Mammoth 2 to 6 Tons: High Efficiency, Superior IAQ Single Circuit Vertical (B-Vintage) - Manual (Page 7)

7
MAMM-WSHP-IOM-1BA (February 2012)
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. To ensure proper water flow, the
differential temperature should be between 10°F to
14°F for heat pumps in the cooling mode.
2. The piping may be steel, copper, or PVC. Avoid
dissimilar metal fittings as they may corrode. If the
use of dissimilar metals is unavoidable, use
dielectric isolation at that connection point.
3. Supply and return run-outs usually join the heat
pump via short lengths of high pressure flexible
hose which are sound attenuators for both heat
pump operating noise and hydraulic pumping
noise. One end of the hose should have a swivel
fitting to facilitate removal for service. Hard piping
can also be brought directly to the heat pump. This
option is not recommended since no vibration or
noise attenuation can be accomplished. The hard
piping must have a union to facilitate heat pump
removal.
4. Make sure that threaded fittings are sealed. Teflon
tape can be used to provide a tight seal.
5. Supply and return shutoff valves are required at
each heat pump. 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.
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.
Units are internally trapped. The piping must be
pitched away from the heat pump not less than ¼”
per foot. The unit is supplied with a male pipe fitting
(3/4”) 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.
IMPORTANT:
Prior to first operation of B-Vintage units, the water
circulation system must be cleaned and flushed of all
construction dirt and debris. After the cleaning
and flushing has taken place, the initial connection
should have all valves wide open in preparation for
start-up.