5
VERSATEC WATER-TO-WATER INSTALLATION MANUAL
General Piping
Each unit is equipped with FPT fittings for the water supply and return lines. For making the water connections to the
unit, a Teflon tape thread sealant is recommended to minimize internal fouling of the piping. Do not overtighten connections.
The water lines should be routed so as not to interfere with access to the unit. The use of a short length of high pressure
hose with a swivel type fitting may simplify the connections and prevent vibration.
Before final connection to the unit, the supply and return hose kits must be connected, and the system flushed to remove
dirt, piping chips and other foreign material. Normally, a combination balancing and close-off (ball) valve is installed at the
return, and a rated gate or ball valve is installed at the supply. The return valve can be adjusted to obtain the proper water
flow. The valves allow the unit to be removed for servicing.
The proper water flow must be delivered to each unit whenever the unit heats or cools. To assure proper flow, the use of
pressure/temperature ports is recommended to determine the flow rate. These ports should be located adjacent to the sup-
ply and return connections on the unit.
The proper flow rate cannot be accurately set without measuring the water pressure drop through the refrigerant-to-water
heat exchanger (See Pressure Drop Table, page 14 for water flow and pressure drop information). Normally about 3 GPM
flow rate per ton of cooling capacity (2.25 GPM per ton minimum) is needed.
Both source as well as load fluid piping must be at least as large as the unit connections on the heat pump (larger on
long runs). Unit may be furnished with either a copper or optional cupronickel coil on either source or load coaxial heat
exchangers. Copper is adequate for closed loop systems and ground water that is not high in mineral content. In condtions
anticipating moderate scale formation or in brackish water, a cupronickel heat exchanger is recommended.
Notes: Cupronickel should always be used when chlorinated water is used as the source or load liquid.
For process water applications, it is recommended that a secondary load heat exchanger be installed to prevent cor-
rosion to the unit's primary coaxial coil. In situations where scaling could be heavy or where biological growth such as iron
bacteria will be present, a closed loop system is recommended. Over a period of time, ground water unit heat exchanger
coils may lose heat exchange capability due to a buildup of mineral deposits. These can be cleaned only by a qualified ser-
vice mechanic as special pumping equipment and solutions are required.
Never use flexible hoses of a smaller inside diameter than that of the water connection on the unit and limit hose length
to 10 ft. per connection. Check carefully for water leaks.
MODEL A B C D
V036W 29.5 32.6 30.5 30.5
[74.9] [83.1] [77.5] [77.5]
V060W 29.5 32.6 30.5 30.5
[74.9] [83.1] [77.5] [77.5]
V080W 28.75 39.9 30.0 37.75
[73.0] [101.3] [76.2] [95.9]
V120W 28.75 39.9 30.0 37.75
[73.0] [101.3] [76.2] [95.9]
3/8”Threaded
Rod (by others) Vibrator
Isolator
Washer
(by others)
Hex Nuts
(by others)
Bolt and
Lockwasher
A
C
D
B
Figure 2: Hanger Locations and Assembly
CAUTION:
Water piping exposed to outside temperature may be subject to freezing.
Potable Water Systems
An optional domestic water coil is available on the 036 model to provide primary generation of domestic hot water. The
coaxial heat exchanger provides double-wall construction and is vented to allow installation in potable water systems.
General Installation Information (cont.)
Notes: Dimensions are inches [cm]. Rev. 11/23/05
