Lochinvar 751 - 2001 사용자 설명서

Installation & Operation Manual

Crest boilers may be common vented; however, the following 
criteria MUST BE followed:

1.  Only Crest boilers may be connected to common flue 
 

applications.  DO NOT mix other manufacturer’s 

 

appliances or other Lochinvar models.  Common air 

 

intake is not allowed.

2.  Crest boilers connected to the common vent must all be 
 

of the same size.

3.  Each Crest boiler must have a Lochinvar supplied flue 
 

damper installed (see Table 2D).

4.  Only vertical direct vent, positive pressure, Category 
 

IV or vertical/chimney vent, negative pressure, Category 

 

II may be used when common venting Crest boilers.  

 

Sidewall venting is not allowed.

5.  Crest boilers in a common vent must be connected and 
 

controlled with the integral Crest SMART TOUCH 

 Cascade.

 
 

a.  The Leader may be controlled through the Crest 

 

 

SMART TOUCH control through BMS (external 

 

 

0 - 10V signal), ModBus or its own internally 

  calculated 

set 

point.

 

b.  The Cascade (Members) must be controlled by the 

 

 

Crest Leader boiler using the Lead/Lag Cascade 

  option.

 
For approved common vent sizing, contact the factory.

 WARNING

When Crest boilers are common vented, 
the criteria above MUST BE followed. 
Failure to follow all these requirements 
will result in severe personal injury, death, 
or substantial property damage.

FB0751

6"

100056142

FB1001

6"

100056142

FB1251

8"

100141561

FB1501

8"

100141561

FB1751

8"

100141561

FB2001

8"

100141561

When Crest boilers are common vented, 
hot water generators MUST BE piped 
to the primary heating loop and tank 
thermostats must not be connected to the 
Crest.

Use only cleaners, primers, and solvents 
that are approved for the materials which 
are joined together.

All PVC vent pipes must be glued, properly 
supported, and the exhaust must be 
pitched a minimum of a 1/4 inch per foot 
back to the boiler (to allow drainage of 
condensate).

 WARNING The vent connection to the appliance 

must be made with the starter CPVC pipe 
section provided with the appliance if 
PVC/CPVC vent is to be used.  The field 
provided vent fittings must be cemented 
to the CPVC pipe section using an “All 
Purpose Cement” suitable for PVC and 
CPVC pipe.  Use only the vent materials, 
primer, and cement specified in Table 2E 
to make the vent connections.  Failure to 
follow this warning could result in fire, 
personal injury, or death.

 WARNING

Insulation should not be used on PVC 
or CPVC venting materials.  The use of 
insulation will cause increased vent wall 
temperatures, which could result in vent 
pipe failure.

This product has been approved for use with the PVC/CPVC 
vent materials listed in Table 2E on page 20.

Factory installed vent connections are sized 
for stainless steel venting.

A field supplied inline condensate 
collection section MUST BE installed 
directly above the backflow preventer.

When using polypropylene common 
vent a field supplied polypropylene to 
stainless steel adapter MUST BE installed 
between the backflow preventer and the 
unit connection.