Common Venting; Outdoor Installation - Raypak XTherm 1005A Installation And Operation Manual

3.20. Common Venting

Raypak does not support common venting of any product
under positive vent pressure. Use a variable-speed
extractor to draw the common stack to negative pressure
(cat II) as shown in Figure 40.

3.21. Outdoor Installation

XTherm heaters are certified for outdoor operation
in non-freezing conditions only. Freezing conditions
may cause condensate to freeze in the condensate
drain line and trap, causing the unit to shut down
from a blocked condensate drain. Take appropriate
measures. Additionally, components of the condensate
management system may be damaged by the ice
formation. Units installed in freezing climates for
seasonal use must be winterized to avoid freeze damage
to the heater.
Outdoor models must be vented with listed vent material
per the following instructions and installed with the
optional factory-supplied outdoor vent kit. A special vent
cap is provided in accordance with CSA requirements. It
must be installed directly on the vent pipe as illustrated
in Figure 41.
Care must be taken when locating the heater outdoors,
because the flue gases discharged from the vent cap
can condense as they leave the cap. Improper location
can result in damage to adjacent structures or building
finish. For maximum efficiency and safety, the following
precautions must be observed:
VENT DRAIN - USE TEFLON
TUBING (RUN TO NEUTRALIZER
OR CONDENSATE PUMP)
EXTRACTOR'S
PRESSURE
SET POINT
-0.01 TO - 0.07
F10021
1. Outdoor models must be installed outdoors and
2. Periodically check venting system. The heater's
3. Do not locate adjacent to any window, door, walkway,
4. Install above grade level and above normal snow
5. Vent terminal must be at least 3' (1 m) above any
6. Adjacent brick or masonry surfaces must be
Figure 40. Typical Common Venting Installation
must use the outdoor vent cap available from the
manufacturer (sales order option D-11).
venting areas must never be obstructed in any way
and minimum clearances must be observed to
prevent restriction of combustion and ventilation
air. Keep area clear and free of combustible and
flammable materials.
or gravity air intake. The vent must be located a
minimum of 4' (1.2 m) horizontally from such areas.
levels.
forced air inlet located within 10' (3 m) .
protected with a rust-resistant sheet-metal plate.
NOTE: The vent cap must be furnished by the heater
manufacturer in accordance with its listing (sales order
option D-11).
NOTE: Condensate can freeze on the vent cap. Frozen
condensate on the vent cap can result in a blocked flue
condition and non-warrantable failure. Condensate is
acidic and highly corrosive. Condensate must not be
allowed to freeze. Take appropriate measures.
SLOPE TOWARD
COMMON VENT PIPE
APPLIANCE
1"-4" MINIMUM
VARIABLE-SPEED
EXTRACTOR FAN
REQUIRED
CAT II
ALT. LOCATION
VARIABLE SPEED
EXTRACTOR
VENT PIPE SAME DIAMETER
AS BOILER VENT
(CAT IV)
BOOT TEE
VENT DRAIN - USE TEFLON
TUBING (RUN TO NEUTRALIZER
OR CONDENSATE PUMP)
35