Temspec VGB Series Manual

Operation & Maintenance Manual
VGB & HGB Series
Classroom Fan Coil Units
Form VGB-OM-MANUAL-Rev02
IMPORTANT: Read and save this manual for future reference.
This manual is to be left with the equipment owner

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Table of Contents
INTRODUCTION
About the Classroom Fan Coil unit .………………………………………………………2
Nomenclature for Classroom Fan Coil units ………………………….……………………2
TYPICAL UNIT LAYOUT
Model VGB 1600 DDX / DCW ……………………………………….………………………3
Model VGB 1600 BCW / BDX ……………………………………….………………………4
Model HGB 1600 ……………………………………………………….………………………5
OPERATION
Control Strategy with Chilled Water Cooling, Electric or Hot Water Heating …………..……6
Control Strategy with DX Cooling, Electric or Hot Water Heating …………………..……7
Chilled Water Circuit .……………………………………………………………………….8
Refrigeration Circuit………....……………………………………………………………….…….9
Electrical Circuit ……….….………………………………………………………………..…10
Damper ……….………….………………………………………………………………..…10
Filtration ……….………….………………………………………………………………..…10
MAINTENANCE
Servicing the Unit ………….………….………………………………………………………..11
Maintenance Schedule ….………….……………………………………………………..…11
Changing the Filters………….………….……………………………………………………..…12
Cleaning the Evaporator Coils …….………………………………………………………...12
Motors ………………………….…………………………………………………………...12
TROUBLESHOOTING
Basic Troubleshooting Guidelines…..…………………………………………………………..13
REPLACEMENT PARTS
Limited Warranty ..……………………...………………………………………………………14
Part Sales …………..………………………..…….…………………………………………....14
INTRODUCTION

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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.
ABOUT THE CLASSROOM FAN COIL UNIT
NOMENCLATURE FOR CLASSROOM FAN COIL UNITS
V=Vertical Unit
H=Horizontal
GB = Dual coil type of classroom fan coil unit
1600 = up to 1600 cfm of supply air
1600
GB
V
B=Blow through SA fan configuration
D=Draw through SA fan configuration
B
CW = Chilled water cooling
DX = Split system DX cooling
CW

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TYPICAL LAYOUT
O.A. Outdoor Air
11
10
1. Supply air fan.
2. Optional electric coil.
3. Control / electrical enclosure.
4. Primary coil (DX or chilled water).
5. Drain pan.
6. Outdoor air coil (DX or chilled water).
7. Return air filter.
O.A.
9
5
23"
S.A. Supply Air
SIDE SECTION
12
R.A.
8
7
6
4
1
2
S.A.
3
5
8. Heavy duty return air grille.
9. Outdoor air fan.
10. Outdoor air filter.
11. Outdoor air damper.
12. Optional electric freeze protection.
13. Coil access panel.
14. Return air access panel.
FRONT ELEVATION
R.A. Return Air
33"
14
13
S.A.
93"
NOTE: The component arrangement shown above may vary slightly from that in the unit supplied.
Model VGB 1600 DDX / DCW (Upflow, Ducted Configuration)

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TYPICAL LAYOUT
O.A. Outdoor Air
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).
11
10
9
O.A.
4
7
23"
SIDE SECTION
S.A. Supply Air
12
R.A.
8
5
3
2
6
4
S.A.
8. Return air grille.
9. Outdoor air fan.
10. Outdoor air filter.
11. Outdoor air damper.
12. Optional electric freeze protection.
13. Coil access panel.
14. Return air access panel.
15. Heavy duty return air grille.
FRONT ELEVATION
15
14
33"
R.A. Return Air
S.A.
13
S.A.
93"
1
NOTE: The component arrangement shown above may vary slightly from that in the unit supplied.
Model VGB 1600 BDX / BCW (Upflow, Freeblow Configuration)

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TYPICAL LAYOUT
SIDE SECTION
ISOMETRIC VIEW
(shown with left side access panel)
O.A. Outdoor Air
O.A.
1. Outdoor air damper.
2. Outdoor air filter.
3. Outdoor air fan.
4. Heavy duty return air grille or duct collar.
5. Outdoor air chilled water or DX coil.
6. Return air filter.
7. Primary chilled water or DX coil.
S.A. Supply Air
12
13
R.A.
Duct By
Others
O.A.
72 3 15
R.A. 46 8
93"
12" x 10"
Supply Air
Opening
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.
14
12
S.A.
33"
R.A. Return Air
911 Duct By
Others
10
Suspension
Rods By
Others
S.A. 23"
NOTE: The component arrangement shown above may vary slightly from that in the unit supplied.
Model HGB 1600 (Horizontal, Ducted Configuration)

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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

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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

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The following is a typical piping schematic for a classroom fan coil unit. Please refer to the “shop
drawings” for a more specific layout.
OUTDOOR
AIR
Drain Cock
O.A.
CHILLED
WATER
COIL
P.T.
Port
2 way
Contol
Valve
Strainer
MIXED
AIR
Drain Cock
Air
Vent P.T.
Port
PRIMARY
CHILLED
WATER
COIL
P.T.
Port
Union
Balancing
Valve
Strainer Union
Air
Vent P.T.
Port
Union
2 way
Contol
Valve
Balancing
Valve
OUTSIDE
CABINET
INSIDE
CABINET
SUPPLY 3/4"
Union
Ball
Valve
SUPPLY - 1 1/4"
RETURN - 1 1/4"
RETURN 3/4"
Ball
Valve
SUPPLY 3/4"
Ball
Valve
RETURN 3/4"
Ball
Valve
Warning: City water is very corrosive to brass Components. Provide water treatment as soon as the
system is charged to avoid premature leaks and/ or failure of internal components.
TYPICAL PIPING PACKAGE FOR OUTDOOR AIR AND PRIMARY CHILLED WATER COILS

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The following is a typical split system refrigeration circuit.
Out
Door
Air
Evap
Coil
Outdoor Air
Compressor
Twined Equalizer Line
PT
Drier
Condenser
Coil High
pressure
control
1
APR CONTROLS
ENCLOSURE
(WITH CONDENSING UNIT)
Sight
Glass
TEMSPEC HGB
AIR HANDLER
IN CLASSROOM
TXV
APR Control
Low
pressure
control
EXTERNAL SPLIT
CONDENSING UNIT
(OUTDOOR AIR)
PT = Pressure Tap
PT
1
PT
Electric or
Hot Water
Auxiliary
Heat
Notes:
Line sizes between the
condensing unit(s) and
unit ventilator depend on
length and elevation
changes. Please see
additional information in
the installation
instructions.
Field install a sight glass
on the liquid line leaving
the primary condensing
unit.
1
2
Outdoor Air
Damper
TXV
PT
High
pressure
control
Primary
Evap
Coil
Condenser
Coil
EXTERNAL SPLIT
CONDENSING UNIT
(PRIMARY)
Low
pressure
control
Drier
PT
1
Primary
Compressor
Sight
Glass
21
PT
Refrigeration Circuit

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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.
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.
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 Quantity Per Unit
Return Air 12” x 24”x 2” nominal 2
Outdoor Air 12” x 24” x 2” nominal 1
Electrical Circuit
Dampers
Filtration

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MAINTENANCE
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.
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
Servicing the Unit
Maintenance Schedule

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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.
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.
Temspec provides motors that are permanently lubricated. No maintenance is required.
Changing the Filters
Cleaning the Evaporator Coils
Motors

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TROUBLESHOOTING
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 de-
energizing 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.
Basic Trouble Shooting Guidelines

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REPLACEMENT PARTS
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).
Contact the factory at: 1-888-TEMSPEC or [phone]
[email protected]
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.
Limited Warranty
Parts Sales