ACCESSORY INSTALLATIONS
41
N.O. YL13
N.C. BU21
B
A
Motor
Wire Nuts
Return To
Water System
From
Heat
Coil
Control Cord/Plug
*
*
Connect YL13 for Normally Open Valves.
Connect BU21 for Normally Closed Valves
20. Before soldering pipes to normally closed valves, manu-
ally open valve by slowly moving lever to retaining notch
and allow spring to secure lever in notch. The lever will
reset to the automatic position the first time the valve is
energized.
Three-Way Valve Installation
When installing three-way diverting valves, end “B” is
the supply to coil and end “A” is the by-pass end. The
inlet port is unmarked. Port markings “A” and “B” are
located on the bottom of the valve body.
N.O. YL13
N.C. BU21
B
A
Motor
Wire Nuts
Control Cord/Plug
End "B"
To Coil
(Normally
Closed)
Coil Assembly
Return
*
* Connect YL13 for Normally Open Valves.
Connect BU21 for Normally Closed Valves.
Prior to soldering the normally closed 3-way valve, open
both ports by slowly moving manual operating lever to
retaining notch until lever is secured by valve spring.
Flow valve and tubing is to be installed so that it does
not restrict removal of the chassis from the sleeve for
service.
21. Solder the flow valve and other necessary components
in line with the plumbing rising from the floor or wall.
The components should not be placed inside the hy-
dronic top assembly.
22. The plumbing may enter from the left and/or right side of
the unit through the slots and holes that are supplied in
the hydronic top assembly. (See Plumbing Dimensions)
23. Hydronic water kits (HWK03) may have water entering
either the left or right side of the coil. Hydronic steam
kits (HVK03) can only have entering steam on the right
side of the coil. (See Plumbing Dimensions)
24. Make sure all piping is plumbed to the coil and system
has been bled of air. Using the existing six screws and
hydronic top from Step 13, place the top cover over the
coil deck assembly. Make sure the back flange of the
top cover fits inside the small vertical flange in the back
of the coil assembly.
Flange
Water
Piping
NOTE:
A manual bleed valve is supplied with both the
Hydronic Water Kit and the Hydronic Steam Kit (HWK03
and HVK03). It is recommended that the installer in-
stall an automatic bleed valve for Hydronic Steam Kits
(HVK03) to eliminate frequent access to the manual
bleed valve for purging air from the steam system.
25. Place the hydronic front on the top assembly so the
flanges of the front fit tightly into the flanges of the top
assembly.
26. Check to ensure the inlet air filter is located inside of the
inlet grille between the inlet grille and the coil. The inlet
grille can be hinged open by unlatching the two top le-
vers on the grille.
27. Attach the supplied ball knob to the control door using
the #10 machine screw supplied with the kit.
Summary of Contents for R-22
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