U-5 IOM 3
Ductwork
Water supply
Fasten the supply ductwork to the collar provided.
Use a flexible duct connection between the unit and
the supply duct. Make sure the blower wheel turns
freely and is centered before making the connection.
If a return air is used, it may be fastened to the
flanges on the filter guides. Make sure there is easy
access for filter replacement.
The discharge or supply air duct should be insulated
and have at least on 90-degree bend prior to the first
discharge grille. Heat pump life expectancy and
efficiency depends on adequate airflow. For nominal
cfm information see unit data sheet.
The heat pump must not be operated without water
flowing through its water-to-refrigerant heat
exchanger coils. Severe damage to the unit may
result.
For proper water flow rates, refer to the unit
specification sheet.
Condensate drain
See Figures 2 and 3
The condensate drain is set up for
7
⁄
8-inch O.D.
copper connection. The condensate pipe or hose
installed must have a minimum 3-inch trap in the
condensate line. All condensate piping must pitch
Figure 2. Condensate trap detail – bottom drain
Min. Trap
1.5-inch Min. Internal
Application limits
COOLING
STD. TEMP. LOW TEMP.
MINIMUM ENTERING WATER/BRINE 55 F 30 F
MAXIMUM ENTERING WATER 110 F 110 F
MINIMUM ENTERING AIR 60 F 60 F
MAXIMUM ENTERING AIR 100 F 100 F
HEATING
STD. TEMP. LOW TEMP.
MINIMUM ENTERING WATER/BRINE 50 F 25 F
MAXIMUM ENTERING WATER 90 F 90 F
MINIMUM ENTERING AIR 40 F* 40 F*
MAXIMUM ENTERING AIR 80 F 80 F
Only one maximum condition can exist at the same
time.
*Note: The minimum entering air temperature must
not fall below 40 F.
If the outside air is cooler than 40 F it must be
preconditioned or the unit must be shut off.
Mammoth offers both optional electric and hot water
preheat coils for this situation. See page 5 for
additional information on the heaters.
away from the unit for proper drainage by gravity and
as required by local codes. Condensate drains are
available as either standard side connection or
optional bottom connection.
Closed loop systems
1. Unit should be left unconnected or isolated using
gate valves as the building water loop is initially
flushed.
2. Water system should be filled with 1 lb. trisodium
phosphate for every 50 gallons of water.
3. The piping should then be purged of trapped air,
supplemental heater set to maintain 110 F and the
solution circulated for approximately 8 hours.
4. The system should then be drained completely
and the entire flushing process repeated, if
necessary.
5. After completely cleaned and drained, fill loop with
water at an alkaline level of approximatelly pH 7.5.
6. Connect heat pump the the piping loop.
7. Make sure all entrained air is purged from loop.
Determine that specified flow rate through each
unit is established.
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