Greenheck Fan Make-Up Air Unit VSU - Manual (Page 6)

6 Model VSU Make-Up Air
® ® ® ® ®
Installation of Direct Gas Piping
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
If pressure testing in excess of 1/2 psig (3.5 kPa),
the heater and manual shutoff valve must be
disconnected from the supply gas line.
WARNING
If pressure testing at or below 1/2 psig (3.5 kPa), the
heater must be isolated from the supply gas line by
closing its manual shutoff valve.
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.
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.
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 ∆T
∆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
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 (by others) 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 Greenheck.
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.
Direct Gas Nameplate