II549K-7-9-01 Rev B Variable Speed Heat Pump Heat Pumps Bryant Instruction Manual

*Preferred™ Series 549K07-09
Single Package Rooftop Heat Pump with Puron®
(R-410A) Refrigerant and Axion™ Fan Technology**

Installation Instructions

SAFETY CONSIDERATIONS

Improper installation, adjustment, alteration, service, maintenance, or use can cause explosion, fire, electrical shock or other conditions which may cause personal injury or property damage. Consult a qualified installer, service agency, or your distributor or branch for information or assistance. The qualified installer or agency must use factory-authorized kits or accessories when modifying this product. Refer to the individual instructions packaged with the kits or accessories when installing.
Follow all safety codes. Wear safety glasses and work gloves. Use quenching cloths for brazing operations and have a fire extinguisher available. Read these instructions thoroughly and follow all warnings or cautions attached to the unit. Consult local building codes and appropriate national electrical codes (in U.S.A., ANSI/NFPA70, National Electrical Code (NEC); in Canada, CSA C22.1) for special requirements.
It is important to recognize safety information. This is the safety-alert symbol . When you see this symbol on the unit and in instructions or manuals, be alert to the potential for personal injury.
Understand the signal words DANGER, WARNING, CAUTION, and NOTE. These words are used with the safetyalert symbol. DANGER identifies the most serious hazards which will result in severe personal injury or death.
WARNING signifies hazards which could result in personal injury or death. CAUTION is used to identify unsafe practices, which may result in minor personal injury or product and property damage. NOTE is used to highlight suggestions which will result in enhanced installation, reliability, or operation.

WARNING
Electrical shock can cause personal injury and death. Shut off all power to this equipment during installation and service. There may be more than one disconnect switch.
Tag all disconnect locations to alert others not to restore power until work is completed.
WARNING
UNIT OPERATION AND SAFETY HAZARD
Failure to follow this warning could cause personal injury, death and/or equipment damage.
R-410A refrigerant systems operate at higher pressures than standard R-22 systems. Do not use R-22 service equipment or components on R-410A refrigerant equipment.
WARNING
PERSONAL INJURY AND ENVIRONMENTAL HAZARD
Failure to follow this warning could cause personal injury or death.
Relieve pressure and recover all refrigerant before system repair or final unit disposal.
Wear safety glasses and gloves when handling refrigerants. Keep torches and other ignition sources away from refrigerants and oils.
CAUTION
PERSONAL INJURY HAZARD
Failure to follow this caution may result in personal injury.
Sheet metal parts may have sharp edges or burrs. Use care and wear appropriate protective clothing, safety glasses and gloves when handling parts and servicing air conditioning equipment.

MODEL NUMBER NOMENCLATURE AND DIMENSIONS

See Fig. 1 for 549K*07-09 model number nomenclature. See Fig. 2 and 3 (pages 4-9) for unit dimensional drawings.
Rated Indoor Airflow
Table 1 lists the rated indoor airflow used for the AHRI efficiency rating for the units covered in this document.

Table 1 — Rated Indoor Airflow

INSTALLATION

Jobsite Survey
Complete the following checks before installation.

1. Consult local building codes and the NEC (National Electrical Code) ANSI/NFPA 70 for special installation requirements.
2. Determine unit location (from project plans) or select unit location.
3. Check for possible overhead obstructions which may interfere with unit lifting or rigging.

Step 1 — Plan for Unit Location
Select a location for the unit and its support system (curb or other) that provides for minimum clearances required for safety (including clearance to combustible surfaces), unit performance and service access below, around and above unit as specified in unit  drawings. Refer to Fig. 2 on page 5 or Fig. 3 on page 8.
NOTE: Consider also the effect of adjacent units.
Unit may be installed directly on wood flooring or on Class A, B, or C roof- covering material when roof curb is used.
Do not install unit in an indoor location. Do not locate air inlets near exhaust vents or other sources of contaminated air.
Although unit is weatherproof, avoid locations that permit water from higher level runoff and overhangs to fall onto unit.
Select a unit mounting system that provides adequate height to allow installation of condensate trap per requirements. See Install External Condensate Trap and Line on page 15 for required trap dimensions.
ROOF MOUNT
Check building codes for weight distribution requirements. Unit operating weight is shown in Table 2.

Table 2 — Operating Weights

Step 2 — Plan for Sequence of Unit Installation
The support method used for this unit will dictate different sequences for the steps of unit installation. For example, on curbmounted units, some accessories must be installed on the unit before the unit is placed on the curb. Review the following for recommended sequences for installation steps.

CURB-MOUNTED INSTALLATION

1. Install curb
2. Install field-fabricated ductwork inside curb
3. Install accessory thru-base service connection package (affects curb and unit) (refer to accessory installation instructions for details)
4. Prepare bottom condensate drain connection to suit planned condensate line routing (see Install External Condensate Trap and Line on page 15 for details)
5. Rig and place unit
6. Install outdoor air hood
7. Install condensate line trap and piping
8. Make electrical connections
9. Install other accessories

PAD-MOUNTED INSTALLATION

1. Prepare pad and unit supports
2. Check and tighten the bottom condensate drain connection plug
3. Rig and place unit
4. Convert unit to side duct connection arrangement
5. Install field-fabricated ductwork at unit duct openings
6. Install outdoor air hood
7. Install condensate line trap and piping
8. Make electrical connections
9. Install other accessories

FRAME-MOUNTED INSTALLATION
Frame-mounted applications generally follow the sequence for a curb installation. Adapt as required to suit specific installation plan.

Step 3 — Inspect Unit
Inspect unit for transportation damage. File any claim with transportation agency.
Confirm before installation of unit that voltage, amperage and circuit protection requirements listed on unit data plate agree with power supply provided.
On units with hinged panel option, check to be sure all latches are snug and in closed position.
Locate the carton containing the outside air hood parts. Do not remove carton until unit has been rigged and located in final position.
Step 4 — Provide Unit Support
ROOF CURB MOUNT
Accessory roof curb details and dimensions are shown in Fig. 4 (on page 11). Assemble and install accessory roof curb in accordance with instructions shipped with the curb. Curb should be level. This is necessary for unit drain to function properly.
Unit leveling tolerances are shown in Fig. 5 (on page 12). Refer to Accessory Roof Curb Installation Instructions for additional information as required. Install insulation, cant strips, roofing felt, and counter flashing as shown. Ductwork must be attached to curb and not to the unit. The accessory thru-the- base power and gas connection package must be installed before the unit is set on the roof curb.
If electric and control wiring is to be routed through the basepan, attach the accessory thru-the-base service connections to the basepan in accordance with the accessory installation instructions.
NOTE: 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. 4. Improperly applied gasket can also result in air leaks and poor unit performance.

MAXIMUM ALLOWABLE DIFFERENCE in. (mm)

Fig. 5 — Unit Leveling Tolerances
SLAB MOUNT (HORIZONTAL UNITS ONLY)
Provide a level concrete slab that extends a minimum of 6 in.
(150 mm) beyond unit cabinet. Install a gravel apron in front of condenser coil air inlet to prevent grass and foliage from obstructing airflow.
NOTE: Horizontal units may be installed on a roof curb if required.
ALTERNATE UNIT SUPPORT (IN LIEU OF CURB OR SLAB MOUNT)
A non-combustible sleeper rail can be used in the unit curb support area. If sleeper rails cannot be used, support the long sides of the unit with a minimum of 3 equally spaced 4 in. x 4 in. (102 mm x 102 mm) pads on each side.

Step 5 — Field Fabricate Ductwork
Cabinet return-air static pressure (a negative condition) shall not exceed 0.35 in. wg (87 Pa) with economizer or 0.45 in. wg (112 Pa) without economizer.
For vertical ducted applications, secure all ducts to roof curb and building structure. Do not connect ductwork to unit.
Fabricate supply ductwork so that the cross sectional dimensions are equal to or greater than the unit supply duct opening dimensions for the first 18 in. (458 mm) of duct length from the unit basepan.
Insulate and weatherproof all external ductwork, joints, and roof openings with counter flashing and mastic in accordance with applicable codes.
Ducts passing through unconditioned spaces must be insulated and covered with a vapor barrier.
If a plenum return is used on a vertical unit, the return should be ducted through the roof deck to comply with applicable fire codes.

CAUTION
PROPERTY DAMAGE HAZARD
Failure to follow this caution may result in damage to roofing materials.
Membrane roofs can be cut by sharp sheet metal edges. Be careful when placing any sheet metal parts on such roof.
FOR UNITS WITH ACCESSORY ELECTRIC HEATERS
All installations require a minimum clearance to combustible surfaces of 1 in. (25 mm) from duct for first 12 in. (305 mm) away from unit.
Outlet grilles must not lie directly below unit discharge.

WARNING
PERSONAL INJURY HAZARD
Failure to follow this warning could cause personal injury.
For vertical supply and return units, tools or parts could drop into ductwork and cause an injury. Install a 90 degree turn in the return ductwork between the unit and the conditioned space. If a 90 degree elbow cannot be installed, then a grille of sufficient strength and density should be installed to prevent objects from falling into the conditioned space. Due to electric heater, supply duct will require 90 degree elbow.

Step 6 — Rig and Place Unit
Keep unit upright and do not drop. Spreader bars are required.
Rollers may be used to move unit across a roof. Level by using unit frame as a reference. Refer to Table 2 on page 10 and see Fig. 6 on page 13 for additional information.
Lifting holes are provided in base rails as shown in Fig. 6. Refer to rigging instructions on unit.
Rigging materials under unit (cardboard or wood to prevent base pan damage) must be removed PRIOR to placing the unit on the roof curb.
When using the standard side drain connection, ensure the red plug in the alternate bottom connection is tight. Do this before setting the unit in place. The red drain pan can be tightened with a 1/2 in. square socket drive extension. For further details see Install
External Condensate Trap and Line on page 15.
Before setting the unit onto the curb, recheck gasketing on curb.

CAUTION
UNIT DAMAGE HAZARD
Failure to follow this caution may result in equipment damage.
All panels must be in place when rigging. Unit is not designed for handling by fork truck when packaging is removed.
If using top crate as spreader bar, once unit is set, carefully lower wooden crate off building roof top to ground. Ensure that no people or obstructions are below prior to lowering the crate.

POSITIONING ON CURB
Position unit on roof curb so that the following clearances are maintained: 1/4 in. (6.4 mm) clearance between the roof curb and the base rail inside the front and back, 0.0 in. clearance between the roof curb and the base rail inside on the duct end of the unit.
This will result in the distance between the roof curb and the base rail inside on the condenser end of the unit being approximately 1/4 in. (6.4 mm).
Although unit is weatherproof, guard against water from higher level runoff and overhangs.
After unit is in position, remove rigging skids and shipping materials.

NOTE(S):

1. SPREADER BARS ARE REQUIRED. Top damage will occur if spreader bars are not used.
2. Hook rigging shackles through holes in base rail, as shown in Detail A. Holes in base rails are centered around the unit center of gravity. Use wooden top to prevent rigging straps from damaging unit.

Fig. 6 — Rigging Details
Step 7 — Convert to Horizontal and Connect Ductwork (when required)
Unit is shipped in the vertical duct configuration. Unit without factory- installed economizer or return-air smoke detector option may be field- converted to horizontal ducted configuration. To convert to horizontal configuration, remove screws from side duct opening covers (see Fig. 7) and remove covers. Use the screws to install the covers on vertical duct openings with the insulation-side down. The panels must be inserted into the notches on the basepan to properly seal. The notches are covered by the tape used to secure the insulation to the basepan and are not easily seen. See Fig. 8 for position of the notches in the basepan. Seals around duct openings must be tight. Secure with screws as shown in Fig. 9. Cover seams with foil duct tape.
Field-supplied flanges should be attached to horizontal duct openings and all ductwork should be secured to the flanges. Insulate and weatherproof all external ductwork, joints, and roof or building openings with counter flashing and mastic in accordance with applicable codes.
Do not cover or obscure visibility to the unit’s informative data plate when insulating horizontal ductwork.

Step 8 — Install Outside Air Hood
ECONOMIZER HOOD PACKAGE REMOVAL (FACTORY OPTION)

1. The hood is shipped in knock-down form and must be field assembled. The indoor coil access panel is used as the hood top while the hood sides, divider and filter are packaged together, attached to a metal support tray using plastic stretch wrap, and shipped in the return air compartment behind the indoor coil access panel.
   The hood assembly’s metal tray is attached to the basepan and also attached to the damper using two plastic tie-wraps.

2. To gain access to the hood, remove the filter access panel. (See Fig. 10.)

3. Locate the (2) screws holding the metal tray to the basepan and remove. Locate and cut the (2) plastic tie-wraps securing the assembly to the damper. (See Fig. 11.) Be careful to not damage any wiring or cut tie-wraps securing any wiring.

4. Carefully lift the hood assembly (with metal tray) through the filter access opening and assemble per the steps outlined in Economizer Hood Setup in the following section.

ECONOMIZER HOOD SETUP
NOTE : If the power exhaust accessory is to be installed on the unit, the hood shipped with the unit will not be used and must be discarded. Save the aluminum filter for use in the power exhaust hood assembly.

1. The indoor coil access panel will be used as the top of the hood. Remove the screws along the sides and bottom of the indoor coil access panel. See Fig. 12.
2. Swing out indoor coil access panel and insert the hood sides under the panel (hood top). Use the screws provided to attach the hood sides to the hood top. Use screws provided to attach the hood sides to the unit. See Fig. 13.
3. Remove the shipping tape holding the economizer barometric relief damper in place (economizer only).
4. Insert the hood divider between the hood sides. See Fig. 13 and 14. Secure hood divider with 2 screws on each hood side. The hood divider is also used as the bottom filter rack for the aluminum filter.
5. Open the filter clips which are located underneath the hood top. Insert the aluminum filter into the bottom filter rack (hood divider). Push the filter into position past the open filter clips. Close the filter clips to lock the filter into place. See Fig. 14.
6. Caulk the ends of the joint between the unit top panel and the hood top.
7. Replace the filter access panel.

Step 9 — Install External Condensate Trap and Line
The unit has one 3/4 in. condensate drain connection on the end of the condensate pan and an alternate connection on the bottom. See Fig. 15. Unit airflow configuration does not determine which drain connection to use. Either drain connection can be used  with vertical or horizontal applications.

To use the alternate bottom drain connection, remove the red drain plug from the bottom connection (use a 1/2 in. square socket drive extension) and install it in the side drain connection.
The piping for the condensate drain and external trap can be completed after the unit is in place. See Fig. 16.
NOTE: If the alternate bottom drain is not used check the drain plug for tightness prior to setting the unit on the roof curb.

All units must have an external trap for condensate drainage. Install a trap at least 4 in. (102 mm) deep and protect against freezeup.
If drain line is installed downstream from the external trap, pitch the line away from the unit at 1 in. per 10 ft (25 mm in 3 m) of run. Do not use a pipe size smaller than the unit connection (3/ 4in.).

Step 10 — Make Electrical Connections

WARNING
ELECTRIC SHOCK HAZARD
Failure to follow this warning could result in personal injury or death.
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; ANSI/ NFPA 70, latest edition (in Canada, Canadian Electrical Code CSA [Canadian Standards Association] C22.1), and local electrical codes.

NOTE: Field-supplied wiring shall conform with the limitations of minimum 63°F (33°C) rise.
FIELD POWER SUPPLY
If equipped with optional powered convenience outlet: The power source leads to the convenience outlet’s transformer primary are not factory connected. Installer must connect these leads according to required operation of the convenience outlet. If an  alwaysenergized convenience outlet operation is desired, connect the source leads to the line side of the unit-mounted disconnect. (Check with local codes to ensure this method is acceptable in your area.) If a de-energize via unit disconnect switch operation of the convenience outlet is desired, connect the source leads to the load side of the unit disconnect. On a unit without a unit-mounted disconnect, connect the source leads to compressor contactor C and indoor fan contactor IFC pressure lugs with unit field power leads (see Fig. 17).
Field power wires will be connected at the line-side pressure lugs on the power terminal block or at factory-installed option non- fused disconnect.

FIELD POWER WIRING CONNECTIONS
Field power wires are connected to the unit at line-side pressure lugs on compressor contactor C and indoor fan contactor IFC (see wiring diagram label for control box component arrangement), or at factory-installed option non- fused disconnect switch or electric heat single point box. Maximum wire size is no. 4ga AWG (copper only) per pole on contactors, no. 4ga AWG (copper only) or 1/0 AWG (copper only) per pole on optional disconnect (maximum wire size depends on the dis- connect size supplied with unit), and 4/0 AWG (copper only) per pole on terminal or fuse block on units with single point box. Refer to Fig. 17 and unit label diagram for field power wiring connections.
Refer to Table 3 for maximum wire sizes at connection lugs Use copper wire only. See Fig. 17 and 18.
NOTE: TEST LEADS — Unit may be equipped with short leads (pigtails) on the field line connection points on contactor C or optional disconnect switch. These leads are for factory run-test purposes only; remove and discard before connecting field power wires to unit connection points. Make field power connections directly to line connection pressure lugs only.

WARNING
FIRE HAZARD
Failure to follow this warning could result in personal injury, death, or property damage.
Do not connect aluminum wire between disconnect switch and unit. Use only copper wire.

Table 3 — Connection Lug Minimum/Maximum Wire Sizes

UNITS WITH FACTORY-INSTALLED NON-FUSED DISCONNECT
The factory-installed option non-fused disconnect (NFD) switch (see Fig. 19) is located in a weatherproof enclosure located under the main control box. The manual switch handle and shaft are shipped in the disconnect enclosure. Assemble the shaft and handle to the switch at this point. Discard the factory test leads (see Fig. 17).
Connect field power supply conductors to LINE side terminals when the switch enclosure cover is removed to attach the handle. Connect field power supply conductors to LINE side terminals when the switch enclosure cover is removed to attach the handle.

To field install the NFD shaft and handle (see Fig. 20):

1. Remove the unit front panel (refer to Fig. 2 and 3).
2. Remove (3) hex screws on the NFD enclosure — (2) on the face of the cover and (1) on the left side cover.
3. Remove the front cover of the NFD enclosure.
4. Make sure the NFD shipped from the factory is at OFF posi- tion (the arrow on the black handle knob is at OFF).
5. Insert the shaft with the cross pin on the top of the shaft in the horizontal position.
6. Measure from the tip of the shaft to the top surface of the black pointer; the measurement should be 3.75 in. to 3.88 in. (95mm to 99mm).
7. Tighten the locking screw to secure the shaft to the NFD.
8. Turn the handle to the OFF position with red arrow pointing to OFF.
9. Install the handle on to the painted cover horizontally with the red arrow pointing to the left.
10. Secure the handle to the painted cover with (2) screws and lock washers supplied.
11. Engaging the shaft into the handle socket, re-install (3) hex screws on the NFD enclosure.
12.  Re-install the unit front panel.

UNITS WITHOUT FACTORY-INSTALLED NON-FUSED DISCONNECT
When installing units, provide a disconnect switch per NEC (National Electrical Code) of adequate size. Disconnect sizing data is provided on the unit informative plate. Locate on unit cabinet or within sight of the unit per national or local codes.
Do not cover unit informative plate if mounting the disconnect on the unit cabinet.
FIELD WIRING COMPLIANCE
All field wiring must comply with NEC and all local code requirements. Size wire based on MCA (Minimum Circuit Amps) on the unit informative plate. Refer to Fig. 17 and unit label diagram for power wiring connections to the unit and equipment ground. Maximum wire size is no. 4 ga AWG (copper only) per pole on contactors and no. 2ga AWG (copper only) per pole on optional non-fused disconnect.
Provide a ground-fault and short-circuit over-current protection device (fuse or breaker) per NEC Article 440 (or local codes). Refer to unit informative data plate for MOCP (Maximum Overcurrent Protection) device size.
All units except 208/230-v units are factory wired for the voltage shown on the nameplate. If the 208/230-v unit is to be connected to a 208-v power supply, the control transformer must be rewired by moving the black wire with the 1/4 in. female spade connector from the 230-v connection and moving it to the 200-v 1/4 in. male terminal on the primary side of the transformer. Refer to unit label diagram for additional information.
Voltage to compressor terminals during operation must be within voltage range indicated on unit nameplate. On 3-phase units, voltages between phases must be balanced within 2% and the current within 10%. Use the following formula 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 Bryant warranty.

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

CONVENIENCE OUTLETS

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

WARNING
ELECTRICAL OPERATION HAZARD
Failure to follow this warning could result in personal injury or death.
Units with convenience outlet circuits may use multiple disconnects. Check convenience outlet for power status before opening unit for service. Locate its disconnect switch, if appropriate, and open it. Lock-out and tag-out this switch, if necessary.

Two types of convenience outlets are offered on 549K models: non-powered and unit-powered. Both types provide a 125-v GFCI (ground-fault circuit- interrupter) duplex receptacle rated at 15-A behind a hinged waterproof access cover, located on the end panel of the unit. See Fig. 21.
Installing Weatherproof Cover
A weatherproof cover is now required by UL standards for the factory-installed convenience outlets. This cover cannot be factory-mounted due to its depth; it must be installed at unit installation. For shipment, the convenience outlet is covered with a blank cover plate.

On units with electro-mechanical controls the weatherproof cover kit is shipped in the unit’s control box. The kit includes the hinged cover, a backing plate and gasket.
Disconnect All Power To Unit and Convenience Outlet.
Lock-Out and Tag-Out All Power Remove the blank cover plate at the convenience outlet; discard the blank cover.
Loosen the two screws at the GFCI duplex outlet, until approximately 1/2 in. (13 mm) under screw heads is exposed. Press the gasket over the screw heads.
Slip the backing plate over the screw heads at the keyhole slots and align with the gasket; tighten the two screws until snug (do not over-tighten).
Mount the weatherproof cover to the backing plate as shown in Fig. 22. Remove two slot fillers in the bottom of the cover to permit service tool cords to exit the cover. Check for full closing and latching.

Non-powered type
Requires the field installation of a general-purpose 125-v 15-A circuit powered from a source elsewhere in the building. Observe national and local codes when selecting wire size, fuse or breaker requirements and disconnect switch size and location. Route 125-v power supply conductors into the bottom of the utility box containing the duplex receptacle.
Unit-powered type
A unit-mounted transformer is factory-installed to step-down the main power supply voltage to the unit to 115-v at the duplex receptacle. This option also includes a manual switch with fuse, located in a utility box and mounted on a bracket behind the convenience outlet; access is through the unit’s control box access panel. See Fig. 21.
The primary leads to the convenience outlet transformer are not factory- connected. Selection of primary power source is a customer option.
If local codes permit, the transformer primary leads can be connected at the line-side terminals on the unitmounted non-fused disconnect; this will provide service power to the unit when the unit disconnect witch is open. Other connection methods will result in the convenience outlet circuit being de- energized when the unit disconnect switch is open. See Fig 23. On a unit without a unit-mounted disconnect, connect the source leads to the main terminal block (TB1).

ALL UNITS
Test the GFCI receptacle by pressing the TEST button on the face of the receptacle to trip and open the receptacle. Check for proper grounding wires and power line phasing if the GFCI receptacle does not trip as required. Press the RESET button to clear the tripped condition.
Unit-mounted convenience outlets
Outlets will often require that two disconnects be opened to de-energize all power to the unit. Treat all units as electrically energized until the convenience outlet power is also checked and de-energization is confirmed. Observe National Electrical Code Article 210, Branch Circuits, for use of convenience outlets.
Fuse on power type
The factory fuse is a Bussmann™1  “Fusetron” T-15, nonrenewable screw-in (Edison base) type plug fuse. See Fig. 24 for maximum continuous use amp limitations.

UNIT VOLTAGE| CONNECT AS| PRIMARY CONNECTIONS| TRANSFORMER TERMINALS
---|---|---|---
208, 230| 240| L1: RED+YEL L2: BLU+YEL| H1+H3 H2+H4
460| 480| L1: RED
Splice BLU+YEL L2: GRA| H1 H2+H3 H4
575| 600| L1: RED L2: GRA| H1 H2

Fig. 23 — Powered Convenience Outlet Wiring

1. Third-party trademarks and logos are the property of their respective owners.

FACTORY-OPTION THRU-BASE CONNECTIONS

This service connection kit consists of a a 1/2 in. electrical bulkhead connector and a 3/4 in. electrical bulkhead connector, factory-installed in the embossed (raised) section of the unit basepan in the condenser section. The 3/4 in. bulkhead connector enables the low-voltage control wires to pass through the basepan. The 1/2 in. electrical bulkhead connector allows the high-voltage power wires to pass through the basepan. See Fig. 25.

Check tightness of connector lock nuts before connecting electrical conduits.
Field-supplied and field-installed liquid tight conduit connectors and conduit may be attached to the connectors on the basepan. Pull correctly rated high voltage through appropriate conduits. Connect the power conduit to the internal disconnect (if unit is so
equipped) or to the external disconnect (through unit side panel).
A hole must be field cut in the main control box bottom on the left side so the 24-v control connections can be made. Connect the control power conduit to the unit control box at this hole.

Units Without Thru- Base Connections

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

2. Install power lines to terminal connections as shown in Fig. 23.

Voltage to compressor terminals during operation must be within voltage range indicated on unit nameplate. On 3-phase units, voltages between phases must be balanced within 2% and the current within 10%. Use the formula on page 17 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 Bryant warranty.

Field Control Wiring
The 549K unit requires an external temperature control device.
This device can be a thermostat (field-supplied) or a thermostat emulation device provided as part of a third-party Building Management System All field added wire must comply with UL and local NEC standards. Use raceway shown in Fig. 26 to help with compliance as needed.
All low voltage wiring should be routed through the provided raceway (see Fig. 26) built into the corner post of the unit or secured to the unit control box with electrical conduit in order to provide UL-required clearance between high-voltage and lowvoltage wiring.

Thermostat
Install a Bryant-approved accessory 2-stage thermostat according to installation instructions included with the accessory. For complete economizer function and 2-stage compressor operation, select a two-stage cooling thermostat. If a 2-stage cooling thermostat is not available, use a single stage cooling thermostat instead, but note that this will limit cooling to just 1 stage. Locate the thermostat accessory on a solid wall in the conditioned space to sense average temperature in accordance with the thermostat installation instructions. If the thermostat contains a logic circuit requiring 24-v power, use a thermostat cable or equivalent single leads of different colors with minimum of seven leads (see Fig. 27). If the thermostat does not require a 24-v source (no “C” connection required), use a thermostat cable or equivalent with minimum of six leads. Check the thermostat installation instructions for additional features which might require additional conductors in the cable. For wire runs up to 50 ft (15 m), use no. 18 AWG (American Wire Gauge) insulated wire [35°C (95°F) minimum]. For 50 to 75 ft (15 to 23 m), use no. 16 AWG insulated wire [35°C (95°F) minimum]. For over 75 ft (23 m), use no. 14 AWG insulated wire [35°C (95°F) minimum]. All wire sizes larger than no. 18 AWG cannot be directly connected to the thermostat and will require a junction box and splice at the thermostat.

Unit Without Thru-Base Connection Kit
Pass the thermostat control wires through the hole provided in the corner post; then feed the wires through the raceway built into the corner post to the control box. Pull the wires over to the terminal strip on the upper-left corner of the Controls Connection Board.  See Fig. 26.
NOTE: If thru-the-bottom connections accessory is used, refer to the accessory installation instructions for information on routing power and control wiring.

COMMERCIAL DEFROST CONTROL

On 549K units equipped with electro-mechanical controls the De- frost Control Board (DFB) coordinates thermostat demands for supply fan control, 1 or 2 stage cooling, 2 stage heating, emergency heating and defrost control with unit operating sequences. The DFB also provides an indoor fan off delay feature (user selectable). See Fig. 28 for board arrangement.
The DFB is located in the main control box of the 549K unit (see Fig. 29). All connections are factory-made through harnesses to the UCB (unit control board) to the ECM (direct-drive motor), reversing valve solenoids and to defrost thermostats.
See Table 4 for details of DFB Inputs and Outputs.

Table 4 — 549K Defrost Board I/O and Jumper Configurations a,b

POINT NAME| TYPE OF I/O| CONNECTION PIN NUMBER| UNIT CONNECTION| NOTE
---|---|---|---|---

INPUTS

G Fan| DI, 24 vac| P2-3| CTB-G|
---|---|---|---|---
Y1 Cool 1| DI, 24 vac| P2-5| CTB-Y1|
Y2 Cool 2| DI, 24 vac| P2-4| CTB-Y2|
W1 Heat 1| DI, 24 vac| P2-7| CTB-W1|
W2 Heat 2| DI, 24 vac| P2-6| CTB-W2|
R Power| 24 vac| P3-1| CONTL BRD-8|
C Common| 24 vac| P3-2| CONTL BRD-4|
DFT 1| DI, 24 vac| DFT-1 to DFT-1| —|
DFT 2| DI, 24 vac| DFT-2 to DFT-2| —|

OUTPUTS

IFO Fan On| DO, 24 vac| P3-9| REHEAT/HP-2|
---|---|---|---|---
OF OD Fan On| DO, 24 vac| OF| OFR|
RVS1| DO, 24 vac| P3-7 to P3-5| —| Energize in COOL
RVS2| DO, 24 vac| P3-6 to P3-4| —| Energize in COOL
COMP 1| DO, 24 vac| P3-10| FPT1-REHEAT/HP-6|
COMP2| DO, 24 vac| P3-8| FPT2-REHEAT/HP-8|
HEAT 2| DO, 24 vac| E-HEAT| TB4-1|
COM| 24 vac| P3-3| TB4-3|

CONFIGURATION

Select Jumper| 24 vac| P1-1| —|
---|---|---|---|---

SPEED-UP CONFIGURATION

Speed-Up Jumper| —| JMP17| —|
---|---|---|---|---
Speed-Up Jumper| —| JMP18| —|

NOTE(S):
a. Jumper for 1-3 seconds: Factory Test — The defrost interval timing is reduced by a factor of 0.1 seconds/minute based on the positions of DIP switches SW1 and SW2 (i.e., 90 minutes will be reduced to 9 seconds).
b. Jumper for 5-20 seconds: Forced Defrost — Defrost runs for 30 seconds if DFT2 is open.

Reversing Valve Control
The DFB has two outputs for unit reversing valve control. Opera- tion of the reversing valves is based on internal logic; this application does not use an “O” or “B” signal to determine reversing valve position. Reversing valves are energized during the cooling stages and the defrost cycle and de-energized during heating cycles. Once energized at the start of a cooling stage, the reversing valve will remain energized until the next heating cycle demand is received. Once de-energized at the start of a Heating cycle, the reversing valves will remain de-energized until the next cooling stage is initiated.

Compressor Control
The DFB receives inputs indicating Stage 1 Cooling, Stage 2 Cooling and Stage 1 Heating from the space thermostat or thermostat emulation device (provided as part of a third-party Building Management System); it generates commands to start compressors with or without reversing valve operation to produce Stage 1 Cooling (one compressor runs), Stage 2 Cooling (both compressors run) or Stage 1 Heating (both compressors run).

Auxiliary (Electric) Heat Control
The 549K unit can be equipped with one or two auxiliary electric heaters, to provide a second stage of heating. The DFB will energize this Heating System for a Stage 2 Heating Command (heaters operate concurrently with compressor(s) in the Stage 1 Heating cycle), for an Emergency Heating sequence (compressors are off and only the electric heaters are energized) and also during the Defrost cycle (to eliminate a “cold blow” condition in the space).

Defrost
The defrost control mode is a time/temperature sequence. There are two time components: The continuous run period and the test/ defrost cycle period. The temperature component is provided by Defrost Thermostat 1 and 2 (DFT1 and DFT2) mounted on the outdoor coil.
The continuous run period is a fixed time period between the end of the last defrost cycle (or start of the current Heating cycle) during which no defrost will be permitted. This period can be set at 30, 60, 90 or 120 minutes by changing the positions of DIP  switches SW1 and SW2 (see Fig. 30 and Table 5). The default run period is 30 minutes.

Shorting the jumpers for a period of 5 to 20 seconds bypasses the remaining continuous run period and places the unit in a Forced Defrost mode. If the controlling DFT is closed when this mode is initiated, the unit will complete a normal defrost period that will
terminate when the controlling DFT opens or the 10 minute defrost cycle limit is reached. If the controlling DFT is open when this mode is initiated, the Defrost cycle will run for 30 seconds. Both modes end at the end of the Defrost cycle.

HEAT ANTICIPATOR SETTINGS

Set heat anticipator settings at 0.14 amp for the first stage and 0.14 amp for second-stage heating, when available.
ELECTRIC HEATERS
The 549K units may be equipped with field-installed accessory electric heaters. The heaters are modular in design, with heater frames holding open coil resistance wires strung through ceramic insulators, line-break limit switches and a control contactor.
Heater modules are installed in the compartment below the indoor (supply) fan outlet. Access is through the indoor access panel. See Fig. 31-33.
Not all available heater modules may be used in every unit. Use only those heater modules that are UL listed for use in a specific size unit. Refer to the label on the unit cabinet for the list of approved heaters.
Refer to the Small Roof Top Units Accessory Electric Heater and Single Point Box installation instructions for further details.

Table 5 — DIP Switch Positions

| 1| 2| | 1| 2| | 1| 2| | 1| 2| | 3|
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---
1| •| | 1| | •| 1| | | 1| •| •| 1| •| On
0| | •| 0| •| | 0| •| •| 0| | | 0| | Off
| 30 minutes (factory default)| | 60 minutes| | 90 minutes| | 120 minutes| | Fan Delay|

SINGLE POINT BOXES AND SUPPLEMENTARY FUSES
When the unit MOCP device value exceeds 60-A, unit-mounted supplementary fuses are required for each heater circuit. These fuses are included in accessory single point boxes, with power distribution and fuse blocks. The single point box will be installed directly under the unit control box, just to the left of the partition separating the indoor section (with electric heaters) from the outdoor section. The single point box has a hinged access cover. Refer to Fig. 34. The single point box also includes a set of power taps and pigtails to complete the wiring between the single point box and the unit’s main control box terminals. Refer to the Small Roof Top Units Accessory Electric Heater and single point box installation instructions for details on tap connections. All fuses on 549K units are 60-A. (Note that all heaters are qualified for use with a 60-A fuse, regardless of actual heater ampacity, so only 60-A fuses are necessary.)

SINGLE POINT BOXES WITHOUT FUSES
Unit heater applications not requiring supplemental fuses require a special single point box without any fuses. The accessory single point boxes contain a set of power taps and pigtails to complete the wiring between the single point box and the unit’s main control box terminals. Refer to accessory heater and single point box installation instructions for details on tap connections.
LOW-VOLTAGE CONTROL CONNECTIONS
Pull the low-voltage control leads from the heater module — WHT, VIO and BRN to the 4-pole terminal board TB4 located on the heater bulkhead to the left of the Heater module. Connect the WHT lead from Heater circuit no. 1 to terminal TB4-1. For 2 stage heating, connect the VIO lead from Heater circuit no. 2 to terminal TB4-2. Connect the BRN lead(s) to terminal TB4-3. See Fig. 35.

CONTROL AND POWER WIRING DIAGRAMS

Figures 36-39 are typical control and power wiring diagrams.

EconomizerONE (Factory Option)
ECONOMIZER SETTINGS
Interface Overview
EconomizerONE
This option consists of the following:

• Low Leak Economizer Assembly
• HH79NZ039 OA (Outdoor Air) Dry Bulb Sensor
• HH79NZ039 Mixed Air Sensor
• POL224 Controller
• 48TC005897 Harness

POL224 Economizer Module Wiring
The economizer controller used on electromechanical units is a Siemens POL224, which is to be located in the RTU base unit’s control box. See Fig. 40 for button description of the POL224 controller.
Refer to the unit dimensional drawing for the location of the control box access panel.
The POL224 controller provides the following:

1. One-line LCD (Liquid Crystal Display) — After a period of inactivity, the controller displays the default HMI (Human Machine Interface) screen (free cooling status, 1FREE-COOL YES or 1FREE COOL NO). See Fig. 40-44.
2. Operation button (Up button) — Move to the previous value, step, or category.
3. Operation button (Down Button) — Move to the next value, step, or category.
4. Operation Button (Enter Button):
   a. Press Enter to edit the current value or option.
   b. Press Enter to confirm a newly selected value or option.
   c. Press Enter + Up to jump up one entire category.
   d. Press Enter + Down to jump down one entire category.

User Interface and Keypad
The controller user interface consists of an LCD display and a 3-button keypad for input. The LCD is a 16 character by 1-line dot matrix display. The keypad is used to navigate and change the desired menu items on the display. See Fig. 40.
The Climatix™1  mobile application allows for installation, commissioning, and servicing. Scanning a QR code on the controller allows users to download the mobile application on Android™1 or Apple iOS®1  , but a Wi-Fi/WLAN stick is needed.  See Fig. 40 and 41. Plug Wi-Fi/WLAN stick into controller USB port for temporary connection for mobile application setup. The Wi-Fi/WLAN stick can be used for multiple units.
Menu Structure
Menus are displayed in the economizer controller via categories.
There are eight first-level menus, each of which is represented by a number at the beginning of the line on the LCD. Pressing Enter + Up or Down can toggle between different first-level menus. Submenus follow the numbered first-level menus closely. Pressing Up or Down can toggle between different submenus.
At the end of the line, the LCD displays the value of the current submenu (if any). If the value is editable, pressing Enter will put the terminal in Edit mode. The value is then highlighted for change. After making a change by pressing Up or Down, press Enter to confirm the change and exit the Edit mode. See Fig. 43.
Powering the Economizer Controller
The POL224 controller power connections are made through the economizer harness (P/N 48TC005897). Connections from the harness are made to the C (24 vac common) and R (24 vac power) terminals of the economizer controller. See Fig. 42.
LED Indication
NOTE: If different faulty events occur at the same time, then sensor/DAC LED lights up following the priority below: Red → Yellow →Off. For example, if there is a humidity sensor error and air temperature failure at the same time, then the sensor LED turns red rather than yellow. See Fig. 44 and Table 6.
IMPORTANT: After the Economizer controller enters the running state, it may take one minute for peripheral devices to complete initialization. Before that, LED indication might be unstable.

NOTE: QR codes in this image are for reference only.

the default: HMI screen (free cooling status, 1FREECOOL YES or 1FREECOOL NO)
4| Operation button (Up button) – Move to the previous value, step or category.
5| Operation button (Down button) – Move to the next value, step or category.
6| Operation button (Enter button):
• Press to edit the current value or option.
• Press to confirm a newly selected value or option.
• Press Enter + Up to jump up one entire category.
• Press Enter + Down to jump down one entire category.

Fig. 40 — POL224 Controller

numbers represent different menus:
1: Status Display
2: Basic Settings
3: Advanced Settings
4: Alarms
5: Enter Configuration State and Reset 6: I/O Config
7: Testing
8: Enter Running State
2| Submenu
3| Value of the current submenu

*See “Setup and Configuration” on page 38 for detailed submenus together with possible values or ranges.
Fig. 43 — Menu Structure Descriptions

Fig. 44 — LED Indication
Table 6 — LED Indication

Functions

Free Cooling Economizing
Free cooling uses unconditioned outside air to cool the space directly. The economizer controller enables or disables free cooling after it judges which control mode is active. It also uses hysteresis to ensure a smooth switchover.
Depending on the sensors that are used, there are four different control modes. In different control modes, the assessed conditions are different. See Table 7.
Default Hysteresis Setting
Hysteresis setting (DB) defaults to 2°F (–17°C). See Fig. 45.

Table 7 — Free Cooling Functions

Control Mode 1
• Fixed Dry bulb| OA (outside air) temperature sensor and MA (Mixed Air) temperature sensor| The outside air dry bulb temperature is compared with the set temperature shutoff setpoint.
If the outside air dry bulb temperature is below the temperature shutoff setpoint, then the outside air is used to meet all or part of the cooling demand.
Control Mode 2
• Differential Dry bulb (Dual Dry bulbs)| OA temperature sensor, RA (Return Air) temperature sensor and MA temperature sensor| The outside-air dry bulb temperature is compared with the return air dry bulb temperature.
If both OAT and RAT are higher than the temperature high limitation, then free cooling is prohibited.
If OAT or RAT is lower than the temperature high limitation and the outside air dry bulb temperature is lower than the return air dry-bulb temperature, then the outside air is used to meet all or part of the cooling demand.
Control Mode 3
• Combination Fixed Enthalpy and Fixed Dry bulb Control| OA temperature and humidity sensor, and MA temperature sensor| The outside air dry bulb temperature and enthalpy are compared with the set temperature and enthalpy shutoff setpoints.
If the outside air enthalpy is lower than the set enthalpy shutoff setpoint, and the outside air dry bulb temperature is lower than the temperature shutoff setpoint, then the outside air can be used for economizing.
Control Mode 4
• Combination of Differential Enthalpy and Fixed Dry bulb| OA temperature and humidity sensor, RA temperature and humidity sensor, and MA temperature sensor| The outside air dry bulb temperature and enthalpy are compared with the temperature shutoff setpoint and return air enthalpy.
If both OA enthalpy and RA enthalpy are higher than the enthalpy high limitation, then free cooling is prohibited.
If OA enthalpy or RA enthalpy is lower than the enthalpy high limitation, outside air enthalpy is lower than the return-air enthalpy, and the outside air dry bulb temperature is lower than the set temperature shutoff setpoint, then outside air can be used for economizing.

Damper Modulation During Free Cooling
Once outside air is suitable for free cooling, the controller modulates the damper based on MAT (mixed air temperature, default) or OAT (outside air temperature). Refer to Table 7.
If MAT is used when free cooling is enabled, MAT setpoint (3MAT SET, configurable in “Parameter Settings — Advanced” on page 41) is used for MAT modulating. When MAT falls below the anti-freeze setpoint (3FRZ PROT), the damper either fully closes or opens to the minimum position (configurable in “Parameter Settings — Advanced” on page 41).

1. If MAT is lower than MAT setpoint, then the damper is modulated to maintain MAT setpoint, towards fully closed or open to the minimum position based on occupancy status if MAT continues dropping.
2. If MAT is in the range [MAT setpoint, (MAT setpoint + neutral zone band [1°F by default])], then the damper position does not change.
3. If MAT is higher than (MAT setpoint + neutral zone band), then the damper opens towards fully open.
4. If MAT is 10°F higher than MAT setpoint, then the damper fully opens to 100%.

If OAT is used when there is a cooling demand, the damper can be opened to different positions depending on different outside air temperatures:

1. If outside air is higher than 50°F but lower than the temperature shutoff setpoint, then the damper is fully open.
2. If outside air is higher than OAT lockout setpoint but lower than 50°F, then linear modulation is applied when only Cooling Stage 1 input (Y1I) is ON. Result of the following formula indicates the damper’s open position:
   ([OAT – OAT Lockout Setpoint] / [50 – OAT Lockout Setpoint]) * (80% – MIN POS)

• MIN POS
  NOTE: When both free cooling and mechanical cooling are on, damper remains fully open regardless of the modulating logic.

Location-Based Shutoff Setpoints
The economizer controller can get location-based temperature and enthalpy shutoff setpoints automatically if it is connected to the Climatix™ mobile application. Once a Wi-Fi/WLAN stick is plugged in, the economizer controller can establish network  connection with the mobile application. The temperature and enthalpy shutoff setpoints obtained via the phone or tablet’s GPS functionality can then be synchronized to the economizer controller.

Cooling Stage Operation
The economizer controller accepts inputs for 1 and 2-stage cooling inputs and reroutes to the RTU through the relay connection Y1 and Y2.
The operation of the cooling stages is determined by the availability of Free Cooling provided by the economizer operation mode. See Cooling Stage I/O Logic Tables 8-9. Based on the use of Free Cooling, the operating modes are as follows:

• Y1 is Stage 1 Cooling Demand.
• Y2 is Stage 2 Cooling Demand.
• Free Cooling is always the first cooling stage.
• Cooling Stage 1 call from the Commercial Thermostat (Y1) energizes the Y1 input to the economizer controller.
• Cooling Stage 2 call from the Commercial Thermostat (Y2) energizes the Y2 input to the economizer controller.

Table 8 — 1 and 2-Stage Cooling Stage I/O Logic

ECONOMIZER CONDITION MET| Y1| Y2| COOLING STAGE 1| COOLING STAGE 2
---|---|---|---|---
NO| On| On| On| On
NO| On| Off| On| Off
NO| Off| Off| Off| Off
YES| On| On| On| On/Offa
YES| On| Off| Off| Off
YES| Off| Off| Off| Off

NOTE(S):
a. If OAT ≤ MAT setpoint (3MAT SET), then Relay 2 is always OFF to disable Cooling Stage 2. Otherwise, if both stages of cooling (Y1 and Y2) are ON for more than a set time (15 minutes by default), Y2 remains ON, and the OAT is higher than MAT setpoint,  then Relay 2 energizes to allow Y2 pass-through to enable Cooling Stage 2.

Table 9 — 2-Stage Cooling Stage I/O Logic

ECONOMIZER CONDITION MET| Y1| Y2| COOLING STAGE 1| COOLING STAGE 2
---|---|---|---|---
NO| On| On| On| On
NO| On| On| On| On
NO| On| Off| On| Off
NO| Off| Off| Off| Off
YES| On| On| On| On
YES| On| On| On| On/Off
YES| On| Off| Off| Off
YES| Off| Off| Off| Off

IMPORTANT: The economizer controller can tolerate thermostat wiring mismatch, e.g. Thermostat Y1→ Economizer Y2-In, Thermostat Y2 → Economizer Y1-In.
The handling logic is Stage =Y1I + Y2I. For example, Y1O =1 if Stage > =1, Y2O =1 if Stage > = 2.

Multi-Speed Fan Support
The economizer controller supports connection to 2-speed fans.
When the unit is equipped with a multi-speed fan, the damper responds to multiple fan speeds via multiple minimum positions (MIN POS) to keep minimum airflow. See Tables 10-12.

Table 10 — Damper MIN POS for 2-Speed Fan a

Y1| Y2| W1 OR O/B| SPD L| SPD H| POS L| POS H
---|---|---|---|---|---|---
X| —| —| X| —| X| —
X| X| —| —| X| —| X
—| —| X| —| X| —| X

NOTE(S):
a. A multi-speed fan is not controlled by the economizer controller but by an external logic board.
LEGEND
POS L — Damper MIN POS for Low-Speed Fan
POS H — Damper MIN POS for High-Speed Fan
SPD L — Low-Speed (Fan)
SPD H — High-Speed (Fan)

Table 11 — Different Fan Speeds with Different Configured Outputs a

(regardless of cooling demand, OCC=Yes)
2-SPEED FANc| • Spd L (0 or 1 cooling demand)
• Spd H (2 cooling demands)| •  Spd L (0 or 1 cooling demand)
• Spd H (2 cooling demands)

NOTE(S):
a. If a single-speed fan connects to the Controller, it opens directly on the call of cooling/heating. The damper position is Pos H.
b. Configured by Y1O or Y2O.
c. Configured by 6FAN.
LEGEND
Spd L — Low Speed (Fan)
Spd H — High Speed (Fan)

Table 12 — Different Damper Minimum Positions with Different Configured Outputs

(regardless of cooling demand, OCC=Yes)
2-SPEED FANb| •  Pos H (regardless of cooling demand, OCC=Yes)| •  Pos L (0 or 1 cooling demand)
• Pos H (2 cooling demands)

NOTE(S):
a. Configured by Y1O or Y2O.
b. Configured by 6FAN.

LEGEND
Pos L — Damper MIN POS for Low-Speed Fan
Pos H — Damper MIN POS for High-Speed Fan

If DCV (demand controlled ventilation) is enabled, each fan speed corresponds to two damper position ventilation setpoints (VENT MIN, VENT MAX), e.g., Pos L corresponds to 2VENTMIN L… 2VENTMAX L. See Table 13 for Different Damper Position Setting
with Different Configured Outputs with DCV enabled. If CO2 sensor is connected but DCV is disabled, then each fan speed corresponds to one minimum damper position ventilation setpoint. See Table 14 for Different Damper Position Setting with Different Configured Outputs with DCV disabled.

Table 13 — Different Damper Position Settings with Different Configured Outputs (DCV is Enabled)

• 2VENTMIN H to 2VENTMAX H (2 cooling demands)

NOTE(S):
a. Configured by Y1O or Y2O.
b. Configured by 6FAN.

Table 14 — Different Damper Position Settings with Different Configured Outputs (DCV is Disabled, CO2 sensor is connected)

2VENTMIN H (regardless of cooling demand, OCC=Yes)
2-SPEED FANb| •  2VENTMIN H (regardless of cooling demand, OCC=Yes)| • 2VENTMIN L (0 or 1 cooling demand)
• 2VENTMIN H (2 cooling demands)

NOTE(S):
a. Configured by Y1O or Y2O.
b. Configured by 6FAN.
Cooling Delay via Increasing Fan Speed
If there is cooling demand while outside air is suitable for economizing, then the economizer controller tries to increase fan speed to maximize the use of outside air first. If the cooling demand is not reached within a set time, then mechanical cooling will be enabled.
Typical field application:

1. Prerequisites:
   • Outside air is suitable for economizing and free cooling is ON.
   • Fan connected to the controller supports multiple speeds. Cooling delay function does not work if only a one-speed fan is connected to the controller.

2. If it is a 2-speed fan and there are two cooling demand inputs/ outputs and Y1-Input is called, then the controller sets fan speed to Speed Low. Damper is fully open (100%).
   If Y2-Input is also called, then the controller increases fan speed to Speed High and starts fan delay (2FAN DLY) time. After the delay time runs out, the controller starts Y1-Output.

Demand Controlled Ventilation (DCV)
If a field-installed CO2 sensor is connected to the EconomizerONE controller, then a demand controlled ventilation strategy will operate automatically. As the CO2 level in the space increases above the setpoint (on the EconomizerONE controller), the minimum position of the dampers will be increased proportionally until the Maximum Ventilation setting is reached.
As the space CO2 level decreases because of the increase in fresh air, the outdoor damper will follow the higher demand condition from the DCV mode or from the free cooling mode.
The controller modulates the outside air damper based on the CO2 level through the ppm value selected between the range of 500 and 2000 ppm. The measured CO2 concentration value is compared with the set DCV setpoint. If the measured CO2 concentration value is below the DCV setpoint, then keep the damper to the minimum position.
Otherwise, enable DCV. Once DCV is enabled, the DCV PID starts to run to control the indoor CO2 concentration value towards the DCV setpoint. The damper opens to the maximum position.
NOTE: DCV is disabled if the controller receives no occupancy signal.
DCV operation is available in Occupied and Unoccupied periods with the EconomizerONE system. However, a control modification will be required on the unit system to implement the Unoccupied period function. Refer to controller accessory installation  instruction manual for further controls and command operation information.
High Humidity Limitation
The economizer controller applies high limit of humidity to enthalpy-based economizing. When the OA dew point is below the dew point setpoint, enthalpy- based economizing is available. Otherwise, enthalpy-based economizing is unavailable.
Anti-Freeze Protection
The economizer controller initiates the anti-freeze protection if MAT or OAT temperature falls below the anti-freeze setpoint.
MAT-Based Anti-Freeze Protection

1. If MAT temperature falls below the anti-freeze setpoint (3FRZ PROT), then:
   • The controller closes both damper and compressor if unit type is conventional unit and cooling/heating conventional operation mode is enabled.
   • The controller closes the damper if unit type is heat pump and heat pump operation mode is enabled.

2. If the MAT sensor fails, MAT is substituted by OAT to continue the anti-freeze assessment. If OAT fails too, the controller closes the damper immediately.

OAT-Based Anti-Freeze Protection
If OAT temperature falls below the OAT lockout setpoint (3OAT LOCK):

1. The controller stops the compressor from running if unit type is conventional unit and cooling/heating conventional operation mode is enabled.
2. The controller compressor is bypassed if unit type is heat pump and heat pump operation mode is enabled.

Exhaust Fan Operation
Up to two exhaust fans can be connected to the economizer controller.

• If Exhaust Fan 1 is connected and configured, then Exhaust Fan 1 parameter group (L, M and H) is available, depending on fan configuration.
• If Exhaust Fan 2 is connected and configured, then Exhaust Fan 2 parameter group (L, M and H) is available, depending on fan configuration.
• The controller energizes Exhaust Fan Relay 1 and Exhaust Fan Relay 2 if the damper position reaches Exhaust Fan 1 parameter setting and Exhaust Fan Relay 2 parameter setting respectively. The selection of L, M, or H matches the current fan speed.

NOTE: If terminal ACT-FB is configured, then the damper position is the damper feedback position.
If feedback signal is unavailable, it is the simulated position. Occupancy Input
The economizer controller can receive an occupancy signal from the connected thermostat or work under Occupied mode all the time. This is configurable in the Thermostat setup from the Climatix™ mobile application or under the I/O Configuration menu on the inbuilt display.
See “Parameter Settings — I/ O Configurations” on page 41 for more information.
IMPORTANT: On the call of cooling, when the controller is configured to receive signal from the thermostat but the thermostat is working under the Unoccupied mode, the damper is fully closed if outside air is not suitable for economizing. If outside air is suitable for economizing, the damper is fully open.
Pre-occupancy Purge
The pre-occupancy purge demand comes from the configuration of the Auxiliary features in the Climatix™ mobile application or 6AUX2-I under the I/O Configuration menu on the inbuilt display.
During pre-occupancy purge on the call of heating or when there is no cooling/heating demand, the damper position is MIN POS.
During pre-occupancy purge on the call of cooling, the damper position is MIN POS if outside air is not suitable for economizing.
If outside air is suitable for economizing, then the damper is fully open.
Airflow Commissioning
Airflow measurement station (differential pressure signal) can connect to the controller temporarily to run airflow commissioning to calculate, calibrate, and store 4 fan speed characteristic curves automatically at damper positions 40%, 60%, 80%, and 100%. The controller places the damper to a proper position to meet minimum or any other airflow requests in cfm.
Users can enable this function only from the Climatix™ mobile application if the related function is available in the current mobile application version.
Fault Detection and Diagnostics
The economizer controller can detect and diagnose free cooling faults, sensor operation faults, and damper modulating faults. It can also report anti-freeze and shutdown notifications and actuator errors. Following is a list of all detectable or reportable information:

• Sensor disconnected or has no signal.
• Sensor short or high signal (under range or over range).
• Not economizing.
• Unexpected economizing.
• Excess outdoor air.
• Damper not modulating.
• Input power monitor and brownout. After detecting brownout, the economizer controller enters the brownout protection mode and disables all of the relay outputs.
• Anti-freeze notifications.
• Shutdown notifications.
• Actuator errors.
• Too low or too high leaving air temperature.
• Cooling/heating error.
• Damper actuator cycle count. Parameter 1ACT CNT indicates number of times actuator has cycled. It is resettable via HMI item 8ACT CNT RESET.

IMPORTANT: The first 6 faults are detectable via LEDs or alarm reports on the LCD. See LED Indication on page 29 and Alarms on page 42 for fault indications. These faults can also be displayed in the Operating section of the Climatix™ mobile application.

Firmware Update
NOTE: Back up configurations before firmware update. All the previous configuration data are erased after firmware update.
NOTE: Contact Application Engineering for more information on support for firmware.
IMPORTANT: If the controller enters the configuration state for the convenience of I/O configurations, then users can manually switch to the running state after finishing configurations. To do so, press Enter + Up at the same time, and then press Enter to confirm the switch after 8RUN STATE appears on the LCD.

WARNING
Failure to follow this caution may result in damage to equipment. Be sure to allow enough time for compressor startup and shutdown between checkout tests so that the compressors do not short-cycle.
Mounting Devices Connected to the Economizer Controller
Devices like damper actuators, sensors (temperature sensor, humidity sensor, combination temperature and humidity sensor, CO2 sensor), thermostats, and exhaust fans can be connected to the economizer controller. For information on how to mount the devices, see the device’s installation instructions. See Fig. 46 and Table 15 for economizer controller wiring details.

Table 15 — EconomizerONE Control Wiring Settings

Sensor
5| COM| COM| Mixed or Discharge Air Temperature Sensor Common
6| OAT| Type II NTC 10K or 0-10 vdc| Outside Air Temperature Sensor
7| OAH| 0-10 vdc or 4-20mA| Outside Air Relative Humidity Sensor
8| COM| COM| Outside Air Temperature Sensor or Outside Air Relative Humidity Sensor Common
9| AUX-AI| 0-10 vdc, 2-10 vdc or 0-5 vdc| Air Quality Sensor or Pressure Sensor
10| RAT| Type II NTC 10K or 0-10 vdc| Return Air Temperature Sensor
11| RAH| 0-10 vdc or 4-20mA| Return Air Relative Humidity Sensor
12| S-COM| COM| 24 vac Common
13| S-24V| 24 vac| 24 vac Power Out to Sensors
14| ACT-FB| 2-10 vdc| Damper Actuator Feedback
15| ACT2-10| 2-10 vdc| Damper Actuator Output
16| ACT-COM| COM| Damper Actuator Output Common
17| ACT-24V| 24 vac| 24 vac Power Out to Damper Actuator
18| AUX2-O| 24 vac OUT| Configurable:
• Exhaust Fan (1 or 2)
• System Alarm output (Title 24)
19| COM| COM| 24 vac Common
20| AUX2-I| 24 vac IN| Configurable:
•  Shut Down
• Heat Conventional (W1)
• Heat Pump Changeover (reversing valve OB)
• Pre-occupancy
21| AUX1-O| 24 vac OUT| Configurable:
•  Exhaust Fan (1 or 2)
• System Alarm output (Title 24)
22| COM| COM| 24 vac Common
23| AUX1-I| 24 vac IN| Configurable:
• Shut Down
• Heat Conventional (W1)
• Heat Pump Changeover (reversing valve OB)
• Pre-occupancy
24| OCC| 24 vac IN| Occupancy Input
25| Y2O| 24 vac OUT| Cooling Stage 2 Output to Stage 2 Mechanical Cooling
26| Y2I| 24 vac IN| Cooling Stage 2 Input from Commercial Thermostat
27| Y1O| 24 vac OUT| Cooling Stage 1 Output to Stage 1 Mechanical Cooling
28| Y1I| 24 vac IN| Cooling Stage 1 Input from Commercial Thermostat
29| C| COM| 24 vac Common
30| R| 24 vac| 24 vac Power

Connecting Peripheral Devices to the Economizer Controller
See Fig. 47-51 for wiring details.

SETUP AND CONFIGURATION

IMPORTANT: Before setup and configuration, it is recommended to obtain some location-based values, such as shutoff points, or utilize the location services in the Climatix™ mobile application.
Set up and configure the economizer controller before putting it into usage. This can be accomplished by using the Climatix™ mobile application or the inbuilt display. After sensor, compressor, thermostat, or actuator is connected to the economizer controller,
values/statuses are displayed in the Operating section of the mobile application and on the LCD. Users can manually change basic and advanced settings, configure I/Os, and test the damper operation and any configured outputs by modifying the corresponding
parameter values in the local device or mobile application.
See Tables 16-23 for complete list of all parameters available on the LCD display. Refer to it during the setup and configuration process.
NOTE: For all units, the Climatix application login is:
Administrator. For units coming from the factory with CO2 configuration or single enthalpy (control mode 3), the controller password is OneBT2.1. For all other units, use the controller password OneBT.
NOTE: Parameters and display menus may display differently/ dynamically if different applications are configured. See Tables 16-23.

IMPORTANT: Not all operations are available on the local POL224. For example, users can only obtain shutoff setpoints and perform cfm commissioning via the Climatix™ mobile application. Setup and configuration on the local device are only recommended if operations from the mobile application are unavailable. Check the mobile application for all operations that can be performed from the mobile application end.

IMPORTANT: By connecting the RS485 port to a PC, all parameters are also readable or writable from PC tools such as Modbus Poll.exe via Modbus®a and Yabe.exe via BACnet™a MSTP (Bps 38400 [default], Bps 9600, Bps 19200, Bps 115200). Note that an external End of Line (EOL) element is required to achieve Baud Rate 115200 at a maximum cable length of 4000 ft (1.2 km).

NOTE(S):
a. Third-party trademarks and logos are the property of their respective owners.

Table 16 — Status Display

YES NO
1ECON ENAB| Indicates whether outdoor air is being used for the first stage of cooling.
1OCCUPIED| Indicates whether the space is occupied. If users choose ALWAYS for 6OCC when configuring I/Os, then the parameter value is YES; if users keep the default selection
T-STAT for 6OCC and the controller receives 24-v signal from OCC input, then the value is YES. Otherwise, the value is NO.
1Y1-IN| Y1-In call from thermostat for Cooling Stage 1.| ON OFF
1Y1-OUT| Y1-Out signal to compressor for Cooling Stage 1.
1Y2-IN| Y2-In call from thermostat for Cooling Stage 2.
1Y2-OUT| Y2-Out signal to compressor for Cooling Stage 2.
Dynamic item: Appears only if Y2-Out terminal is configured.
1AUX1-I| Aux1-In signal
Dynamic item: Appears only if Aux1-In terminal is configured.
1AUX1-O| Aux1-Out signal
Dynamic item: Appears only if Aux1-Out terminal is configured.
1AUX2-I| Aux2-In signal
Dynamic item: Appears only if Aux2-In terminal is configured.
1AUX2-O| Aux2-Out signal
Dynamic item: Appears only if Aux2-Out terminal is configured.
1COMP STAGE| Indicates compressor current stage.| Off
1
2
3
1HEAT ENAB| Indicates whether heating is enabled.| YES NO
1MIX AIR LOW| Indicates whether the anti-freeze protection function is enabled for a mixed air temperature sensor. If the detected air temperature is lower than the anti-freeze protection setpoint (3FRZ PROT), then the parameter value is YES. Otherwise, it is NO.
1MAT PRES| Indicates the present value of the mixed air temperature (MAT) sensor.
Dynamic item: Appears only if MAT or AUTO is selected for 3DIF T LOC under Parameter Settings — Advanced on page 41.| The corresponding detected value is displayed on the LCD.
1LAT PRES| Indicates the present value of the leaving air temperature (LAT) sensor.
Dynamic item: Appears only if LAT or AUTO is selected for 3DIF T LOC.
1OAT PRES| Indicates the present value of the outdoor air temperature (OAT) sensor.
Dynamic item: Appears only if an OAT sensor is configured.
1OAH PRES| Indicates the present value of the outdoor air relative humidity (OAH) sensor.
Dynamic item: Appears only if an OAH sensor is configured.
1RAT PRES| Indicates the present value of the return air temperature (RAT) sensor.
Dynamic item: Appears only if a RAT sensor is configured.
1RAH PRES| Indicates the present value of the return air relative humidity (RAH) sensor.
Dynamic item: Appears only if a RAH sensor is configured.
1CO2 PRES| Indicates the present value of the CO2 sensor.
Dynamic item: Appears only if a CO2 sensor is configured.
1DCV STATUS| Indicates the demand controlled ventilation (DCV) status.
Dynamic item: Appears only if a CO2 sensor is configured.
Displays ON if the measured CO2 concentration value is above the DCV setpoint and OFF if below the DCV setpoint.|

ON OFF

1FAN SPD LV| Indicates the current fan speed status (low, medium, or high). If a one-speed fan is connected and configured, then this item is invisible.
Dynamic item: Appears only if “6FAN” is configured as “2SPEED” under Parameter Settings — I/O Configurations on page 41.| L H
1ACT OUT| Indicates current position of damper actuator in V.| The corresponding detected value is displayed on the LCD.
1ACT FB| Indicates feedback signal of damper actuator in V.
1ACT POS| Indicates current position of damper actuator in % Open.
1ACT CNT| Indicates number of times actuator has cycled (1 cycle = 180 degrees of movement in any direction). Resettable via HMI item 8ACT CNT RESET under Enter Running State on page 43.
1EQUIP| Indicates the equipment type. If HP(O) or HP(B) is chosen for 6AUX1-I, then the parameter value is HP(O) or HP(B) respectively. If neither is chosen, then the value is CON RTU.| HP(O)
HP(B) CON RTU
1OAT LOCK| Indicates status of the OAT cooling lockout function.| NO LCKOUT OVRD
1INS| Indicates the installation date of the economizer controller. If the installation date is incorrect, press Enter to change and confirm month, date, and year.| —

Table 17 — Parameter Settings — Basic

smartphone or tablet with the mobile application installed on it is connected to the network provided by a Wi-Fi/WLAN stick plugged into the economizer controller. This can also be a manually defined setpoint.| 48…80°F; increment by 1| 63°F
2ENTH OFF| Enthalpy shutoff setpoint can be obtained automatically if a smartphone or tablet with the mobile application installed on it is connected to the network provided by a Wi-Fi/WLAN stick plugged into the economizer controller. This can also be a manually defined setpoint.
Dynamic item: Appears only if an OAH sensor is configured.| 22…30 Btu/lbm; increment by 1| 28 Btu/lbm
2DVC| Demand controlled ventilation setpoint can be obtained automatically if a smartphone or tablet with the mobile application installed on it is connected to the network provided by a Wi-Fi/WLAN stick plugged into the economizer controller. This can also be a manually defined setpoint.
Dynamic item: Appears only if a CO2 sensor is configured.| 300…2000PPM; increment by 100| 1100PPM
2FAN L ACT| Damper minimum position when fan runs at a low speed.
Dynamic item: Appears only if “6FAN” is configured as “2SPEED” under Parameter Settings — I/O Configurations on page 41.| 2…10V; increment by 0.1| 3.6V
2FAN H ACT| Damper minimum position when fan runs at a high speed.
Dynamic item: Appears only if “6FAN” is configured as “1SPEED” or “2SPEED”.| 2…10V; increment by 0.1| 2.8V
2VENTMAX L| DCV maximum position when fan runs at a low speed.
Dynamic item: Appears only if a CO2 sensor is configured and “6FAN” is configured as “2SPEED”.| 2…10V; increment by 0.1| 3.6V
2VENTMAX H| DCV maximum position when fan runs at a high speed.
Dynamic item: Appears only if a CO2 sensor is configured and “6FAN” is configured as “1SPEED” or “2SPEED”.| 2…10V; increment by 0.1| 3.6V
2VENTMIN L| DCV minimum position when fan runs at a low speed.
Dynamic item: Appears only if a CO2 sensor is configured and “6FAN” is configured as “2SPEED”.| 2…10V; increment by 0.1| 3.1V
2VENTMIN H| DCV minimum position when fan runs at a high speed.
Dynamic item: Appears only if a CO2 sensor is configured and “6FAN” is configured as “1SPEED” or “2SPEED”.| 2…10V; increment by 0.1| 2.3V
CFM COMM| Air Flow Chart: CFM commissioning can only be initiated from the mobile application. When CFM commissioning is in progress, the local device reads “CFM COMM”.| —| —
2DEGREES| Temperature unit (°F or °C).| —| °F
2FAN| Fan cfm.| 100…50,000cfm; increment by 100| 5000cfm
2EX1 L| Exhaust Fan 1 low-speed parameter setting.

Dynamic item: Appears only if:
•  Exhaust Fan 1 is configured.
•      “6FAN” is configured as “2SPEED”.

| 0…100%; increment by 1| 65%
2EX1 H| Exhaust Fan 1 high-speed parameter setting.
Dynamic item: Appears only if:
• Exhaust Fan 1 is configured.
• “6FAN” is configured as “1SPEED” or “2SPEED”.| 0…100%; increment by 1| 50%
2EX2 L| Exhaust Fan 2 low-speed parameter setting.
Dynamic item: Appears only if:
•  Exhaust Fan 2 is configured.
•  “6FAN” is configured as “2SPEED”.| 0…100%| 80%
2EX2 H| Exhaust Fan 2 high-speed parameter setting.
Dynamic item: Appears only if:
•  Exhaust Fan 2 is configured.
•  “6FAN” is configured as “1SPEED” or “2SPEED”.| 0…100%; increment by 1| 75%
2THL| Temperature high limitation.
Dynamic item: Appears only if an RAT sensor is configured.| 0…100%; increment by 1| 83%
2EHL| Enthalpy high limitation.
Dynamic item: Appears only if an RAH sensor is configured.| 30…50 Btu/lbm; increment by 1| 33 Btu/lbm
2FAN DLY| Cooling delay via increasing fan speed.| 0…30 min; increment by 1| 5 min.

Table 18 — Parameter Settings — Advanced

• Choose MAT if the sensor is installed before the DX (Direct Expansion) coil.
• Choose LAT if the sensor is installed after the DX coil.
•  Choose AUTO to let the economizer controller automatically detect the location.| MAT LAT AUTO| LAT
3LAT LOW| Low limit of leaving air temperature.
Dynamic item: Appears only if LAT or AUTO is selected for 3DIF T LOC.| 35…65°F; increment by 1| 45°F
3LAT HIGH| High limit of leaving air temperature.
Dynamic item: Appears only if LAT or AUTO is selected for 3DIF T LOC.| 70…180°F; increment by 1| 80°F
3OAT CAL| OAT sensor calibration.| –2.5. 2.5°F; increment by 0.5| 0°F
3RAT CAL| RAT sensor calibration.
Dynamic item: Appears only if an RAT sensor is configured.| –2.5. 2.5°F; increment by 0.5| —
3OAH CAL| OAH sensor calibration.
Dynamic item: Appears only if an OAH sensor is configured.| –10…10%; increment by 0.5| 0%
3RAH CAL| RAH sensor calibration.
Dynamic item: Appears only if an RAH sensor is configured.
3MAT CAL| MAT or LAT sensor calibration.| –2.5. 2.5°F; increment by 0.5| 0°F
3MAT SET| Setpoint of MAT or LAT sensor.| 38…70°F; increment by 1| 53°F
3FRZ PROT| Anti-freeze protection setpoint of MAT sensor.| 35…55°F; increment by 1| 45°F
3ACT TOLR| Actuator tolerance setpoint between output (in percent) and feedback (in percent).| 0…15%; increment by 1| 8%
3OAT LOCK| OAT lockout set point for anti-freeze protection.| –45…80°F; increment by 1| 32°F
3OAT LCKOVRD| When OAT LOCKOUT is enabled, choose to override the cooling lockout function or not.| YES NO| NO
3OAT LOCKODLY| Indicates the overridden time if “YES” is selected for “3OAT LCKOVRD”.| 0…300 min; increment by 1| 45 min.

Table 19 — Parameter Settings — I/O Configurations

• None
• Heat Conventional (W1) from thermostat
•  Heat pump (reversing valve O)
• Heat pump (reversing valve B)
• Pre-occupancy signal from thermostat
•  Shutdown signal from unit| NONE HP(O) HP(B) PREOCC SHUTDWN| W1
6AUX2-I| Auxiliary DI-2. Configurable as:
• None
• Heat stage 1 (W1) from thermostat
• Heat pump (reversing valve O)
• Heat pump (reversing valve B)
• Pre-occupancy signal from thermostat
• Shutdown signal from unit
NOTE: Whichever is chosen for 6AUX1-I does not appear in the list of 6AUX2-I.| NONE W1 HP(O)
HP(B) PREOCC SHUTDWN| NONE
6OAT SIG| Configures signal type of OAT sensor.| 0-10V NTC10K| NTC10K
6RAT SIG| Configures signal type of RAT sensor.| 0-10V NTC10K NONE| NONE
6OAH SIG| Configures signal type of OAH sensor.| 0-10V
4-20mA NONE| NONE
6RAH SIG| Configures signal type of RAH sensor.
6MAT SIG| Configures signal type of MAT or LAT sensor.| 0-10V NTC10K| NTC10K
6AUX-AI1| Auxiliary AI-1. Configurable as:
• CO2 sensor
• Static pressure (temporarily for cfm commissioning) sensor
•  None| PRESSURE CO2 NONE| NONE
6X-AI1 SIG| Configures CO2 sensor type.
Dynamic item: Appears only if “CO2” is selected for “6AUX-AI1”.| 0-10V
2-10V
0-5V| 0-10V
6CO2 Rng L| Configures the low limit of CO2 measuring range.
Dynamic item: Appears only if “CO2” is selected for “6AUX-AI1”.| 0…500; increment by 10| 0
6C02 Rng H| Configures the high limit of CO2 measuring range.
Dynamic item: Appears only if “CO2” is selected for “6AUX-AI1”.| 1000…3000; increment by 50| 2000
6AUX-AI2| Choose ACT FB if feedback signal is available from the connected damper actuator. Otherwise, choose NONE.| ACT FB NONE| ACT FB
PARAMETER| DESCRIPTION| VALUE| DEFAULT
---|---|---|---
6Y2O| Choose “ COOL 2 ” if Cooling Stage 2 is available (another compressor is connected to the Economizer). Otherwise, choose “ NONE ”.| COOL 2 NONE| COOL 2
6AUX1-O| Auxiliary DO-1. Configurable as:
• None.
• Exhaust fan (1 or 2).
•  Alarm output to thermostat (Title 24).| NONE ALARM EXHAUST| EXHAUST
6AUX2-O| Auxiliary DO-2. Configurable as:
• None.
• Exhaust fan (1 or 2).
• Alarm output to thermostat (Title 24).
NOTE: Except for Exhaust Fan, whichever is chosen for 6AUX1-O does not appear in the list of 6AUX2-O.| NONE ALARM EXHAUST| ALARM
6RS485| Switch between MSTP and Modbus.| MSTP MODBUSSLV| MSTP

Table 20 — Alarm Parameters a,b

PARAMETER

|

DESCRIPTION

---|---
NO ALARM| No alarm is activated.
4MAT SEN ALARM| MAT sensor has failed, gone out of range, or become disconnected.
4CO2 SEN ALARM| CO2 sensor has failed, gone out of range, or become disconnected.
4OAT SEN ALARM| OAT sensor has failed, gone out of range, or become disconnected.
4OAH SEN ALARM| OAH sensor has failed, gone out of range, or become disconnected.
4RAT SEN ALARM| RAT sensor has failed, gone out of range, or become disconnected.
4RAH SEN ALARM| RAH sensor has failed, gone out of range, or become disconnected.
4FREEZE ALARM| Anti-freeze notification when MAT sensor is below anti-freeze protection setpoint.
4RTU SHUTDOWN| Notification of Shutdown Active when SHUTDWN is chosen for 6AUX1-I or 6AUX2-I.
4ACTUATOR ALARM| Actuator gets disconnected or has failed.
4ACT UNDER V| Voltage received by the actuator is below expected range.
4ACT OVER V| Voltage received by the actuator is above expected range.
4ACT STALLED| Damper actuator stopped before achieving commanded position.
4ACT SLIPPING| Damper actuator slips after reaching commanded position.
4NOT ECON| Not economizing when it should.
4ECON SHOULDNT| Economizing when it should not.
4EXCESS OA| Excess outdoor air. Outside air intake is significantly higher than it should be.
4LLA ALARM| Leaving air temperature is lower than the low limit (3LAT LOW).
4HLA ALARM| Leaving air temperature is higher than the high limit (3LAT HIGH).

NOTE(S):
a. All alarms are dynamic An alarm appears only if a related symptom mentioned above is detected.
b. An alarm activation triggers a general alarm and then the configured system alarm output (AUX1-O or AUX2-O) is If there is no alarm, then NO ALARM is displayed on the HMI.
Table 21 — Test Commands

PARAMETER

|

DESCRIPTION

---|---
7DAMPER MIN POS| Press Enter to test whether the economizer controller can drive damper to minimum position.
7DAMPER CLOSE| Press Enter to test whether the economizer controller can drive damper to 100% Closed.
7DAMPER OPEN| Press Enter to test whether the economizer controller can drive damper to 100% Open.
7DAMPER ALL| Press Enter to perform all the above tests.
7DAMPER| Press Enter to test whether the economizer controller can drive damper to the selected voltage.
7Y1O| Press Enter to test whether the economizer controller can turn on or off the first stage of cooling (close or open relay Y1O).
7Y2O| Press Enter to test whether the economizer controller can turn on or off the second stage of cooling (close or open relay Y2O).
7AUX1-O| Press Enter to test AUX1-O connection (close or open relay AUX1-O).
7AUX2-O| Press Enter to test AUX2-O connection (close or open relay AUX2-O).

Table 22 — Enter Running State

PARAMETER

|

DESCRIPTION

---|---
8RUN STATE| Change to Running State. Press Enter to confirm the change.
8ENTER RUN?| Confirm the change to Running State.
8FACTORY DEF| Perform factory reset. Press Enter to confirm the reset. (This action resets the controller password to default: OneBT.)
8DEF CONFIRM?| Confirm the factory resetting.
8ACT CNT RESET| Damper count reset.
8VER x.x.x| Firmware version information such as 0.1.10.

Table 23 — Enter Configuration State and Restart

PARAMETER

|

DESCRIPTION

---|---
5CONFIG STATE| Change to Configuration State. Press Enter to confirm the change.
5ENTER CONFIG?| Confirm the change to Configuration State.
5RESTART| Restart the economizer controller. Press Enter to confirm the restart.
5CONF RESTART| Confirm the restart.

INSTALLING OPTIONAL HH57LW001 SINGLE OUTSIDE AIR ENTHALPY SENSOR
When using the HH57LW001 enthalpy sensor (see Fig. 52) for outside air changeover, the existing HH79NZ039 dry bulb sensor (see Fig. 53) must be removed. The enthalpy sensor will be mounted in the same location as the dry bulb sensor (see Fig. 54). When the enthalpy sensor’s OA (Outside Air) temperature, enthalpy, and dew point are below their respective setpoints, the outside air can be used for free cooling. When any of these are above the setpoint, free cooling will not be available. Enthalpy setpoints are configurable and create an enthalpy boundary according to the user’s input. For additional details, see Fig. 55-56 and Table 24.
Harness 48TC005213 is required to be connected between the EconomizerONE harness in the return air chamber. Harness 48TC005213 has a 5-pin plug that connects directly to the HH57LW001 enthalpy sensor.
Enthalpy Control Sensor Configuration
The optional enthalpy control sensor (P/N: HH57LW001) com-municates with the POL224 economizer controller using the 5-wire harness, 48TC005213. The HH57LW001 sensor can be used as a single outside air enthalpy, a differential return enthalpy, or a differential return temperature sensor. Refer to the base unit control wiring diagrams found earlier in this book to wire the HH57LW001 enthalpy sensor for each option. Use Fig. 52 and Table 26 on page 46 to locate the wiring terminals for each enthalpy control sensor. Table 24 — Enthalpy Manual Entry Setpoints for EconomizerONE Per Climate Zone

CLIMATE ZONESa| 2 TEMP OFF| LOWEST SETTING| RH%| 2 ENTH OFF| RH%| 2THL| 2EHL| RH%
---|---|---|---|---|---|---|---|---
1| 65°F| 22 Btu/lbm| 43%| 28 Btu/lbm| 86%| 83°F| 33 Btu/lbm| 48%
2| 65°F| 22 Btu/lbm| 43%| 28 Btu/lbm| 86%| 83°F| 33 Btu/lbm| 48%
3| 65°F| 22 Btu/lbm| 43%| 28 Btu/lbm| 86%| 83°F| 33 Btu/lbm| 48%
4| 65°F| 22 Btu/lbm| 43%| 28 Btu/lbm| 86%| 83°F| 33 Btu/lbm| 48%
5| 70°F| 22 Btu/lbm| 28%| 28 Btu/lbm| 65%| 83°F| 33 Btu/lbm| 48%
6| 70°F| 22 Btu/lbm| 28%| 28 Btu/lbm| 65%| 83°F| 33 Btu/lbm| 48%
7 and 8| 75°F| 22 Btu/lbm| 19%| 28 Btu/lbm| 50%| 83°F| 33 Btu/lbm| 48%
CALIFORNIA TITLE 24 ZONESb| 2 TEMP OFF| LOWEST SETTING| RH%| 2 ENTH OFF| RH%| 2THL| 2EHL| RH%
1| 75°F| 22 Btu/lbm| 19%| 28 Btu/lbm| 50%| 83°F| 33 Btu/lbm| 48%
2| 73°F| 22 Btu/lbm| 22%| 28 Btu/lbm| 55%| 83°F| 33 Btu/lbm| 48%
3| 75°F| 22 Btu/lbm| 19%| 28 Btu/lbm| 55%| 83°F| 33 Btu/lbm| 48%
4| 73°F| 22 Btu/lbm| 22%| 28 Btu/lbm| 55%| 83°F| 33 Btu/lbm| 48%
5| 75°F| 22 Btu/lbm| 19%| 28 Btu/lbm| 50%| 83°F| 33 Btu/lbm| 48%
6| 71°F| 22 Btu/lbm| 28%| 28 Btu/lbm| 62%| 83°F| 33 Btu/lbm| 48%
7| 69°F| 22 Btu/lbm| 32%| 28 Btu/lbm| 68%| 83°F| 33 Btu/lbm| 48%
8| 71°F| 22 Btu/lbm| 28%| 28 Btu/lbm| 62%| 83°F| 33 Btu/lbm| 48%
9| 71°F| 22 Btu/lbm| 28%| 28 Btu/lbm| 62%| 83°F| 33 Btu/lbm| 48%
10| 73°F| 22 Btu/lbm| 22%| 28 Btu/lbm| 55%| 83°F| 33 Btu/lbm| 48%
11| 75°F| 22 Btu/lbm| 19%| 28 Btu/lbm| 50%| 83°F| 33 Btu/lbm| 48%
12| 75°F| 22 Btu/lbm| 19%| 28 Btu/lbm| 50%| 83°F| 33 Btu/lbm| 48%
13| 75°F| 22 Btu/lbm| 19%| 28 Btu/lbm| 50%| 83°F| 33 Btu/lbm| 48%
14| 75°F| 22 Btu/lbm| 19%| 28 Btu/lbm| 50%| 83°F| 33 Btu/lbm| 48%
15| 75°F| 22 Btu/lbm| 19%| 28 Btu/lbm| 50%| 83°F| 33 Btu/lbm| 48%
16| 75°F| 22 Btu/lbm| 19%| 28 Btu/lbm| 50%| 83°F| 33 Btu/lbm| 48%
CONTROLLER DEFAULT SETTINGS| 2 TEMP OFF| —| —| 2 ENTH OFF| —| 2THL| 2EHL| RH%
DEFAULT SET POINTS| 63°F| —| —| 28 Btu/lbm| 94%| 83°F| 33 Btu/lbm| 48%

NOTE(S):
a. See Fig. 56 for map of U.S. and Canada climate zones.
b. See Fig. 55 for map of California Title 24 zones.
Economizers are shipped standard with an HH79NZ039 outside air dry bulb sensor (see Fig. 53). System default setting (high temp limit) is 63°F (17°C) and has a range of 48°F to 80°F (9°C to 27°C). Sensor is factory installed on economizer.
NOTE: A second HH79NZ039 sensor is provided for mixed air temperature.
NOTE: California high temperature setting requirements by region are shown in Table 25.
Enthalpy Settings (Enthalpy Option)
If installing the optional HH57LW001 enthalpy sensor, the HH79NZ039 dry bulb outside air sensor must first be removed.
Wire sensor to harness 48TC005213 and the (5) wires from the harness to the EconomizerONE harness in the return air chamber.
Harness 48TC005213 has a 5-pin plug that connects directly to the HH57LW001 enthalpy sensor. Refer to the base unit control wiring diagrams earlier in this book for wiring connections. Refer to Fig. 52 and Table 26.
California’s Title 24 High Temperature
Limit Settings
California’s Title 24 code requires a high temperature limit setting for all dry bulb outside air economizer changeover.
The temperatures vary by the region within California. See Table 25 for high limit settings.
Table 25 — California Title 24 Regional High Limit Dry Bulb Temperature Settingsa

DEVICE TYPEb| CLIMATE ZONES| REQUIRED HIGH LIMIT (ECONOMIZER OFF WHEN): DESCRIPTION
---|---|---
FIXED DRY BULB| 1, 3, 5, 11-16| OAT exceeds 75°F (23.8°C)
2, 4, 10| OAT exceeds 73°F (22.7°C)
6, 8, 9| OAT exceeds 71°F (21.6°C)
7| OAT exceeds 69°F (20.5°C)
DIFFERENTIAL DRY BULB| 1, 3, 5, 11-16| OAT exceeds RA temperature
2, 4, 10| OAT exceeds return air temperature–2°F (–18.8°C)
6, 8, 9| OAT exceeds return air temperature–4°F (–20°C)
7| OAT exceeds return air temperature–6°F (–21.1°C)
FIXED ENTHALPYc + FIXED DRY BULB| All| OAT exceeds 28 Btu/lb of dry airb or OAT exceeds 75°F (23.8°C)

NOTE(S):
a. This table sourced from 2019 California Energy Code, Title 24, Part 6, Table 140.4-E Air Economizer High Limit Shut Off Control Requirements.
b. Only the high limit control devices listed are allowed to be used and at the set points listed. Others such as Dew Point, Fixed Enthalpy, Electronic Enthalpy, and Differential Enthalpy Controls, may not be used in any climate zone for compliance with Section 140.4(e)1 unless approval for use is provided by the Energy Commission Executive Director.
c. At altitudes substantially different than sea level, the Fixed Enthalpy limit value shall be set to the enthalpy value at 75°F and 50% relative humidity. As an example, at approximately 6,000 foot elevation, the fixed enthalpy limit is approximately 30.7 Btu/lb.
LEGEND
OAT — Outdoor-air Thermostat
RA — Return Air
Table 26 — HH57LW001 Sensor Wiring Terminations

TERMINAL

| TYPE|

DESCRIPTION

---|---|---

NUMBER

|

LABEL

1| TCOM| NTC 10k| Outside Air Temperature Sensor Output
2| TSIG| NTC 10k| Outside Air Temperature Sensor Output
3| HSIG| 0-10 vdc| Outside Air Relative Humidity Sensor Output
4| HCOM| COMMON| Sensor 24-v Common Input
5| H24V| 24 vac| Sensor 24-v Operating Voltage Input

CHECKOUT
Inspect all wiring connections at the economizer module’s terminals, and verify compliance with the installation wiring diagrams.
For checkout, review the Status of each configured parameter and perform the Test Commands tests (refer to Table 21).
For information about menu navigation and use of the keypad see Interface Overview on page 28.
WARNING
ELECTRIC SHOCK HAZARD
Failure to follow this warning could result in personal injury, property damage, or death.
Before performing service or maintenance operations on unit, always turn off main power switch to unit and install lock(s) and lockout tag(s). Unit may have more than one power switch. Ensure electrical service to rooftop unit agrees with voltage and amperage listed on the unit rating plate.
If any wiring changes are required, first be sure to remove power from the economizer module before starting work.
Pay particular attention to verifying the power connection (24 vac).
Power Up
After the POL224 module is mounted and wired, apply power.
Initial Menu Display
On initial start up, “Welcome” displays on the economizer HMI screen. After a brief pause, the Parameter Settings — I/O Configuration (refer to Table 19) of the software appears, allowing the user to check that presets and default values are configured correctly.
Power Loss (Outage or Brownout)
All set points and advanced settings are restored after any power loss or interruption.
NOTE: All settings are stored in non-volatile flash memory.
Status
Use the Status menu (refer to Table 16) to check the parameter values for the various devices and sensors configured.
NOTE: For information about menu navigation and use of the keypad, see Interface Overview on page 28.
Checkout Tests
Use the Test Commands menu (refer to Table 21) to test the damper operation and any configured outputs. Only items that are configured are shown in the Test Commands menu.
NOTE: For information about menu navigation and use of the keypad, see Interface Overview on page 28.
To perform a Test Command test:

1. Scroll to the desired test in Test Command menu 7 using the Up and Down buttons.
2. Press the Enter button to select the item. RUN? appears.
3. Press the Enter button to start the test. The unit pauses and then displays IN PROGRESS. When the test is complete, DONE appears.
4. When all desired parameters have been tested, press Enter + Up to end the test.

The Checkout tests can all be performed at the time of installation or at any time during the operation of the system as a test that the system is operable.
CAUTION
EQUIPMENT DAMAGE HAZARD
Failure to follow this caution may result in equipment damage.
Be sure to allow enough time for compressor start-up and shutdown between checkout tests so that you do not shortcycle the compressors.

TROUBLESHOOTING

For EconomizerONE troubleshooting issues see Table 27.
Table 27 — Operating Issues and Concerns

SYMPTOM

| REASON|

SOLUTION

---|---|---
An alarm is displayed on the LCD| Sensor, damper, or the whole working system may not work properly| Check sensor, damper, or the whole working system following the detailed alarm information.
DAC LED is blinking RED| Damper slippage| Check whether the damper works properly.
DAC LED is blinking RED quickly| Damper unplugged| Check whether the damper is connected.
DAC LED is OFF| Terminal ACT-FB is configured but there is no available feedback signal| Check whether the feedback signal is connected; check if ACT- FB is faulty.
Economizer controller has no alarm, but the Free Cooling LED will not turn on when the OA seems to be suitable for Free Cooling| Shutoff SP setting error| Shutoff temperature and/or enthalpy set point is incorrectly set up. Consult an HVAC professional to set up the shutoff set point correctly.
OA temp is too low| The OA temperature is too low; therefore, there is no cooling demand. This could possibly enable anti-freeze protection.
OA temp is too high or too humid| In DIFF mode, even though OA temperature is lower than RA temperature, if both OA and RA temperatures exceed the high limit, then Free Cooling turns off.

In Differential Enthalpy control mode, even though OA enthalpy is lower than RA enthalpy, if both OA and RA enthalpy exceed the high limit, then Free Cooling turns off.

Economizer controller/ mechanical cooling is not operating| No input power| Use a multi-meter to check whether there is 24 vac ± 25% (18-30 vac) at the POWER terminals. If there is no voltage or if the voltage is significantly low, then check the transformer output voltage at the RTU. If 24-v is not present at the transformer secondary side, then check the primary line voltage to the transformer. If the line voltage is not present at the transformer

primary side, then check the primary power to the RTU, fuses, circuit breaker, and so on.

Brownout| If voltage is below 17-v, then the economizer controller may be in Brownout Protection mode. This mode disables all of the relay outputs. When the power is 19 vac or higher, the economizer controller and RTU operate normally.
Y1/Y2 signal is missing from the thermostat| Mechanical cooling does not run until there is cooling demand (Y1/Y2 Active). Check the wiring from Y1I and Y2I terminals to the commercial thermostat. 24-v should be present between Y1I/ Y2I and Y1O/Y2O respectively.

24 vac~ and 24 vac ^ are incorrectly wired

| 24 vac power supply has polarity when all devices are powered by the same 24 vac transformer; reversing polarity may cause a short circuit that can damage the system.
Follow the transformer polarity mark, check the wiring of 24-v~ (or G or 24-v+), and ensure that they are tied to the same polar of 24 vac power supply; while checking the wiring of ^ (or G0 or 24-v- or COM), ensure that they are all tied to another polar of 24 vac power supply.
Firmware update failure| Application file is damaged, operation is incorrect, and/or USB flash disk does not work properly| Reload a BIN file, restart the controller, update firmwarea, or change a USB flash disk. Contact service provider if failure still exists.
Free Cooling LED is solid RED| Sensor, damper, or whole working system may not work properly| Check sensor, damper, or the whole working system following the detailed alarm information.
Free Cooling LED is blinking RED| Not economizing when it should| Check the whole economizer working system, such as the sensor, damper, and thermostat.
Incorrect controller password error on mobile application| For CO2 and single enthalpy (control mode 3) configurations from the factory, the password has changed| For units coming from the factory with CO2 configuration or single enthalpy (control mode 3), use the controller password OneBT2.1.
For all other units, use the controller password OneBT.
Performing a factory reset on the controller will also reset the password to OneBT.
RS485 communication failure| RS485 signal or configuration error| Check wiring, configuration, Baud Rate (using mobile application), and other network communication parameters.
Sensor LED is blinking RED| Excess outdoor air| Check the whole economizer working system, such as the sensor, damper, and thermostat.
Sensor LED is solid RED| Mixed Air (MA) sensor error| Check the MA sensor. It must be either a Type II NTC 10K or 0-10 vdc sensor.
Outside Air (OA)/Return Air (RA) sensor error| Check the wiring and signal of the OA sensor. If in Differential (DIFF) mode, also check the RA sensor. The following sensor signals are valid:

Type II NTC 10K or 0-10 vdc temperature. 0-10 vdc or 4-20 mA humidity.

Air temperature failure/fault| Check the air temperature sensor signal. The valid signal must be Type II NTC 10K or 0-10 vdc.
Sensor LED is OFF| CO2 sensor error| Check CO2 sensor connection, sensor signal (under range or over range), and sensor signal type.
Sensor LED is YELLOW| Humidity sensor error| Check humidity sensor connection, sensor signal (under range or over range), and sensor signal type.
Wi-Fi connection failure| Wi-Fi/WLAN stick error or wrong user name and password| Unplug and re-plug in the Wi-Fi/WLAN stick, enter a correct user name and password, restart the controller, or replace the Wi-Fi/WLAN stick. If the Wi-Fi/WLAN stick is POL903.00/100, then the default user name and password are Siemens-WLAN-Stick and SIBPAdmin. DNS name is siemens.wlanstick. Contact Application Engineering for information on this accessory.

NOTE(S):
a. Back up configurations before firmware update. All the previous configuration data is erased after firmware update. Contact Application Engineering for more information on support for firmware.
IMPORTANT: If the controller enters the configuration state for the convenience of I/O configurations, then users can manually switch to the running state after finishing configurations. To do so, press Enter + Up at the same time, then press Enter to confirm the switch after 8RUN STATE appears on the LCD.

Controller Options
LOW AMBIENT
If the unit comes with Electro-Mechanical (EM) control, then no adjustment is necessary.
Smoke Detectors
Smoke detectors are available as factory-installed options on 50FCQ models. Smoke detectors may be specified for Supply Air only or for Return Air without or with economizer, or in combination of Supply Air and Return Air. Return Air smoke detectors are arranged for vertical return configurations only. All components necessary for operation are factory-provided and mounted. The unit is factory-configured for immediate smoke detector shutdown operation; additional wiring or modifications to unit terminal board may be necessary to complete the unit and smoke detector configuration to meet project requirements.
Units equipped with factory-optional Return Air smoke detectors require a relocation of the sensor module at unit installation. See Fig. 57 for the as- shipped location. COMPLETING RETURN AIR SMOKE SENSOR INSTALLATION

1. Unscrew the two screws holding the Return Air Smoke Detector assembly. See Fig. 58, Step 1. Save the screws.
2. Turn the assembly 90 degrees and then rotate end to end. Make sure that the elbow fitting is pointing down. See Fig. 58, Step 2.
3. Screw the sensor and detector plate into its operating position using screws from Step 1. See Fig. 58, Step 3.
4. Connect the flexible tube on the sampling inlet to the sampling tube on the basepan.

ADDITIONAL APPLICATION DATA
Refer to the application data document “Factory Installed Smoke Detectors for Small and Medium Rooftop Units 2 to 25 Tons” for discussions on additional control features of these smoke detectors including multiple unit coordination.
Step 11 — Adjust Factory-Installed Options
SMOKE DETECTORS
Smoke detector(s) will be connected at the Unit Control Board (UCB), at terminals marked “Smoke Shutdown.” Detach the jumper covering the Smoke Shutdown terminals on the UCB and then attach the wiring harness from the smoke detector.
ECONOMIZERONE OCCUPANCY SWITCH
External occupancy control is managed through a connection on the Unit Control Board.
If external occupancy control is desired, connect a time clock or remotely controlled switch (closed for Occupied, open for Unoccupied sequence) at terminals marked OCCUPANCY. Detach the jumper covering the “Occupancy” terminals on the UCB and then
attach the required connections.
Step 12 — Install Accessories
Available accessories include:

• Roof curb
• Thru-base connection kit (must be installed before unit is set on curb)
• Manual outside air damper
• Two-Position motorized outside air damper
• EconomizerONE (with POL224 control)
• Power exhaust
• Differential dry-bulb sensor (EconomizerONE)
• Outdoor enthalpy sensor
• Differential enthalpy sensor
• Electric heaters
• Single point kits
• Low Ambient Controls
• Thermostat / Sensors
• CO2 sensor
• Louvered hail guard
• Phase monitor control

Refer to separate installation instructions for information on installing these accessories. Step 13 — Fan Speed Set Up
UNITS WITH ELECTRO-MECHANICAL CONTROLS
The Fan Speed set up controls are located on the lower section of the Unit Control Board (UCB). Refer to Fig. 59 for location.

1. Check the job specifications for the cfm (cubic feet per minute) and ESP (external static pressure) required.

2. Using the chart on the Fan Speed Set Up labels (see Fig. 60), calculate the vdc from the cfm and ESP for the base unit plus any field accessories (as listed on the label).
   NOTE: The Fan Speed Set Up labels are located on the High Voltage cover in the Control Box.

3. Connect a multimeter to the vdc terminals on the UCB.

4. Set the Range Switch to either A, B, or C per the Switch Range table.

5. Using a straight blade screwdriver turn the vdc control dial to fine tune the vdc reading.

6. Record the reading in the Field Setting field.

Typical Unit Piping
Each heat pump system includes two compressors, a reversing valve, dual- function outdoor and indoor coils, a common liquid line with bi-flow TXV, and dedicated cooling and heating TXVs.
549K07 and 08 unit outdoor coils contain a vapor header check valve. 549K09 unit indoor coils contain a vapor header check valve. See Fig. 61-66 and Tables 28-33 for typical unit piping schematic parallel coil circuits during evaporator-function operation and converging coil circuits during the condenser-function operation.
*Table 28 — 549K07-08 — Cooling Mode**

*Table 29 — 549K07-08 — Heating Mode**

*Table 30 — 549K07-08 — Defrost Mode**

*Table 31 — 549K09 — Cooling Mode**

*Table 32 — 549K09 — Heating Mode**

*Table 33 — 549K09 — Defrost Mode**

Pre-Start and Start-Up
This completes the mechanical installation of the unit. Refer to the unit’s Service Manual for detailed Pre-Start and Start-Up instructions. Download the latest versions from HVAC Partners (www.hvacpartners.com).
START-UP CHECKLIST
549K 07-09 Single Package Rooftop Heat Pump Units (Remove and use for job file)
NOTE: To avoid injury to personnel and damage to equipment or property when completing the procedures listed in this start-up checklist, use good judgment, follow safe practices, and adhere to the safety considerations/information as outlined in preceding sections of this Installation Instruction document.
I. PRELIMINARY INFORMATION
MODEL NO ____
JOB NAME
SERIAL NO ____
ADDRESS
START-UP DATE____
TECHNICIAN NAME ___
ADDITIONAL ACCESSORIES _
II. PRE-START-UP
Verify that all packaging materials have been removed from unit (Y/N)
Verify installation of outdoor air hood (Y/N)
Verify that condensate connection is installed per instructions (Y/N)
Verify that all electrical connections and terminals are tight (Y/N)
Check that indoor-air filters are clean and in place (Y/N)
Check that outdoor air inlet screens are in place (Y/N)
Verify that unit is level (Y/N) _____
Verify that fan assembly is free of obstructions and rotor spins freely (Y/N)

Verify that scroll compressors are rotating in the correct direction (Y/N)

Verify installation of thermostat (Y/N)
III. START-UP ELECTRICAL
Supply Voltage L1-L2____ L2-L3 L3-L1
Compressor Amps 1 L1 L2 L3
Compressor Amps 2 L1 L2 L3
Supply Fan Amps L1 L2 L3
Outdoor Fan Amps L1 L2
TEMPERATURES
Outdoor-air Temperature °F DB (Dry Bulb)
Return-air Temperature °F DB °F WB (Wet Bulb)
Cooling Supply Air Temperature ____ °F
PRESSURES
Refrigerant Suction ____ PSIG
Refrigerant Discharge ____ PSIG
Verify Refrigerant Charge using Charging Charts (Y/N)
GENERAL
Economizer minimum vent and changeover settings to job requirements (if equipped) (Y/N)
Verify smoke detector unit shutdown by utilizing magnet test (Y/N)

Manufacturer reserves the right to discontinue, or change at any time
specifications or designs without notice and without incurring obligations.
Catalog No. 04-53549019-01
Printed in U.S.A.
Form No. II549K-7-9-01
Rev. B Pg CL-1 3-24
Replaces: New

References

• HVACpartners

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