PSG HS-4024U User manual

Application:
This thermostat is a 24VAC Heating and Cooling Digital Temperature
Control. It is designed for use on 4-pipe and 2-pipe fan coil systems
operating at 24VAC. Switching of load circuits is through relay
contacts, allowing the control to switch valves and fan relays. Fan
cycles on/off automatically with calls for heating or cooling. Two
speed fan stages for high and low speed operation. This thermostat
operates from a single setpoint with automatic changeover from
heating to cooling. There is built in programming to alter the control
characteristics to suit energy conservation needs.
Installation Notice:
This high performance digital thermostat is designed to provide many
years of superior comfort control when properly installed and maintained.
To achieve maximum performance, this device is designed to draw
room air into itself continuously. Reasonable care must therefore be
taken with regard to air quality at the time of installation as well as
during periods of normal use, see operating conditions below.
Operating Conditions:
The electronic mechanisms incorporated within this unit REQUIRE
operating conditions similar to other electronic devices intended for
INDOOR USE ONLY, such as would be acceptable for TV and similar
household appliances. Relative humidity must be less than 95% and
the atmosphere must be non-condensing. For operation in bathrooms,
shower or pool areas, outdoor entryways, greenhouses and similar
applications, order HSK-4024U or NPK-4024U. These products
include protection for coastal/tropical applications, therefore they are
suitable for use in high humidity environments. Air quality must be
maintained FREE of heavy dust or debris which may infiltrate the
interior of this device. Installation in any space which is unfinished
or undergoing repainting or general rehabilitation is also considered
product abuse. This device should be removed from service during
any local construction activity.
Cleaning:
This device incorporates a high impact polycarbonate enclosure which
is easily cleaned with a dry cloth or vacuum brush. Occasional soiling
may be cleaned with a soft cloth lightly dampened with water and/or
mild cleaning solution. IN NO CASE should this device be directly
sprayed with or exposed to free flowing liquids, including water, which
could penetrate its interior.
FAILURE TO OBSERVE ANY OF THE ABOVE CONDITIONS OF USE
WILL COMPLETELY VOID THE SUPPLIER WARRANTY.
CAUTION
MAKE SURE UNIT IS PROPERLY CONNECTED. DAMAGE TO THE
DIGITAL CONTROL CAN BE CAUSED BY MISWIRING, WHICH WILL
VOID THE WARRANTY. FOR SAFETY REASONS ALWAYS USE
WIRE NUTS ON ALL WIRE CONNECTIONS!!!
User Note: The top of this unit will become warm to the touch. This is a
normal operation. Internal heating is employed to continuously convect
air upward through the thermostat, thereby improving room air temperature
measurement. Direct conflict with a downward ceiling fan or system fan air
flow may result in false temperature reading. Locate thermostat to avoid
interference.
Specifications:
Temperature Monitor Range: 32.0°F to 99.9°F (0.0°C to 37.7°C)
Setpoint Range: 60.0°F to 85.0°F (15.5°C to 29.5°C)
*Setpoint Default: 72°F (22°C)
*Comfort Conditioning Limit Defaults: 65.0°F (18.5°C) cooling
85.0°F (29.5°C) heating
Display Format: Liquid Crystal Display (LCD)
Sampling Rate: Every 5 seconds
Accuracy: ± 1°F (0.5°C)
Power Source: 24VAC
Load Rating: 1.5 Amps per load circuit
*Fan Control: Selectable: Auto cycle, Low, High
Heat/Cool Control: 1 heat and 1 cool circuit
*Default Temperature Extreme Prevention Limits:
Maintains room temperature between 60.0°F and 85.0°F
(15.5°C and 29.5°C) when thermostat is in economy mode
*Fan Purge Timer: 30 seconds default
programmable 0 (off) to 180 seconds
Anti-short Cycle: 3 minute hold in no call state at all times
*Cycle Rate: 8 cycles per hour
*See Field Programming Instructions
Old thermostat
wire function
Power Feed
Common
Heat
Cool
Low Fan
Medium Fan
High Fan
Cable
wire color
4-Pipe Fan Coil Installation:
This device should be installed and serviced by a qualified technician.
Junction box mounting is highly recommended.
1. Caution: Make sure that power has been disconnected.
2. All wiring must comply with applicable codes and ordinances.
3. A thorough check-out of the system should be made after
installation is complete.
4. If retrofitting old thermostat, remove old thermostat from the
junction box, carefully noting the wire connections on the old unit.
Record wire color and terminal legends in spaces provided.
Disconnect old thermostat and remove any existing backplate or
mounting plate.
Retrofitting with Existing Control Wiring:
Most 3 speed fan system's control
wiring is sufficient to connect this 2
speed thermostat without adding a
common wire. This connection is
achieved by using the third fan speed
wire as a common. Disconnect the
unused fan speed wire from the fan
motor and connect it to *Common.
Be sure to insulate the unused fan
motor wire to prevent shorts. At the
thermostat, connect the unused fan
speed wire (now neutral) to the
thermostat.
XUnused Speed
Low Speed
High Speed
High Fan
(Yellow w/red str)
Low Fan
(Green)
Common (Gray)
*Common
Cut Wire
Cool (Yellow)
Heat (White)
Load Feed (Orange)
Control Feed (Red)
Fan Relays
HIGH
LOW
AUTO
ECONOMY
°F/°C
Decrease
Temperature
Switches between
°F and °C
Selects
Fan/Economy
Function
Increase
Temperature
Installation and Operating Instructions
HS/HSK-4024U
NP/NPK-4024U
1

6. From the wire chart found in step 4, assign, according to function,
the cable wire colors to the thermostat wire legend provided below.
Note: The control feed and the load feed will be connected together
for the 4-pipe installation. If this is a new installation, record the cable
wire colors in the thermostat legend provided below.
Note: There is no medium fan in the thermostat. The wire for the
medium fan needs to be tied off following standard procedures.
New thermostat
wire function
Control Feed
Load Feed
Common
Heat
Cool
Low Fan
High Fan
New thermostat
wire color
Red
Orange
Gray
White
Yellow
Green
Yellow w/Red Stripe
Cable
wire color
7. Connect the thermostat wires to the cable wires recorded in Step 6.
8. Push the wires into the junction box. Tilt
the thermostat so that the bottom of the
thermostat is resting on the mounting tabs
of the mounting plate. Push the top of the
thermostat towards the wall and secure into
place with the self-tapping screw as shown
to the right.
Standard
Junction
Box
9. Turn power on.
At start up, the fan will automatically run
for three minutes to cycle room air.
BASIC FUNCTIONS
Adjust Temperature Setpoint:
Press up button ( ) to raise the temperature (warmer)
Press down button ( ) to lower the temperature (cooler)
ECONOMY
Screw: 6/32 x 3/4"
Mounting Bracket
Standard
Junction
Box
5. Install the mounting bracket to the
junction box with the two long
mounting screws provided.
See mounting detail to the right.
Note: If application involves a
double ganged junction box,
a backplate will be required for a
complete installation.
Please consult your supplier.
Select Fan Operation:
Press fan button ( ) to select the following fan functions*
Continuous HIGH speed fan
Continuous LOW speed fan
AUTO on/off with automatic speed change
ECONOMY
*fan function sequence with auto as the starting point
Change Scale Units:
Slide the °F/°C switch to the left to display °F
Slide the °F/°C switch to the right to display °C
When the °F/°C switch is invoked, the thermostat will reset and
display the default setpoint in the selected scale. The default
setpoint (unprogrammed) is 72.0°F or 22.0°C.
Cycle Timing: (Anti-short cycle protection)
3 minute (minimum) dwell time in no-call states
(both heat and cool).
1 minute (minimum) dwell time in call states
(both heat and cool).
Temperature is sampled every 5 seconds.
9510-0611 Rev -
9-27-05
Check Low Fan Function:
Press the fan button until the fan
indicator on the LCD moves to the
LOW fan position.
Low speed fan should turn on immediately.
Check High Fan Function:
Press the fan button until the fan indicator on
the LCD moves to the HIGH fan position.
High speed fan should turn on immediately.
Check Heating:
Press and hold the up button until the heat
symbol appears on the LCD. Within 4 seconds
the heat valve should be activated.
Note: Room temperature must be below the
Comfort Conditioning Heating Limit
85°F (29.5°C)
for heating to become active.
Wiring Diagram 4-pipe Fan Coil
Green
White
Gray
Yellow w/red stripe
Yellow
Heat
Valve
Feed
Common
24VAC
Cool
Valve
High
Fan
Relay
Low
Fan
Relay
Red Orange
Red
Control
Feed
Door Switch, Motion Detector Wiring Diagram 4-pipe Fan Coil
Green
White
Orange Load Feed
Gray
Yellow w/red stripe
Yellow
Cool
Valve
Heat
Valve
24VAC Feed
Common
24VAC
High
Fan
Low
Fan
Door switch or motion detector control relay
must have a minimum of 3A rating. In open
position fan and valves will be deactivated.
In closed position fan and valves will be
activated.
°F/°C
Fan
°F/°C
Fan
Indicator
°F/°C
Up
Button
Heat
Symbol
°F/°C
2

From the wire chart found above, assign, according to function, the
cable wire colors to the thermostat wire legend provided below. If this
is a new installation, record the cable wire colors in the thermostat
legend provided below.
Note: There is no medium fan in the thermostat. The wire for the
medium fan needs to be tied off following standard procedures, unless
used as a neutral. See Figure 1.
2-Pipe Fan Coil Installation:
Follow the instructions for a 4-Pipe installation with the following
exceptions.
NOTE: Fan will cycle only with calls for heating or cooling.
Continuous fan is not available on 2-pipe systems.
Old thermostat
wire function
Power Feed
Load Feed
Common
Heat
Cool
Low Fan
Medium Fan
High Fan
Cable
wire color
New thermostat
wire function
Control Feed
Load Feed
Common
Heat
Cool
Low Fan
High Fan
New thermostat
wire color
Red
Orange
Gray
White
Yellow
Green
Yellow w/Red Stripe
Cable
wire color
(Continue on reverse side) 9510-0611 Rev -
9-27-05
Check Cooling:
Press and hold the down button until the
cool symbol appears on the LCD. Within
4 seconds the cool valve should be activated.
Note: Room temperature must be above the
Comfort Conditioning Cooling Limit
65°F (18.5°C) for cooling to become active.
TROUBLE SHOOTING TESTS (4-Pipe System)
Voltage: When using a voltmeter across "Gray" and "Red", the
voltage must be 24VAC.
To Check Continuity: (Using a Voltmeter with all loads connected)
A) When thermostat is calling for Cooling, meter should read
24VAC from "Gray" to "Yellow". When Cooling is deactivated,
meter should read 0VAC from "Gray" to "Yellow".
B) When thermostat is calling for Heating, meter should read
24VAC from "Gray" to "White". When Heating is deactivated,
meter should read 0VAC from "Gray" to "White".
C) When thermostat is calling for High fan, meter should read
24VAC from “Gray” to “Yellow w/Red Stripe”. When High fan is
deactivated, meter should read 0VAC from “Gray” to “Yellow
w/Red Stripe”.
D) When thermostat is calling for Low fan, meter should read
24VAC from “Gray” to “Green”. When Low fan is deactivated
meter should read 0VAC from “Gray” to “Green”.
Adjust setpoint as follows:
4°F (2°C) or more ABOVE room temperature
2°F to 4°F (1°C to 2°C) ABOVE room temperature
Within 0°F to 2°F (0°C to 1°C) of room temperature
2°F to 4°F (1°C to 2°C) BELOW room temperature
4°F (2°C) or more BELOW room temperature
Function Test:
HIGH
LoHi Hi
LoLo Hi
Lo Hi
LoLo Hi
Lo HiHi
On
On
LOWAUTOCOOLHEAT
FAN SPEEDSYSTEM
On
On
Stop(Dead band)*
*Deadband: Active on start-up or initial call for heating or cooling
Aquastat (mounted on water
supply line) or season change
switch
Wiring Diagram 2-pipe Fan Coil
Green LOW
White
Control
Feed
Red
Gray
Yellow w/red stripe HIGH
Yellow
Valve
24VAC Feed
Common
24VAC
Orange
High
Fan
Low
Fan
Note: Fan will cycle with
heat or cool only
Cool pipe
position
Hot pipe
position
Down
Button
Cool
Symbol
Change
Scale
°F/°C
Red
Control
Feed
Door Switch, Motion Detector Wiring Diagram 2-pipe Fan Coil
Green
Yellow COOL
White HEAT
Gray
Yellow w/red stripe
Orange
Valve
24VAC Feed
Common
24VAC
High
Fan
Low
Fan
Door switch or motion detector control relay
must have a minimum of 3A rating. In open
position fan and valves will be deactivated.
In closed position fan and valves will be
activated.
Aquastat (mounted on water supply line)
or season change switch
3

PSG Controls, Inc.
LIMITED WARRANTY POLICY
PSG Controls, Inc. (Hereinafter referred to as "PSG") warrants the following:
Only cataloged products sold to distributors are warranted to the original purchaser, to
conform with specifications furnished or approved by PSG, and to be free from defects in
material and workmanship, for a period of one (1) year from the date of purchase, unless
specified in writing for a different period.
Any PSG product that proves defective within the above described warranty period will
be repaired or replaced (at PSG's option) free of any charge if returned to the PSG
factory at 1225 Tunnel Road, Perkasie, PA. 18944 with transportation charges prepaid.
Prior to returning this product to PSG, the purchaser shall give PSG notice in writing
stating how this product fails to fulfill this warranty. No product shall be accepted for
repair or replacement without a required written notice and without prior written
authorization and shipping instructions having been received by the purchaser from
PSG. Only PSG's factory is authorized to perform services under this warranty.
This warranty does not extend to any product that has been subjected to misuse, abuse,
neglect, accidents, alterations, improper installation or use in violation of the printed
instructions furnished by PSG. This warranty neither applies to batteries nor
deterioration of, nor damage to the product caused by the use of faulty batteries. Final
determination as to whether any product is actually defective rests solely with PSG.
This warranty is expressly in lieu of all other agreements and warranties, expressed,
implied, or statutory and PSG has no other obligations or liabilities in connection with this
product. In no event shall PSG's obligation or liability hereunder exceed the purchase
price of this product. PSG SHALL NOT IN ANY EVENT BE LIABLE FOR ANY
INCIDENTAL OR CONSEQUENTIAL DAMAGES. This warranty gives you specific legal
rights, and you also have other rights which vary from state to state. Some states do not
allow the exclusion or limitation of incidental or consequential damages, or implied
warranties, so the above limitations or exclusion may not apply to you.
Toll free technical assistance is available
via our technical hotline: [phone]
Mon-Fri, 8:00 A.M. to 4:30 P.M. Eastern Standard Time?
PSG Controls, Inc.
SETTING NEW STANDARDS IN TEMPERATURE CONTROLS
1225 Tunnel Road - Perkasie, PA 18944 - 215-257-3621 - Fax [phone]
Web site - www.psgcontrols.com E-mail - [email protected]
R
Diagnostic Mode:
Check Heating:
**Press and hold the up button until the heat
symbol appears on the LCD. Within 4 seconds
the heat valve should be activated.
Note: Room temperature must be below the
Comfort Conditioning Heating Limit
85°F (29.5°C)
for heating to become active.
Check Cooling:
**Press and hold the down button until the
cool symbol appears on the LCD.Within 4
seconds the cool valve should be activated.
Note: Room temperature must be above the
Comfort Conditioning Cooling Limit
65°F (18.5°C) for cooling to become active.
** To check heating/cooling will depend on the
temperature or position of the season switch.
Press and hold the "up" and "down" buttons
together until "DIAG" appears on the display.
Release the buttons.
Diagnostic mode will alternately display setpoint
and room temperature every 8 seconds.
The current setpoint is displayed with the °F and
"PRESS OR TO SET".
The room temperature is displayed without the
°F and "PRESS OR TO SET". Both setpoint
and room temperature displays will indicate the
fan speed activity and "DIAG".
TROUBLE SHOOTING TESTS (2-Pipe System)
Voltage: When using a voltmeter across "Gray" and "Red", the
voltage must be 24VAC.
To Check Continuity: (Using a Voltmeter with all loads connected)
Cooling: supply pipe aquastat or season change switch to cool
A) When thermostat is calling for Cooling and Low Fan, meter
should read 24VAC from "Gray" to "Orange" and from "Gray"
to "Green". When Cooling is deactivated, meter should read
0VAC from "Gray" to "Orange" and from "Gray" to "Green".
B) When thermostat is calling for Cooling and High Fan, meter
should read 24VAC from "Gray" to "Orange" and from "Gray"
to "Yellow w/Red Stripe". When Cooling is deactivated, meter
should read 0VAC from "Gray" to "Orange" and from "Gray" to
"Yellow w/Red Stripe".
Heating: supply pipe aquastat or season change switch to heat
A) When thermostat is calling for Heating and Low Fan, meter
should read 24VAC from "Gray" to "Orange" and from "Gray"
to "Green". When Heating is deactivated, meter should read
0VAC from "Gray" to "Orange" and from "Gray" to "Green".
B) When thermostat is calling for Heating and High Fan, meter
should read 24VAC from "Gray" to "Orange" and from "Gray"
to "Yellow w/Red Stripe". When Heating is deactivated, meter
should read 0VAC from "Gray" to "Orange" and from "Gray" to
"Yellow w/Red Stripe".
Up
Button
Heat
Symbol
°F/°C
Down
Button
Cool
Symbol
Change
Scale
°F/°C
Up
Button
HIGH
LOW
AUTO
ECONOMY
°F/°C
Down
Button
Current Setpoint
Display
HIGH
LOW
AUTO
ECONOMY
°F/°C
Room Temperature
Display
HIGH
LOW
AUTO
ECONOMY
°F/°C
Economy Mode
Display
HIGH
LOW
AUTO
ECONOMY
Up
Button
Fan
Button
°F/°C
Down
Button
To deactivate the diagnostic mode, press the
"fan" button until the fan activity pointer moves
to "ECONOMY". "DIAG" will disappear from
the display. Diagnostic mode can also be
deactivated by changing the °F/°C slide switch.
Press the "fan" button again to return to
operating mode.
4