Carrier 48-50HJ004-014 User Manual

COBRA™ Energy Recovery Units 48/50HJ004-014 with 62AQ060-300 Single-Package Rooftop Units with Energy Recovery Capability

Installation, Start-Up,

and Service Supplement

IMPORTANT: This is a supplemental instruction for the 48/50HJ and the 62AQ Installation, Start-Up and Service Instructions. It is not intended to take the place of either instruction or to be a complete piece in itself.

CONTENTS

Page

SAFETY CONSIDERATIONS . . . . . . . . . . . . . . . . . . . . . . 1

GENERAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-29

Step 1 — Inspect Shipment . . . . . . . . . . . . . . . . . . . . . . 2

Step 2 — Provide Unit Support . . . . . . . . . . . . . . . . . . . 2

• ROOF CURB

Step 3 — Field Fabricate Ductwork . . . . . . . . . . . . . . . 3

Step 4 — Rig and Place Unit . . . . . . . . . . . . . . . . . . . . . 6

•POSITIONING

Step 5 — Install Flue Hood (48HJ Only) . . . . . . . . . 11 Step 6 — Install Gas Piping (48HJ Only). . . . . . . . . 11

Step 7 — Install External Trap for Condensate Drain. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

Step 8 — Make Electrical Connections . . . . . . . . . . 11

•FIELD POWER SUPPLY

•FACTORY-SUPPLIED NON-FUSED DISCONNECT

•FIELD CONTROL WIRING

•HEAT ANTICIPATOR SETTINGS

Step 9 — Assemble and Mount

Supply-Air Hood . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

Step 10 — Mount the Barometric Relief Damper . . 28

Step 11 — Set the Outdoor Cooling and

Heating Thermostats. . . . . . . . . . . . . . . . . . . . . . . . . . 29

LIGHT COMMERCIAL THERMIDISTAT

ACCESSORY. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30-34

General. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

Power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

Dehumidification Equipment and Connections . . . 30

Step 1 — Select Light Commercial

Thermidistat Location . . . . . . . . . . . . . . . . . . . . . . . . . 30

Step 2 — Set DIP Switches. . . . . . . . . . . . . . . . . . . . . . . 30

Step 3 — Install Light Commercial Thermidistat . . 31

Step 4 — Set Light Commercial Thermidistat

Configuration. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31

Step 5 — Conduct Light Commercial

Thermidistat Start-Up and Checkout . . . . . . . . . . . 33

Step 6 — Make Final Settings . . . . . . . . . . . . . . . . . . . . 34

OPERATIONAL INFORMATION . . . . . . . . . . . . . . . . . . 34

PRE-START-UP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35

START-UP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35

SERVICE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35-37

TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . 38-41

ROOFTOP UNIT AND ENERGY$RECYCLER2

START-UP CHECKLIST . . . . . . . . . . . . . . . . CL-1, CL-2

SAFETY CONSIDERATIONS

Installation and servicing of air-conditioning equipment can be hazardous due to system pressure and electrical components. Only trained and qualified service personnel should install, repair, or service air-conditioning equipment.

Untrained personnel can perform basic maintenance functions of cleaning coils and filters and replacing filters. All other operations should be performed by trained service personnel. When working on air-conditioning equipment, observe precautions in the literature, tags and labels attached to the unit, and other safety precautions that apply.

Verify that the power source supplied to the unit matches the voltages and amperages listed on the unit rating plate.

Follow all safety codes. Wear safety glasses and work gloves. Use quenching cloth for unbrazing operations. Have fire extinguishers available for all brazing operations.

Disconnect gas piping from unit when leak testing at pressure greater than 1/2 psig. Pressures greater than 1/2 psig will cause gas valve damage resulting in hazardous condition. If gas valve is subjected to pressure greater than 1/2 psig, it must be replaced before use. When pressure testing fieldsupplied gas piping at pressures of 1/2 psig or less, a unit connected to such piping must be isolated by manually closing the gas valve.

Before performing service or maintenance operations on unit, turn off main power switch to unit and install a lockout tag. Electrical shock could cause personal injury.

GENERAL

Carrier’s factory-installed optional COBRA Energy Recovery units precondition ventilation air for the rooftop unit during winter and summer operation and recover energy from the building exhaust air. These units are designed to satisfy the higher ventilation requirements and other building codes while minimizing energy costs.

Factory installation of the energy recovery section provides the benefit of reduced field-installation time, single point power connections, and the assurance of a factory test for the complete COBRA Energy Recovery unit. The energy recovery section requires less maintenance than other energy recovery systems and can be serviced by any qualified refrigeration technician.

NOTE: Because of the location of the energy recovery section, the unit nameplate has been moved to the opposite end of the rooftop section, on the upper, right-hand part of the panel.

Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.

Book	1	1	4	4	PC 111 Catalog No. 534-80122	Printed in U.S.A.	Form 48/50HJ,62AQ-2SIS	Pg 1	9-02	Replaces: 48/50HJ,62AQ-1SIS
Tab	1a	1b	6a	6b

INSTALLATION

Step 1 — Inspect Shipment — File a claim with the shipping company if shipment is incomplete or damaged. See Fig. 1 for a typical shipping packaging for a COBRA™ energy recovery unit.

Step 2 — Provide Unit Support

ROOF CURB — The COBRA energy recovery unit can use a full-perimeter roof curb or a standard roof curb for the rooftop section of the unit with a supplemental equipment support for the

energy recovery section. The supplemental equipment support is not required. The standard rooftop unit roof curb is capable of supporting both the rooftop unit section and the energy recovery section. Assemble and install accessory roof curb in accordance with instructions shipped with curb. See Fig. 2A-4. Install insulation, cant strips, roofing felt, and counter flashing as shown.

Ductwork must be attached to curb, not to the unit. The accessory thru-the-bottom power and gas connection package must be installed before the unit is set on the roof curb.

Fig. 1 — Shipping Packaging (48/50HJ004-006 Shown)

		Deck pans
		37 3/16"	2" Return support.
			Only used on some
		67 3/8"
			applications.
	DUCT OPENING SIZES	3 1/4
	Supply = 13 7/8" x 20 1/4"	R 1
			Deck pans
	R1 = 13 5/8" x 17 3/4"
			R2
	R2 = 13 5/8" x 12 5/16"	14”
		Supply
			14"
	R1 = Return from building to HVAC	2"
	R2 = Return from building to 62AQ	92 1/2"
			37 3/16"

SIDE VIEW

END VIEW

Fig. 2A — COBRA Energy Recovery Unit Full-Perimeter Roof Curb — 48/50HJ004-007 with 62AQ060,100

2

	Deck pans
	49 15/16"	2" Return support.
		Only used on some
	78 1/4"	applications.
DUCT OPENING SIZES	3 1/4
Supply = 15 11/16" x 31 3/8"	R1
		Deck pans
R1 = 15 5/16" x 29 1/16"
	14"	R 2
R2 = 15 5/16" x 9"
	Supply
		14"
R1 = Return from building to HVAC	2"
	110 11/16"
R2 = Return from building to 62AQ		49 15/16"

SIDE VIEW

END VIEW

Fig. 2B — COBRA™ Energy Recovery Unit Full-Perimeter Roof Curb — 48/50HJ008-014 with 62AQ200,300

If electric control power or gas service is to be routed through the basepan, a field-installed accessory thru-the- bottom connection must be used. Attach the accessory to the basepan per the information in the accessory installation instructions. Thru-the-bottom connections must be installed before unit is set on roof.

If the combined unit roof curb is not being used, additional support may be desired under the energy recovery section of the unit. An accessory support and pad for the energy recovery section can be used. See Fig. 4. Place the protective rubber pad on the roof so that the edge near the unit is located about 6-in. from the end of the energy recovery section. Measure the distance from the bottom of energy recovery rails to the pad. Adjust the energy recovery equipment support to match the measured distance and screw into place with the 4 screws provided. See Fig. 4. Place the support underneath the energy recovery unit and on the protective rubber pad. This is done by lifting the end of the energy recovery section slightly above level and then sliding the support underneath the rails.

IMPORTANT: The gasketing of the unit to the roof curb is critical for a watertight seal. Install gasket supplied with the roof curb as shown in Fig. 3A and 3B. Improperly applied gasket can result in air leaks and poor unit performance.

Curb should be level. This is necessary for unit condensate drain to function properly. Refer to Accessory Roof Curb Installation Instructions for additional information as required.

Step 3 — Field Fabricate Ductwork — Secure all ducts to roof curb and building structure. Do not connect ductwork to unit. Insulate and weatherproof all external ductwork, joints, and roof openings with counter flashing and mastic in accordance with applicable codes. See Fig. 5A and 5B for duct dimensions.

Ducts passing through an unconditioned space must be insulated and covered with a vapor barrier. If a plenum return is used, the return should be ducted through the roof deck to comply with applicable fire codes.

A minimum clearance is not required around ductwork.

These units are designed for a minimum continuous heating return-air temperature of 50 F (dry bulb), or an intermittent operation down to 45 F (dry bulb), such as when used with a night set-back thermostat. To operate at lower return-air temperatures, a field-supplied outdoor-air temperature control must be used to initiate both stages of heat when the temperature is below 45 F. Indoor comfort may be compromised when these lower air temperatures are used with insufficient heating temperature rise.

3

CONNECTOR

B

C

D ALT

GAS

POWER

CONTROL

PKG. ACCY.

DRAIN HOLE

CRBTMPWR001A00

3/4″

3/4″ [19] NPT

1/2″

CRBTMPWR002A00

1′-911/16″

1′-4″

13/4″

[19] NPT

11/4″ [31.7]

[12.7]

CRBTMPWR003A00

1

/2″

3/4″ [19] NPT

[551]

[406]

[44.5]

1/2″

[12.7] NPT

CRBTMPWR004A00

3

/4″

11/4″ [31.7]

[12.7]

[19] NPT

	ROOF CURB	A	UNIT SIZE
	ACCESSORY
	CRRFCURB001A00	1′-2″
		[356]	48/50HJ
	CRRFCURB002A00	2′-0″	004-007
		[610]

NOTES:

1.Roof curb accessory is shipped disassembled.

2.Insulated panels.

3. Dimensions in [ ] are in millimeters.

4.Roof curb: galvanized steel.

5.Attach ductwork to curb (flanges of duct rest on curb).

6.Service clearance: 4 ft on each side.

7. Direction of airflow.

8.Connector packages CRBTMPWR001A00 and 002A00 are for thru-the-curb type gas. Packages CRBTMPWR003A00 and 004A00 are for thru-the- bottom type gas connections.

TO ENSURE AIRTIGHT CONNECTION.

PLACE UNIT AS CLOSE TO THIS

END AS POSSIBLE

TO ENSURE AIRTIGHT CONNECTION.

PLACE UNIT AS CLOSE TO THIS

END AS POSSIBLE

Fig. 3A — Roof Curb Details (48/50HJ004-007 Section Only)

4

CONNECTOR

D ALT

B

C

DRAIN

GAS

POWER

CONTROL

PKG. ACCY.

HOLE

CRBTMPWR001A00

3/4″

3/4″ [19] NPT

1/2″

CRBTMPWR002A00

2′-87/16″

1′-1015/16″

13/4″

[19] NPT

11/4″ [31.7]

[12.7] NPT

CRBTMPWR003A00

1

/2″

3/4″ [19] NPT

[827]

[583]

[44.5]

1/2″

[12.7] NPT

CRBTMPWR004A00

3

/4″

11/4″ [31.7]

[12.7] NPT

[19] NPT

	ROOF CURB	“A”	UNIT SIZE
	ACCESSORY		48/50HJ
	CRRFCURB003A00	1′-2″ [356]	008-014
	CRRFCURB004A00	2′-0″ [610]

NOTES:

1.Roof curb accessory is shipped disassembled.

2.Insulated panels: 1-in. thick polyurethane foam,

13/4 lb density.

3. Dimensions in [ ] are in millimeters.

4.Roof curb: 16-gage steel.

5.Attach ductwork to curb (flanges of duct rest on curb).

6.Service clearance 4 ft on each side.

7. Direction of airflow.

8.Connector packages CRBTMPWR001A00 and 2A00 are for thru-the-curb gas type. Packages CRBTMPWR003A00 and 4A00 are for thru- the-bottom type gas connections.

TO ENSURE AN AIRTIGHT CONNECTION,

PLACE UNIT ON CURB AS CLOSE TO

DUCT END AS POSSIBLE.

TO ENSURE AN AIRTIGHT CONNECTION,

PLACE UNIT ON CURB AS CLOSE TO

DUCT END AS POSSIBLE.

Fig. 3B — Roof Curb Details (48/50HJ008-014 Section Only)

5

		UNIT SIZE		EQUIPMENT SUPPORT		DIMENSIONS (in.)
	4”			PART NUMBER		A	B	C
		3-6 Ton		CRAQSUPT001A00		36.9	40	8 to 14
	A			CRAQSUPT002A00		36.9	40	14 to 24
				CRAQSUPT003A00		49.7	54	8 to 14
	71/2-121/2		Ton
				CRAQSUPT004A00		49.7	54	14 to 24

		ENERGY	HVAC UNIT
		RECOVERY
C”		SECTION
	SCREW
	SUPPORT
	IN PLACE	PAD
	ADJUSTABLE		CURB
	EQUIPMENT
		ROOF
	SUPPORT

10” x B (SEE CHART) PROTECTIVE RUBBER PAD (EPDM)

Fig. 4 — Supplemental Energy Recovery Section Equipment Support

Step 4 — Rig and Place Unit — Keep unit upright and do not drop. Spreader bars are not required if top crating is left on unit. Rollers may be used to move unit across a roof. Remove the bottom wooden skids that are under the unit by removing the wooden plates that hold the bottom wooden frame to the unit. Level by using unit frame as a reference. Lifting holes are provided in base rails as shown in Fig. 6A and 6B. Refer to rigging instructions on unit.

All panels must be in place when rigging.

POSITIONING — Maintain clearance around and above unit to provide minimum distance from combustible materials, proper airflow, and service access. A properly positioned unit will have the following clearances between unit and roof curb: 1/4-in. clearance between roof curb and base rails on each side and duct end of unit; 1/4-in. clearance between roof curb and condenser coil end of unit.

Do not install unit in an indoor location. Do not locate unit air inlets near exhaust vents or other sources of contaminated air.

Be sure that unit is installed such that snow will not block the combustion intake or flue outlet.

Unit may be installed directly on wood flooring or on Class A, B, or C roof-covering material when roof curb is used.

Although unit is weatherproof, guard against water from higher level runoff and overhangs.

Flue vent discharge must have a minimum horizontal clearance of 4 ft from electric and gas meters, gas regulators, and gas relief equipment.

Minimum distance between unit and other electrically live parts is 48 inches.

Flue gas can deteriorate building materials. Orient unit such that flue gas will not affect building materials. Locate mechanical draft system flue assembly at least 48 in. from an adjacent building or combustible material.

Adequate combustionand ventilation-air space must be provided for proper operation of this equipment. Be sure that installation complies with all local codes and Section 5.3, Air for Combustion and Ventilation, NFGC (National Fuel Gas Code), and ANSI (American National Standards Institute) Z223.1, and NFPA (National Fire Protection Association) 54 TIA-54-84-1. In Canada, installation must be in accordance with the CAN1-B149 installation codes for gas burning appliances.

After unit is in position, remove rigging skids and shipping materials.

6

REAR

	RIGHT
LEFT	SIDE
SIDE

7

FRONT

RIGHT SIDE

LEFT SIDE

FRONT

Fig. 5A — Base Unit Dimensions — COBRA™ Energy Recovery Unit — 48/50HJ004-007 with 62AQ060,100

8

Fig. 5A — Base Unit Dimensions — COBRA™ Energy Recovery Unit — 48/50HJ004-007 with 62AQ060,100 (cont)

9

Fig. 5B — Base Unit Dimensions — COBRA™ Energy Recovery Unit — 48/50HJ008-014 with 62AQ200,300

10

Fig. 5B — Base Unit Dimensions — COBRA™ Energy Recovery Unit — 48/50HJ008-014 with 62AQ200,300 (cont)

		MAX WEIGHT			A		B			C
		lb	kg	in.	mm	in		mm	in.		mm
48HJ004 w/62AQ060		890	404	95.6	2428.20	57.38		1457.30	33.35		847
48HJ004 w/62AQ100		905	411	95.6	2428.20	57.38		1457.30	33.35		847
48HJ005 w/62AQ060		900	409	95.6	2428.20	57.38		1457.30	33.35		847
48HJ005 w/62AQ100		915	415	95.6	2428.20	57.38		1457.30	33.35		847
48HJ006 w/62AQ060		920	418	95.6	2428.20	57.38		1457.30	33.35		847
48HJ006 w/62AQ100		935	425	95.6	2428.20	57.38		1457.30	33.35		847
48HJ007 w/62AQ060		995	452	95.6	2428.20	57.38		1457.30	42.12		1070
48HJ007 w/62AQ100		1010	459	95.6	2428.20	57.38		1457.30	42.12		1070
50HJ004 w/62AQ060		795	361	95.6	2428.20	57.38		1457.30	33.35		847
50HJ004 w/62AQ100		810	368	95.6	2428.20	57.38		1457.30	33.35		847
50HJ005 w/62AQ060		805	365	95.6	2428.20	57.38		1457.30	33.35		847
50HJ005 w/62AQ100		820	372	95.6	2428.20	57.38		1457.30	33.35		847
50HJ006 w/62AQ060		825	375	95.6	2428.20	57.38		1457.30	33.35		847
50HJ006 w/62AQ100		840	381	95.6	2428.20	57.38		1457.30	33.35		847
50HJ007 w/62AQ060		880	400	95.6	2428.20	57.38		1457.30	42.12		1070
50HJ007 w/62AQ100		895	407	95.6	2428.20	57.38		1457.30	42.12		1070

Fig. 6A — Rigging Label — COBRA™ Energy Recovery Unit — Sizes 48/50HJ004-007

Step 5 — Install Flue Hood (48HJ Rooftop Sections Only) — Refer to the 48HJ installation instructions for information on installing the flue hood.

Step 6 — Install Gas Piping (48HJ Rooftop Sections Only) — Refer to the 48HJ installation instructions for information on installing the gas piping.

Step 7 — Install External Trap For Condensate Drain — The condensate from the rooftop unit along with condensate from the upper coil of the energy recovery section is internally piped to the condensate pan in the lower section of the energy recovery section. For this reason, the bottom drain on the rooftop unit CANNOT be used for a condensate drain. The 3/4-in. drain connection on the energy recovery section is located near the bottom left of the exhaust air section. See Fig. 5A and 5B. The energy recovery section must have a field-fabricated, external, P-trap installed for condensate drainage. Trap must be at least 4-in. deep to protect against freezeup. If the drain line is installed downstream from the external

trap, pitch the line away from the unit at 1-in. per 10-ft of run. Do not use a pipe smaller than the connection (3/4-in.).

Step 8 — Make Electrical Connections

Unit cabinet must have an uninterrupted, unbroken electrical ground to minimize the possibility of personal injury if an electrical fault should occur. This ground may consist of electrical wire connected to unit ground lug in control compartment, or conduit approved for electrical ground when installed in accordance with NEC (National Electrical Code), ANSI/NFPA, latest edition, and local electrical codes. Do not use gas piping as an electrical ground. Failure to follow this warning could result in the installer being liable for personal injury of others.

FIELD POWER SUPPLY — All units except 208/230-v units are factory wired for the voltage shown on the nameplate.

11

															MAX WEIGHT															A												B					C
																lb					kg						in.							mm						in.			mm			in.	mm
48HJ008 w/62AQ200									1310										595						77.42				1966.5										66.50			1689.10				42.12	1070
48HJ008 w/62AQ300									1355										616						77.42				1966.5										66.50			1689.10				42.12	1070
48HJ009 w/62AQ200									1315										597						77.42				1966.5										66.50			1689.10				42.12	1070
48HJ009 w/62AQ300									1360										618						77.42				1966.5										66.50			1689.10				42.12	1070
48HJ012 w/62AQ200									1400										636						77.42				1966.5										66.50			1689.10				50.12	1273
48HJ012 w/62AQ300									1445										657						77.42				1966.5										66.50			1689.10				50.12	1273
48HJ014 w/62AQ200									1440										655						77.42				1966.5										66.50			1689.10				50.12	1273
48HJ014 w/62AQ300									1485										675						77.42				1966.5										66.50			1689.10				50.12	1273
50HJ008 w/62AQ200									1240										564						77.42				1966.5										66.50			1689.10				42.12	1070
50HJ008 w/62AQ300									1285										584						77.42				1966.5										66.50			1689.10				42.12	1070
50HJ009 w/62AQ200									1245										566						77.42				1966.5										66.50			1689.10				42.12	1070
50HJ009 w/62AQ300									1290										586						77.42				1966.5										66.50			1689.10				42.12	1070
50HJ012 w/62AQ200									1325										602						77.42				1966.5										66.50			1689.10				42.12	1070
50HJ012 w/62AQ300									1370										623						77.42				1966.5										66.50			1689.10				42.12	1070
50HJ014 w/62AQ200									1345										620						77.42				1966.5										66.50			1689.10				42.12	1070
50HJ014 w/62AQ300									1410										641						77.42				1966.5										66.50			1689.10				42.12	1070

Fig. 6B — Rigging Label — COBRA™ Energy Recovery Unit — Sizes 48/50HJ008-014

If the 208/230-v unit is to be connected to a 208-v power supply, the transformer must be rewired by moving the black wire with the 1/4-in. female space connector from the 230-volt connection and moving to the 200-volt 1/4-in. male terminal on the primary side of the transformer.

Refer to unit label diagram for additional information. Pigtails are provided for field wire connections. Use factorysupplied splices or UL (Underwriters’ Laboratories) approved copper/aluminum connector.

When installing units, provide a disconnect per the NEC.

All field wiring must comply with NEC and local requirements.

Install field wiring as follows:

1.Install conduit through side panel openings. Install conduit between disconnect and control box.

2.Install power lines to terminal connections as shown in Fig. 7.

Voltage to compressor terminals during operation must be within voltage range indicated on unit nameplate (see Tables 1A-1H). On 3-phase units, voltages between phases must be balanced within 2% and the current within 10%. Use the formula shown in the legend for Tables 1A-1H, Note 2 to determine the percent of voltage imbalance. Operation on improper line voltage or excessive phase imbalance constitutes abuse and

may cause damage to electrical components. Such operation would invalidate any applicable Carrier warranty.

FACTORY-SUPPLIED NON-FUSED DISCONNECT — The factory-supplied disconnect is capable of handling disconnect amps up to 80 A for a COBRA Energy Recovery unit. For disconnect amps greater than 80 A, a field-supplied disconnect is required.

FIELD CONTROL WIRING — Install a Carrier-approved accessory thermidistat assembly according to installation instructions included with the accessory. Locate thermidistat assembly on a solid wall in the conditioned space to sense average temperature in accordance with thermidistat installation instructions on page 30. Connect thermidistat wires to terminal board.

Route thermidistat cable or equivalent single leads of colored wire from subbase terminals through connector on unit to low-voltage connections (shown in Fig. 8). Thermidistat control wiring is routed to both the rooftop unit control box and the energy recovery section control box.

If a PremierLink™ control is used, a thermidistat does not need to be used. A humidistat and a separate room air sensor are used. Two extra terminal blocks (TB2 and TB3) are provided in the control box for all units with PremierLink controls. No wiring should be directly connected to the PremierLink control. Wire sensors to TB2 or TB3. Humidistat is wired to TB1 and energy recovery section control box.

12

NOTE: For wire runs up 50 ft, use no. 18 AWG (American Wire Gage) insulated wire (35 C minimum). For 50 to 75 ft, use no. 16 AWG insulated wire (35 C minimum). For over 75 ft, use no. 14 AWG insulated wire (35 C minimum). All wire larger than no. 18 AWG cannot be directly connected to the thermostat and will require a junction box and splice at the thermostat.

Pass the control wires through the hole provided in the corner post; then feed wires through the raceway built into the corner post to the 24-v barrier located on the left side of the

control box. See Fig. 10. The raceway provides the UL required clearance between highand low-voltage wiring.

NOTE: A humidistat and a temperature sensor can be used in place of a thermidistat for PremierLink™ units.

HEAT ANTICIPATOR SETTINGS — Set heat anticipator settings at .14 amp for the first stage and .14 amp for secondstage heating, when available.

Table 1A — Electrical Data (COBRA™ Energy Recovery 48HJ004-007 Units with 62AQ060)

	NOMINAL	IFM	CONV	62AQ	POWER SUPPLY		DISCONNECT SIZE*
UNIT	V-PH-Hz	TYPE	OUTLET	FLA	MCA	FUSE OR	FLA	LRA
						HACR BKR
	208/230-1-60	STD	NO	9.2	34.8/34.8	40/40	35/35	135/135
		STD	YES	9.2	40.8/40.8	45/45	41/41	140/140
		STD	NO	9.2	27.7/27.7	35/35	29/29	124/124
	208/230-3-60	STD	YES	9.2	33.7/33.7	40/35	34/34	129/129
		HIGH STATIC	NO	9.2	28.6/28.6	35/35	30/30	154/154
48HJ004
		HIGH STATIC	YES	9.2	34.6/34.6	40/40	35/35	158/158
		STD	NO	9.2	13.6	20	14	63
	460-3-60	STD	YES	9.2	16.3	20	20	67
		HIGH STATIC	NO	9.2	14.0	20	15	77
		HIGH STATIC	YES	9.2	16.7	20	20	82
	208/230-1-60	STD	NO	9.2	44.4/44.4	60/60	44/44	173/173
		STD	YES	9.2	50.4/50.4	60/60	50/50	178/178
		STD	NO	9.2	31.7/31.7	40/40	33/33	140/140
	208/230-3-60	STD	YES	9.2	37.7/37.7	40/40	38/38	145/145
48HJ005		HIGH STATIC	NO	9.2	32.6/32.6	40/40	34/34	170/170
		HIGH STATIC	YES	9.2	38.6/38.6	45/45	39/39	174/174
		STD	NO	9.2	15.2	20	16	70
	460-3-60	STD	YES	9.2	17.9	20	21	75
		HIGH STATIC	NO	9.2	15.6	20	16	84
		HIGH STATIC	YES	9.2	18.3	20	22	89
	208/230-1-60	STD	NO	9.2	55.5/55.5	70/70	56/56	250/250
		STD	YES	9.2	61.5/61.5	70/70	61/61	255/255
		STD	NO	9.2	38.1/38.1	45/45	39/39	202/202
	208/230-3-60	STD	YES	9.2	44.1/44.1	50/50	44/44	207/207
		HIGH STATIC	NO	9.2	39.8/39.8	45/45	41/41	221/221
48HJ006
		HIGH STATIC	YES	9.2	45.8/45.8	50/50	46/46	226/226
		STD	NO	9.2	19.3	25	20	101
	460-3-60	STD	YES	9.2	22.0	25	25	106
		HIGH STATIC	NO	9.2	20.1	25	20	110
		HIGH STATIC	YES	9.2	22.8	25	26	115
	208/230-3-60	STD	NO	9.2	42.0/42.0	50/50	42/42	234/234
		STD	YES	9.2	48.0/48.0	60/60	48/48	239/239
	208/230-3-60	HIGH STATIC	NO	9.2	43.7/43.7	50/50	44/44	253/253
		HIGH STATIC	YES	9.2	49.7/49.7	60/60	50/50	258/258
48HJ007
		STD	NO	9.2	19.8	25	20	114
	460-3-60	STD	YES	9.2	22.5	25	26	118
		HIGH STATIC	NO	9.2	20.6	25	21	123
		HIGH STATIC	YES	9.2	23.3	30	26	128

	LEGEND
FLA	— Full Load Amps
HACR	— Heating, Air Conditioning and Refrigeration
IFM	— Indoor (Evaporator) Fan Motor
LRA	— Locked Rotor Amps
MCA	— Minimum Circuit Amps
MOCP — Maximum Overcurrent Protection
NEC	— National Electrical Code
UL	— Underwriters’ Laboratories

*Used to determine minimum disconnect per NEC.

†Single point box CRSINGLE017A00 is part of base unit.

NOTES:

1.In compliance with NEC requirements for multimotor and combination load equipment (refer to NEC Articles 430 and 440), the overcurrent protective device for the unit shall be fuse or HACR breaker. UL, Canada units may be fuse or circuit breaker.

2.Unbalanced 3-Phase Supply Voltage

Never operate a motor where a phase imbalance in supply voltage is greater than 2%. Use the following formula to determine the percent of voltage imbalance.

= 100 x

max voltage deviation from average voltage

average voltage

Example: Supply voltage is 460-3-60.

AB = 452 v

BC = 464 v

AC = 455 v

Average Voltage =

452 + 464 + 455

3

=

1371

3

= 457

Determine maximum deviation from average voltage. (AB) 457 – 452 = 5 v

(BC) 464 – 457 = 7 v (AC) 457 – 455 = 2 v

Maximum deviation is 7 v.

Determine percent of voltage imbalance.

7 % Voltage Imbalance = 100 x 457

= 1.53%

This amount of phase imbalance is satisfactory as it is below the maximum allowable 2%.

IMPORTANT: If the supply voltage phase imbalance is more than 2%, contact your local electric utility company immediately.

13

Table 1B — Electrical Data (COBRA™ Energy Recovery 50HJ004-007 Units with 62AQ060)

						HEATER	HEAT		POWER SUPPLY				SINGLE	DISCONNECT SIZE*
	UNIT	NOMINAL	IFM	CONV	62AQ	CRHEATER				FUSE OR			POINT BOX
		V-PH-Hz	TYPE	OUTLET	FLA		FLA	MCA			MOCP		CRSINGLE	FLA		LRA
						---A00				HACR BKR
													---A00
						NONE	—/—	34.8/ 34.8		40/40	—		—	35/ 35		135/135
						001	15.9/18.3	35.7/	38.8	40/45	—		—	35/	37	135/135
			STD	NO	9.2	002	23.5/27.1	45.2/	49.7	50/50	—		—	43/	47	135/135
						003	31.4/36.3	55.1/	61.2	—	60/	70	004	52/	58	135/135
						004	37.9/43.8	63.2/	70.5	—	70/	80	004	60/	67	135/135
		208/230-1-60				002+002	46.9/54.2	74.5/	83.6	—	80/	90	005	70/	79	135/135
						NONE	—/—	40.8/ 40.8		45/45	—		—	41/ 41		140/140
						001	15.9/18.3	40.8/	43.0	45/50	—		—	41/	42	140/140
			STD	YES	9.2	002	23.5/27.1	50.0/	53.9	60/60	—		—	49/	52	140/140
						003	31.4/36.3	59.9/	65.4	—	60/	70	004	58/	63	140/140
						004	37.9/43.8	68.0/	74.7	—	70/	80	005	65/	71	140/140
						002+002	46.9/54.2	79.3/	87.8	—	80/	90	005	76/	83	140/140
						NONE	—/—	27.7/ 27.7		35/35	—		—	29/ 29		124/124
						001	9.2/10.6	27.7/	29.1	35/35	—		—	29/	29	124/124
			STD	NO	9.2	002	13.6/15.6	32.8/	35.4	40/40	—		—	32/	34	124/124
						003	18.1/20.9	38.5/	42.0	45/45	—		—	37/	40	124/124
						004	21.9/25.3	43.2/	47.4	45/50	—		—	41/	45	124/124
						005	33.4/38.5	57.5/	64.0	—	60/	70	002	55/	60	124/124
						NONE	—/—	33.7/ 33.7		40/35	—		—	34/ 34		129/129
						001	9.2/10.6	33.7/	33.7	40/40	—		—	34/	34	129/129
			STD	YES	9.2	002	13.6/15.6	37.6/	39.6	45/45	—		—	37/	39	129/129
						003	18.1/20.9	43.3/	46.2	50/50	—		—	43/	45	129/129
						004	21.9/25.3	48.0/	51.6	50/60	—		—	47/	50	129/129
		208/230-3-60				005	33.4/38.5	62.3/	68.2	—	70/	70	002	60/	65	129/129
						NONE	—/—	28.6/ 28.6		35/35	—		—	30/ 30		154/154
						001	9.2/10.6	28.6/	30.0	35/35	—		—	30/	30	154/154
			HIGH STATIC	NO	9.2	002	13.6/15.6	33.7/	36.3	40/40	—		—	33/	35	154/154
						003	18.1/20.9	39.4/	42.9	45/45	—		—	38/	41	154/154
	50HJ004
						004	21.9/25.3	44.1/	48.3	50/50	—		—	42/	46	154/154
						005	33.4/38.5	58.4/	64.9	—	60/	70	002	56/	62	154/154
						NONE	—/—	34.6/ 34.6		40/40	—		—	35/ 35		158/158
						001	9.2/10.6	34.6/	34.6	40/40	—		—	35/	35	158/158
			HIGH STATIC	YES	9.2	002	13.6/15.6	38.5/	40.5	45/45	—		—	38/	40	158/158
						003	18.1/20.9	44.2/	47.1	50/50	—		—	44/	46	158/158
						004	21.9/25.3	48.9/	52.5	60/60	—		—	48/	51	158/158
						005	33.4/38.5	63.2/	69.1	—	70/	70	003	61/	66	158/158
						NONE	—	13.6		20	—		—	14		63
						006	7.2	16.7		20	—		—	14		63
			STD	NO	9.2	007	10.6	20.9		25	—		—	15		63
						008	13.8	25.0		25	—		—	24		63
						009	16.8	28.7		30	—		—	27		63
						NONE	—	16.3		20	—		—	20		67
						006	7.2	18.8		25	—		—	20		68
			STD	YES	9.2	007	10.6	23.0		25	—		—	20		68
						008	13.8	27.1		30	—		—	29		68
		460-3-60				009	16.8	30.8		35	—		—	32		68
						NONE	—	14.0		20	—		—	15		77
						006	7.2	17.1		20	—		—	15		77
			HIGH STATIC	NO	9.2	007	10.6	21.3		25	—		—	15		77
						008	13.8	25.4		30	—		—	24		77
						009	16.8	29.1		30	—		—	28		77
						NONE	—	16.7		20	—		—	20		82
						006	7.2	19.2		25	—		—	20		82
			HIGH STATIC	YES	9.2	007	10.6	23.4		25	—		—	20		82
						008	13.8	27.5		30	—		—	29		82
						009	16.8	31.2		35	—		—	32		82
						NONE	—/—	44.4/ 44.4		60/60	—		—	44/ 44		173/173
						001	15.9/18.3	44.4/	44.4	60/60	—		—	44/	44	173/173
			STD	NO	9.2	003	31.4/36.3	55.1/	61.2	—	60/	70	004	52/	58	173/173
						002+002	46.9/54.2	74.5/	83.6	—	80/	90	005	70/	79	173/173
						003+003	62.8/72.5	94.4/106.5		—	100/110		005	88/100		173/173
		208/230-1-60				004+004	75.8/87.5	110.6/125.2		—	125/150		005	103/117		173/173
						NONE	—/—	50.4/ 50.4		60/60	—		—	50/ 50		178/178
						001	15.9/18.3	50.4/	50.4	60/60	—		—	50/	50	178/178
			STD	YES	9.2	003	31.4/36.3	59.9/	65.4	—	60/	70	004	58/	63	178/178
						002+002	46.9/54.2	79.3/	87.8	—	80/	90	005	76/	83	178/178
						003+003	62.8/72.5	99.2/110.7		—	100/125		005	94/104		178/178
						004+004	75.8/87.5	115.4/129.4		—	125/150		005	109/122		178/178
						NONE	—/—	31.7/ 31.7		40/40	—		—	33/ 33		140/140
						002	13.6/15.6	32.8/	35.4	40/40	—		—	33/	34	140/140
			STD	NO	9.2	003	18.1/20.9	38.5/ 42.0		45/45	—		—	37/ 40		140/140
						005	33.4/38.5	57.5/	64.0	—	60/	70	002	55/	60	140/140
						004+004	43.8/50.5	70.6/	79.0	—	80/	80	003	67/	74	140/140
	50HJ005					NONE	—/—	37.7/ 37.7		40/40	—		—	38/ 38		145/145
						002	13.6/15.6	37.7/	39.6	45/45	—		—	38/	39	145/145
			STD	YES	9.2	003	18.1/20.9	43.3/ 46.2		50/50	—		—	43/ 45		145/145
						005	33.4/38.5	62.3/	68.2	—	70/	70	002	60/	65	145/145
		208/230-3-60				004+004	43.8/50.5	75.4/	83.2	—	80/	90	003	72/	79	145/145
						NONE	—/—	32.6/ 32.6		40/40	—		—	34/ 34		170/170
						002	13.6/15.6	33.7/	36.3	40/40	—		—	34/	35	170/170
			HIGH STATIC	NO	9.2	003	18.1/20.9	39.4/ 42.9		45/45	—		—	38/ 41		170/170
						005	33.4/38.5	58.4/	64.9	—	60/	70	002	56/	62	170/170
						004+004	43.8/50.5	71.5/	79.9	—	80/	80	003	68/	75	170/170
						NONE	—/—	38.6/ 38.6		45/45	—		—	39/ 39		174/174
						002	13.6/15.6	38.6/	40.5	45/45	—		—	39/	40	174/174
			HIGH STATIC	YES	9.2	003	18.1/20.9	44.2/ 47.1		50/50	—		—	44/ 46		174/174
						005	33.4/38.5	63.2/	69.1	—	70/	70	003	61/	66	174/174
						004+004	43.8/50.5	76.3/	84.1	—	80/	90	003	73/	80	174/174
						NONE	—	15.2		20	—		—	16		70
		460-3-60	STD	NO	9.2	006	7.2	16.7		20	—		—	16		71
						008	13.8	25.0		25	—		—	18		71
						009	16.8	28.7		30	—		—	27		71
						008+008	27.7	42.3		45	—		025	40		71

14