Greenheck TSU Base Unit Manual (464441) - Manual (Page 7)

Make-Up Air Unit 7
®
Installation of Direct Gas Piping 1. Determine the Supply Gas Requirements
The unit’s direct gas nameplate states the requirements
for the gas being supplied to the unit. The direct gas
nameplate is located on the outside of the unit on the
control center side.
2. Install Additional Regulator if Required
When the supply gas pressure exceeds the maximum
gas pressure shown on the direct gas nameplate, an
additional regulator is required to reduce the pressure.
The regulator must have a listed leak limiting device or it
must be vented to the outdoors.
3. Connect the Supply Gas Line
A manual shut off valve (gas cock), 1/8 in. plugged test
port and 6 in. drip leg must be installed prior to the gas
train. The valve and the test port must be accessible for
the connection of a test gauge. Supply gas connections
must be made by a qualified installer and are not
furnished by manufacturer.
To
Controls
Gas Cock
From
Gas
Supply
6 in. Trap
1/8 in. Plugged Tap
Ground Joint Union
Supply Gas Line
NOTE
The regulator located inside the unit is used to adjust
the unit’s maximum output temperature.
Type of gas
“ W.C.
“ W.C.
“ W.C.
F
PSI
“ W.C.
“ W.C.
MAX BTU/HR
BTU/H MAX
NORMAL MANIFOLD
PRESSURE
PRESSION DÕADMISSION
NORMALE
MIN GAS
PRESSURE
PRESSION DE GAZ
MIN BURNER
PRESSURE DROP
PERTE MIN DE PRESSION
DANS LE BRULEUR
TYPE OF GAS
NATURE DU GAZ
MIN BTU/HR
BTU/H MIN
MIN GAS PRESSURE
FOR MAX OUTPUT
PRESSION DE GAZ MIN
POUR PUISSANCE MAX
MAX BURNER
PRESSURE DROP
PERTE MAX DE PRESSION
DANS LE BRULEUR
MAX GAS
PRESSURE
PRESSION DE GAZ
MAX
DESIGN ΔT
Δ
T NORMALE
EQUIPPED FOR
CONCU POUR
SCFM “ W.C.
EXTERNAL STATIC PRESSURE
PRESSION STATIQUE EXTERIEURE
AGAINST
CONTE
Maximum gas pressure
Minimum gas pressure for
maximum output
Direct Gas Nameplate
IMPORTANT
All gas piping must be installed in accordance
with the latest edition of the National Fuel Gas
Code ANSI/Z223.1 and any local codes that may
apply. In Canada, the equipment shall be installed
in accordance with the Installation Code for Gas
Burning Appliances and Equipment (CGA B149) and
Provincial Regulations for the class. Authorities having
jurisdiction should be consulted before installations
are made.
WARNING
All components of this or any other gas-fired heating
unit must be leak tested prior to placing the unit into
operation. A soap and water solution should be used
to perform this test. NEVER test for gas leaks with an
open flame.
WARNING
When leak testing pressures that are equal to or less
than 14 in. wc (3.5 kPa), first close the field-installed
shutoff valve to isolate the unit from the gas supply
line.
WARNING
When leak testing pressures that are above 14 in. wc
(3.5 kPa), close the field-installed shutoff valve,
disconnect the furnace and gas train from the gas
supply line and plug the supply line before testing.
IMPORTANT
All piping should be clean and free of any foreign
matter. Foreign material entering the gas train can
damage the valves, regulators and burner.
IMPORTANT
Do NOT connect the unit to gas types other than
what is specified and do NOT connect the unit to
gas pressures that are outside of the pressure range
shown on the label.
NOTE
When connecting the gas supply, the length of the
run must be considered in determining the pipe size
to avoid excessive pressure drop. Refer to a Gas
Engineer’s Handbook for gas pipe capacities.