McQuay FDD Series Installation & Maintenance Data Download Page 19

IM 407 / Page 19 of 24

WSHP Mark IV/AC Board Low Voltage Terminal Strip

O W2 G W1 Y1 F

E

L

U

A

P

V

R

C

1

2

3

Auxiliary Relay

Orange

Yellow

White

WSHP Mark IV/AC Board Low Voltage Terminal Strip

O W2 G W1 Y1 F

E

L

U

A

P

V

R

C

1

2

3

Auxiliary Relay

Orange

Yellow

White

Options on Mark IV/AC Units

Motorized Valve & Relay for Unit Sizes 007 to 060

The auxiliary relay is designed to interface external equip-
ment with the Mark IV/AC board. The auxiliary relay has been
provided with the components necessary to protect from
electrical damage that may occur to the Mark IV/AC board
when using standard off-the-self relays. The auxiliary relay
can be used to provide fault signals, unit operation signals,
or to provide a means for remote equipment to control the
Mark IV/AC board. The orange, yellow, and white connec-
tions are short flying leads pre-attached to the board. The
diagrams shown are some connection examples.

Auxilliary Relay (P/N 106059701)

Wired as shown below the motorized valve will open on
a call for compressor operation. Valves for unit sizes
007 to 019 are 

1

2

" power-open spring-return, while unit

sizes 024 to 060 are 

3

4

" power-open spring-return.

Other thermostat combinations may be used. Valve and
auxiliary relay are purchased separately.

Note: The wiring shown below can only be used when the “P” terminal
is not being used as a pump restart signal to other equipment. If the
“P” terminal must be used as a pump restart signal to other equipment,
then wire the auxiliary relay’s yellow wire to “Y1”, white wire to “W1”,
and orange wire to “C”, then the valve will open on a call for occupied

heating or cooling from the thermostat.

6

3

1

Black to 6

White to 1

Plug

Pins,

Female

Conduit

Anti-Short
Bushing

Connector

Valve

36" (915 mm)

Lead Length

Operation: In this example the
auxiliary relay contacts can be
used to indicate a fault
condition. With the auxiliary
relay connected as shown, the
normally open contacts will
close during a fault condition.

Operation: In this example the
auxiliary relay contacts can be
used to signal WSHP fan
operation to another device. In
this example when the
thermostat energizes the “G”
terminal the auxiliary relay
normally open contacts will
close.

Operation: In this example the
auxiliary relay is used to
interface other control devices
to the Mark IV/AC board. Using
the Orange (-) and White (+)
wires, and 24vac or 24vdc,
another device could be used
to start and stop the WSHP
heating sequence.

P/N 060977401 - 1/2" Valve Kit
P/N 060977301 - 3/4" Valve Kit
P/N 859004354 - Valve Relay Kit

WSHP Mark IV/AC Board Low Voltage Terminal Strip

O W2 G W1 Y1 F

E

L

U

A

P

V

R

C

1

2

3

Auxiliary Relay

Orange

Yellow

White

WSHP Mark IV/AC Board Low Voltage Terminal Strip

O W2 G W1 Y1 F

E

L

U

A

P

V

R

C

1

2

3

Auxiliary Relay

Orange

Yellow

White

6

3

1

Time Clock
(by others)

Daisy-chain to
additional Mark IV/AC
board “U” terminals

BL

GN

Summary of Contents for FDD Series

Page 1: ...iagrams 8 14 Unit operation 15 LED Status and Fault Output Status 16 Thermostat Connections Mark IV AC units 17 Options for Mark IV AC units 19 22 Troubleshooting 23 Maintenance 24 2006 McQuay Interna...

Page 2: ...e of rough handling the cartons should be opened at once to check for concealed damage If any damage is found notify the carrier within 48 hours to establish your claim and request their inspection an...

Page 3: ...ance Opt Controls Main Access Panel Condensate Water Supply Water Return Heat Pump With Right Hand Return Air Arrangement Return Air Opt Controls Elec Entrance Main Access Panel Condensate Water Suppl...

Page 4: ...duct material the return air duct should be internally lined with acoustic insulation for sound attenuation Glass fiber duct board material is more absorb ing and may permit omission of the flexible c...

Page 5: ...system may also be made to work ac ceptably but proper water flow balancing is more diffi cult to achieve and maintain 2 The piping can be steel copper or PVC 3 Supply and return runouts are usually...

Page 6: ...for initial flush and blow down making sure city water fill 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 po...

Page 7: ...chine should not Operating Limits Environment This equipment is designed for indoor installation only Sheltered locations such as attics garages etc generally will not provide sufficient protection ag...

Page 8: ...upplied relays attached to the 24 volt terminals R W Y or G may introduce electrical noise Never install relays in series with the inputs Notes 1 Mark IV AC controller board contains a static sensitiv...

Page 9: ...relays in series with the inputs Figure 10 Unit sizes 019 through 048 208 230 265 volts single phase 060686606 Rev C Notes 1 Mark IV AC controller board contains a static sensitive micropro cessor Pr...

Page 10: ...switches are normally closed 5 Field supplied relays attached to the 24 volt terminals R W Y or G may introduce electrical noise Never install relays in series with the inputs Figure 12 Unit sizes 02...

Page 11: ...d relays attached to the 24 volt terminals R W Y or G may introduce electrical noise Never install relays in series with the inputs Notes 1 Mark IV AC controller board contains a static sensitive micr...

Page 12: ...24 volt terminals R W Y or G may introduce electrical noise Never install relays in series with the inputs Notes 1 Mark IV AC controller board contains a static sensitive micropro cessor Proper ground...

Page 13: ...o the 24 volt terminals R W Y or G may introduce electrical noise Never install relays in series with the inputs Notes 1 Mark IV AC controller board contains a static sensitive micropro cessor Proper...

Page 14: ...for 208V operation If 230V power supply is used transformer must be wired by disconnecting the power lead from the red transformer primary wire Place an insulation cap on the red transformer primary w...

Page 15: ...itch or low pressure switch on unit sizes 048 and 060 The unit does not have to be reset on a condensate overflow detection The Mark IV AC control board has a fault output signal to an LED on a wall t...

Page 16: ...rces may be used to operate Mark IV AC board inputs Note The fault output is energized when no faults exist The fault output is de energized during faults and when unit power is off Using Drive Using...

Page 17: ...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 o...

Page 18: ...rk IV AC Board Low Voltage Terminal Strip WSHP Mark IV AC Board Low Voltage Terminal Strip Multiple Unit Control Panel TB3 TB2 TB1 TB4 R C W1 Y1 W2 Y2 G Thermostat Terminals This version of the board...

Page 19: ...nal is not being used as a pump restart signal to other equipment If the P terminalmustbeusedasapumprestartsignaltootherequipment then wire the auxiliary relay s yellow wire to Y1 white wire to W1 and...

Page 20: ...r tempera ture sensor on the water supply line and then connect the duct heater control contacts to the duct heater control circuit 9 66 245 mm 007 042 14 50 368 mm 048 060 6 5 165 mm 007 042 4 12 105...

Page 21: ...C P terminal will change state causing a contact closure between terminal 58 and 64 signaling the loop water control LWC panel to restart the loop pump if Off The pump restart relay kit is typically m...

Page 22: ...signals is required on a single WSHP the MicroTech 2000 Auxiliary Module Kit 107239001 must be used and these additional output control signals will be connected to the Auxiliary board 1 circuit unit...

Page 23: ...eating Check compressor wiring for defective wiring or loose connection Check thermostat for improper location Check for defective compressor internal windings with ohm meter Check for bad compressor...

Page 24: ...differences both heating and cooling is recommended A comparison of logged data with start up and other annual data is useful as an indica tor of general equipment condition 5 Periodic lockouts alway...

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