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Water to Water Source Heat Pumps
IM 1072-1
Installation
Pre-Installation and Code Requirements
After removing the unit from the carton, immediately remove
the panels and inspect for any damage that might have occurred
during shipment. Report concealed damage immediately to the
transportation company and request inspection.
The electric power source must be the same voltage and
phase as shown on the serial plate. Line and low voltage wir
-
ing must be done in accordance with local codes or the national
electric code.
Make a survey of the final location for the unit before setting
it in place. The unit should be centrally located with respect to
the distribution system. Install the unit within a heated area.
Exposure to inclement weather conditions may cause freeze
damage that is not covered by the warranty.
Table 2: Capacity data
Model
H
eating (Btuh)
Cooling (Btuh)
036
48,200
34,300
048
58,200
42,100
060
67,200
46,000
072
85,500
62,200
120
129,000
94,500
150
170,400
122,140
180
237,000
157,000
240
290,900
202,400
300
339,720
221,800
360
416,900
284,700
420
493,200
358,600
Notes:
At standard rating conditions of:
Heating
- 100°F entering load water, 70°F entering source water.
Cooling
- 55°F entering load water, 85°F entering source water.
Mounting the Unit
The unit should be mounted level on a vibration absorbing
pad slightly larger than the base to provide isolation between
the unit and the floor. It is not necessary to anchor the unit to
the floor.
The electrical connections are accessible from the front. The
compressor can be accessed from either side. A minimum of 24"
clearance in front and sides of the unit should be provided to
allow sufficient room to make water and electrical connections.
If the unit is located in a confined space such as a closet, provi
-
sions must be made for unit servicing. Unit sizes 036 thru 072
may be stacked vertically (2 high) in tight mechanical rooms.
Piping the Unit
Both source and load connections must be at least as large
as the connections on the unit. The unit may be furnished with
either copper or optional cupronickel coil on either source or
load coaxial heat exchanger. Cupronickel should always be used
when chlorinated water or ground water which is high in min
-
eral content is the load or source load fluid. Never use flexible
hoses that are smaller (inside diameter) than that of the water
connection on the unit. Make sure hoses and pipes are suitable
for system water pressure and sized for proper flow rate.
The supply and the discharge pipes should be insulated to
prevent condensation damage caused by low water temperature
in the pipes.
If water hammer should occur during start-up or shut down,
slow closing diaphragm type solenoid valves should be used.
Placing the solenoid valve on the outlet side of the system helps
relieve this situation. Due to high pressure drop or poor throt
-
tling characteristics, globe and gate valves should not be used,
all flow valves should be ball type.
Domestic Hot Water Heat Recovery
The unit may have an optional factory installed waste heat
recovery feature. The heat recovery device is factory piped to
the refrigerant circuit of the unit. The plumbing to the water
tank and the power to the recovery pump are to be completed
in the field as required.
Care should be exercised in plumbing water lines to and
from the water heater.
Note:
It is important that both water lines be insulated. For
run less than 50 feet one way, use 1/2" O.D. water
lines on models sizes 036 thru 072. A run over 50 feet
should be avoided. On models 120 thru 420 specific
system data must be matched to industry standard
pipe sizing charts.
To make a connection to Hot Water Heat Recovery:
1. Turn off power or gas valves to the water heater.
2. Turn off water supply to the water heater.
3. Open hot water faucet and drain tank.
4. Connect tubing to “Heat Recovery Water Out” on the unit
and extend this line to the hot water heater. Attach to hot
water heater with fittings.
CAUTION
Improper water flow in the system due to piping, valving
or improper pump operating will void the warranty.
5. Connect tubing to “Heat Recovery Water In” on the unit
and extend this line to the water heater. Attach to cold water
supply. Place pump in this line.
6. Set water heater thermostat as follows:
Electric, Double element - Upper 125°F, Lower
minimum Gas, Oil or Single element - 125°F
7. Wire according to single phase diagram (
on page 14
) and
three phase diagram (
on page 18
and
on page 22
).
8. The piping and wiring are now complete. Turn on water
supply to water heater. With an open hot water faucet, al
-
low tank to fill. Bleed air from water lines. Check for water
leaks. Do not restore power to water heater until after you
have verified that the heat recovery unit is working and you
have hot water circulating back to the water heater. Restore
power to the water heater.
9. On start up of the unit, make the following operation checks:
■ Pump runs only when the compressor is on. Pump is
turned on by thermostat on compressor discharge
line.
■ All air is purged from water lines.
■ Verify water circulation to and from water heater.
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