Modulation Controls (P Models Only); Blower Packs - Nortec GH Series Instaliation, User & Maintenance Manual

B - Duct Mounted Safety High Limit On/Off
Humidistat (if used): Wired to make on drop in
humidity, break on rise to safety setpoint. Set to
approximately 85% RH as a safety to help prevent
saturation and wetting in the duct.
C - Duct Mounted Safety Air-Proving On/Off
Switch (if used): Wired to make when sensing air flow;
break when no air flow. Used as a safety to prevent
saturation when no air flow.
1. NORTEC offers various versions of A, Band
C to suit each application. In general, A is
essential, whereas Band C are highly
recommended in ducted applications.
2. Field wiring from humidistat to humidifier and
between devices should be 18 AWG or
heavier and kept as short as possible.
3. Low voltage control terminal strips are
provided in the electrical compartment.
Internal sides are factory wired. External
sides are to be field wired.
4. Each humidifier is supplied with a wiring
diagram.
MODULATION CONTROLS
(P Models Only)
For P Models a single 0-10 VDC or 0-20 mA
control signal is received at terminals 4 and 5 on the
low voltage terminal strip to generate a modulating
output from the humidifier. Terminals 1 and 3 are 24
Vac output and ground respectively and may be used
to power a remote mounted modulating humidistat.
NORTEC recommends that the safety loop across
terminal 1 and 2 be utilized for safe operation of the
humidifier (see B
&
C under on/off controls). For
control wiring connections of GHMC models see MC
Manual, Form # 98-274.
BLOWER PACKS
1. Blower packs are an optional accessory used
to directly distribute steam to localized areas
(such as computer rooms) or in structures that
do not have a built-in air distribution system.
2. Blower packs are remote mounted (RMBP)
see Figure #5.
3. All GH Series blower packs consist of a steel
cabinet containing: fan and motor powered by
external 208-240 voltage (optional 11 0-120 V
available), fuse, relay, speed select switch,
stainless steel steam distributor, supply air
- 7 -
Figure #5
230"
(~tJI (~4=)1 ~I
/ \
p~er
Condensate Steam
o
o
o
Dimensions Shown
Are Steam Une Connections
Allow Minimum 12" (31 cm)
Clearance On Each Side
(
19
:t:'
0 0 0
~72"_~
(18.2cm)
grille with adjustable louvers, and built-in
resettable safety thermostat which turns off
the humidifier if the blower pack gets
overheated. Control thermostat, mounted on
the steam distributor, starts the fan when
steam is generated. All blower packs provide
intake air filters.
4. Refer to Figure #6 for overhead and frontal
clearances required for blower packs.
Minimum clearance for the sides is 12 inches.
5. Mount remote blower pack(s) using factory
supplied wall mounting brackets, See Figure
#5, with clearance as recommended in Figure
#6.
Figure #6
Overhead & Frontal Clearances for Blower Packs
GH
Min. No. of Min. Overhead Min. Front
Model Blower Clearance Clearance
Packs inches (cm) inches (cm)
100 1* 48 (122) 156 (396)
200 2* 48 (122) 156 (396)
400 4* 48 (122) 156 (396)
*
Remote mounted only. Two remote mounted blower
packs are recommended on the 100 model, three are
recommended for the 200 model, six are
recommended for the 400 model.
Nominal conditions 72°F, 35% RH.
6. Steam distributors in the remote blower packs
have a hot surface that could result in burns if
touched. If space allows, we recommend
mounting remote blower pack at least 8 feet
above the floor.
7. Do not use blower packs as ducted blowers.
The air volume from a blower pack is not
sufficient to absorb the steam generated.