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OMEGA-VSHP.G-IOM-2103
8
temperatures will increase unit operating efficiency.
Operation of riser loop temperatures above 110
o
F EWT
is not permitted. If loop temperatures are close to maxi-
mum permissible levels, riser loop can experience water
temperature spikes above recommended during peak
demand loads. Refer to ‘Unit Operation Limits”.
Heating Season
In heating mode riser loop temperatures must be main-
tained within 55
o
F to 90
o
F for standard range operation.
For Low Temperature Water (LTW) operation, riser loop
temperature are permitted down to 45
o
F with water only
risers systems. In Geothermal Range operation the sys-
tem loop must contain an appropriate glycol mixture to
protect the system from freezing the water circuit. For
Geothermal operation units must come with factory Geo-
thermal Range option. Do not operate riser system be-
low 20
o
F EWT due to reduced heating capacity and effi-
ciency. See Table 2.
Operating Limits
Table 2: Unit Operation Limits
Design limits can not be combined. Combin-
ing maximum or minimum limits is not al-
lowed. This could exceed the operation and
design limits of the unit.
For example: It is not allowed to combine maximum en-
tering air temperature (EAT) limits with maximum enter-
ing fluid temperature (EFT) limits.
6. CHASSIS INSTALLATION
Do not apply plumbers putty, pipe dope or
sealing tape to NPSM water fittings.
Always use a back-up wrench when tightening
hoses or fittings. Damage to copper pipes and
solder joints could result in serious equipment
and property damage.
Check hoses and fittings for any visible dam-
age or debris.
INSTALLATION OF FITTINGS AND HOSES
Upon removal of service cover panel check cabinet inte-
rior for construction debris and dust. Clean out all dust
and debris.
Close riser shut-off valves and disconnect factory hoses
from riser supply or return shut off valves.
Units with NPSM Riser and Chassis Fittings
Connect the supplied hoses to the Male-NPSM riser
shut-off valves. Do not apply pipe dope or pipe sealant
to NPSM fittings.
Always use a back-up wrench
.
Fin-
ger tighten hose and tighten with back-up wrench
approximately 1/6 turn. DO NOT OVERTIGHTEN
.
Units with NPT Riser and Chassis Fittings
Connect the supplied male-male (NPT/ NPSM) cou-
plings to the Female-NPT supply and return riser shut-
off valves.
Do not apply pipe dope to the NPSM fit-
tings, as these are flare style fittings.
Connect the supplied hoses to the riser shut-off valves.
Always use a back-up wrench
.
DO NOT OVERTIGHT-
EN
.
CHASSIS INSTALL
1. Remove chassis packaging, leaving cardboard ship-
ping cover on the air coil cover in place. Check chassis
nameplate to verify chassis model matches cabinet
model for compatibility.
2. Align chassis with front of the cabinet and tilt chassis
so that the back aligns with the cabinet rails.
3. Slide chassis into cabinet partially. Check to ensure
wiring harnesses are not being pinched. Adjust the chas-
sis to ensure it is resting approximately centered in the
rails.
4. Connect the hoses by hand to the chassis supply and
return connections. Hand tighten, then using a back-up
wrench tighten fittings as necessary. Ensure that the
hose supply and return connections are not reversed
and matched to correct risers. Water IN and water OUT
is stamped on the chassis sheet metal enclosure.
5. If riser loop system has been commissioned and oper-
ational open the riser shut-off valves. Check for any
signs of water leaks at all water connection points.
Heating
DB
WB
DB
Std. Entering Air Temperature (EAT)
75
o
F
63
o
F
68
o
F
Min. Entering Air Temperature (EAT)
65
o
F
55
o
F
50
o
F
Max. Entering Air Temperature (EAT)
85
o
F
71
o
F
80
o
F
Cooling
Heating
Cooling
Heating
Cooling
Heating
Std. Entering Fluid Temperature (EFT)
85
o
F
70
o
F
85
o
F
55
o
F
85
o
F
60
o
F
Min. Entering Fluid Temperature (EFT)
50
o
F
55
o
F
50
o
F
45
o
F
30
o
F
20
o
F
Max. Entering Fluid Temperature (EFT)
110
o
F
90
o
F
110
o
F
90
o
F
110
o
F
90
o
F
Cooling
Air Limits
Standard Range
Low Temp Water Range
Fluid Limits
Geothermal Range
Min. CFM/Ton
300
Min. GPM/Ton
1.5
Design CFM/Ton
400
Design GPM/Ton
3
Max. CFM/Ton
450
Max. GPM/Ton
4
Fluid GPM Limits
CFM Limits