565	49.0	20435	87.0	7869
12.0	58745	50.0	19896	88.0	7686

Manual 2100-399

Page 18

FAN BLADE SETTING DIMENSIONS

Shown in the drawing in Figure 11 are the correct fan blade setting dimensions for proper air delivery across the outdoor coil.

Any service work requiring removal or adjustment in the fan and/or motor area will require that the dimensions below be checked and blade adjusted in or out on the motor shaft accordingly.

FIGURE 11

FAN BLADE SETTING

TABLE 6

FAN BLADE DIMENSIONS

Model

Dimension A

WH421

WH483 1.75

WH602

MIS-1190

REMOVAL OF FAN SHROUD

1.Disconnect all power to unit.

2.Remove the screws holding both grilles – one on each side of unit – and remove grilles.

3.Remove screws holding fan shroud to condenser and bottom – (9) screws.

4.Unwire condenser fan motor.

5.Slide complete motor, fan blade, and shroud assembly out the left side of the unit.

6.Service motor/fan as needed.

7.Reverse steps to reinstall.

REFRIGERANT CHARGE

The correct system R-22 charge is shown on the unit rating plate. Optimum unit performance will occur with a refrigerant charge resulting in a suction line temperature (6 inches from compressor) as shown in the Table 7.

TABLE 7

SUCTION LINE TEMPERATURES

	Rated	95°F O.D.	82°F O.D.
Model	Airflow	Temperature	Temperature
WH421	1400	52 -- 54	62 -- 64
WH483	1550	53 -- 55	62 -- 64
WH602	1700	52 -- 54	61 -- 63

The suction line temperatures in Table 7 are based upon 80ºF dry bulb/67 degrees F wet bulb (50 percent R.H.) temperature and rated airflow across the evaporator during cooling cycle.

TABLE 8

RECOMMENDED OPERATING RANGES

	Rated	Rated	Recommended
Model	CFM *	ESP *	Air Flow Range
WH421	1400	.30	1600 -- 1150
WH483	1550	.20	1750 -- 1285
WH602	1700	.30	1950 -- 1375

* Rated CFM and ESP on high speed tap.

TABLE 9

INDOOR BLOWER PERFORMANCE

CFM @ 230V

		WH421, WH483				WH602
E.S.P.	Low 230V		High 230V		Low 230V		High 230V
In H2O	Dry Coil	Wet Coil	Dry Coil	Wet Coil	Dry Coil	Wet Coil	Dry Coil	Wet Coil
.0	1650	1600	1885	1800	1600	1450	2200	2000
.1	1550	1500	1770	1665	1525	1375	2100	1900
.2	1450	1400	1635	1540			2000	1800
.3	1350	1300	1500	1400			1875	1700
.4	1300	1175	1370	1285			1775	1600
.5	-----	-----	1250	1150			1650	1475

Manual 2100-399

Page 19

TABLE 10

MAXIMUM ESP OF OPERATION

ELECTRIC HEAT ONLY

Model	WH421		WH483		WH602
Speed KW	High Speed	Low Speed	High Speed	Low Speed	High Speed	Low Speed
-A00	.50	.50	.50	.50	.50	.40
-A04	-----	-----	.50	.50	-----	-----
-A05	.50	.50	.50	.50	.50	.25
-A10	.50	.45	.50	.45	.50	.25
-A15	.50	.45	.50	.45	.50	.25
-A20	-----	-----	.50	.45	.50	.25
-B00	.50	.50	.50	.50	.50	.40
-B09	.50	.45	.50	.45	.50	.30
-B15	.50	.45	.50	.45	.50	.30
-B18	-----	-----	.50	.45	.50	.30
-C00	.50	.50	.50	.50	.50	.40
-C09	.50	.40	.50	.40	.50	.35
-C15	.50	.40	.50	.40	.50	.35

Values shown are for unites equipped with STD 1 inch throwaway filter on 1 inch washable filter. Derate ESP by .15 for 2 inch pleated filters.

TABLE 11

COOLING PRESSURE – (ALL TEMPERATURES °F)

		Return Air
	Model	Temperature	Pressure	75	80	85	90	95	100	105	110	115
		75 deg. DB	Low Side	74	75	77	78	79	80	80	81	82
		62 deg. WB	High Side	205	220	235	251	266	282	297	313	329
	WH421	80 deg. DB	Low Side	79	80	82	83	84	85	85	86	86
		67 deg. WB	High Side	210	226	241	257	273	289	305	321	337
		85 deg. DB	Low Side	85	86	88	89	90	91	91	92	92
		72 deg. WB	High Side	217	233	250	266	283	300	316	333	349
		75 deg. DB	Low Side	72	73	74	76	77	78	79	80	81
		62 deg. WB	High Side	215	229	245	261	278	295	313	332	351
	WH483	80 deg. DB	Low Side	77	78	79	81	82	83	84	86	87
		67 deg. WB	High Side	220	235	251	268	285	303	321	340	360
		85 deg. DB	Low Side	80	81	82	84	85	86	87	89	90
		72 deg. WB	High Side	228	243	260	277	295	314	332	352	373
		75 deg. DB	Low Side	70	71	73	74	75	76	78	79	81
		62 deg. WB	High Side	225	233	246	262	282	306	333	364	399
	WH602	80 deg. DB	Low Side	75	76	78	79	80	81	83	85	87
		67 deg. WB	High Side	213	239	252	269	289	313	341	373	409
		85 deg. DB	Low Side	81	82	84	85	86	88	90	93	95
		72 deg. WB	High Side	240	248	261	278	299	324	353	386	410

Low side pressure ± 2 psig

High side pressure ± 5 psig

Tables are based upon rated CFM (airflow) across the evaporator coil. If there is any doubt as to correct operating charge being in the system, the charge should be removed, system evacuated and recharged to serial plate instruction.

Manual 2100-399

Page 20

TABLE 12

HEATING PRESSURES – (ALL TEMPERATURES °F)

		Return Air
	Model	Temperature	Pressure	0	5	10	15	20	25	30	35	40	45	50	55	60
	WH421	70 deg.	Low Side	21	25	27	29	32	35	39	43	48	53	58	64	71
			High Side	141	147	152	158	163	169	174	180	190	201	214	229	246
	WH483	70 deg.	Low Side	24	26	27	28	29	32	35	39	44	51	58	66	74
			High Side	171	173	176	178	180	184	190	197	205	214	225	237	250
	WH602	70 deg.	Low Side	23	25	27	28	30	32	33	35	42	51	62	75	91
			High Side	178	182	185	189	192	194	196	205	218	236	257	283	313

Low side pressure ± 2 psig

High side pressure ± 5 psig

Tables are based upon rated CFM (airflow) across the evaporator coil. If there is any doubt as to correct operating charge being in the system, the charge should be removed, system evacuated and recharged to serial plate instruction.

Model Description

TABLE 13

OPTIONAL ACCESSORIES

WH421-A

WH421-B

WH421-C

WH483-A

WH483-B

WH483-C

WH602-A

WH602-B

WH602-C

	EHWH42-A05	Heater Packages	X
	EHWH42-A10	Heater Packages	X
	EHWH42-A15	Heater Packages	X
	EHWH42-C06	Heater Packages			X
	EHWH04-A04	Heater Packages				X
	EHWH04-A05	Heater Packages				X			X
	EHWH04-A10	Heater Packages				X			X
	EHWH04-A15	Heater Packages				X			X
	EHWH04-A20	Heater Packages				X			X
	EHWH04-B09	Heater Packages		X			X			X
	EHWH04-B15	Heater Packages		X			X			X
	EHWH04-B18	Heater Packages					X			X
	EHWH04-C09	Heater Packages			X			X			X
	EHWH04-C15	Heater Packages			X			X			X
	BOP-5	Blank Off Plate	X	X	X	X	X	X	X	X	X
	BFAD-5	Barometric Fresh Air Damper	X	X	X	X	X	X	X	X	X
	MFAD-5	Motorized Fresh Air Damper	X	X	X	X	X	X	X	X	X
	CRV-5	Classroom Ventilator with Exhaust	X	X	X	X	X	X	X	X	X
	EIFM-4	Economizer with Exhaust	X	X	X	X	X	X	X	X	X
	WERV-A5B	Energy Recovery Ventilator	X	X		X	X		X	X
	WERV-C5B	Energy Recovery Ventilator			X			X			X
	CMH-3	Low Pressure Control (LPC)		X			X			X
	CMH-7	Low Ambient Control (LAC)		X			X			X
	CMH-9	LAC + LPC		X			X			X
	CMH-14	Outdoor Thermostat (ODT)		X	X	X	X	X	X	X	X
	CMH-15	Start Kit (SK)	X
	WMCB-05B	Circuit Breaker		X
	WMCB-06B	Circuit Breaker					X
	WMPD-01	Circuit Breaker			X			X			X
	WMCB-07B	Circuit Breaker								X
	WMCB-09A	Circuit Breaker				X			X
	WMCB-08B	Circuit Breaker	X

Manual 2100-399

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