OMEGA | WATER SOURCE HEAT PUMPS
OMEGA-VSHP.F-IOM-1907
7
www.omega-heatpump.com
4.Swaged sections are approximately 3 inches deep.
Risers should be inserted at a depth of approximately 2
inches into the 3 inch deep swage. Confirm risers pene-
trate at a minimum of 1 inch into the swage. Do not allow
the riser tailpiece to bottom out fully into the 3 inch deep
swage. This will allow for floor to floor variations, other-
wise riser overlap may not be sufficient on upper floors.
See Figure 6.
5. Align and center riser positions in the pipe chase and
level cabinet as necessary.
6. Secure the cabinet to the floor. Cabinet base comes
with factory mounted neoprene pads.
7. Center the riser stub-outs in the cabinet openings to
allow for riser expansion and prevent contact with cabi-
net sheet metal. Prevent riser stub-outs from contacting
sheet metal pass through otherwise damage to stub-
outs may occur, resulting in serious water damage. See
Figures 7 & 8.
8. Secure risers to building structure as per engineering
design specifications. Do not allow the risers to be sup-
ported by the cabinets. Field supplied riser compensa-
tors are required if the temperature range of the system
exceeds the expansion and contraction limit.
9. Using industry accepted soldering and brazing stand-
ards and materials to solder or braze the riser joints.
10. Connect supply ducts and discharge grilles. See
Figure 11.
11. Optional Fresh Outside Air Duct details are shown in
Figures 12 & 13 when connecting to remote ERV.
RISER LOOP
Servicing
To enable system flushing, servicing and balancing of
supply and return risers the following field supplied com-
ponents are required: shut-off valves, drain tees and
drain valves, and flow measuring devices. Refer to the
job site engineering design specifications and building
drawings for more detailed information.
Flushing & Cleaning
Once the riser system is complete the riser system must
be flushed, cleaned and chemically treated. Do not con-
nect chassis to the water circulating system when flush-
ing is being conducted to prevent debris and fouling of
the water side components of the chassis (i.e. auto bal-
ancing valve, auto shut-off valve, coaxial coil).
Do not flush and clean riser system with chas-
sis units connected. Do not allow the flushing
and cleansing solutions to flow in the chassis
water coil. Damage to water components may
occur.
Supply and return pipes must be interconnected, at a
minimum in the top and bottom units of each riser, with
factory supplied hoses to properly flush system and en-
sure adequate elimination of foreign material and clean-
ing of riser system.
1. Use only clean water to fill water circulation system.
Fill the water circulating system at the municipal water
makeup connection with all air vents opened.
2. After air vents have been sequentially closed and riser
system is primed begin water circulation of the system to
purge remaining trapped air bubbles.
3. Shut off the circulating pump and open all the drains
and vents to completely drain the system.
4. The riser system should be cleaned after the initial
flush and flushed a second time to adequately rinse the
riser system of cleaning solution.
Chassis installation is permitted once the riser system is
thoroughly flushed, cleaned, and commissioned by the
riser treatment company and contractor.
RISER SYSTEM LOOP TEMPERATURE
Correct riser system loop temperature settings are im-
portant for optimal unit operation. Temperatures outside
of the recommended range will affect overall unit operat-
ing performance (capacity and efficiency), long term
reliability and sound performance.
Cooling Season
In cooling mode recommended riser loop temperatures
should be maintained between 85
o
F to 90
o
F. Higher riser
loop temperatures reduce unit cooling capacity and effi-
ciency and increase sound levels. Lower riser loop tem-
peratures will increase unit operating efficiency.
Operation of riser loop temperatures above 110
o
F EWT
is not permitted, and sustained operation above 100
o
F
will reduce cooling capacity and may increase unit
sound levels and maintenance costs. If loop tempera-
tures are close to permissible levels, riser loop can ex-
perience water temperature spikes above recommended
during peak demand loads. Refer to Table 2: Unit Oper-
ation 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 Geothermal Range operation the system loop must
contain an appropriate glycol mixture where system loop
temperatures are low enough that could result in freez-
ing of the water circuit. For low temperature operation
units must come with factory Geothermal Range option.
Do not operate riser system below 20
o
F EWT due to
reduced heating capacity and efficiency. See Table 2.
