Thermo Pride Gas/Propane Furnace Premiere Series 2-Stage CHX3 - Manual (Page 30)

All installations and services must be performed by qualified service personnel.
24
2. Determine on which side of furnace the condensate disposal line is to be run (NOTICE: On
CHX3/CDX3’s this must be the same side as the flue outlet or bottom of unit). Attach the condensate
trap to the furnace casing using the #8x3/4” sheet metal screws provided in the parts package. Pilot
holes are provided on both sides of the casing for mounting.
NOTE: When the CDX3 series unit is used in a horizontal application, the drain hose from the
collector box will require a location change from it's factory shipped connection. A knockout has
been provided in the unit side casing for the drain hose to exit. The connection change can be
accomplished as follows: Refer to Figure 16.
a) Locate and disconnect the drain hose at the collector box from its factory shipped connection
location.
b) Locate and uncap the drain at the bottom (as it is oriented) of the collector box.
c) Connect the drain hose from step a to the uncapped bottom drain from step b.
d) Cap the previous drain connection from step a with the existing cap removed in step b.
3. Attach the drain hose (11/16” diameter clear tubing) from the front (CHX3) or bottom (CDX3) of the
condensing coil cover plate to one side of the PVC tee provided in the trap assembly. Secure the
drain hose (11/16” o.d. tubing) with the silver clamp provided in the parts package. Be careful to route
the tubing through the proper hole in the furnace casing using the Heyco bushing provided. While
making all connections with the clear tubing, be careful to route the tubing in a manner to prevent
kinking or abrasion of the tubing.
4. Measure the drain hose (11/16” o.d. clear tubing) provided and remove any extra length, making sure
that the hose has sufficient length not to kink or otherwise be restricted once installed. Attach the
drain hose (11/16” o.d. clear tubing) to the other side of the condensate trap tee. On CHX3/CDX3’s,
this hose is shipped in the parts package and it will be necessary to attach the other end to the PVC
drain tee assembly (see Figure 15). Use the silver clamp(s) provided in the parts package to secure
all connections.
5. Install field supplied 1/2” CPVC drain pipe and elbows using CPVC cement to reach a nearby drain. A
minimum 1/4” per foot downward slope toward the drain must be maintained. The drain line must be
water tight, supported and secured so that it can’t be moved. The length of the drain must be kept as
short as possible.
IMPORTANT: If an air conditioning condensate drain line is combined with the furnace condensate drain
line, it must have a separate trap ahead of the joint connection.
6. If a drain is not readily available or is above the trap outlet level on the furnace or the drain line cannot
be sloped downward its full length to the drain, then a condensate pump (part #350225) can be
ordered from the factory. Follow the pump manufacturers installation instructions.
7. The furnace condensate is slightly acidic with a pH of 3.5. Cola drinks with a pH of 3.1 are actually
more acidic. If local codes require a neutralizing kit, the kit may be ordered using part no. 320095.
Instructions included with the neutralizing kit must be followed for its proper installation.
8. The condensate piping in the furnace and the drain system must be flushed out at the start of every
heating season. This will assure trouble free operation and will keep the acidity level well above 3.4
pH.
To flush the condensate drain system, turn off power to the furnace at the electrical disconnect switch and
turn the thermostat to the lowest setting.