Operation & Maintenance Manual
VGB & HGB Series
Classroom Fan Coil Units
IMPORTANT: Read and save this manual for future reference.
This manual is to be left with the equipment owner
Form VGB-OM-MANUAL-Rev02
Table Of Contents
INTRODUCTION
About the Classroom Fan Coil unit
.………………………………………………………1
Nomenclature for Classroom Fan Coil units
………………………….……………………1
TYPICAL UNIT LAYOUT
Model VGB 1600 DDX / DCW
……………………………………….………………………2
Model VGB 1600 BCW / BDX
……………………………………….………………………3
Model HGB 1600 ……………………………………………………….………………………4
OPERATION
Control Strategy with Chilled Water Cooling, Electric or Hot Water Heating …………..……5
Control Strategy with DX Cooling, Electric or Hot Water Heating
…………………..……6
Chilled Water Circuit
.……………………………………………………………………….7
Refrigeration Circuit ………....……………………………………………………………….…….8
Electrical Circuit
……….….……………………………………………………………………9
Dampers
……….………….……………………………………………………………………9
Filtration
……….………….……………………………………………………………………9
MAINTENANCE
Servicing the Unit ………….………….………………………………………………………..10
Maintenance Schedule
….………….……………………………………………………..…10
Changing the Filters ………….………….……………………………………………………..…11
Cleaning the Evaporator Coils
…….………………………………………………………...11
Motors
………………………….…………………………………………………………...11
TROUBLESHOOTING
Basic Troubleshooting Guidelines …..…………………………………………………………..12
REPLACEMENT PARTS
Limited Warranty ..……………………...………………………………………………………13
Part Sales …………..………………………..…….…………………………………………....13
INTRODUCTION
ABOUT THE CLASSROOM FAN COIL UNIT
The Temspec VGB/HGB classroom fan coil unit is designed as means for providing
cooling, heating and ventilation to the classroom. Our goal is to help create an enhanced
learning environment by focusing on the following points when designing our equipment:
•
•
•
COOLING, HEATING, HUMIDITY AND VENTILATION
CONTROL
AIR DISTRIBUTION
SOUND ATTENUATION
By installing the VGB/HGB fan coil unit into the classroom, superior control can be obtained
for each room. Because the unit can be ducted, an even distribution of air can be achieved
throughout the room. The classroom fan coil unit is constructed with heavy gauge metal
and sound absorbing insulation for optimal sound attenuation.
By applying sound engineering principles and thorough testing, we ensure the highest
quality of performance in our unit ventilators.
NOMENCLATURE FOR CLASSROOM FAN COIL UNITS
V GB 1600 B CW
CW = Chilled water cooling
DX = Split system DX cooling
B=Blow through SA fan configuration
D=Draw through SA fan configuration
1600 = up to 1600 cfm of supply air
GB = Dual coil type of classroom fan coil unit
V=Vertical Unit
H=Horizontal
-1-
TYPICAL LAYOUT
Model VGB 1600 DDX / DCW (Upflow, Ducted Configuration)
S.A.
S.A.
1
2
3
13
4
93"
5
14
6
7
5
8
9
R.A.
10
O.A.
12
11
23"
33"
SIDE SECTION
S.A.
1.
2.
3.
4.
5.
6.
7.
Supply Air
FRONT ELEVATION
O.A.
Outdoor Air
8.
9.
10.
11.
12.
13.
14.
Supply air fan.
Optional electric coil.
Control / electrical enclosure.
Primary coil (DX or chilled water).
Drain pan.
Outdoor air coil (DX or chilled water).
Return air filter.
R.A.
Return Air
Heavy duty return air grille.
Outdoor air fan.
Outdoor air filter.
Outdoor air damper.
Optional electric freeze protection.
Coil access panel.
Return air access panel.
NOTE: The component arrangement shown above may vary slightly from that in the unit supplied.
-2-
TYPICAL LAYOUT
Model VGB 1600 BDX / BCW (Upflow, Freeblow Configuration)
S.A.
1
S.A.
S.A.
2
3
13
4
5
93"
6
14
7
8
4
9
R.A.
15
10
O.A.
12
11
23"
33"
SIDE SECTION
S.A.
Supply Air
FRONT ELEVATION
O.A.
Outdoor Air
8.
9.
10.
11.
12.
13.
14.
15.
1. Optional top plenum with double
deflection supply air grilles.
2. Optional electric coil.
3. Primary coil (DX or chilled water).
4. Drain pan.
5. Supply air fan.
6. Control / electrical enclosure.
7. Outdoor air coil (DX or chilled water).
R.A.
Return Air
Return air grille.
Outdoor air fan.
Outdoor air filter.
Outdoor air damper.
Optional electric freeze protection.
Coil access panel.
Return air access panel.
Heavy duty return air grille.
NOTE: The component arrangement shown above may vary slightly from that in the unit supplied.
-3-
TYPICAL LAYOUT
Model HGB 1600 (Horizontal, Ducted Configuration)
93"
Duct By
Others
1
2
5
3
9
7
Duct By
Others
11
O.A.
S.A.
23"
R.A.
4
6
8
10
SIDE SECTION
Suspension
Rods By
Others
12" x 10"
Supply Air
Opening
O.A.
12
R.A.
13
S.A.
14
33"
12
ISOMETRIC VIEW
(shown with left side access panel)
S.A.
1.
2.
3.
4.
5.
6.
7.
Supply Air
O.A.
Outdoor Air
R.A.
Return Air
8. Drain pan. Drain pan is removable when
option for bottom access panels is selected.
9. Electrical / control enclosure.
10. Optional Electric heater.
11. Supply air fan.
12. Mounting brackets (4 per unit).
13. Left or Right side hinged filter access panel.
14. Left or Right side hinged coil access panel.
Outdoor air damper.
Outdoor air filter.
Outdoor air fan.
Heavy duty return air grille or duct collar.
Outdoor air chilled water or DX coil.
Return air filter.
Primary chilled water or DX coil.
NOTE: The component arrangement shown above may vary slightly from that in the unit supplied.
-4-
OPERATION
Control Strategy
For a Temspec VGB or HGB series classroom fan coil unit
with type “V” stand alone control package (thermostat model OC-3)
UNIT WITH CHILLED WATER COOLING, ELECTRIC OR HOT WATER HEATING
-5-
Control Strategy
For a Temspec VGB or HGB series classroom fan coil unit
with type “V” stand alone control package (thermostat model OC-3)
UNIT WITH DX COOLING, ELECTRIC OR HOT WATER HEATING
-6-
TYPICAL PIPING PACKAGE FOR OUTDOOR AIR AND PRIMARY CHILLED WATER COILS
The following is a typical piping schematic for a classroom fan coil unit. Please refer to the “shop
drawings” for a more specific layout.
Air
Vent
P.T.
Port
2 way
Contol
Valve
Balancing
Valve
Ball
Valve
Union
MIXED
AIR
RETURN 3/4"
RETURN - 1 1/4"
PRIMARY
CHILLED
WATER
COIL
P.T.
Port
Strainer
Ball
Valve
Union
SUPPLY 3/4"
SUPPLY - 1 1/4"
Drain Cock
Air
Vent
Balancing
Valve
P.T.
Port
Ball
Valve
Union
OUTDOOR
AIR
RETURN 3/4"
O.A.
CHILLED
WATER
COIL
P.T.
Port
2 way
Contol
Valve
Strainer
Union
Ball
Valve
SUPPLY 3/4"
INSIDE
CABINET
Drain Cock
-7-
OUTSIDE
CABINET
Refrigeration Circuit
The following is a typical split system refrigeration circuit.
Condenser
Coil
Primary
Compressor
PT
EXTERNAL SPLIT
CONDENSING UNIT
(PRIMARY)
Drier
1 2
Low
pressure
control
Sight
Glass
1
PT
Notes:
1
2
Line sizes between the
condensing unit(s) and
unit ventilator depend on
length and elevation
changes. Please see
additional information in
the installation
instructions.
or
ctric r
Ele Wate
t
o
H iliary
x
Au t
a
He
ary
Prim vap
E
il
Co
Field install a sight glass
on the liquid line leaving
the primary condensing
unit.
V
TX
High
pressure
control
PT
PT
Out
Door
Air
Evap
Coil
Outdoor Air
Damper
TEMSPEC HGB
AIR HANDLER
IN CLASSROOM
TXV
1
1
APR CONTROLS
ENCLOSURE
(WITH CONDENSING UNIT)
APR Control
Twined Equalizer Line
Sight
Glass
PT
Low
pressure
control
Condenser
Coil
High
pressure
control
Outdoor Air
Compressor
PT
PT = Pressure Tap
EXTERNAL SPLIT
CONDENSING UNIT
(OUTDOOR AIR)
Drier
-8-
Electrical Circuit
The electrical circuit in the unit ventilator is highly dependent on the controller and
sequence that is being utilized. The unit can be supplied with a 115V, 208V, 277V or 460V
power. Each unit comes standard with an unfused disconnect. A copy of the electrical
schematic can be found folded in a pouch inside of the unit.
Dampers
The outdoor air damper is controlled by a spring return damper actuator. The damper
actuator will close the outside air damper upon loss of power. The damper actuator
manufacturer can vary. Please refer to the wiring schematic for the damper actuator model
type.
Filtration
Typically 2” disposable filters are provided in the unit. Please refer to the “shop drawings”
for specific details on filter construction and thickness. Below are typical filter sizes.
Location
Filter Size
Return Air
12” x 24” x 2” nominal
2
Outdoor Air
12” x 24” x 2” nominal
1
-9-
Quantity Per Unit
MAINTENANCE
Servicing The Unit
Access to the components is gained by removing the front access panels. Typically the
panels are fastened by heavy duty Phillips head screws. When removing the access panel
(vertical style units), loosen but do not remove the screws. Carefully store the panel in a
place where it will not get damaged. The horizontal style units utilize hinged access
panels.
CAUTION: Disconnect power before servicing the unit.
The filter access panels have a “kill switch” installed that will shut the supply air fan off once
the panel is removed. This will only disconnect the power to the supply air fans. Be sure to
disconnect ALL power by turning the remote disconnect switch to the off position.
Maintenance Schedule
Frequency maintenance greatly depends on the surrounding conditions (inside and outside
of the building). The following is a typical maintenance schedule for a classroom fan coil
unit.
Every 3 months
– Change filters
Every 12 months
– Vacuum out drain pans
– Clean strainer in hydronic circuit (if applicable)
Every 24 months
– Clean evaporator coils
– Vacuum any loose debris from interior of the unit
– Inspect dampers to ensure that there is a proper seal when closed
-10-
Changing the Filters
The outdoor and indoor conditions will determine the frequency of filter changes. Temspec
recommends that the filters be changed every 3 months as a rule-of-thumb. Note that dirty
filters will affect the overall performance of the unit.
To change the filters, open / remove the filter access panel by loosening the Phillips head
screws. Unclip the outdoor air filter. Both the outdoor air and the return air filters slide out.
Remove and replace.
Cleaning the Evaporator Coils
To clean the evaporator coil, purchase a suitable evaporator coil cleaning solution such as
those offered by NU-CALGON (www.nucalgon.com). Follow the manufacturers instructions
for use.
Note: Chlorine based or anti-fungal “pucks” or “socks” are acceptable when placed in the
evaporator drain pan. Be sure to vacuum the drain pan during the cleaning process.
If the filters are regularly changed, the heating coils do not require cleaning.
WARNING: Do NOT use chlorine based cleaners or anti-fungal treatments on the
aluminum fins of coil.
Motors
Temspec provides motors that are permanently lubricated. No maintenance is required.
-11-
TROUBLESHOOTING
Basic Trouble Shooting Guidelines
Problem
Action Required
●Supply fan not running
●Verify that the disconnect is in the on position
●Verify that thermostat / controller is not in
unoccupied mode (night set-back)
●Check the fan relay to see if it energizing and deenergizing properly
●Check to see if the 24V transformer is defective
●Ensure that wire connections are secured
properly
●Check to see if motor is burned out
●Outdoor air fan does not
supply enough air
●Adjust the fan speed control located in the unit.
●Check to see if the unit has a proper seal from
the back of the unit to the outside louver. NOTE:
If the return air measurement combined with the
outdoor air measurement does not equal the
supply air measurement, then there is air leakage
in the system.
-12-
REPLACEMENT PARTS
Limited Warranty
TEMSPEC INCORPORATED warrants the equipment from factory defects in material or
workmanship for a period of one year.
For this warranty to be valid, the unit(s) must be installed and maintained in accordance
with the manufacturer’s printed instructions. It does not cover parts damaged by
vandalism, improper installation, maintenance or abuse.
Should any replacement parts be required within the warranty period, they will be supplied
at no charge, freight prepaid to the jobsite. The cost of labor or incidental expenses
incurred in the repair or replacement of parts does not form part of this warranty.
The warranty period commences from the date of shipment, except when otherwise agreed
at the point of sale (see specific warranty terms and conditions for details).
Parts Sales
Contact the factory at:
1-888-TEMSPEC or (905) 670-3595
sales@temspec.com
Ask for ‘ parts sales ’
Be sure to provide the unit serial number which is located on the metalized CSA label, on
the fan housing, inside the units.
-13-