12
LEAK TESTING
After securing the connections, test the system for any leaks.
Always test hydronic systems with water as some components
are not designed to be inert gas pressurized.
Field pressure testing for leaks should not exceed 300 psi for
hydronic coil and valve package components. Consult factory
if higher limits are required.
REFRIGERANT COIL TESTING
Test refrigerant systems with dry nitrogen rather than air to
prevent the introduction of moisture into the system. In the
event that leaking or defective components are discovered, no-
tify the Sales Representative BEFORE any repairs are attempt-
ed. All leaks must be repaired before proceeding with the in-
stallation. In DX systems, adequate freeze protection should be
field-installed.
PIPING INSULATION
After system integrity has been established, insulate the piping
in accordance with the project specifications. This is the re-
sponsibility of the installing or insulation contractor.
CONDENSATE DRAIN
Any fan coil unit with a drain pan is recommended to be
equipped with a drain trap to provide condensate drainage and
prevent property damage.
The drain U-trap should be deep enough to offset maximum
unit static pressure difference as shown at Fig. 18, to prevent
condensate flowing back to drain pan.
Fig. 18 — Condensate Drain U-Trap
CONDENSATE FLOAT SWITCH
The condensate float switch is used to detect clogged or re-
stricted condensate pan drains. The condensate switch uses a
Normally Closed contact to allow the system control power to
pass through the switch energizing the water valves and fans
allowing normal operation. When an overflow condition is de-
tected by the switch, it opens the NC contacts and de-energizes
the water valves and fans.
Step 4 — Make Electrical Connections
The unit serial plate lists the unit electrical characteristics in-
cluding the required supply voltage, fan and heater amperage
and required circuit ampacity (See Fig. 19). The unit wiring di-
agram displays all unit and field wiring. Every project is differ-
ent and each unit on a project may be different, the installer
must be familiar with the wiring diagram and serial plate on the
unit BEFORE beginning any wiring.
Fig. 19 — Serial Plate Example
Ensure all field electrical connections are in accordance with unit
wiring diagram and all applicable national and local code. The
type and size of all wiring and other electrical components includ-
ing circuit breakers, disconnect switches, etc. shall be determined
by the individual job requirements. Verify conductor size is suit-
able for the distance to the equipment connection and will support
the equipment electrical load. All installations including field wir-
ing shall be made in compliance with all governing codes and or-
dinances. Compliance with all codes is the responsibility of the in-
stalling contractor.
All components furnished for field installation by either the facto-
ry or the controls contractor shall be located and checked for prop-
er function and compatibility. Inspect all internal components for
shipping damage. Inspect all electrical connections within the unit
control box and accessories and tighten if necessary.
NOTE: All field wiring must be in accordance with governing
codes and ordinances. Any modification of unit wiring without
factory authorization will invalidate all factory warranties and nul-
lify any agency listings. The manufacturer assumes no responsi-
bility for any damages and/or injuries resulting from improper
field installation and/or wiring.
CABINET/CONTROL BOX MAINTENANCE LIGHT
Optional Service Light provides a source of illumination in the
main unit cabinet and the control box during routine mainte-
nance and troubleshooting in the dark ceiling spaces. Light
turns "ON" when access panel or control box door is open, but
unit is not powered. (See Fig. 20.)
Step 5 — Connect Ductwork
All ductwork shall be installed in accordance with the project
plans and specifications. See Fig. 16 and 17 for supply and re-
turn duct flanges location and dimensions.
NOTE: When installing units that attach to branch duct piping,
use industry approved duct standards and configuration such as
those published by Air Conditioning Contractors of America
(ACCA) or American Society of Heating, Refrigeration and
Air Conditioning Engineers (ASHRAE). The standards pro-
vide necessary information on sizing, layout and installing sup-
ply and return air duct systems.
Flexible duct connections should be used on all air handling
equipment. All ductwork and insulation shall be installed to al-
low proper access to all components for service and repair such
as filters, motor/blower assemblies, etc.
CAUTION
Protect all water coils from freezing after initial filling with
water. Even if the system is drained, unit coils may still hold
enough water to cause damage when exposed to tempera-
tures below freezing.
DRAIN PAN
SAFETY MARGIN
TSP
TSP
TO DRAIN
Max Water Coil Leaving Air or Max Motor AMB:
Max Fuse or Max Circ Breaker (HACR Type NEC):
Unit Intended for Indoor Use Only & Suited For 0.00 Clearance From Combustible Surfaces
-
25A - SCCR: 5KA
Unit Serial No:
Model No:
42DHA20
776004-60-1
ELECTRICAL
ENV/PERF
Motor(s):
Motor VPH:
Motor FLA:
Heater AMPS:
QTY of Motor(s):
Motor HP:
Min Circ Amps:
Heater VPH:
E020-71537402
277/1/60
5.10A
18.1A
5.0 kW
1
1 HP
29.0A
277/1/60
Max ESP:
Max Inlet Water Temp:
Coil Test:
High Side Coil Design:
Refrigerant Type:
1.65
300 PSIG
-
-
Max Outlet Air Temp:
Max Hot Water or Steam:
ARI Model:
Low Side Coil Design:
-
42DHA20
-
190F
2 PSIG
Heater Kw:
Motor Current:
5.10A
Manufactured in the USA
