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5168274-BIM-I-1121

Johnson Controls Ducted Systems

13

Ductwork

Ductwork should be designed and sized according to the 
methods in Manual D of the Air Conditioning Contractors of 
America (ACCA) or as recommended by any other recognized 
authority such as ASHRAE or SMACNA.

A closed return duct system should be used. This will not 
preclude use of economizers or outdoor fresh air intake. The 
supply and return air duct connections at the unit should be 
made with flexible joints to minimize noise.

The supply and return air duct systems should be designed for 
the CFM and static pressure requirements of the job. They 
should NOT be sized to match the dimensions of the duct 
connections on the unit.

Refer to Figures 7 and 8 for bottom air duct openings. Refer to 
Figure 9 for side air duct openings.

NOTE: 

It is recommended that, in Canada, the outlet duct be 
provided with a removable access panel. It is 
recommended that this opening be accessible when 
the unit is installed in service, and of a size such that 
smoke or reflected light may be observed inside the 
casing to indicate the presence of leaks in the heat 
exchanger. The cover should be attached in a 
manner adequate to prevent leakage.

Fixed Outdoor Air Intake Damper

This damper is shipped inside the return air compartment. It is 
completely assembled and ready for installation. A damper 
baffle inside of the hood is adjustable to provide variable 
amounts of outdoor air intake on units that are not provided with 
an economizer or a motorized damper option. Refer to the 
Fixed Outdoor Damper Figure 12.

Gasketing and mounting screws are provided in a parts bag 
attached to the hood assembly. Apply gasketing to the three 
flange surfaces on the hood prior to installing the hood. Extend 
gasketing 1/4 inch beyond the top and bottom of the two side 
flanges to insure adequate sealing.

Adjusting the damper to the desired air flow may be done 
before mounting the hood into position or after installation by 
removing the front hood panel or the screen on the bottom of 
the hood. Damper baffle in position 1 will allow approximately 
10% outdoor air flow, position 2 approximately 15% and, to 
allow approximately 25%, remove the damper baffle.

On units with bottom return air application install the damper 
assembly over the opening in the side return air access panel. 
Remove and discard the opening cover and the covering over 
the hood mounting holes (used for shipping) before installing. 
Secure with the screws provided.

On units with side return air applications, install the damper 
assembly on the return air ductwork as close to the unit as 
possible. Cut an opening 16 inches high by 18 inches wide in the 
ductwork to accommodate the damper. Using the holes in the 

hood flanges as a template, drill 9/64 inch diameter (#26 drill) 
holes into the ductwork and secure with the screws provided.

Figure 12: Fixed Outdoor Air Damper

Condensate Drain

Plumbing must conform to local codes. Use a sealing compound 
on male pipe threads. Install a condensate drain line from the 
one-inch NPT female connection on the unit to an open drain.

NOTE: 

The condensate drain operates in a negative pressure 
in the cabinet. The condensate drain line MUST be 
trapped to provide proper drainage. See Figure 13.

Figure 13: Condensate Drain

If outdoor air intake will not be required on units with 
bottom return air applications, the damper assembly 
should still be mounted on the side return air access 
panel, per the instructions above, to insure moisture is 
not drawn into the unit during operation. The covering 
over the mounting holes only need be removed. Do not 
remove the opening cover.

*

Side Supply

Air Access

Panel

Damper

Baffle

Hood

Screen

* Gasketed

Flange

Rear View

Side Return Air

Access Panel

Outdoor Air

Opening Cover

2

1

Base

Pan

Base

Rails

Drain

Plug

2”

3” Min.

Unit Condensate

Connection

Summary of Contents for XA Series

Page 1: ...XA 15 XA 20 Physical Data 21 8 Electric Heat Minimum Supply Air 22 9 Smart Equipment Economizer Board Details 25 10 Altitude Temperature Correction Factors 30 11 Air Flow Performance Side Duct Applica...

Page 2: ...other applicable safety precautions and codes including ANSI Z223 1 or CSA B149 1 latest edition Wear safety glasses and work gloves Use quenching cloth and have a fire extinguisher available during b...

Page 3: ...t your local Ducted Systems parts distribution center for authorized replacement parts Approvals Design certified by CSA as follows 1 For use as a Heat Pump unit with supplemental electric heat 2 For...

Page 4: ...ys Single Zone N Verasys Change Over Bypass P Verasys VAV Controls Option 15 20 Ton Model Number Nomenclature 00 00 Cooling Only A B Standard Static D High Static E VFD VAV Std Static G VFD VAV High S...

Page 5: ...dian Electrical Code CSA C22 1 2 Installation Codes CSA B149 1 3 Local plumbing and waste water codes and 4 Other applicable local codes Refer to unit application data found in this document If compon...

Page 6: ...60 5 432 504 125 575 3 60 5 540 630 125 Smart Equipment Control Board 110 Volt Convenience Outlet Powered or Non Powered Optional Disconnect Location Optional Disconnect Switch Bottom Power and Contr...

Page 7: ...to Table 4 for clearances required for combustible construction servicing and proper unit operation Rigging And Handling Exercise care when moving the unit Do not remove any packaging until the unit i...

Page 8: ...Weight Figure 6 Center of Gravity A D B C A D E C F B A B C D FRONT A C D F B E FRONT Table 2 XA 15 XA 20 Unit Weight Size Tons Model Weight lbs Center of Gravity 4 Point Load Location lbs 6 Point Loa...

Page 9: ...ont 3 4 NPS Fem Bottom B 3 5 8 KO Power Wiring Front 3 NPS Fem Bottom 6 7 8 A CONTROL WIRING ENTRY COIL GUARD KIT CONDENSER COILS B POWER WIRING ENTRY 5 43 3 4 9 3 4 35 5 7 8 136 1 4 DOT PLUG For pres...

Page 10: ...roper size of the supply and return air duct connections UNIT BASE WITH RAILS Shown separately to illustrate Bottom Duct openings and Power Connection locations 12 1 2 9 1 4 8 1 8 9 3 4 3 3 4 B POWER...

Page 11: ...ncludes a power exhaust option The covering consists of a heavy black paper composition 3 Replace the side supply and return air compartment panels For side duct applications 1 Replace the side panels...

Page 12: ...may be installed on combustable floors made from wood or class A B or C roof covering materials 0 Rear 24 W O Economizer Left 24 W O Economizer 49 W Economizer 36 W Economizer 3 3 If economizer is fac...

Page 13: ...ges to insure adequate sealing Adjusting the damper to the desired air flow may be done before mounting the hood into position or after installation by removing the front hood panel or the screen on t...

Page 14: ...essor terminals during starting and running conditions are indicated on the unit Rating Plate and Table 1 The internal wiring harnesses furnished with this unit are an integral part of the design cert...

Page 15: ...tions enclosed with thermostat for general installation procedure Color coded insulated wires should be used to connect the thermostat to the unit Refer to Table 5 for control wire sizing and maximum...

Page 16: ...Y1 G OCC Y2 X R SD 24 C W1 2 24V C 24 VAC Class 2 SD 24 Jumper Located on Harness Smoke Detector SD R 24V Output R If No Smoke Detector If Smoke Detector Is Used R Occ Jumper Smart Equipment Control...

Page 17: ...100 19 2 15 6 5 0 NONE 38 3 50 E18 18 1 21 7 65 3 70 E36 36 2 43 3 65 3 70 E54 54 2 65 73 1 80 E72 72 2 86 6 94 7 110 575 3 60 9 78 14 1 6 5 2 0 NONE 28 7 35 E18 18 1 17 3 50 3 60 E36 36 2 34 6 50 3 6...

Page 18: ...4 2 129 9 158 7 175 E72 72 2 173 2 202 225 460 3 60 12 2 100 19 2 15 6 5 5 NONE 43 3 50 E18 18 1 21 7 70 3 80 E36 36 2 43 3 70 3 80 E54 54 2 65 79 3 90 E72 72 2 86 6 101 110 575 3 60 9 78 14 1 6 5 2 4...

Page 19: ...137 6 150 E54 54 2 129 9 154 2 175 E72 72 2 173 2 197 5 225 460 3 60 12 2 100 19 2 15 9 7 0 NONE 41 5 50 E18 18 1 21 7 68 5 70 E36 36 2 43 3 68 5 70 E54 54 2 65 77 1 90 E72 72 2 86 6 98 7 110 575 3 60...

Page 20: ...50 E54 54 2 129 9 166 7 175 E72 72 2 173 2 210 225 460 3 60 12 2 100 19 2 15 9 7 5 NONE 46 5 50 E18 18 1 21 7 73 5 80 E36 36 2 43 3 73 5 80 E54 54 2 65 83 3 90 E72 72 2 86 6 105 110 575 3 60 9 78 14 1...

Page 21: ...Capacity Btu hr 99 000 136 000 System power KW COP 13 62 2 05 20 96 2 05 DIMENSIONS inches Length 136 1 4 180 19 32 Width 92 92 Height 52 5 8 52 5 8 OPERATING WT lbs 2140 2650 COMPRESSORS Type Scroll...

Page 22: ...drive the economizer including minimum position free cooling economizer loading and minimum outdoor air supply Economizer Minimum Position The economizer minimum position is set during occupied mode w...

Page 23: ...modulate to control the supply air temperature to the Economizer Setpoint If the supply air temperature cannot be maintained within 5 F of the economizer setpoint the first stage compressor C1 will b...

Page 24: ...ation Operation details include a Compares economizer output to the Economizer Damper Position For Exhaust Fan On and OFF b Energizes exhaust fan when economizer output is above Economizer Damper Posi...

Page 25: ...mistor MAT parameter reports input status F C 3 65 VDC reading MAT to COM with open circuit Read only use in current control revision IN1 MAT LEDs at left on upper edge of economizer board POWER POWER...

Page 26: ...power exhaust actuator and economizer actuator Connects through circuit trace to 24V IN pin HOT ECON 2 10 VDC output for the Economizer actuator Econ parameter reports output status 0 100 Used to posi...

Page 27: ...negative for the indoor air quality sensor Connects through circuit trace to 24V IN pin COM R 24V 24 VAC hot supplied for the outdoor air quality sensor Connects through circuit trace to 24V IN pin HO...

Page 28: ...panel from the unit Loosen but do not remove the two panel latches Locate the economizer actuator where the following adjustment can be made With power exhaust option each building pressurization req...

Page 29: ...creases In order to use the indoor blower tables for high altitude applications certain corrections are necessary A centrifugal fan is a constant volume device This means that if the rpm remains const...

Page 30: ...iven is at an elevation of 5 000 ft The first step is to convert this static pressure to equivalent sea level conditions Sea level static pressure 1 5 832 1 80 Enter the blower table at 6000 sCFM and...

Page 31: ...5 0 HP motor The 7 5 HP motor is required 6 1020 RPM is within the range of the 7 5 HP drives 7 Using the 7 5 HP motor and drive 3 5 turns open will achieve 1020 RPM Example Supply Air Blower Performa...

Page 32: ...880 5 52 916 5 90 954 6 27 992 6 61 1030 6 94 1067 7 26 1103 7 58 7 5 HP Field Supplied Drive XA 20 20 Ton Side Duct Air Flow CFM Available External Static Pressure IWG1 1 Blower performance includes...

Page 33: ...7 49 7600 852 4 73 885 5 21 920 5 63 956 6 01 992 6 36 1027 6 68 1063 6 98 1097 7 27 1130 7 56 7 5 HP Field Supplied Drive XA 20 20 Ton Bottom Duct Air Flow CFM Available External Static Pressure IWG...

Page 34: ...e actual CFM through the unit can be determined from the curve in Pressure Drop vs Supply Air CFM Figure 19 After readings have been obtained remove the tubes and reinstall the two 5 16 dot plugs that...

Page 35: ...tment Figure 17 4 Tighten blower pulley and motor sheave set screws after any adjustments Re check set screws after 10 12 hours run time recommended Belt drive blower systems MUST be adjusted to the s...

Page 36: ...ower is energized whenever a cooling or heating operation is requested The blower is energized after any specified delay associated with the operation When energized the indoor blower has a minimum ru...

Page 37: ...it is affected by the fault as well The unit control board monitors the temperature limit switch of electric heat units Compressor Protection In addition to the external pressure switches the compress...

Page 38: ...emperature conditions must call for defrost continuously for 4 1 2 minutes before another defrost cycle is initiated A temperature inhibit feature prohibits defrost if the coil temperature is above 40...

Page 39: ...Instructions 1 Turn unit electrical power on 2 Set the room thermostat setting to lower than the room temperature 3 First stage compressors will energize after the built in time delay five minutes 4...

Page 40: ...naccurate 2 This chart is applicable to unit with the TXV s left to the factory setting If the TXV s have been adjusted in the field the charging chart may no longer apply 200 250 300 350 400 450 500...

Page 41: ...ressure grease gun pump grease Chevron SRI 2 or equivalent into the bearing cavity until new grease shows at the open port Do not over lubricate Run the motor for ten minutes until excess grease is pu...

Page 42: ...microprocessor connects through circuit trace to the SD 24 terminal SD 24 24 VAC hot out for factory accessory smoke detector condensate overflow and or user shutdown relay switching in series Connec...

Page 43: ...t indicates 24 VAC is present at C and 24V terminals FAULT Red hard lockout networking error and firmware error indicator 1 2 second on off flashing indicates one or more alarm is currently active 1 1...

Page 44: ...2 with open circuit Used in suction line temperature safety Pinned connections on right edge of UCB RAH Return Air Humidity input from 0 10 VDC 0 100 RH sensor Input required for reheat units optional...

Page 45: ...r contactor coil indoor blower VFD enable relay coil Output with heat cool operation G input or schedule demand C1 24 VAC hot output for compressor 1 If demand is present and permissions allow compres...

Page 46: ...er of the board Posi tive of the 15 VDC reading to C circuit for powering an optional netstat and or MultiTouch gateway C Common for SA BUS power and communication circuits Also incorporated in the J8...

Page 47: ...indicates the UCB is supplying power to the communication sub board 1 When wiring unit and other devices using the SA Bus and FC Bus see Table 20 Table 19 Smart Equipment UCB Details Continued Descri...

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