Mammoth V-Cube Slim E-Series (Standard Versions) - Manual (Page 8)

8
MAMM-VCS-IOM-1EB (October 2011)
Supply Piping
1. All units should be connected to supply and return
piping in a two-pipe reverse return configuration. A
reverse return system is inherently self-balancing
and requires only trim balancing where multiple
quantities of heat pumps with different flow and
pressure drop characteristics exist in the same
loop. Check for proper water balance by measuring
differential temperature reading across the water
connections.
2. The piping may be steel, copper or PVC. Avoid
dissimilar metal fittings as they may corrode. If the
use of dissimilar metals cannot be avoided, use
dielectric isolation at that connection point
3. Supply and return run outs usually join the unit via
short lengths of high pressure flexible hose which
are sound attenuators for both unit operating noise
and hydraulic pumping noise. One end of the hose
should have a swivel fitting to facilitate removal for
service. Hard piping water connections is not rec-
ommended due to the possibility of vibration that
can damage connections or pipe joints or noise
attenuation. Any hard piped connections must con-
tain a union to facilitate removal of the piping or
unit.
4. Some flexible hose threaded fittings are supplied
with sealant compound. If not, apply Teflon tape to
provide a tight seal.
5. Supply and return shutoff valves are required at
each unit. The return valve is used for balancing
and should have a “memory stop” so that it can
always be closed off but can only be reopened to
the proper position for the flow required.
6. No unit should be connected to the supply and re-
turn piping until the water system has been cleaned
and flushed completely. After the cleaning and
flushing has taken place, the initial connection
should have all valves wide open in preparation for
the water system flushing.
Condensate Piping
1. Condensate piping can be steel, copper, or PVC.
Each unit includes a condensate connection.
2. The condensate disposal piping must be trapped.
The piping must be pitched away from the heat
pump not less than ¼” per foot. The unit is supplied
with a 1-1/4” male pipe fitting to accommodate the
condensate drain connection.
3. Do not locate any point in the drain system above
the drain connection of any unit.
4. The condensate piping system must be vented at
its highest point.