Piping Installation - Heat Controller HTV Series Installation, Operation & Maintenance Instructions Manual

Heat Controller, Inc.

Piping Installation

INSTALLATION OF SUPPLY AND RETURN
PIPING
Follow these piping guidelines
1. Install a drain valve at the base of each
supply and return riser to facilitate system
flushing.
2. Install shut-off / balancing valves and
unions at each unit to permit unit removal
for servicing.
3. Place strainers at the inlet of each
system circulating pump.
4. Select the proper hose length to allow
slack between connection points.
Hoses may vary in length by +2% to -4%
under pressure.
5. Refer to Table 1. Do not exceed the
minimum bend radius for the hose
selected. Exceeding the minimum bend
radius may cause the hose to collapse,
which reduces water flow rate. Install
an angle adapter to avoid sharp bends in
the hose when the radius falls below the
required minimum.
Insulation is not required on loop water piping
except where the piping runs through
unheated areas, outside the building or when
the loop water temperature is below the
minimum expected dew point of the pipe
ambient conditions. Insulation is required if
loop water temperature drops below the dew
point (insulation is required for ground loop
applications in most climates).
Pipe joint compound is not necessary when
Teflon® thread tape is pre-applied to hose
assemblies or when flared-end connections
are used. If pipe joint compound is
preferred, use compound only in small
amounts on the external pipe threads of the
fitting adapters. Prevent sealant from
reaching the flared surfaces of the joint.
HTV/HTD/HTH SERIES
PIPING INSTALLATION
Note: When anti-freeze is used in the
loop, insure that it is compatible with the
Teflon tape or pipe joint compound that is
applied.
Maximum allowable torque for brass fittings
is 30 ft-lbs. If a torque wrench is not
available, tighten finger-tight plus one
quarter turn. Tighten steel fittings as
necessary.
Optional pressure-rated hose assemblies
designed specifically for use with Heat
Controller units are available. Similar
hoses can be obtained from alternate
suppliers. Supply and return connections
are fitted with swivel-joint fittings. To
prevent kinking during installation, make all
connections before final attachment to the
unit.
Install hose assemblies properly and check
regularly to avoid system failure and
reduced service life.
Table 1: Metal Hose Minimum Bend Radii
9
12
⌧ CAUTION! ⌧
T
CAUTION!
Corrosive system water
requires corrosion resistant fittings and
hoses, and may require water treatment.
Hose Diameter Minimum Bend Radii
1/2"
3/4"
1"
1-1/4"
⌧ CAUTION! ⌧
T
CAUTION!
Do not bend or kink supply
lines or hoses.
2-1/2"
4"
5-1/2"
6-3/4"