Daikin IM 986-2 VHC Installation & Maintenance Manual Download

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Page 36 of 48 / IM 986-2

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

Item Description

Capacitor-Compressor

Capacitor-Fan

Compressor Contactor

Compressor - Motor

DSC

Disconnect Switch

FMP

Fan Motor Connector Plug

FMR

Fan Motor Connect Receptacle

FCP

Fan Connector Plug

FCR

Fan Connector Receptacle

FPR

Fan Power Relay

FSR

Fan Speed Relay

FSS

Fan Speed Switch - Optional

FS1

Fuse 1

FS2

Fuse 2

High Pressure Switch

ISO

Isolation Valve - Optional

LED1

LED Annunciator / Harness

Low Pressure Switch

MIII

MicroTech III Main Board

MPP

Main Power Connector Plug

MPR

Main Power Connector Receptacle

COS

Condensate Overflow Sensor

PDPG

Primary Drain Pan Ground

Reversing Valve Solenoid

SOS

Secondary Overflow Sensor

SLTS

Suction Line Temp Sensor

TS1

Fan Speed Terminal Strip

TS2

Thermostat Terminal Strip

TSP

Terminal Strip Connector Plug

TSR

Terminal Strip Connector Terminal

Transformer

Summary of Contents for IM 986-2 VHC

Page 1: ...k Water Source Heat Pumps Model VHC Vertical Stack Chassis Model VHF Vertical Stack Cabinet Unit Sizes 009 036 R 410A Refrigerant Group WSHP Part Number 669646403 Date May 2012 IM 986 2 2012 McQuay In...

Page 2: ...Page 2 of 48 IM 986 2...

Page 3: ...stalling 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...

Page 4: ...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 Suppl...

Page 5: ...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...

Page 6: ...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...

Page 7: ...r 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 e...

Page 8: ...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...

Page 9: ...8 11 37 50 88 58 09 2 38 3 125 2 2 6 72 12 4 7 9 3 3 18 18 92 18 07 18 11 37 50 88 58 09 2 38 3 125 2 2 6 72 12 4 7 9 3 3 Cabinet 96 18 07 18 11 37 50 88 58 09 2 38 3 125 2 2 6 72 12 4 7 9 3 3 A R S T...

Page 10: ...50 92 3 09 3 10 3 12 4 50 4 50 96 3 09 3 10 3 12 4 50 4 50 Dimensions Unit Size A B C D E F G J K L M N P Q 80 24 24 04 37 50 88 58 08 2 38 4 54 2 3 6 72 12 13 7 63 3 13 021 036 88 24 24 04 37 50 88 5...

Page 11: ...nt 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...

Page 12: ...Side Discharge Figure 14 Side Top 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...

Page 13: ...peed 1 021 Speed 2 Speed 1 024 Speed 2 Speed 1 030 Speed 2 Speed 1 036 Speed 2 710 640 710 640 1060 930 1060 930 ECM X13 Motor CFM Sizes 021 036 External Static Pressure Ducted Applications 830 770 83...

Page 14: ...oning the cabinet and connecting to the riser stub outs Figure 20 Vertical Riser Stub Outs Locations to Unit Knockouts 1 Dimension includes approximately 1 4 for vibration isolation pad 2 Dimension E...

Page 15: ...lation and fit 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 filter bracket See page 24 In...

Page 16: ...s illustrated in figure 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 floor as lo...

Page 17: ...each unit location This will prevent the introduction of dirt into the unit Figure 26 CAUTION Note Be sure that each riser stub out supply return are centered within the riser knockout in the cabinet...

Page 18: ...or 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 an...

Page 19: ...Locate the electrical power supply wiring from the building and feed wiring through the 1 2 conduit fitting strain relief on the unit as shown in Figure 27 28 following local electrical codes and reg...

Page 20: ...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...

Page 21: ...sharp metal edges To avoid personal injury heavy protective gloves should be used while moving and lifting the unit chassis Note To complete the flexible hose connections to the chassis only partiall...

Page 22: ...sis FPT supply and return pipe connections Using two crescent wrenches one to hold the chassis pipe connection and the second on the adapter fitting tighten the connections 2 Install the chassis by sl...

Page 23: ...o 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 i...

Page 24: ...the finished 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 the...

Page 25: ...Diffuser Foam seal applied to the cabinet face around perimeter of discharge air opening Diffuser flange compresses into the foam seal Double deflection Diffuser Foam seal field furnished installed 3...

Page 26: ...located in the base of the secondary unit Block offs must be installed on the secondary unit before putting it into position Twin Units Installation Twin opposite hand units share a common riser syst...

Page 27: ...ial EEPROM On On On De energized Corrupted Network Offline Off Off Off De enegized Received Table 6 MicroTech III unit controller LED fault outputs 1 Compressor relay compressor terminal is labeled CO...

Page 28: ...r 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 T...

Page 29: ...f 48 Figure 44 MicroTech III Unit Controller Terminal Locations Location of Configuration Jumpers on the MicroTech III Unit Controller Note A random start delay time between 180 and 240 seconds is gen...

Page 30: ...s Shorted for dual compressor JP2 Hot Gas Open to disable reheat Water Reheat Shorted to enable reheat JP3 and JP4 open for no supplemental heat JP3 Supplemental JP3 open JP4 shorted for JP4 Heat Type...

Page 31: ...rature 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 condit...

Page 32: ...nd timed override button wall mounted sensors with LED status timed override button tenant setpoint adjustment buttons password protected field service access to operational data and optional humidity...

Page 33: ...re and generates separate high pressure and low pressure alarms available in software While either alarm is active compressor operation is suspended In a refrigerant low temperature condition an alarm...

Page 34: ...Page 34 of 48 IM 986 2 Figure 48 LonWorks Communication Module Placement on MicroTech III Unit Controller...

Page 35: ...CR Fan Connector Receptacle FSR Fan Speed Relay FSS Fan Speed Switch Optional FS1 Fuse 1 FS2 Fuse 2 HP High Pressure Switch ISO Isolation Valve Optional LED1 LED Annunciator Harness LP Low Pressure Sw...

Page 36: ...an Connector Receptacle FPR Fan Power Relay FSR Fan Speed Relay FSS Fan Speed Switch Optional FS1 Fuse 1 FS2 Fuse 2 HP High Pressure Switch ISO Isolation Valve Optional LED1 LED Annunciator Harness LP...

Page 37: ...or Plug FCR Fan Connector Receptacle FPR Fan Power Relay FSR Fan Speed Relay FSS Fan Speed Switch Optional FS1 Fuse 1 FS2 Fuse 2 HP High Pressure Switch ISO Isolation Valve Optional LED1 LED Annunciat...

Page 38: ...Connector Plug FCR Fan Connector Receptacle FPR Fan Power Relay FSR Fan Speed Relay FSS Fan Speed Switch Optional FS1 Fuse 1 FS2 Fuse 2 HP High Pressure Switch ISO Isolation Valve Optional LED1 LED A...

Page 39: ...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 Units must be checked for wat...

Page 40: ...e 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...

Page 41: ...he Wireless Temperature Control the RCN interfaces with specific HVAC equipment and communicates with its thermostat using unlicensed 900 MHz radio frequency energy Contact your local McQuay Represent...

Page 42: ...r models feature a thermistor 10k and a green LED for unit status Tenant override setpoint adjustment potentiometer thermometer and a communications port are optional features available in any combina...

Page 43: ...cuit board Motorized Isolation Valve Relay The motorized valve kit may be ordered as a field installed accessory Wired as shown in Figure 60 the motorized valve will open on a call for compressor oper...

Page 44: ...eratures 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 h...

Page 45: ...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 surfac es of the coil and the hot gas conde...

Page 46: ...or lock rotor amp draw Check for defective compressor internal windings with ohm meter Check for proper air flow filter could be dirty Check for low refrigerant charge Check amp draw on blower assembl...

Page 47: ...d 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 remo...

Page 48: ...ld 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...

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