McQuay VHC009 Installation Manual

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Installation & Maintenance Manual

Vertical Stack Water Source Heat Pumps

Model VHC Vertical Stack Chassis Model VHF Vertical Stack Cabinet Unit Sizes 009 – 036 / R-410A Refrigerant

IM 986-2

Group: WSHP Part Number: 669646403 Date: May 2012

Page 2 of 48 / IM 986-2

Table of Contents

Model Nomenclature ............................ 4-5

Vertical Stack Model VHF (Cabinet)...............4

Vertical Stack Model VHC (Chassis)...............5

Receiving, Storage & Handling ................... 6-7

Disassembling Upper & Lower Cabinet Sections..... 7-8

Dimensional Data .............................. 9-10

Unit Size 009-018 ..............................9

Unit Size 021-036 .............................10

Pre-Installation Considerations ....................11

Cabinet Configurations...........................12

Typical Framing & Discharge Arrangements.........13

Critical Dimensions ..............................14

Framing Locations to Unit Openings..............14

Vertical Riser Stub-Outs Locations to

Unit Knockouts...............................14

Return Air Grille/Panel Dimensions...............15

Installation Procedure.........................16-26

Risers & Cabinet........................... 16-17

Cleaning & Flushing Water System............ 17-19

Power Wiring From Building to Unit...........19-20

Connect Condensate Drain Hose to Drain Stubout ...20

Water Connections ......................... 20-21

Installing Unit Chassis .........................22

Making Cabinet to Chassis Wiring Connections . . . . . 22

Installing & Wiring the Remote Control Node ......23

Installing the Return Air Grille/Panel..............24

Installing the Discharge Air Diffuser ..............25

Twin Units Installation .........................26

Controls..................................... 27-34

MicroTech III Unit Controller ................... 27

Remote Reset Feature ..........................27

MicroTech III Controller Terminal Locations

& Descriptions ............................ 28-29

I/O Expansion Module .........................30

MicroTech III Controller with Lon Module.........31

MicroTech III Controller with BACnet Module .. 32-33 MicroTech III Controller with Lon Module on

Board Diagram ...............................34

Typical Wiring Diagrams ...................... 35-38

MicroTech III Unit Controller, 2-Speed Fan (Toggle or

Thermostat), PSC Motor 208-230/60Hz/1-Phase,

Unit Sizes 009-018............................35

MicroTech III Unit Controller, 2-Speed Fan (Toggle or

Thermostat), PSC Motor 265-277/60Hz/1-Phase,

Unit Sizes 009-036............................36

MicroTech III Unit Controller, 2-Speed Fan (Toggle or

Thermostat), X13 Motor 208-230/60Hz/1-Phase,

Unit Sizes 021-036............................37

MicroTech III Unit Controller, 2-Speed Fan (Toggle or

Thermostat), X13 Motor 265-277/60Hz/1-Phase,

Unit Sizes 021-036............................38

Start-up........................................39

Additional Accessories (General) ................ 39-43

Thermostats & Temperature Sensors ........... 39-43

Troubleshooting .............................. 44-47

The in and outs of R-410A ......................44

Refrigeration Circuit...........................45

The Water Source Heat Pump Unit ...............46

General Use & Information .....................47

IM 986-2 / Page 3 of 48

Model Nomenclature

Vertical Stack Water Source Heat Pump – Cabinet (VHF)

W VHF 1 009 B E DP LRY F 12 S 088

Product Category

W - WSHP

Product Code

VHF - Cabinet

Design Series

1 2

Unit Size - Tons

009 - 3/4 Ton 012 - 1 Ton 015 - 1-1/4 Ton 018 - 1-1/2 Ton 021 - 1-3/4 Ton 024 - 2 Ton 030 - 2-1/2 Ton 036 - 3 Ton

Controls

B - MicroTech III C - MicroTech III With LonWorks D - MicroTech III With BACnet

Voltage

A - 115/60/1 ph E - 208-230/60/1 ph J - 265-277/60/1 ph

Secondary Drain Pan

GL - Standard Galvanized Steel SS - Stainless Steel

Cabinet Type

080 - 80" Cabinet Height 088 - 88" Cabinet Height 092 - 92" Cabinet Height 096 - 96" Cabinet Height

Filter Option

S - Standard 1" Throwaway P - 2" Pleated (Merv 7) Y - None

Blower Motor

12 - 2-Speed PSC Motor 32 - ECM 2-speed 2.3 Motor 33 - ECM 2-speed X13 Motor

Power Connection

F - Fused Disconnect N - Non-Fused Disconnect H - HACR Breaker

Supply Air Conguration

LYY - Single Supply Outlet, Left Side RYY - Single Supply Outlet, Right Side FYY - Single Supply Outlet, Front Side BYY - Single Back Side Supply Outlet TYY - Single Top Supply Outlet LFY - Double Supply, Left Side and Front Side LRY - Double Supply, Left Side and Right Side LBY - Double Supply, Left Side and Back Side RFY - Double Supply, Right Side and Front Side RBY - Double Supply, Right Side and Back Side BFY - Double Supply, Back Side and Front Side LTY - Double Supply, Left Side and Top RTY - Double Supply, Right Side and Top BTY - Double Supply, Back Side and Top FTY - Double Supply, Front Side and Top LFT - Triple Supply, Left Side, Front Side and Top LRT - Triple Supply, Left Side, Right Side and Top FRT - Triple Supply, Front Side, Right Side and Top FBT - Triple Supply, Front Side, Back Side and Top BRT - Triple Supply, Back Side, Right Side and Top BLT - Triple Supply, Back Side, Left Side and Top YYY - Closed Supply Plenum for eld modication

Page 4 of 48 / IM 986-2

Note: For illustration purposes only. Not all options avail-

able with all models.

Please consult McQuay Sales Representative for

specic availability.

Model Nomenclature

Vertical Stack Water Source Heat Pump – Chassis (VHC)

W VHC 1 012 B E A C AMY C

Product Category

W - WSHP

Product Code

VHC - Chassis

Design Series

1 2

Unit Size - Tons

009 - 3/4 Ton 012 - 1 Ton 015 - 1-1/ 4 Ton 018 - 1-1/2 Ton 021 - 1-3/4 Ton 024 - 2 Ton 030 - 2-1/2 Ton 036 - 3 Ton

Controls

B - MicroTech III C - MicroTech III With L D - MicroTech III With BACnet

onWorks

Voltage

A - 115/60/1 ph E - 208-230/60/1 ph J - 265-277/60/1 ph

Coax Coil Construction

C - Copper Inner - Steel Outer S - CuproNickel Inner - Steel Outer X - Special

Chassis Construction

AYY - Standard Fiberglass Insulation EYY - IAQ - Cellular Insulation AMY - Standard w/Compressor Blanket EMY - IAQ w/Compressor Blanket AYC - Standard w/E-Coated Air Coil EYC - IAQ - Cellular w/E-Coated Air Coil AMC - Standard w/Comp Blanket and Coated Air Coil EMC - IAQ w/Comp Blanket and Coated Air Coil

Motorized 2-Way Isolation Valve

C - 2-Way Motorized 1/2" Iso-Valve, General Close-Off Pressure N.C. (Normally Closed) V - 2-Way Motorized 1/2" Iso-Valve, General Close-Off Pressure N.O. (Normally Open) H - 2-Way Motorized 1/2" Iso-Valve, High Close-Off Pressure N.C. (Normally Closed) D - 2-Way Motorized 3/4" Iso-Valve, General Close-Off Pressure N.C. (Normally Closed) K - 2-Way Motorized 3/4" Iso-Valve, General Close-Off Pressure N.O. (Normally Open) J - 2-Way Motorized 3/4" Iso-Valve, High Close-Off Pressure N.C. (Normally Closed) Y - None X - Special

Refrigerant

A - R-410A X - Special

Note: For illustration purposes only. Not all options

available with all models.

Please consult McQuay Sales Representative

for specic availability.

IM 986-2 / Page 5 of 48

Receiving and Storage

Upon receipt of the equipment, check the carton and pallets for visible damage. Make a notation on the shipper’s delivery ticket before signing. If there is any evidence of rough handling, immediately open the cartons to check for concealed damage. If any damage is found, notify the carrier within 48 hours to establish your claim and request their inspection and a report. The Warranty Claims Department should then be contacted.

IMPORTANT

This product was carefully packed and thoroughly inspected before leaving the factory. Responsibility for its safe delivery was assumed by the carrier upon acceptance of the shipment. Claims for loss or damage sustained in transit must therefore be made upon the carrier as follows:

VISIBLE LOSS OR DAMAGE

Any external evidence of loss or damage must be noted on the freight bill or carrier’s receipt, and signed by the carrier’s agent. Failure to adequately describe such external evidence of loss or damage may result in the carrier’s refusal to honor a damage claim. The form required to le such a claim will be supplied by the carrier.

CONCEALED LOSS OR DAMAGE

Concealed loss or damage means loss or damage which does not become apparent until the product has been unpacked. The contents may be damaged in transit due to rough handling even though the carton may not show external damages. When the damage is discovered upon unpacking, make a written request for inspection by the carrier’s agent within fteen (15) days of the delivery date and le a claim with the carrier.

Cabinet Skid (4-units per skid)

Never stack cabinets higher than as illustrated in Figure 1 at any time during transportation or storage or damage may occur.

Figure 1: Unit Cabinet Skid as Shipped and Stored

Chassis Skid (4 per skid, stored two skids high)

Never stack chassis´ higher than as illustrated in Figure 2 at any time during transportation or storage or damage

may occur.

Figure 2: Chassis Skids Stacked 2 High Maximum

For storing, each carton is marked with “up” arrows.

Storage and Operating Environment

Temporary storage at the job site must be indoor, completely sheltered from rain, snow, etc. High or low temperatures naturally associated with weather patterns will not harm the units. Excessively high temperatures, 140°F (60°C) and higher, may deteriorate certain plastic materials and cause permanent damage.

Storage Temperature:

-40ºF (-40ºC) to 140ºF (60ºC)

Operating Temperature:

32ºF (0ºC) to 140ºF (60ºC)

Humidity:

10%RH to 90%RH Non-condensing

PCB Material and Flammability Rating:

IPC/ANSI FR or CEM material as required to meet UL

94V-0 ammability rating.

Page 6 of 48 / IM 986-2

Handling

Carefully check items against the bills of lading to verify all crates and cartons have been received. Cabinets and Chassis normally ship four to a pallet.

Carefully inspect all units for shipping damage. Report

damage immediately to the carrier and le a claim.

Check the unit data plate to be sure the unit electrical agrees with the power supply available (Figures 3).

Figure 3: Unit Components & Descriptions - Received as Assembled Cabinet with Chassis Shipped Separate

Unit Data Plate

Stub-out Seals

DO NOT handle units by the riser piping. Riser clamps hold the riser in position; they are not designed to support the cabinet weight. The clamps are removed after the unit is installed.

Unit cabinets are factory assembled and wired and have individual thermostat control capability. They are installed by stacking one unit on top of the other. While installing, prevent dirt and other foreign matter from entering the risers and plugging lines or valves. See "Cleaning & Flushing Water System" on page 16.

General Information

McQuay Vertical Stack units are designed for use in

multiple oor apartments, ofce buildings, hotels,

nursing homes and other similar applications. They

require a minimum amount of oor space and are

designed for multiple discharge arrangement. Installation and maintenance must follow accepted

industry practices as described in the ASHRAE Handbook, the National Electric Code, and other applicable standards. Install this equipment in accordance with regulations of authorities having jurisdiction and with all applicable codes.

WARNING

Installation and maintenance are to be performed by qualied personnel who are familiar with local codes and regulations, and experienced with this type of equipment.

WARNING

The installer must determine and follow all applicable codes and regulations. This equipment presents hazards of electricity, rotating parts, sharp edges, heat and weight. Failure to read and follow these instructions can result in property damage, severe personal injury or death. This equipment must be installed by experienced, trained personnel only.

Chassis

Data Plate

Component Descriptions (Assembled Cabinet)

1. Cabinet assembly complete (without chassis) 1a. Pipe riser sets (inlet, outlet and condensate) 1b. Inner front panel and lter bracket

2. Cooling and heating chassis (shipped separate)

3. Return air grille/panel (accessory)

4. Double-deection diffuser (accessory)

CAUTION

Sharp metal edges are a hazard, use care when servicing to avoid contact with them.

IM 986-2 / Page 7 of 48

Disassembling Upper and Lower Cabinet Sections

The Vertical Stack unit cabinet ships completely assembled. If required, it may be disassembled into two (2) sections (upper-fan/discharge cabinet) and (lower chassis/return air cabinet) to make it easier to handle. To disassemble, do the following.

1. Remove risers (if received attached).

2. Remove the three (bottom row) screws on the back of the unit as shown in Figure 4.

Note: Retain all screws for later use to reassemble unit in reverse order as described in steps 1-7. Number of screws will vary depending on unit size.

3. Carefully lay the unit down on its back and remove the remaining eight (8) screws on the left and right side of the cabinet (Figure 5).

5. Remove the ten (10) screws and lift off the front

panel/lter rack to gain access to the cabinet interior

(Figure 6).

Figure 5: Remove remaining eight (8) screws on the left and right sides of the cabinet

Four (4) screws located on left side of cabinet

Figure 6: Remove the ten (10) screws from the front panel/

lter rack.

6. Locate and remove the six (6) screws located inside the cabinet joining the upper and lower cabinet sections (Figure 7).

Note: Pull the insulaton away from the walls of the cabinet interior to get access to the screws.

7. Separate the lower return air cabinet section from the upper blower/discharge cabinet section (Figure 8).

Figure 4: Remove three (3) screws (bottom row) on the back

of the unit.

Back of Unit

Figure 7: Remove the six (6) screws located on the interior

of the unit.

Return air cabinet section interior

Figure 8: Separate the lower cabinet section from the upper cabinet

Page 8 of 48 / IM 986-2

Three screws (bottom row)

Dimensional Data

Figure 9: Model VHC/VHF – 18" × 18" Cabinet – Size 009-018

Left Side View

Front View

Top View

Dimensions

80" 18.07" 18.11" 37.50" .88" 58.09" 2.38" 3.125" 2" 2" 6.72" 12.4" 7.9" 3.3"

Unit Size

009–018

18" × 18"

Cabinet

A B C D E F G J K L M N P Q

88" 18.07" 18.11" 37.50" .88" 58.09" 2.38" 3.125" 2" 2" 6.72" 12.4" 7.9" 3.3"

92" 18.07" 18.11" 37.50" .88" 58.09" 2.38" 3.125" 2" 2" 6.72" 12.4" 7.9" 3.3"

96" 18.07" 18.11" 37.50" .88" 58.09"

A R S T U V

80" 3" 3" 3.3" 4.5" 4.5"

88" 3" 3" 3.3" 4.5" 4.5"

92" 3" 3" 3.3" 4.5" 4.5"

96" 3" 3" 3.3" 4.5" 4.5"

2.38" 3.125"

Table 1.

Discharge Openings

Unit Size

W H W H W H W H

009 – 012 015 – 018

2" 2" 6.72" 12.4" 7.9" 3.3"

Single Double Triple Single-Top Opening

14" 16" 14" 8" NR NR 12" 12"

14" 16" 14" 8" 14" 8" 12" 12"

NR = Not Recommended

IM 986-2 / Page 9 of 48

Dimensional Data

Figure 10: Model VHC/VHF – 24" × 24" Cabinet – Size 021-036

Front View

Left Side View

Top View

Dimensions

Unit Size

80" 24" 24.04" 37.50" .88" 58.08" 2.38" 4.54" 2" 3" 6.72" 12.13" 7.63" 3.13"

A B C D E F G J K L M N P Q

021–036

88" 24" 24.04" 37.50" .88" 58.08" 2.38" 4.54" 2" 3" 6.72" 12.13" 7.63" 3.13"

24" × 24"

92" 24" 24.04" 37.50" .88" 58.08" 2.38" 4.54" 2" 3" 6.72" 12.13 7.63" 3.13"

Cabinet

96"

A R S T U V

80" 3.09" 3.10" 3.12" 4.50" 4.50"

88" 3.09" 3.10" 3.12" 4.50" 4.50"

92" 3.09" 3.10" 3.12" 4.50" 4.50"

96" 3.09" 3.10" 3.12" 4.50" 4.50"

24" 24.04"

37.50" .88" 58.08"

2.38" 4.54"

2" 3" 6.72" 12.13" 7.63" 3.13"

Table 1.

Discharge Openings

Unit Size

W H W H W H W H

021 – 024 030 – 036

Single Double Triple Single-Top Opening

NR NR 18" 10" 18" 10" 18" 18"

NR NR 18" 14" 18" 10" 18" 18"

NR = Not Recommended

Page 10 of 48 / IM 986-2

Pre-Installation Considerations

1. To prevent damage to equipment, do not operate supplementary heating and cooling during the construction period.

2. Inspect the carton for any specic tagging numbers

indicated by the factory per a request from the installing contractor. At this time the voltage, phase and capacity should be checked against the plans.

3. Check the unit size against the plans to verify that the unit is being installed in the correct location.

4. Before installation, check the available dimensions of the area where the unit is to be installed versus the dimensions of the unit.

5. Note the location and routing of water piping, condensate drain piping, and electrical wiring. The locations of these items are clearly marked on submittal drawings.

6. The installing contractor will nd it benecial

to confer with piping, sheet metal, and electrical foremen before installing any unit.

Figure 11: Typical Side by Side Unit Installation

Note: Check the unit data plate for correct voltage with the plans before installing the equipment.

WARNING

Make sure all electrical ground connections are made in accordance with local code.

WARNING

The contractor shall cover the units to protect the machines during nishing of the building. This is critical while spraying reproong material on bar joists, sandblasting, spray painting and plastering.

For Optimum Unit Performance and to Help Minimize Noise and Vibration

● Adhere to the "Critical Dimensions" for locations of

framing and distances to the cabinet.

● Install a 1/4" thick vibration isolation pad under the

entire footprint of the unit cabinet base.

● Be sure there are no kinks and that the stainless

steel braided hoses do not come in contact with and vibrate on chassis and cause noise.

● Ensure there is no metal-to-metal contact between

return air grille and cabinet and the discharge diffuser and the cabinet, use provided gaskets.

● Air balancing in ducted applications is critical for proper airow at each diffuser.

NOTICE

Top air discharge units will require turning vanes and/or a volume damper for proper air flow and balancing, to minimize turbulence. These components must be field-installed and furnished in accordance with SMACNA guidelines.

IM 986-2 / Page 11 of 48

Cabinet Configurations

Figure 12: Single Side Discharge

Figure 13: Double Side Discharge

Figure 14: Side & T op Discharge (See Notice on page 11) Figure 15: Double Side & Top Discharge (See Notice on page 11)

Figure 16: Top Discharge (See Notice on page 11) Figure 17: Closed Plenum – Field Modication Required

= Return Riser = Supply Riser = Drain = Return Air = Discharge Air = Top Discharge

Page 12 of 48 / IM 986-2

Figure 18: Typical Framing & Discharge Arrangements

Double Side Discharge

= Return Air

= Discharge Air

Typical Ducted Application

NOTICE

Note: All ducted applications require a unit that utilizes an ECM-X13 or ECM 2.3 motor (sizes 021-036). X13 motors are factory set for 2-speeds, 2 and 4 tap. For ducted unit applications only position 1 and 2-speed motor taps should be used. Additionally, static pressure must not exceed 0.40 inch static. See table below.

ECM-X13 Motor CFM - Sizes 021 - 036 External Static Pressure (Ducted Applications)

External Static Pressure, WC" Unit Size Speed

Speed 1

021

024

Speed 2

030

Speed 2

036

Speed 2

Speed 1 Speed 2

Speed 1

0 0.05 0.10 0.15 0.20 0.25 0.30 0.35 0.40

830

770

830

770

1200

1080

1200

1080

820

760

820

760

1180

1060

1180

1060

800

740

800

740

1160

1030

1160

1030

780

720

780

720

1140

1010

1140

1010

770

700

770

700

1120

990

1120

990

760

690

760

690

1100

970

1100

970

730

660

730

660

1080

950

1080

950

850

780

850

780

1230

1100

1230

1100

710

640

710

640

1060

930

1060

930

IM 986-2 / Page 13 of 48

Critical Dimensions

Location of studs is critical for proper installation and

t up and can help to reduce unit noise due to vibration

when properly installed.

Figure 19: Framing Locations to Unit Openings

Note: If the unit cabinet was shipped without risers attached it will be necessary to remove the appropriate riser knockouts prior to positioning the cabinet and connecting to the riser stub outs.

Figure 20: Vertical Riser Stub-Outs Locations to Unit Knockouts

Unit Size 021-036 = 4.54" Unit Size 009-018 = 3.125"

1/2" Conduit Fitting for Electrical Supply

Unit Front Return Air

Table 1: Reference Locations for Framing

Framing Locations

Unit Size

80" 18" 2.07" 6" 22.25" 58.75" 61" 79" 3.125" 3.125"

18" × 18"

92" 18" 2.07" 6" 22.25" 58.75" 73" 91" 3.125" 3.125"

96" 18" 2.07" 6" 22.25" 58.75" 77" 95" 3.125" 3.125"

80" 24" 2.125" 6" 28.25" 59.5" 63" 79" 4.54" 3.125"

24" × 24"

92" 24" 2.125" 6" 28.25" 59.5" 75" 91" 4.54" 3.125"

96" 24" 2.125" 6" 28.25" 59.5" 79" 95" 4.54" 3.125"

Dimension includes approximately 1/4" for vibration isolation pad

Dimension “E” ± 0.125

Dimension “G” will vary based on diffuser size. Refer to Table 2, Discharge Knockout Openings on page 16.

Dimension “H” will vary based on cabinet height selected.

88" 18" 2.07" 6" 22.25" 58.75" 69" 87" 3.125" 3.125"

88" 24" 2.125" 6" 28.25" 59.5" 71" 87" 4.54" 3.125"

Dimensions do not include 1/4" vibration isolation pad

1, 3

1, 4

J K L M N

58.08"

37.50"

2.38"

3.3" 7.9" 12.4"

3.13" 7.63" 12.13"

Page 14 of 48 / IM 986-2

Critical Dimensions

Return Air Grille/Panel Dimensions

Location of studs in relation to the unit and the return air grille panel are critical for proper installation and

t up. When installed, the return air grille gasket must

compress and seal completely against the outer edge of

the cabinet and around the inner front panel and lter

bracket. See page 24, “Installing The Return Air/Grill

Panel” and page 14, gure 19 “Framing Locations to

Unit Openings”.

Figure 21: Unit Sizes 009 - 018 (18" x 18" Cabinet)

Figure 22: Unit Sizes 021 - 036 (24" x 24" Cabinet)

IM 986-2 / Page 15 of 48

Installation Procedure

CAUTION

Installation and maintenance is to be performed only by qualied personnel who are familiar with, and in compliance with state, local and national codes and regulations, and experienced with this type of equipment. Sharp edges and coil surfaces are potential injury hazards. Avoid contact with them.

Note: Refer to "Critical Dimensions", page 14 to determine the correct recess depth from the front of the unit to the drywall face. When the installation is complete, the return air grille/panel frame must meet to seal with the cabinet discharge opening and the discharge air diffuser duct must meet and seal with the discharge opening.

Risers and Cabinet

1. Position the cabinet and risers within the building

pipe chase and align with the unit on the oor above

and/or below (Figure 23).

Figure 23: Position the Cabinet and Risers

Riser Couplings Connect to Risers on Unit Above

Inlet, Outlet and Condensate Risers

2. Using the riser extensions, make preliminary riser connections between the units above and or below to assure proper riser alignment (supply, return and

condensate). See gure 20 on page 14.

3. After all components are aligned properly, anchor

the unit cabinet to the oor using the McQuay

provided mounting brackets (Figure 24).

4. Locate the two (2) mounting brackets in the parts bag and position them near the back corners of the unit, or one on a side and one on the back, whichever location or combination is most suitable,

as illustrated in gure 24. Cut away an area of the

1/4" isolation pad at the mounting bracket locations. Contractor is responsible for the appropriate

fasteners to secure the brackets to the oor, as local

codes dictate.

Figure 24: Position the Cabinet for Securing to the Floor with Mounting Brackets (2)

Stud Wall Floor Plate and Finish Wall Location

Risers Through Floor Opening

1/4" Isolation Pad

Riser Extensions Align and Connect to Couplings and Unit Above

IMPORTANT

A eld-supplied ¼” thick isolation pad should be installed now (Figure 23).

IMPORTANT

The cabinet must be centered between the wall studs and plumb vertically for the grille/panel frame and diffuser to properly align and seal to the cabinet. Use of a 4' level is recommended.

1/4" Vibration

Isolation Pad

Unit Cabinet 3

Finished Wall

Unit Front

" from Finished Wall

Back of

Unit

Provided Mounting

Brackets (2)

Fasteners (by others)

Stud Wall Floor Plate

Page 16 of 48 / IM 986-2

Note: Be sure that each riser stub-out (supply & return) are centered within the riser knockout in the cabinet (Figure 25). If there is a void between the stub-out and the stub-out seal on the cabinet interior, this indicates that the stub-out is not properly centered within the knockout.

Figure 25: Center the Riser Stub-Outs in the Knockouts and within Seals on the Cabinet Interior

Knockouts on Cabinet Exterior

Riser Knockouts

WARNING

Before furring-in units, hydrostatically test the risers and unit connection joints in accordance with local building codes, to make sure they are leak-proof.

Note: Perform "Cleaning and Flushing Water System" Procedure Below.

CAUTION

When furring-in units make sure that no screws or nails penetrate the unit cabinet.

8. Layout the stud wall oor plates and frame-in

unit referencing “T ypical Framing & Dischar ge Arrangements” on page 13 and “Critical Dimensions” on page 14 and table 1.

Note: Before cutting and hanging drywall, remove the appropriate discharge air opening knockout. See T able 2). Protect unit from construction debris with a protective cover.

Cabinet Interior

Stub-Out Connections with Valves Centered within Knockouts and Seals

Stub-Outs Seals

CAUTION

The unit is not designed to support the weight of the risers. Anchor them securely to the building structure.

5. Anchor risers to the building structure to prevent vertical riser movement greater than, plus or minus one inch to allow for riser expansion or contraction.

Table 2: Discharge Knockout Openings

Unit Size

W H W H W H W H

009–012 015–018

021–024 NR NR 18" 14" 18" 10" 18" 18"

030–036 NR NR

NR = Not Recommended

Single Double Triple Single-Top Opening

14" 16" 14" 8" NR NR 12" 12"

14" 16" 14" 8"

Discharge Openings

14" 8"

18" 14" 18" 10" 18" 18

12" 12"

Cleaning and Flushing Water System

CAUTION

Prior to first operation of any unit, the water circulating system must be cleaned and flushed of all construction dirt and debris or damage will occur.

1. Prior to rst operation of any unit, the water circulating system must be cleaned and ushed of all

construction dirt and debris.

If the units are equipped with water shutoff valves,

either electric or pressure operated, the supply and return runouts must be connected together at each unit location. This will prevent the introduction of dirt into the unit (Figure 26).

6. Solder all supply and return riser connections to units above and/or below.

7. Remove riser ties used to secure the risers to the cabinet during shipping.

IM 986-2 / Page 17 of 48

Figure 26: Connections for ushing system piping

Adapter, MPT x Straight Pipe Thread included with flexible hoses Note: Use for making connections to the supply & return valves for the "Cleaning and Flushing Water System" procedure.

2. Fill the system at the city water makeup connection

with all air vents open. After lling, close all air vents.

The contractor should start main circulator with

the pressure reducing valve open. Check vents in sequence to bleed off any trapped air, ensuring circulation through all components of the system.

Power to the heat rejector unit should be off, and the

supplementary heat control set at 80°F (27°C).

While circulating water, the contractor should check

and repair any leaks in the unit and surrounding piping. Drains at the lowest point(s) in the system

should be opened for initial ush and blow-down, making sure city water ll valves are set to make up

water at the same rate. Check the pressure gauge at pump suction and manually adjust the makeup to hold the same positive steady pressure both before and after opening the drain valves. Flush should continue for at least two hours or longer until the drain water is clean and clear.

Once the system has been lled with clean water and

antifreeze (if used), precautions should be taken to protect the system from dirty water conditions.

NOTICE

It is not McQuay International’s policy to make recommendations on water treatment. However, the general contractor or owner should contact a local water treatment company regarding water treatment. A fouled closed loop water system will lead to premature component failure.

Note: Contact a local water treatment company to

conrm water clarity prior to unit operation.

Dirty water will result in system wide degradation

of performance and solids may clog system-wide

valves, strainers, ow regulators, etc. Additionally,

the heat exchanger may become clogged which reduces compressor service life or causes premature failure.

6. Set the loop water controller heat add setpoint to 70°F (21°C) and the heat rejection setpoint to 85°F (29°C). Supply power to all motors and start

the circulating pumps. After full ow has been

established through all components including the heat rejector (regardless of season) and the vented air and loop temperatures have been stabilized, each of the units will be ready for check, test and start-up, air balancing, and water balancing.

Table 3: Air Limits

Cooling Heating Cooling Heating

Min. Ambient Air 50°F/10°C 50°F/10°C 40°F/5°C 40°F/5°C Normal Ambient Air 80°F/27°C 70°F/21°C 80°F/27°C 70°F/21°C Max. Ambient Air 100°F/38°C 85°F/29°C 100°F/38°C 85˚F/29°C Min. Entering. Air  50°F/10°C 50°F/10°C 50°F/10°C 40°F/5°C Normal Entering Air, 80°F/67°F 70°F 80°F/67°F 70°F db/wb 27/19°C 21°C 27/19°C 21°C Max. Entering Air 100/83°F 80°F 100/83°F 80°C

db/wb  38/28°C 27°C 38/28°C 27°C

Standard Range Geothermal Range

Units Units

3. Shut off supplemental heater and circulator pump and open all drains and vents to completely drain down the system. Short circuited supply and return runouts should now be connected to the unit supply and return connections. Do not use sealers at the

swivel are connections of hoses.

4. Flush system with water for 2 hours or longer until water is clean.

5. Rell the system with clean water. Test the water

using litmus paper for acidity, and treat as required to leave the water slightly alkaline (pH 7.5 to 8.5).

The specied percentage of antifreeze may also be

added at this time. Use commercial grade antifreeze designed for HVAC systems only. Do not use automotive grade antifreeze (See Table 5 on page 19 for Antifreeze Correction Factors).

Page 18 of 48 / IM 986-2

Table 4: Water Limits

Standard Range Geothermal Range Units Units Cooling Heating Cooling Heating

Min. Entering. Water  55°F/13°C 55°F/13°C 30°F/-1°C 20°F/-6°C Normal Entering. Water 85°F/29˚C 70˚F/21°C 77°F/25˚C 40˚F/5°C Max. Entering. Water  110°F/43°C 90°F/32°C 110°F/43°C 90°F/32°C

At ARI flow rate.

Maximum and minimum values may not be combined. If one value



is at maximum or minimum, the other two conditions may not exceed the normal condition for standard units. Extended range units may combine any two maximum or minimum conditions, but not more than two, with all other conditions being normal conditions.

CAUTION

Units must be checked for water leaks upon initial water system start-up. Water leaks may be a result of mishandling or damage during shipping. Failure by the installing contractor to check for leaks upon start-up of the water system could result in property damage.

Table 5: Antifreeze Correction Factors

Ethylene Glycol

Cooling Capacity 0.9950 0.9920 0.9870 0.9830 0.9790 Heating Capacity 0.9910 0.9820 0.9770 0.9690 0.9610 Pressure Drop 1.0700 1.1300 1.1800 1.2600 1.2800

10% 20% 30% 40% 50%

Propylene Glycol

Cooling Capacity 0.9900 0.9800 0.9700 0.9600 0.9500 Heating Capacity 0.9870 0.9750 0.9620 0.9420 0.9300 Pressure Drop 1.0700 1.1500 1.2500 1.3700 1.4200

10% 20% 30% 40% 50%

Methanol

10% 20% 30% 40% 50%

Cooling Capacity 0.9980 0.9720 – – –

Heating Capacity 0.9950 0.9700 – – – Pressure Drop 1.0230 1.0570 – – –

Ethanol 10% 20% 30% 40% 50%

Cooling Capacity 0.9910 0.9510 – – – Heating Capacity 0.9950 0.9600 – – – Pressure Drop 1.0350 0.9600 – – –

Power Wiring From Building to Unit

DANGER

To avoid electrical shock, personal injury or death:

1. Installer must be qualied, experienced technician.

2. Disconnect power supply before installation to prevent electrical shock and damage to equipment.

1. Locate the electrical power supply wiring from the building and feed wiring through the 1/2" conduit

tting (strain relief) on the unit as shown in Figure

27 & 28, following local electrical codes and regulations.

Figure 27: Supply Electric Wiring from Building to Unit

1/2" Knockout for Supply Wiring

Figure 28: Wire to Unit Switch

2. If a remote wall-mounted thermostat is being used, install a 24-volt thermostat wiring cable with at least 6 wires from the unit low voltage terminal strip (Figure 29) to the thermostat location.

Flexible Metal Conduit & Strain Relief

3. If a wireless remote thermostat was ordered to control the unit, it is recommended that the Remote Control Node (RCN) be installed now.

IM 986-2 / Page 19 of 48

Figure 29: Low V oltage Terminal Strip for Thermostat Wiring

2-Speed Fan Switch

Thermostat Low Voltage Terminal Strip

Note: See specic thermostat installation manual

for wiring and operation of thermostat. Install wall mounted thermostat while completing dry wall

installation.

Connect Condensate Drain Hose to Drain Stub Out

1. Remove the two (2) screws located along the back edge of the drain pan, holding it in place (Figure 30).

Water Connections

All piping connections should be made using good plumbing practices and in accordance with any and all local codes that may apply.

Unit Piping Connection

Unit sizes 009 through 018 coil connections are gooseneck style, made of copper tubing with 1/2" FPT. Unit sizes 021 through 036 have 3/4" FPT connections (Figure 31).

Shutoff/Balancing Valve

Each heat pump requires a shutoff valve on both the supply and return risers for easy serviceability and removal of the chassis when necessary. We suggest using a factory installed 2-way motorized isolation valve on the return line of the chassis and a Auto Flow Regulator (AFR) installed on the supply line

which allows proper water ow in a given size unit.

Each valve package has 1/2" FPT or 3/4" FPT threaded connections (Figure 32).

Figure 31: Typical Motorized Valve Piping

2. Adjust the direction of the condensate drain hose and slip it over the drain stub out. Using the provided clamp, secure the hose by tightening the clamp.

3. Reinstall the secondary drain pan with the two (2) screws removed in step 1.

Figure 30: Connect Drain Hose to Drain Stub Out

Two (2) Screws Holding

Pan in Place

Drain

Stub Out

Hose Clamp

FPT Return

Connection

2-Way Motorized Valve

FPT Supply

Auto Flow Regulator

Connection

Adding A Motorized Valve & Auto Flow Regulator

The Vertical stack water source heat pump chassis can

be congured with a 2-way motorized valve. The 2-way

motorized valve is mounted on the return line of each unit and the Auto Flow Regulator (AFR) is mounted to the supply line. Valve assemblies terminate with either a 1/2" (unit sizes 009-018) or 3/4" (unit sizes 021-036) NPT threaded connection and will accommodate factory supplied hoses.

Page 20 of 48 / IM 986-2

Make Flexible Hose Connections to the Supply and Return Valves From Riser

Stub-Outs

1. Using the specied supply and return hoses make

supply and return hose connections to the riser stubouts (Figure 32).

Note: The MPT straight pipe adapters can be

removed from the swivel end of the exible hoses

now and threaded onto the chassis FPT supply and return pipe connections (Figure 33). This will make hose connections to the chassis easier when the chassis is partially installed.

Note: To complete the exible hose connections

to the chassis, only partially install the chassis

into the cabinet as shown on page 22, gure 35

“Installing Unit Chassis”.

Important When Handling Chassis

Note: If using a hand truck to move chassis, tip the chassis forward or back only, pivoting on the ends of the chassis rails. Tipping and pivoting the chassis side to side on the long edge of the rails will damage the rails and the rubber vibration isolators.

CAUTION

2. Attach the (MPT) xed hose ends to the female

connections on the valves. Using two crescent wrenches, one to hold the valve pipe connection and the second on the hose end, tighten the connections.

Figure 32: Make supply and return hose connections to the valves from the riser stub-outs

Flexible Hose

2-Position Hand Valve

Slots in the chassis rails that may be used as hand holds have sharp metal edges. To avoid personal injury, heavy protective gloves should be used while moving and lifting the unit chassis.

Figure 34: Tip Chassis Front to Back Only, Pivoting on the Ends of the Rails

Do not tilt chassis side to side on long edge of rails or damage will occur

Tilt chassis front to back on end of rails when handling and moving

Figure 33: Flexible Return and Supply Hoses (Field-installed)

Assembled Length

Fixed End, MPT

Female Swivel

Adapter, MPT x Straight Pipe Thread Note: Connects to the chassis FPT supply & return connections.

IM 986-2 / Page 21 of 48

Installing Unit Chassis

1. Thread the MPT adapters removed from the swivel

ends of the exible hoses onto the chassis FPT

supply and return pipe connections. Using two crescent wrenches, one to hold the chassis pipe

connection and the second on the adapter tting,

tighten the connections.

2. Install the chassis by sliding it into the cabinet opening until the chassis support rails sit on the cabinet rails. Slide the chassis into the cabinet until there is approximately a 10" space between the chassis coil and the cabinet. This will allow

adequate clearance to connect the exible hoses to

the chassis coil. For safety, place a 6" high block under the chassis rails to support the chassis as shown in Figure 35.

Figure 35: Slide chassis partially into the unit cabinet

Approximately 10" gap to make hose connections

Figure 36: Slide Chassis into Cabinet Leaving a 10" Gap for Clearance to Make Flexible Hose Connections

Supply

Connection

Return Connection

Making Cabinet to Chassis Wiring Connections

6" high blocks to support chassis

2. Thread the female swivel ends of the hoses on to the water supply and return connections. Using two crescent wrenches, one to hold the straight MPT

adapter and the second on the exible hose swivel,

tighten the connections. (Figure 36).

1. Locate the wires and plugs in the upper fan section of the unit that connect to the unit chassis.

2. Plug in the wires from the top cabinet section into the proper molex connectors on the chassis (Figure 37).

Figure 37: Plug unit component wiring from the top cabinet section into the proper connectors on the chassis (Unit Size 021-036 Chassis Shown)

Main Power Connector Note: On unit sizes

009-018 the Main Power Receptacle and Thermostat Connector locations are switched

Fan Control

Connector

Thermostat Wiring

Connector

2. Push the chassis into the cabinet until it makes contact with the stops on the rails at the rear of the cabinet.

Page 22 of 48 / IM 986-2

Note: Be sure there are no kinks and that the stainless steel braided hoses do not come in contact with and vibrate on chassis and cause noise. Also be sure not to pinch wires between cabinet and chassis when inserting chassis.

Installing the (Optional) Remote Control Node (RCN) For Use With The Optional Wireless Thermostat

DANGER

Disconnect all electrical power before servicing unit. Electrical shock will cause severe injury or death.

Figure 39: Connect Wires to the RCN Terminals and snap the plastic standoffs onto Board

Plastic Standoffs (4)

Remote Control Node (RCN)

1. Remove the panel with the low voltage terminal strip by removing two (2) screws at the front of the cover and three (3) located on the underside. (Figure

38). The wires connected to the manual fan speed switch may be removed for easier access.

Note: There are two methods for installing the RCN to the unit. The RCN mounts on the back of the bezel (blank control pad) and this assembly snaps into the knockout on the face of the unit. This method is not recommended since future replacement is

more difcult. The preferred method for a new unit

installation is illustrated below (Figures 38 – 40).

Figure 38: Remove the Cover Plate with the Low Voltage Terminal Strip

Terminals on Back of Low Voltage Terminal Strip

RCN Terminals

3. Snap the plastic standoffs into the RCN as illustrated in Figure 39.

4. Reach inside the area behind the removed terminal strip cover and up behind the knockout. Align the standoffs on the board with the provided standoff holes on the knockout plate and snap the standoffs into the holes (Figure 40).

Figure 40: Secure the RCN to the Unit with the Standoffs

2. Connect the provided wiring to the RCN terminals as shown in Figure 39.

Plastic Standoffs (4)

RCN

RCN to Low Voltage Terminal Connectors

5. Connect the RCN wires with connectors to the low voltage terminals and reinstall the terminal strip cover.

IM 986-2 / Page 23 of 48

Installing The Return Air Grille/Panel

1. Install the return air grille/panel assembly (Figure

41). Center, level and plumb the frame inside the framed opening. Push the assembly into the opening until the gaskets compress against the cabinet, and

the frame face is tight to the nished wall.

Note: Shims should be used to make up the space between the studs and the panel frame at the locations of the fasteners on the panel frame (4). Adhere them to the panel frame to keep them in place (Figure 41).

Figure 41: Installing the Panel Door Frame

Note: Be sure the bottom ange of the door frame

slides beneath the cabinet ange, as shown in Figure

41. This seal must compress between the bottom

panel ange and the bottom cabinet ange when

the installation of the panel door frame is complete.

2. Check that the panel door frame is centered within the opening and seals completely to the cabinet

return air opening. Also conrm that the room side ange of the frame is level, plumb and rmly

against the drywall. Secure the hinged panel door frame with the 4 screws provided.

Seal Gasket on the Back of the Panel Door Frame along top and two sides

Shims to Make Up Space Between Framed Opening and Panel Door Frame

Door Panel Bottom

Flange to Slide Beneath Cabinet Flange

Seal Gasket on Underside of Cabinet Flange. Door Panel Flange Slides Underneath and Compresses to Cabinet

Page 24 of 48 / IM 986-2

Installing The Discharge Air Diffuser

1. Adhere eld-provided 1/2" foam seal to the face of

the cabinet around the perimeter of the discharge air opening (Figure 42).

3. Push the diffuser frame in until it compresses against the foam seal and the room side frame is

ush against the drywall. Be sure the diffuser frame

is level and plumb and secure it with the two (2) screws provided.

2. Insert the diffuser into the wall opening and align the frame with the foam seal.

Note: To avoid bending the adjustable discharge louvers do not press on them

Figure 42: Installing the Discharge Air Diffuser

Foam seal applied to the cabinet face, around perimeter of discharge

air opening

Note: When installed correctly the diffuser frame should seal to the cabinet discharge air opening and no discharge air will be lost between the unit and the wall cavity.

Foam seal (field-furnished & installed)

Diffuser flange compresses into the foam seal

Double-deflection Diffuser

IM 986-2 / Page 25 of 48

Twin Units Installation

Twin opposite hand units share a common riser system; i.e., supply, return, and drain riser. This is commonly called a “master/secondary” arrangement. The master unit is shipped with the risers attached. These special risers have stub-outs for both the master unit and the

secondary unit which must be eld connected and the

following procedures must be followed for all twin unit installations.

1. Secondary units ship without risers and share common risers with the master unit. Knockout holes on the cabinet are provided for the 6" stub outs to make piping connections to the coil supply and return and the condensate drain.

Figure 43: Twin Unit Arrangement (Side by Side)

2. Master units are offered in two-pipe systems with either right-hand or left-hand connections.

Secondary units are offered to accommodate internal connections to any of these riser systems or locations.

3. The riser location (right or left) is determined by facing the return air grille panel. The risers are located on either the right or left of the unit. This

denes the riser location. See Unit Congurations

on page 12.

4. The riser block-off plates are located in the base of the secondary unit. Block-offs must be installed on the secondary unit before putting it into position.

Master Unit

Secondary Unit in Adjoining Room

6" Stubs on Master Unit Risers for Secondary Unit

Stud Wall Separating Rooms

Common

Risers

Page 26 of 48 / IM 986-2

MicroTech® III Unit Controller

The MicroTech III Unit Controller includes built-in features such as random start, compressor time delay,

shutdown, condensate overow protection, defrost

cycle, brownout, and LED/fault outputs. Table 6 shows the LED and fault output sequences.

The unit has been designed for operation with either a unit mounted thermostat or a microelectronic wall thermostat, selected by the manufacturer. Do not operate the unit with any other type of wall thermostat.

Each unit has a printed circuit board control system. The low voltage output from the low voltage terminal strip is AC voltage to the wall thermostat. R is A/C voltage output to the wall stat.

The 24 volt low voltage terminal strip is set up so R-G energizes the fan only. R-Y1 energizes the compressor for cooling operation, R-W1 energizes the compressor and reversing valve for heating operation. The reversing valve is energized in the heating mode. The circuit board has a fan interlock circuit to energize the fan whenever the compressor is on if the thermostat logic fails to do so.

The output to the wall stat is AC current. Terminal (R) on the wall stat can be connected to terminal (R) on the PC board for AC voltage.

R = AC current R to G = fan only R to Y1 = cooling R to W1 = heat

The MicroTech III unit controller has a lockout circuit to stop compressor operation if any one of its safety devices is triggered (high pressure switch and low temperature sensor). If the low temperature sensor is triggered, the unit will go into the cooling mode for 60 seconds to defrost any slush in the water-to-refrigerant heat exchanger. After 60 seconds the compressor is

locked out. If the condensate sensor detects a lled drain

pan, the compressor operation will be suspended only in the cooling mode. The unit is reset by opening and closing the disconnect switch on the main power supply to the unit in the event the unit compressor operation has been suspended due to low temperature sensor or high pressure switch. The unit does not have to be reset

on a condensate overow detection.

The MicroTech III unit controller fault output sends a signal to an LED on a wall thermostat. Table 6 shows for which functions the fault output is “on” (sending a signal to the LED).

Table 6: MicroTech III unit controller LED & fault outputs

Mode / Fault

Occupied, Bypass, Standby, or Tenant Off On Off Energized Override Unoccupied On On Off Energized Condensate Overow On Off Off De-engergized

High Pressure 1 Fault Off Off Flash De-energized Low Pressure 1 Fault Off Off On De-energized Low Temperature 1 Fault Flash Off Off De-energized

Brownout

Emergency Shutdown Off Flash Off De-energized

Room/Return Air or Low Temp Sensor 1 Failure

Service Test Mode

Corrupted

Received

Enabled

Serial EEPROM

Network “Ofine”

Compressor relay/compressor terminal is labeled COMP, switched line of the

same electric input as any of the L1 terminals.

Yellow Green Red

Flash Flash On De-engergized

Status LED’s Thermostat Alarm Light

Off Flash Off De-energized

On On Off De-energized

On On On De-energized

Off Off Off De-enegized

Output-Terminal “A”

Remote Reset Feature

The Remote Reset feature provides the means to remotely reset automatic lockouts generated by highpressure and/or low-temperature (in heating) faults. When the MicroTech III unit controller is in automatic lockout due to one of these faults, and the cause of the fault condition has been alleviated, energizing the O-terminal for 10 seconds or more will force the MicroTech III unit controller to clear the lockout. A unit power cycle can also be used to clear an automatic lockout if the conditions causing the fault have been alleviated.

The Intelligent reset feature helps to minimize nuisance trips of automatic reset lockouts caused by highpressure and/or low-temperature (in heating) faults. This

feature clears faults the rst two times they occur within

a 24-hour period and triggers an automatic lockout on the 3rd fault. The retry count is reset to zero every 24 hours.

The MicroTech III unit controller has built-in night setback operation. A “grounded’ signal to the “U” terminal on TB3 of the unit control puts the unit into the unoccupied mode for night setback operation. Fan operation terminates and unit control will only respond to signal at the W2 terminal. Daytime heating and cooling operation is locked out. +24VAC to W2 energizes the compressor and reversing valve for heating operation. Night setback operation can be overridden for two hours by energizing the O on the TB2 terminal of the unit control for 3 seconds. Day thermostat setpoints then control the heating and cooling operation. The MicroTech III unit controller also accommodates shutdown operation on receipt of a “grounded” signal to the “E” input, respectively, on TB3 input terminal of the unit control.

IM 986-2 / Page 27 of 48

MicroTech® III Unit Controller Terminal Locations and Descriptions

H1 - 1 24 24 VAC Power Input

H1 - 2 C 24 VAC Common

H2 - 1 SL1 Fan Output - Switched L1

H2 - 2 Blank Terminal

H2 - 3 N Fan Neutral

H3 - 1 HP1-1 High Pressure Switch 1 Input Terminal 1

H3 -2 HP1-2 High Pressure Switch 1 Input Terminal 2

H4 - 1 Discharge Air Temp Common

H4 - 2 Discharge Air Temp Signal

H4 - 3 Leaving Water Temp Common

H4 - 4 Leaving Water Temp Signal

H5 - 1 1 I/O Exp Module Common (Gnd)

H5 - 2 I/O Exp Module Common (Gnd)

H5 - 3 I/O Exp Module +5 VDC

H5 - 4 I/O Exp Module SPI CE1

H5 - 5 I/O Exp Module SPI CLK

H5 - 6 I/O Exp Module SPI OUT

H5 - 7 I/O Exp Module SPI IN

H5 - 8 I/O Exp Module +12 VDC

H5 - 9 I/O Exp Module 24 VAC

H5 - 10 I/O Exp Module 24 VAC

H5 - 11 Spare

H5 - 12 Spare

H6 - 1 1 Condensate Overow Signal Input

H6 - 2 Low Temp 1 Sensor Common

H6 - 3 Low Temp 1 Sensor Signal

H6 - 4 Low Pressure Switch 1 Source Voltage

H6 - 5 Low Pressure Switch 1 Signal

H6 - 6 Reversing Valve 1 Common

H6 - 7 Reversing Valve 1 Output

H7 - 1 1 Dummy Terminal

H7 - 2 Dummy Terminal

H7 - 3 Red LED Output

H7 - 4 Green LED Output

H7 - 5 Yellow LED Output

H7 - 6 Red-Green-Yellow LED Common

H8 - 1 1 Isolation Valve/Pump Request Relay N/O

H8 - 2 Isolation Valve/Pump Request Relay N/C

H8 - 3 24 VAC Common

H9 - 1 1 Return Air Temperature Signal

H9 - 2 Return Air Temperature Common

TB1 - 1 1 Room Sensor LED Output

TB1 - 2 2 Fan Mode / Heat-Cool-Auto Input

TB1 - 3 3 Setpoint Adjust Input

TB1 - 4 4 Room Temperature Sensor / Tenant Override

TB1 - 5 5 DC Signal Common

Test-1 R 24 VAC

Test-2 W2 Heat Stage 2 Input

Test-3 W1 Heat Stage 1 Input

Test-4 Y2 Cool Stage 2 Input

Test-5 Y1 Cool Stage 1 Input

Test-6 G Fan

TB2 - 1 R 24 VAC

TB2 - 2 A Alarm Output

TB2 - 3 W2 Heat Stage 2 Input

TB2 - 4 W1 Heat Stage 1 Input

TB2 - 5 Y2 Cool Stage 2 Input

TB2 - 6 Y1 Cool Stage 1 Input

TB2 - 7 G Fan Input

TB2 - 8 O Tenant Override Input

TB2 - 9 C 24 VAC Common

TB3 - 1 E Mark IV Emergency Shutdown Input

TB3 - 2 U Mark IV Unoccupied/Occupied Input

L1 - 1 L1 - 1 Line Voltage Terminal 1

L1 - 2 L1 - 2 Line Voltage Terminal 2

L1 - 3 L1 - 3 Line Voltage Terminal 3

N1 N1 Neutral Terminal 1

N2 N2 Neutral Terminal 2

N3 N3 Neutral Terminal 3

Table 7: Conguration Jumper Settings

Jumper Description Options

JP1 Mode

Shorted for service/test operation mode JP2 Fan operation only applies to Open for continuous fan operation network controls Shorted for cycling fan operation

JP3 Freeze protection

Shorted for antifreeze protection JP4 Future spare Future spare JP5 Set point adjustment range only Open for adjustment range of -3.0° to +3.0° F applies to network controls with a Shorted for 50° to 90° F adjustment range room temperature sensor

JP6 Room control type

Shorted for room temperature sensor control, MicroTech III only JP7 Future spare Future spare

JP8 Future spare Future spare

Page 28 of 48 / IM 986-2

Open for normal operation mode

Open for water freeze protection

Open for thermostatic room control

Note: A random start delay time between 180 and 240 seconds is generated at power up.

Figure 44: MicroT ech III Unit Controller Terminal Locations

Location of Conguration Jumpers on the MicroTech III Unit Controller

IM 986-2 / Page 29 of 48

I/O Expansion Module

Table 8: I/O Expansion Module LED & Fault Outputs

Mode / Fault

Terminal “A”

Yellow Green Red

Status LED's

Thermostat Alarm

Light Output

For installation and operation information on MicroTech III unit controller and other ancillary components, see:

• IM 927 - MicroTech III Unit Controller for Water

Source Heat Pumps (LonWorks).

The I/O Expansion Module is a eld-installed or factory

installed option. It is an extension of the MicroTech III unit controller and provides extra functionality. The I/O Expansion Module has 2 main purposes:

• The I/O Expansion Module has outputs to control

electric heat on a standard Water Source Heat Pump.

• The I/O Expansion Module has an independent LED

annunciator to identify operational fault conditions on second stage equipment.

Figure 45: I/O Expansion Module Conguration Jumper

Terminals

Jumper Terminals

Features

Second Circuit

• High pressure switch

• Low pressure switch

• Low suction line temperature sensor

• Compressor output

• Reversing valve

Standard Heat Pumps / Single Circuit Units

• Monitors entering water temperature for

boilerless electric heat control

• Outputs for medium and high speed fan controls.

Invalid Conguration Jumper Setting

Base Board Communication Fail

High Pressure #2 Fault Off Off Flash De-energized

Low Pressure #2 Fault Off Off On De-energized

Low Suction Temp #2 Fault Flash Off Off De-energized

Sensor Failures Low Suction

Low Suction Temp #2, Flash Flash On De-energized

EWT (w/ Boilerless EH only)

Service Test Mode Enabled Flash Flash Flash De-energized

Unoccupied Mode On On Off Energized

Occupied, Bypass, Standby, or Tenant Override Modes

Normal Operation Off On Off De-energized

Flash Flash Off De-energized

Off Flash Flash N/A

Off On Off Energized

Note: Mode / Faults are listed in order of priority.

Boilerless electric heat only

Alarm/fault LED indications take precedence over service test mode LED

indication. The controller shall use service test mode if the service test mode jumper is installed, even if the LED’s indicate an alarm/fault.

Table 9: I/O Expansion Module Jumper Designations

Jumper Description Options

JP1 Number of

JP2

Water Reheat Shorted to enable reheat JP3 and JP4 open for no supplemental heat JP3 Supplemental JP3 open, JP4 shorted for & JP4 Heat Type boilerless electric heat JP3 and JP4 shorted is an invalid setting JP5 and JP6 open for single-speed fan

JP5

& JP6 Selection JP5 shorted and JP6 open for two-speed fan JP 5 and JP6 shorted is an invalid setting

JP7

Speed Type Shorted for two-speed compressor

JP8 Future Spare

Compressors Shorted for dual compressor

Hot Gas/

Fan Speed three-speed fan

JP5 open, JP6 shorted for

Compressor Open for single-speed compressor

Open for single compressor

Open to disable reheat

Adding an I/O Expansion Module (with an interconnect cable) to the main controller allows two-stage operation of the Water Source Heat Pump.

Page 30 of 48 / IM 986-2

MicroTech III Controller With LonWorks® Communication Module

For installation and operation information on

onWorks Communication Module and other ancillary

L control components, see:

• IM 927 - MicroTech III Unit Controller for Water

Source Heat Pumps (LonWorks).

• IM 933 - LonMaker Integration Plug-in Tool: For

use with the MicroTech III Unit Controller.

• IM 955 - MicroTech III Wall Sensor For use with

MicroTech III Unit Controller with LonWorks

Figure 46: LonWorks Communication Module

The LonWorks communication module will plug into the MicroTech III unit controller at the CN_LON1

Header (see gure 48, page 34).

Each McQuay water source heat pump can be equipped with a L controller is microprocessor-based and is designed to communicate over a L network. The unit controller is factory programmed and tested with all the logic required to monitor and control the unit. The wall thermostat sets the unit mode of operation. The unit controller monitors water and air temperatures, and can communicate fault conditions to a L

The MicroTech III unit controller include unit-mounted return air, discharge air and leaving water temperature sensors. Options include setpoint adjustment and tenant override and the capability of substituting the return air sensor with a wall-mounted temperature sensor. Each unit controller orchestrates the following unit operations:

 Enable heating and cooling to maintain setpoint

 Enable fan and compressor operation.  Monitor all equipment protection controls.

onWorks communication module. The

onWorks communications

onWork communications network.

based on a room sensor.

 Monitor leaving water temperature.  Relay status of all vital unit functions.  Support optional control outputs.

A set of three status LED's aid in diagnostics by indicating the water source heat pump operating mode and alarm conditions. If there are no current alarm conditions, the Green LED will indicate the normal unit operating mode as shown in the table below. If there are one or more alarm conditions present, various LED's

will ash to indicate an alarm condition.

MicroTech III heat pumps with a MicroTech III unit

controller are LonMark certied and designed to be

linked with a centralized building automation system through a L

onWorks communications network for

centralized scheduling and management of multiple heat pumps. Wall-mounted room sensors are available to control the heating and cooling operation of each MicroTech III Water Source Heat Pump Unit Controller. Available room sensors include: room sensor with LED status and tenant override button, room sensor with LED status, timed-override button, room sensor with LED status, timed-override button, and setpoint adjustment, and room sensor with LED status, timedoverride button, setpoint adjustment.

The MicroTech III water source heat pump unit controller provides control of McQuay water source heat pumps. The controller enables the mode of operation, monitors the water and air temperatures, and indicates fault conditions. Each unit controller is factory programmed, wired, and tested for effective operation of your McQuay water source heat pump.

The MicroTech III water source heat pump controller

onWorks technology. One of the following two

uses L versions of the application software is loaded into the controller at the factory.

LonMark® 3.4 certied application code is the current

standard application code for MicroTech III units. Use LonMark application code in new applications including:

 Units that operate stand alone.

 Monitor discharge air temperature.

IM 986-2 / Page 31 of 48

MicroTech III Controller With BACnet Communication Module for Native BACnet Communications

McQuay water source heat pumps are available with a factory mounted and tested McQuay BACnet communication module The module is factory programmed and tested with all the logic required to control the unit, and is designed to communicate over a BACnet MS/TP communications network to a building automation system (BAS). The module operates the compressor, fan, and reversing valve as required to maintain the space temperature within the current setpoints. Data regarding equipment status, water and air temperatures, and fault conditions can be monitored by any BAS. Setpoints and other system preferences may be changed remotely using a front end workstation or service tool software.

Each BACnet-compliant controller has the following

operating features:

Start-up – The unit will not operate until all the



inputs and safety controls are checked for normal conditions.

 Fan operation – Fan operation can be customized in

software to run continuously during occupied mode, or to cycle ON or OFF appropriately on a call for heating and cooling.

 Cooling mode – On a call for cooling, the compres-

sor and fan start immediately. Compressor runtime is calculated as a percent of full cycle time (17 minutes) using proportional-integral control to

maximize efciency.

The module makes operational data and commands available on a communications network using BACnet objects and properties. Each heat pump controller connects to the communication network using a BACnet MS/TP communication network, which is a simple twisted-pair communications connection that operates at up to 76.8 Kbps. DIP switches on the controller enable the MS/TP MAC address to be set in the range 0-127. A status LED on the unit indicates communication activity on the MS/TP communication network.

Figure 47: MicroTech III BACnet W ater Source Heat Pump Snap-in Communication Module

Each BACnet-compliant unit includes discharge air and leaving water temperature sensors, as well as all equipment protection sensors, signals, and switches. Wall-mounted room sensors are available to control heating and cooling operation. Sensors are available for status override; wall-mounted sensors with tenant setpoint adjustment lever and timed-override button; wall-mounted sensors with LED status, timed-override button, tenant setpoint adjustment buttons, password-

protected eld service access to operational data, and

optional humidity sensor; and wall-mounted sensors with LCD and programmable operation.

Heating mode – On a call for heating, the com-



pressor and fan start immediately, and compressor run-time is calculated as a percent of full cycle time (17 minutes) using proportional-integral control to

maximize efciency.

Short Cycle Protection and Random Start – A start



delay of 180 seconds plus the compressor’s MAC address in seconds prevents short-cycling and simultaneous start-up. A minimum 2-minute on time and 5-minute off time for the compressor further ensures short-cycle protection.

 Occupied Mode – A simple software control signal

from the building automation system or a wallmounted unit puts the unit into occupied mode. The unit controls compressor and fan operation to maintain occupied setpoints. High and low limits

for occupied setpoints are software congurable.

Unoccupied Mode – A simple software control



signal from the building automation system or a wall-mounted unit puts the unit into unoccupied mode for night setback operation. The unit controls compressor and fan operation to maintain unoccupied heating and cooling setpoints, which are also

software congurable.

Page 32 of 48 / IM 986-2

 After-hours Override Mode – A simple software

control signal from the building automation system or a wall-mounted unit can initiate after-hours heating or cooling in half-hour increments. Maximum

override time is software congurable up to 9.5

hours. This feature can also be disabled in software.

 Reversing valve delay – On a call for cooling,

the compressor and fan will start 0 to 30 seconds later. If the reversing valve output is energized, the reversing valve output will de-energize 5 seconds after the compressor energizes. When the load is

satised, the compressor and fan shut off. On a

call for heating, the compressor and fan start. If the reversing valve output is de-energized, the reversing valve output will be energized 5 seconds after

the compressor starts. When the load is satised, the

compressor and fan shut off. The reversing valve remains energized.

 Load Shed – Load shedding can be orchestrated by

the building automation system using the occupied/ unoccupied command in software.

 Brownout Protection – An on-board sensor mea-

sures input voltage and suspends compressor and fan operation if the supply voltage drops below 82% of the normal line voltage for a minimum of 10 seconds, creating an alarm available in software. The alarm automatically resets when the supply voltage returns to above 90% of normal.

 Condensate Overow Protection – A liquid sensor

at the top of the drain pan senses a high water level. Upon sensing water, cooling operation is suspended, while heating operation is allowed. The controller creates an alarm available in software. The alarm automatically resets when the water level returns to normal.

 Attained T emperature and Water Temperature

Alarms –Attained temperature, water temperature alarms with software-adjustable setpoints are available in software. The controller samples supply air and records attained temperatures for heating and cooling. If after two hours of operation, the attained temperature does not meet the software-congurable setpoint for heating or cooling as appropriate, a software alarm occurs. The alarm automatically resets when the attained temperature is within setpoints. The controller also monitors leaving water temperature. If the leaving water temperature is outside software-congurable setpoints, compressor operation is suspended and high or low water temperature alarms occur. The alarm automatically resets when the water temperature returns to within 6 deg. F of the setpoint.

 Unit Self-test Mode – While the unit is in occu-

pied mode, a self-test can be initiated via software. Upon initiation of the test, compressor operation is

suspended for a minimum of ve minutes, cooling

attained temperatures are cleared, and attained temperature alarms are cleared. The unit then switches to full heat for four minutes and then records the attained supply air temperature. Compressor opera-

tion is then suspended for ve minutes. The unit

then switches to full cooling for four minutes and the attained supply air temperature is recorded. Attained temperature alarms are set if the attained temperatures failed to reach alarm setpoints during heating or cooling.

 Safety Control – The unit monitors refrigerant pres-

sure and generates separate high-pressure and lowpressure alarms available in software. While either alarm is active, compressor operation is suspended. In a refrigerant low-temperature condition, an alarm occurs and the unit operates in cooling mode for 60 seconds to defrost the heat exchanger, after which compressor operation is suspended. These alarms can be reset in software or by cycling power to the controller.

IM 986-2 / Page 33 of 48

Figure 48: LonWorks Communication Module Placement on MicroTech III Unit Controller

Page 34 of 48 / IM 986-2

Typical Wiring Diagram

Figure 49: MicroTech III Unit Controller, 2-Speed Fan (Toggle or Thermostat), PSC Motor 208-230/60Hz/1-Phase, Unit Sizes 009-018

Drawing No. 669349301

Legend

Description

Item

C1 C2 CM COS Condensate Overow Sensor DSC FMP FMR Fan Motor Connect Receptacle FCP FCR FSR Fan Speed Relay FSS FS1 Fuse 1 FS2 Fuse 2 HP ISO LED1 LP MIII MicroTech III Main Board MPP MPR OVL Compressor Overload Protector PDPG Primary Drain Pan Ground RV SOS SLTS TS1 Fan Speed Terminal Strip TS2 Thermostat Terminal Strip TSP TSR Terminal Strip Connector Terminal X1

Capacitor-Compressor Capacitor-Fan Compressor - Motor

Disconnect Switch Fan Motor Connector Plug

Fan Connector Plug Fan Connector Receptacle

Fan Speed Switch - Optional

High Pressure Switch

Isolation Valve - Optional LED Annunciator / Harness

Low Pressure Switch

Main Power Connector Plug Main Power Connector Receptacle

Reversing Valve Solenoid Secondary Overow Sensor Suction Line Temp Sensor

Terminal Strip Connector Plug

Transformer

Table B

208V 230V ORG

RED

Note:

ransformer:

Unused wire to be capped.

IM 986-2 / Page 35 of 48

Typical Wiring Diagram

Figure 50: MicroTech III Unit Controller, 2-Speed Fan (Toggle or Thermostat), PSC Motor 265-277/60Hz/1-Phase, Unit Sizes 009-036

Drawing No. 669349401

Legend

Description

Item

C1 C2 CC CM DSC FMP FMR Fan Motor Connect Receptacle FCP FCR FPR Fan Power Relay FSR Fan Speed Relay FSS FS1 Fuse 1 FS2 Fuse 2 HP ISO LED1 LP MIII MicroTech III Main Board MPP MPR COS Condensate Overow Sensor PDPG Primary Drain Pan Ground RV SOS SLTS TS1 Fan Speed Terminal Strip TS2 Thermostat Terminal Strip TSP TSR Terminal Strip Connector Terminal X1

Capacitor-Compressor Capacitor-Fan Compressor Contactor Compressor - Motor Disconnect Switch Fan Motor Connector Plug

Fan Connector Plug Fan Connector Receptacle

Fan Speed Switch - Optional

High Pressure Switch

Isolation Valve - Optional LED Annunciator / Harness

Low Pressure Switch

Main Power Connector Plug Main Power Connector Receptacle

Reversing Valve Solenoid Secondary Overow Sensor Suction Line Temp Sensor

Terminal Strip Connector Plug

Transformer

Page 36 of 48 / IM 986-2

Typical Wiring Diagram

Figure 51: MicroTech III Unit Controller, 2-Speed Fan (Toggle or Thermostat), X13 Motor 208-230/60Hz/1-Phase, Unit Sizes 021-036

Drawing No. 669349701

Legend

Description

Item

C1 C2 CC CM COS Condensate Overow Sensor DSC FMP FMR Fan Motor Connect Receptacle FCP FCR FPR Fan Power Relay FSR Fan Speed Relay FSS FS1 Fuse 1 FS2 Fuse 2 HP ISO LED1 LP MIII MicroTech III Main Board MPP MPR PDPG Primary Drain Pan Ground RV SOS SLTS TB3 Terminal Block TS1 Fan Speed Terminal Strip TS2 Thermostat Terminal Strip TSP TSR Terminal Strip Connector Terminal X1

Capacitor-Compressor Capacitor-Fan Compressor Contactor Compressor - Motor

Disconnect Switch Fan Motor Connector Plug

Fan Connector Plug Fan Connector Receptacle

Fan Speed Switch - Optional

High Pressure Switch

Isolation Valve - Optional LED Annunciator / Harness

Low Pressure Switch

Main Power Connector Plug Main Power Connector Receptacle

Reversing Valve Solenoid Secondary Overow Sensor Suction Line Temp Sensor

Terminal Strip Connector Plug

Transformer

Table B

208V 230V ORG

RED

Note:

ransformer:

Unused wire to be capped.

IM 986-2 / Page 37 of 48

Typical Wiring Diagram

Figure 52: MicroTech III Unit Controller, 2-Speed Fan (Toggle or Thermostat), X13 Motor 265-277/60Hz/1-Phase, Unit Sizes 021-036

Drawing No. 669349801

Legend

Description

Item

Capacitor-Compressor Capacitor-Fan Compressor Contactor Compressor - Motor

Disconnect Switch Fan Motor Connector Plug

Fan Connector Plug Fan Connector Receptacle

Fan Speed Switch - Optional

High Pressure Switch

Isolation Valve - Optional LED Annunciator / Harness

Low Pressure Switch

Main Power Connector Plug Main Power Connector Receptacle

Reversing Valve Solenoid Secondary Overow Sensor

Suction Line Temp Sensor

Terminal Strip Connector Plug

Transformer

Page 38 of 48 / IM 986-2

Start-up

CAUTION

Cooling or Heating – Manual Operation

Adjust the thermostat heating or cooling setpoint to maintain desired space temperature.

The MicroTech III unit controller has built-in features such as random start, compressor time delay, night

setback, load shed, shutdown, condensate overow

protection, defrost cycle, brownout, and LED/fault outputs. Table 10 shows the LED and fault output sequences. The 24 volt low voltage terminal strip is set so R-G energizes the fan. R-W1 energizes the fan and compressor and reversing valve for heating operation. R-Y1 energizes the fan and compressor for cooling mode of operation.

T able 10: LED Fault Indicators

Normal Mode Off On Off Off High Pressure Fault Off Off Flash On Low Temperature Fault* Flash Off Off On Condensate Overflow On Dim Off On Brownout Off Flash Off On Load Shed Off Off On Off Unoccupied Mode On On Off Off Unit Shutdown Off Flash Off On

LEDs

Indication

Yellow Green Red

Fault

Output

IMPORTANT

Each water source heat pump unit has a compressor and

blower motor. Each component part has and internal

temperature and amperage sensitive overload. If the overload opens it will suspend unit operation. Check component parts by measuring the winding resistance and looking for an open circuit.

Additional Accessories – General Thermostats and Wall Sensors

Easy-to-operate comfort command centers provide a complete range of deluxe features.

The reversing valve is set up to be energized in the heating mode. The circuit board has a fan interlock circuit to energize the fan whenever the compressor is on.

The MicroTech III unit controller has a lockout circuit to stop compressor operation if any one of its safeties opens (high pressure or suction line sensor). If the suction line low temperature sensor opens, the unit will go into the cooling mode for 60 seconds to defrost any slush in the water-to-refrigerant heat exchanger.

After 60 seconds, the compressor is locked out. If

the condensate sensor detects a lled drain pan, the

compressor operation will be suspended only in the cooling mode. The unit is reset by opening and closing the disconnect switch on the main power supply to the unit in the event the unit compressor operation has been suspended due to low suction line sensor reaching its set point, or a high pressure switch.

The MicroTech III unit controller has a fault output signal to an LED on a wall thermostat. Table 10 shows in which function the fault output is “on” (sending a signal to the LED).

Wall-Mounted Programmable Electronic Thermostat (P/N 668810301) 1 Heat/1 Cool, Auto Changeover, Hardwired

• 7-Day, 5-2-Day 5-1-1 Day Programmable

• Congurable

• Single-Stage Heat/Cool Systems

• Single-Stage Heat Pump Systems

• Large Display With Backlight

• Selectable Fahrenheit or Celsius

• Compatible with Gas, Oil, or Electric

• SimpleSet™ Field Programming

• Status Indicator Light

• Relay Outputs (minimum voltage drop in thermostat)

• Remote Sensor Compatible

• Ideally Suited for:

– Residential (New Construction/Replacement) – Light Commercial

IM 986-2 / Page 39 of 48

Specifications–668810301

Electrical rating: • 24 VAC (18-30 VAC)

• 1 amp maximum per terminal

• 3 amp maximum total load

Temperature control range: 45°F to 90°F (7°C to 32°C) Accuracy: ± 1°F (± 0.5°C)

System congurations: 1-stage heat, 1-stage cool, heat pump, gas, oil, electric

• Relay Outputs (minimum voltage drop in thermostat)

• Remote Sensor Compatible

• Ideally Suited for:

– Residential (New Construction/Replacement) – Light Commercial

Specifications–668811201

Electrical rating: • 24 VAC (18-30 VAC)

• 1 amp maximum per terminal

• 3 amp maximum total load

Timing:

Anti-short Cycle: 4 minutes

Backlight Operation Terminations: S1, S2, Y, W/O/B, G2, G1, RC, RH, C For detailed installation, operation and application refer

to Operation & Application Guide LIA303

Figure 53: Thermostat Parts Diagram - Part No. 668810301

Up button

Down button

Right (fan) button

Left (system) button

Field programming pins

Conguration switch

Reset switch

RC/RH Jumper

Non-Programmable Electronic Thermostat (P/N 668811201)

1 Heat/1 Cool, Auto Changeover, Fan Speed Control, Hardwired

Temperature control range: 45°F to 90°F (7°C to 32°C) Accuracy: ± 1°F (± 0.5°C)

System congurations: 1-stage heat, 1-stage cool, heat pump, gas, oil, electric

Timing:

Anti-short Cycle: 4 minutes

Backlight Operation Terminations: S1, S2, Y, W/O/B, G2, G1, RC, RH, C For detailed installation, operation and application refer

to Operation & Application Guide LIAF014

Figure 54: Thermostat Parts Diagram - Part No. 668811201

Up button

Down button

Right (fan) button

Left (system) button

Reset switch

Conguration switch

Reset switch

Fan switch

Field programming pins

RC/RH Jumper

• Congurable

• Single-Stage Heat/Cool Systems

• Single-Stage Heat Pump Systems

• Fan Speed Control

• Large Display With Backlight

• Selectable Fahrenheit or Celsius

• Compatible with Gas, Oil, or Electric

• SimpleSet™ Field Programming

• Status Indicator Light

Page 40 of 48 / IM 986-2

Wireless Temperature Control (T9000)

The T9000 Wireless Temperature Control is designed to provide precision temperature control without the installation labor and expense of wiring.

• Powered by AA batteries

• Mounts in any suitable location that will provide

good temperature control.

• Large LCD display provides the user with

current room temperature, set point temperature, time, program interval, and other system status information.

For detailed installation, operation refer to Operation &

Maintenance Bulletin OM 984. The second part of the T9000 system is called a Remote Control Node or “RCN”. An RCN interfaces with

specic desired HVAC equipment, and communicates

with its thermostat using unlicensed 900 MHz, radio frequency energy. At the time of installation, the T9000 thermostat is linked to one or more RCN controls. The thermostat and RCN that have been linked will not interfere with, or be affected by, any other thermostat or RCN in adjacent rooms, apartments, or neighboring homes.

Remote Control Node (RCN)

Used with the Wireless Temperature Control, the

RCN interfaces with specic HVAC equipment, and

communicates with its thermostat using unlicensed 900 MHz, radio frequency energy. Contact your local McQuay Representative for details.

Programmable Non-programmable

Figure 55: T9000 Overview

IM 986-2 / Page 41 of 48

MicroT ech III Wall-Mounted Room T emperature Sensors

(Kit P/N 669529101, 669529201, 669529001)

Figure 56: MicroT ech III Wall-Mounted Room Temperature Sensors (669088201 Not Shown)

Sensor 669529101 Sensor 669529201 Not Shown

Sensor 669529001

General

CAUTION

When the optional wall-mounted room temperature sensor is connected to the unit controller, the Return Air Temperature (RAT) sensor must not be installed. The wallmounted room temperature sensor and return air sensor must not be connected simultaneously or the unit will not operate properly.

Specifications

Thermistor resistance (10kΩ)

(Conforms to advance thermal products curve 2) Ambient T emperature Limits: Shipping and Storage: 40°F to 160°F (–40°C to 71°C) Operating: 40°F to 140°F (4°C to 60°C) Humidity: 5 to 95% RH, non-condensing Locations: NEMA Type 1, Indoor only Connections: Color Coded Leads

Wiring Sensors to the MicroTech III Unit Controller

Figure 58: T emperature Sensor W iring to MicroT ech III Unit Controller (669529101, 669529201)

Temperature Sensor Terminals

MicroT ech III Wall-Mounted Room Temperature Sensors provide electronic sensing of room temperatures at wall locations. All sensor models feature

a thermistor (10kΩ) and a green LED for unit status.

Tenant ove r r i d e , s e t p o i n t adjustment potentiometer, thermometer, and a communications port are optional features available in any combination

This manual provides general information for the MicroT ech III Wall-Mounted Room Temperature Sensors. For installation instructions refer to IM 955

Figure 57: MicroTech III Wall Sensor Details

0 to 10 K ohm

Potentiometer

4.59"

Status LED (Green)

Fan Control Slide Switch

MicroTech III Unit Controller TB1 Terminals

Figure 59: T emperature Sensor W iring to MicroT ech III Unit Controller (669529001)

Temperature Sensor Terminals

Mode Control Slide Switch

Page 42 of 48 / IM 986-2

Tenant Override Momentary Push Button Switch

MicroTech III Unit Controller TB1 Terminals

Optional Remote Sensor (P/N 66720401)

The fast, easy solution for temperature sensing problems.

• For tamper prone areas

• Poor airow areas

Motorized Isolation Valve & Relay

The motorized valve kit may be ordered as a eld-

installed accessory. Wired as shown in Figure 60, the motorized valve will

open on a call for compressor operation. Valves for unit sizes 009 to 018 are 1/2".

• Troubled applications

• Foam gasket prevents drafts through wall opening

• Mounts to standard 2" x 4" outlet box

• 2¾"W x 4½"H

1. Remove cover from remote sensor housing.

2. Select an appropriate location for mounting the

remote sensor.

3. Mount remote sensor unit using hardware provided.

4. Install two strand shielded wire between remote

sensor and thermostat. Shielded wire must be used.

Do not run remote sensor wire in conduit with other wires.

• Wire 1 should run between the S1 terminal on the

thermostat and the S1 terminal on the remote sensor

• Wire 2 should run between the S2 terminal on the

thermostat and the S2 terminal on the remote sensor

• Connect the shielding of the wire to the S2 terminal

on the thermostat

5. Disable the main sensor (R12) on the thermostat by

cutting it from the circuit board.

Using a Normally Closed (N/C), power open valve,

wire as illustrated in gure 61.

Figure 60: Normally Closed, Power Open Motorized Valve & Relay Wiring

Actuator & Valve Assembly

Figure 61: Normally Closed, Power Open Motorized Valve & Relay Wiring Detail

Anti-short Bushing

Connector

Conduit

Anti-short Bushing

Connector

Pin(s), female connect to terminal H8

Note: Connectors on valve must be cut off and stripped back and the wires twisted to make connections to the IV/PR Terminals

Pump Restart Relay Kit P/N 061419001

The MicroTech III unit controller has an internal Pump Restart Relay connected to H8, Pin 2 for the Normally Open (N/O) terminal of the internal relay.

Connect to H8, Pin 1 for the Normally Closed (N/C) terminal of the internal relay.

The output of the internal pump restart relay is 24volts AC and the output is not available when the H8 connection is used to control a motorized valve.

IM 986-2 / Page 43 of 48

Troubleshooting

The in and outs of R-410A

R-410A is a non-ozone depleting blend of two

refrigerants - HFC-125 and HFC-32 in a fty percent

mixture. R-410A exhibits higher operating pressure and refrigeration capacity than R-22. R-410A is intended for use in new air conditioning applications that have traditionally been used HCFC-22 (R-22). Due to higher capacity and pressure of R-410A, it must not be used in existing R-22 systems.

Although R-410A is non-ammable at ambient

temperature and atmospheric pressure, it can become combustible under pressure when mixed with air.

Note: Because a water source heat pump operates under a wide range of water and air temperatures, the values printed below are to be taken as suggested pressure and temperatures. All McQuay water source heat pumps are designed for commercial use. The units are designed for the cooling mode of operation and fail safe to cooling. The reversing valve is energized for the heating mode of operation.

Superheat Head Pressure Water Delta T

8 to 14 degrees 335-355 PSIG 10° to 14°

All information above is based on ISO standard 13256-1 and tested at these conditions.

Note: R-410A should not be mixed with air under pressure for leak testing. Pressure mixtures of dry nitrogen and R-410A can be used for leak testing.

Lubrication

R-410A should be used only with polyester (POE) oil. The HFC refrigerant components in R-410A will not be compatible with mineral oil or alkylbenzene lubricants. R-410A systems will be charged with the OEM recommended lubricant, ready for use with R410A.

Charging

Due to the zeotropic nature of R- 410A, it should be charged as a liquid. In situations where vapor is normally charged into a system, a valve should be

installed in the charging line to ash the liquid to vapor

while charging.

Make certain that the recycle or recovery equipment used is designed for R-410A. The pressure of R-410A refrigerant is approximately 60 percent greater than that of R-22. Pressure gauges require a range up to 800 PSIG high side and 250 PSIG low side. Recovery cylinders require a 400 PSIG rating – do not put R410A in a 300 PSIG rated cylinder.

WARNING

Recycle/recovery equipment must be designated for R410A. R-410A pressure is greater than R-22. Improper equipment can cause severe injury or death.

General Maintenance

1. Normal maintenance on all units is generally

limited to lter changes. Units are provided with

permanently lubricated motors and require no oiling even though oil caps may be provided.

2. Filter changes are required at regular intervals. The time period between changes will depend upon the project requirements. Some applications such as motels produce a lot of lint from carpeting and

linen changes, and will require more frequent lter changes. Check lters at 60-day intervals for the rst

year until experience is acquired. If light cannot be

seen through the lter when held up to sunlight or

a bright light, it should be changed. A more critical standard may be desirable.

3. The condensate drain pan should be checked

annually and cleaned and ushed as required.

4. Record performance measurements of volts, amps, and water temperature differences (both heating and cooling). A comparison of logged data with start-up and other annual data is useful as an indicator of general equipment condition.

5. Periodic lockouts almost always are caused by air or water problems. The lockout (shutdown) of the unit is a normal protective result. Check for dirt in the

water system, water ow rates, water temperatures, airow rates (may be a dirty lter), and air

temperatures. If the lockout occurs in the morning following a return from night setback, entering air below machine limits may be the cause.

Page 44 of 48 / IM 986-2

Troubleshooting Refrigeration Circuit

Charge

Symptom

Head Suction Compressor Super

Pressure Pressure Amp Draw

Subcooling

Temp (loops) Temp Lock

Heat

Air Water Safety

Differential Differential Out

Undercharge System Low Low Low High Low Low Low Low Pressure (Possible Leak)

Overcharge System High High High Normal High Normal High Pressure

Low Air Flow Heating

Low Air Flow Cooling

Low Water Flow Heating Low Water Flow Cooling High High High High Low Low High High Pressure

High Air Flow Heating High Air Flow Cooling High Water Flow Heating

High Water Flow Cooling TXV Restricted High Low High High Low Low

High High High Low Low Low

Low

Normal

Low

Normal

Low Low High Low High Low Temp

Low Low Low Low High Low Low Low Temp Low High Normal High Low Low Normal High Pressure

Normal Low Normal High Normal Normal Low High Pressure

Low Low Low Low High Normal Low Low Temp

Normal Low

High

Normal

Low

Normal

Low High Low High Pressure High High Low Low Temp

Normal

Low

Figure 62: Cooling Mode

Return Air

Coil –

Air to

Refrigerant

Heat

Exchanger

Blower

Conditioned Air

(Cooling)

Cooling Refrigeration Cycle

When the wall thermostat is calling for COOLING, the reversing valve directs the flow of the refrigerant, a hot gas, leaving the compressor, to the water-to-refrigerant heat exchanger. Here the heat is removed by the water and the hot gas condenses to become a liquid. The liquid then flows through a thermal expansion metering system to the air-torefrigerant heat exchanger coil. The liquid then evaporates becoming a gas, at the same time absorbing heat and cooling the air passing over the surfaces of the coil. The refrigerant then flows as a low pressure gas through the reversing valve and back to the suction side of the compressor to complete the cycle.

Thermal

Expansion Valve

Coaxial Heat

Exchanger

Water In

Water Out

Reversing Valve

Sensing Bulb and Capillary Tube

Compressor

Figure 63: Heating Mode

Return Air

Thermal

Coil –

Air to

Refrigerant

Heat

Exchanger

Blower

Conditioned Air

(Heating)

Expansion Valve

Heating Refrigeration Cycle

When the wall thermostat is calling for HEATING, the reversing valve directs the flow of the refrigerant, a hot gas, leaving the compressor, to the air-to-refrigerant heat exchanger coil. Here the heat is removed by the air passing over the surfaces of the coil and the hot gas condenses to become a liquid. The liquid then flows through a capillary thermal expansion metering system to the water-to-refrigerant heat exchanger. The liquid then evaporates becoming a gas, at the same time absorbing heat and cooling the water. The refrigerant then flows as a low pressure gas through the reversing valve and back to the suction side of the compressor to complete the cycle.

Coaxial Heat

Exchanger

Water In

Water Out

Reversing Valve

Sensing Bulb and Capillary Tube

Compressor

IM 986-2 / Page 45 of 48

Troubleshooting the Water Source Heat Pump Unit

Figure 64: Troubleshooting Guide - Unit Operation

Low voltage, check power supply voltage

Check wiring - loose or broken and check for faulty connection

Check relays and contacts, also capacitor and wiring

Check high pressure switch, low pressure switch and low temperature switch to see if unit is cycling on the safety

Check to see if the reversing valve is not hung up and is operating correctly

Check condensate overflow switch in cool mode of operation

Check thermostat for proper location

Fuse may be blown, circuit breaker is open

Neither fan, nor compressor runs and all LED lights are off

Compressor runs in short cycle

Wire may be loose or broken. Replace or tighten wires

Fan operates,

Unit

compressor does not

Unit control, check thermostat for correct wiring or faulty thermostat

Check capacitor

Check wiring - loose or broken and check for bad connection

High or Low pressure lockout A. Cool mode, check water flow B. Heating mode, check air flow C. Check reversing valve for

proper valve position

Check compressor overload - make sure it is closed

Check compressor to ground, or for internal short to ground

Compressor winding may be open. Check continuity with ohm meter

Compressor attempts to start but does not

Check compressor wiring for defective wiring or loose connection

Check for defective compressor internal windings with ohm meter

Check for faulty compressor capacitor

Check for lock rotor amp draw

Insufficient cooling or heating

Check thermostat for improper location

Check for proper air flow filter could be dirty

Check blower assembly for dirt or faulty fan motor capacity

Check for low refrigerant charge

Check amp draw on blower assembly

Check for proper water flow and delta T (°F)

Page 46 of 48 / IM 986-2

DANGER

To avoid electrical shock, personal injury or death, be sure that field wiring complies with local and national fire, safety, and electrical codes, and voltage to the system is within the limits shown in the job-specific drawings and unit electrical data plate(s).

Power supply to unit must be disconnected when

making field connections. To avoid electrical shock, personal injury or death, be sure to rigorously adhere to field wiring procedures regarding proper lockout and tagout of components.

General Use and Information

The MicroTech III unit controller is provided with two drive terminals, R(24VAC) and C(0 VAC) that can be used by the end user to drive the thermostat inputs (G, Y1, Y2, W1, and W2) and control inputs (U, E, and O). Any combination of a single board drive terminal (R or C) may be used to operate the MicroTech III unit controller’s control or thermostat inputs. However, only one drive terminal (R or C) can be connected to any individual input terminal or damage may result. Some control inputs are not accessible to the end user (for example, HP, LP, SLTS, and COF).

Typically the MicroTech III unit controller’s R (24VAC) terminal is used to drive the board’s thermostat inputs and control inputs by connecting it to the R terminal of an industry standard thermostat. The control outputs of the standard thermostat are then connected to the MicroTech III unit controller thermostat inputs and control inputs as needed. Any remaining board input(s) may be operated by additional thermostat outputs or remote relays (dry contacts only).

All MicroTech III unit controller inputs must be operated by dry contacts powered by the control board’s power terminals. No solid state devices (Triacs) may be used to operate the MicroTech III unit controller inputs. No outside power source may be used to operate the MicroTech III unit controller inputs.

IM 986-2 / Page 47 of 48

Daikin McQuay Training and Development

Now that you have made an investment in modern, efficient Daikin McQuay equipment, its care should be a high priority. For training information on all Daikin McQuay HVAC products, please visit us at www. daikinmcquay.com and click on Training, or call 540-248-9646 and ask for the Training Department.

Warranty

All Daikin McQuay equipment is sold pursuant to its standard terms and conditions of sale, including Limited Product Warranty. Consult your local Daikin McQuay Representative for warranty details. Refer to Form 933-430285Y. To find your local Daikin McQuay Representative, go to www.daikinmcquay.com.

Aftermarket Services

To find your local parts office, visit www.daikinmcquay.com or call 800-37PARTS (800-377-2787). To find your local service office, visit www.daikinmcquay.com or call 800-432-1342. This document contains the most current product information as of this printing. For the most up-to-date product information, please go to www.daikinmcquay.com.

Products manufactured in an ISO certified facility.

McQuay VHC009 Installation Manual

Specifications and Main Features

Frequently Asked Questions

User Manual