Roberts Gorden Corayvac CRV-B Series, Installation, Operation & Service Manual

Page: 72 / 96

CRV-S
ERIES
I
NSTALLATION
, O
PERATION AND
S
ERVICE
M
ANUAL
64 of 85
4. If any abnormal operation occ u rs, see the tro u -
bleshooting section of the ser v ice instr u ctions.
13.4 Settin g the Vacuum
1. Set temperat u re setpoints abo v e room tempera-
t u re. See that all b u rners are operating properly.
2. Allo w at least ½ ho u r operation for temperat u re
to normalize, then check system v ac uu m bal-
ance. Vac uu m can be meas u red by inserting a
manometer hose into the end v ent as sho w n on
Page 65, Figure 48 . Normal end v ent v ac uu m
sho u ld be set at approximately 2.5'' w c to 3.0'' w c
(hot).
Vac
uu m adj u stments are made by means of the
damper in the p u mp inlet and the adj u stable
damper co u pling(s) in the system. Check the
v ac uu m at all end v ents and then adj u st the
damper co u pling to obtain eq u al v ac uu m
readings of 2.5'' w c to 3.0'' w c. If end v ent
v ac uu m exceeds 3.0" w c, adj u st the p u mp inlet
damper u ntil v ac uu m readings are 2.5'' w c to
3.0'' w c.
With systems designed to operate at maxim u m
v ac uu m, it may not be possible to obtain
v ac uu m differential readings at or slightly abo v e
2.5'' w c. If so, adj u st the damper co u plings to
maxim u m b u t eq u al v ac uu m reading. Be s u re to
lock all dampers sec u rely after adj u stment.
3. Reset temperat u re setpoints to desired room
temperat u re.
4. If heat is not req u ired, t u rn off main s w itch and
close the main gas v al v e.