Burnham 805B, Installation, Operating And Servicing Instructions, Page: 28 / 100

28
Figure 20: Safety Relief Valve Installation
Figure 21: Drain Piping Installation
D.
Install Drain Valve in rear of Left End Section, Tapping
"G". See Figure 21. Components are located in Water
Trim Carton.
E.
Install Temperature-Pressure Gauge . Components are
located in Water Trim Carton.
1. Standard Temperature - Pressure Gauge Piping. See
Figure 22.
a. Install 2" NPT x 10" lg. nipple with gauge tapping
into Supply Tapping "A". See Figure 3. Gauge
tapping should face forward.
b. Insert Temperature-Pressure Gauge. Tighten by
applying pressure to square shank on back of
gauge. DO NOT APPLY PRESSURE ON GAUGE
CASE since this may ruin gauge calibration.
2. Alternate Temperature-Pressure Gauge Piping. See
Figure 23.
a. Install 2 NPT x 10" Nipple into Supply Tapping
"A". See Figure 3.
b. Install 2 NPT x ¾ NPT x 2 NPT Tee (provided) or
2 NPT x 2 NPT x ¾ NPT Tee (installer furnished).
¾" NPT leg should face forward.
c. Install ¾ NPT x ¼ NPT Bushing.
d. Insert Temperature-Pressure Gauge. Tighten by
applying pressure to square shank on back of
gauge. DO NOT APPLY PRESSURE ON GAUGE
CASE since this may ruin gauge calibration.
F.
Connect system supply and return piping to boiler. See
Figure 25. Also consult I=B=R Installation and Piping
Guides. Maintain minimum ½ inch clearance from hot
water piping to combustible materials.
1. If boiler is used in connection with refrigeration
systems, boiler must be installed with chilled medium
piped in parallel with heating boiler using
appropriate valves to prevent chilled medium from
entering boiler. See Figure 24. Also consult I=B=R
Installation and Piping Guides.
2. If boiler is connected to heating coils located in air
handling units where they may be exposed to
refrigerated air, boiler piping must be equipped with
flow control valves to prevent gravity circulation of
boiler water during cooling system operation.
3. Use boiler bypass if boiler is operated in system
which has a large volume or excessive radiation
where low boiler water temperatures may be
encountered (i.e. converted gravity circulation
system, etc.). See Figure 25.
4. A hot water boiler installed above radiation level
must be provided with a low water cutoff device as
part of installation.
5. A start-up strainer is recommended for practically all
modular installations (new and replacement alike) to
prevent system debris and sediment from ending up
in the boilers where it will inhibit heat transfer and
may eventually cause a cast iron section to crack
from overheating.
G.
Alliance Water Heater (if used). Refer to Alliance
Installation, Operating and Service Instructions for
additional information. Install in same manner as space
heating zone.